WO2018055666A1 - インターフェース回路 - Google Patents
インターフェース回路 Download PDFInfo
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- WO2018055666A1 WO2018055666A1 PCT/JP2016/077661 JP2016077661W WO2018055666A1 WO 2018055666 A1 WO2018055666 A1 WO 2018055666A1 JP 2016077661 W JP2016077661 W JP 2016077661W WO 2018055666 A1 WO2018055666 A1 WO 2018055666A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
- H03K19/018507—Interface arrangements
- H03K19/018521—Interface arrangements of complementary type, e.g. CMOS
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
Definitions
- the present invention relates to an interface circuit that converts an input signal into another signal level and outputs the signal.
- a control signal generated by a digital IC (Integrated Circuit) operating at 3.3 V such as a microcomputer or FPGA (Field Programmable Gate Array) may be supplied to a controlled element such as a high voltage element or a high frequency element.
- a controlled element such as a high voltage element or a high frequency element.
- the level of the control signal needs to be converted to a high voltage such as several tens of volts or a negative voltage and then supplied to the controlled element. Therefore, an interface circuit including a so-called level conversion circuit is used.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2007-101740
- Patent Document 2 Japanese Patent Application Laid-Open No. 2011-19017
- Patent Document 3 Japanese Patent Application Laid-Open No. 1-152817
- Patent Document 4 Japanese Patent Application Laid-Open No. 2011-103557
- JP-A-2011-176767 Patent Document 5 discloses various level conversion circuits.
- JP 2007-101740 A JP 2011-19017 A Japanese Patent Laid-Open No. 1-152817 JP 2011-103557 A JP 2011-176767 A
- digital ICs are supplied with power having a high potential side of 3.3 V and a low potential side of 0 V (ground potential: hereinafter referred to as GND potential).
- GND potential ground potential: hereinafter referred to as GND potential.
- the digital IC outputs a high active control signal in which the high level is 3.3 V and the low level is a GND potential corresponding to inactive (inactive).
- the digital IC outputs a low active control signal in which the high level is a GND potential corresponding to inactive and the low level is ⁇ 3.3V.
- a potential on the side that is not a reference potential (for example, GND potential) corresponding to inactive in the received control signal is active (significant). And operates when the control signal is in an active state.
- the controlled elements are also mostly operated by a control signal whose high level is active (high active). However, there is also a controlled element that is operated by a control signal whose low level is active (low active).
- the reference potential corresponding to inactive is the GND potential
- the high level is a positive potential in high active
- the low level is a negative potential in low active.
- an interface circuit that receives a control signal from a digital IC and outputs a control signal for controlling a controlled element is appropriately designed in consideration of whether the control signal is high active or low active. There is a need.
- an interface circuit between a digital IC that outputs a high-active control signal having a high level of 3.3 V and a low level of GND potential and a controlled element that operates according to the high-active control signal is a digital circuit.
- a circuit that outputs a signal in phase with the control signal input from the IC to the controlled element is selected.
- a digital IC As an interface circuit between a digital IC that outputs a low-active control signal whose high level is the GND potential and low level is ⁇ 3.3 V, and a controlled element that operates according to the high-active control signal, a digital IC A circuit that outputs a signal whose polarity is inverted with respect to the control signal input from is output to the controlled element.
- a circuit is selected that outputs to the controlled element a signal whose polarity is inverted with respect to the control signal input from the digital IC.
- a digital IC As an interface circuit between a digital IC that outputs a low active control signal whose high level is the GND potential and low level is ⁇ 3.3 V, and a controlled element that operates according to the low active control signal, a digital IC A circuit that outputs a signal having the same phase as the control signal input to the controlled element is selected.
- the present invention has been made to solve the above-described problem, and an object of the present invention is to provide an interface circuit capable of outputting a desired signal regardless of whether the input signal is high active or low active.
- the interface circuit of the present invention receives a first signal that sets a first potential to a high level and a second potential lower than the first potential to a low level, sets a third potential to a high level, Is a circuit that outputs a second signal that sets a fourth potential lower than the first potential to a low level, and includes a control unit.
- the control unit sets the second signal in phase with the first signal or sets the polarity of the second signal according to which of the first potential and the second potential is the first reference potential. Controls whether to invert the first signal.
- a desired signal can be output regardless of whether the input signal is high active or low active.
- FIG. 6 is a circuit block diagram showing a configuration of an interface circuit according to Comparative Example 1.
- FIG. 10 is a circuit block diagram showing a configuration of an interface circuit according to Comparative Example 2.
- FIG. 3 is a circuit block diagram illustrating a configuration of an interface circuit according to the first embodiment when a signal having a high level as a positive potential and a low level as a GND potential is received as an input signal VIN.
- FIG. 3 is a circuit block diagram showing a configuration of an interface circuit according to the first embodiment when a signal having a high level of GND potential and a low level of negative potential is received as an input signal VIN.
- FIG. 3 is a circuit diagram illustrating an example of an interface circuit according to the first embodiment.
- FIG. 6 is a signal waveform diagram showing a change in potential state of each terminal in the interface circuit shown in FIG. 5.
- FIG. 6 is a circuit block diagram showing a configuration of an interface circuit according to a second embodiment when a signal having a high level as a positive potential and a low level as a GND potential is received as an input signal VIN.
- FIG. 9 is a circuit block diagram illustrating a configuration of an interface circuit according to a second embodiment when a signal having a high level of GND potential and a low level of negative potential is received as an input signal VIN.
- FIG. 6 is a circuit diagram showing an example of an interface circuit according to the second embodiment.
- FIG. 10 is a signal waveform diagram showing a change in potential state of each terminal in the interface circuit shown in FIG. 9.
- FIG. 10 is a signal waveform diagram showing a change in potential state of each terminal in the interface circuit shown in FIG. 9.
- FIG. 10 is a circuit block diagram illustrating a configuration of an interface circuit according to a third embodiment when a signal having a high level as a positive potential and a low level as a GND potential is received as an input signal VIN.
- FIG. 9 is a circuit block diagram showing a configuration of an interface circuit according to a third embodiment when a signal having a high level of GND potential and a low level of negative potential is received as an input signal VIN.
- FIG. 10 is a circuit diagram showing an example of an interface circuit according to the third embodiment.
- FIG. 9 is a circuit block diagram showing a configuration of an interface circuit according to a fourth embodiment when a signal having a high level as a positive potential and a low level as a GND potential is received as an input signal VIN.
- FIG. 9 is a circuit block diagram showing a configuration of an interface circuit according to a fourth embodiment when a signal having a high level as a positive potential and a low level as a GND potential is received as an input signal VIN.
- FIG. 9 is a circuit block diagram illustrating a configuration of an interface circuit according to a fourth embodiment when a signal having a high level of GND potential and a low level of negative potential is received as an input signal VIN.
- FIG. 10 is a circuit diagram showing an example of an interface circuit according to the fourth embodiment. It is a figure which shows another circuit structure of a level shift part.
- the signal a being in phase with the signal b means that the signal b is also at a high level when the signal a is at a high level, and the signal b is also at a low level when the signal a is at a low level.
- the polarity of the signal a is inverted with respect to the signal b means that the signal b is at a low level when the signal a is at a high level, and the signal b is at a high level when the signal a is at a low level.
- FIG. 1 is a circuit block diagram showing a configuration of the interface circuit 100a according to the first comparative example.
- the interface circuit 100a receives an input signal VIN that sets the high potential VIH to the high level and the low potential VIL to the low level, and outputs an output signal VOUT that sets the high potential VOH to the high level and the low potential VOL to the low level. It is.
- the interface circuit 100 a includes an input buffer 101, a level shift unit 4, and an output buffer 5.
- the input buffer 101 receives the high potential VIH and the low potential VIL from the input side power supply, and outputs the signal S1 of the high potential VIH to the level shift unit 4 when the input signal VIN is at the high level, and the input signal VIN is at the low level. At the level, the signal S1 of the low potential VIL is output to the level shift unit 4. Thus, the input buffer 101 outputs the signal S1 having the same phase as the input signal VIN.
- the level shift unit 4 is supplied with the high potential VIH and the low potential VIL from the input side power supply, and is supplied with the high potential VOH and the low potential VOL from the output side power supply.
- the level shift unit 4 receives the signal S1 output from the input buffer 101, and outputs a signal S2 that is in phase with the signal S1 and in which the level of the signal S1 is converted.
- the level shift unit 4 may be supplied with only the high potential VIH from the input-side power supply.
- the level shift unit 4 outputs a signal S2 having a high potential VOH when the signal S1 received from the input buffer 101 is at a high level, and a signal having a low potential VOL when the signal S1 is at a low level. S2 is output.
- the level shift unit 4 outputs the signal S2 having the same phase as the signal S1 output from the input buffer 101. That is, the level shift unit 4 outputs the signal S2 that is in phase with the input signal VIN and whose level is converted.
- the output buffer 5 receives the signal S2 output from the level shift unit 4 and outputs a signal in phase with the signal S2 as the output signal VOUT. That is, the output buffer 5 outputs a signal in phase with the input signal VIN as the output signal VOUT.
- the output buffer 5 amplifies the current of the output signal VOUT so that the output current becomes a current necessary for driving the load.
- the interface circuit 100a outputs the output signal VOUT in phase with the input signal VIN. Therefore, the interface circuit 100a receives, for example, a high active signal whose high level is 3.3V and a low level is a GND potential corresponding to inactive from the digital IC as an input signal VIN, and receives a high active control signal. It is suitable for a circuit that outputs an output signal VOUT to a controlled element that operates.
- the interface circuit 100a receives a low active signal with a high level corresponding to inactive GND and a low level of ⁇ 3.3V from the digital IC as the input signal VIN, the input signal VIN is When the GND potential corresponds to active, the high level output signal VOUT is output. Therefore, the interface circuit 100a is not suitable for a circuit that receives a low-active signal as the input signal VIN and outputs the output signal VOUT to a controlled element that operates according to a high-active control signal.
- FIG. 2 is a circuit block diagram illustrating a configuration of the interface circuit 100b according to the second comparative example.
- the interface circuit 100b is different from the interface circuit 100a shown in FIG. 1 in that an input inverter 102 is provided instead of the input buffer 101.
- the input inverter 102 receives the high potential VIH and the low potential VIL from the input side power supply, and when the input signal VIN is at the high level, outputs the signal S1 of the low potential VIL to the level shift unit 4 and the input signal VIN is at the low level. At the level, the signal S1 of the high potential VIH is output to the level shift unit 4. In this way, the input inverter 102 outputs the signal S1 whose polarity is inverted with respect to the input signal VIN.
- the level shift unit 4 outputs the signal S2 having the same phase as the signal S1 received from the previous stage.
- the output buffer 5 outputs an output signal VOUT in phase with the signal S2 received from the previous stage. Therefore, the interface circuit 100b outputs the output signal VOUT whose polarity is inverted with respect to the input signal VIN.
- the interface circuit 100a receives, for example, a low active control signal whose high level is a GND potential corresponding to inactive and whose low level is ⁇ 3.3V from the digital IC as the input signal VIN. It is suitable for a circuit that outputs an output signal VOUT to a controlled element that operates according to a control signal.
- the interface circuit 100b receives from the digital IC as the input signal VIN a high active signal whose high level is 3.3 V and the low level is a GND potential corresponding to inactive, the input signal VIN is inactive. A high level output signal VOUT is output at a GND potential corresponding to. Therefore, the interface circuit 100a is not suitable for a circuit that receives a high-active signal as the input signal VIN and outputs the output signal VOUT to a controlled element that operates according to the high-active control signal.
- the user operates as an interface circuit that outputs the output signal VOUT to the controlled element operated by the high active control signal, depending on whether the input signal VIN is high active or low active ( That is, it is necessary to use the interface circuit 100a and the interface circuit 100b properly depending on which of the high level and the low level of the input signal VIN is a reference potential corresponding to inactive (for example, GND potential).
- the interface circuit according to the embodiment of the present invention can be used regardless of whether the input signal VIN is high active or low active.
- the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.
- FIG. (Configuration of interface circuit) 3 and 4 are circuit block diagrams showing the configuration of the interface circuit 10a according to the first embodiment.
- a high-active signal in which a high level (high potential VIH) is a positive potential and a low level (low potential VIL) is a reference potential (here, GND potential) corresponding to inactivity is used as an input signal VIN.
- VIN high level
- VIL low level
- FIG. 4 shows a case where a low active signal whose high level is a reference potential corresponding to inactive (here, GND potential) and whose low level is a negative potential is received as the input signal VIN.
- the configuration of the interface circuit 10a itself is the same in FIGS.
- the interface circuit 10a is a circuit that outputs a high active output signal VOUT regardless of which of the high level and low level of the input signal VIN is the GND potential. Therefore, the interface circuit 10a can be applied to a circuit that outputs the output signal VOUT to a controlled element that operates according to a high-active control signal.
- the interface circuit 10a is different from the interface circuit 100a shown in FIG. 1 or the interface circuit 100b shown in FIG. 2 in place of the input buffer 101 or the input inverter 102. It differs in that it is equipped with.
- the polarity control unit 1a inputs a signal S1 to be output depending on whether the GND potential (first reference potential) corresponding to inactive corresponds to the high level or the low level of the input signal VIN. It controls whether the signal VIN is in phase or the polarity of the output signal S1 is inverted with respect to the input signal VIN. Specifically, when the GND potential corresponds to the low level of the input signal VIN, the polarity control unit 1a makes the output signal S1 in phase with the input signal VIN, and the GND potential corresponds to the high level of the input signal VIN. The polarity of the output signal S1 is inverted with respect to the level of the input signal VIN.
- the polarity control unit 1a includes, for example, a voltage detection unit 2a and a switching unit 3a as its internal configuration.
- the voltage detection unit 2a receives a GND potential which is a reference potential corresponding to inactive, and also receives a high potential VIH from the input-side power source, and compares both potentials. When the difference between the high potential VIH and the GND potential is smaller than the threshold value, the voltage detection unit 2a outputs a detection signal indicating that the high potential VIH is the GND potential to the switching unit 3a, and the high potential VIH and the GND potential Is equal to or greater than the threshold value, a detection signal indicating that the low potential VIL is the GND potential is output to the switching unit 3a.
- the switching unit 3a receives the input signal VIN and switches whether the signal S1 is in phase with the input signal VIN or is inverted according to the detection signal from the voltage detection unit 2a.
- the switching unit 3a when the detection signal indicates that the low potential VIL is the GND potential, the switching unit 3a outputs the signal S1 having the same phase as the input signal VIN to the level shift unit 4, and the high potential VIH is set to the GND potential. In the case where the detection signal indicates that, the signal S1 having the polarity reversed with respect to the input signal VIN is output to the level shift unit 4.
- the switching unit 3a receives the high potential VIH and the low potential VIL from the input-side power supply, and outputs a signal S1 that sets the high potential VIH to a high level and sets the low potential VIL to a low level.
- the level shift unit 4 that has received the signal S1 output from the switching unit 3a is in phase with the received signal S1 and has the high potential VOH at the high level and the low potential VOL at the same level as in the first and second comparative examples.
- a signal S2 for setting the low level is output.
- the high potential VOH is an active state potential that is controlled to be driven in the controlled element that receives the output signal VOUT from the interface circuit 10a.
- the low potential VOL is a potential (for example, a GND potential) that is not driven in the controlled element. Therefore, the output buffer 5 that has received the signal output from the level shift unit 4 outputs a high active output signal VOUT.
- the interface circuit 10a receives the input signal VIN (first signal) that sets the high potential VIH (first potential) to the high level and the low potential VIL (second potential) to the low level, An output signal VOUT (second signal) that sets the potential VOH (third potential) to a high level and the low potential VOL (fourth potential) to a low level is output.
- the interface circuit 10a determines whether the output signal VOUT is in phase with the input signal VIN depending on which of the high potential VIH and the low potential VIL is a reference potential corresponding to inactive (for example, GND potential).
- a polarity control unit 1a that controls whether the polarity of VOUT is inverted with respect to the input signal VIN is provided.
- the input signal VIN is When the potential is the GND potential, the output signal VOUT can be one of a high level and a low level. When the input signal VIN is not the GND potential, the output signal VOUT can be the other of the high level and the low level. As a result, a desired output signal VOUT can be output regardless of whether the input signal VIN is high active or low active.
- the polarity control unit 1a when the low potential VIL is a reference potential corresponding to inactive (for example, GND potential), the polarity control unit 1a has a signal S1 (third signal) that is in phase with the input signal VIN.
- the high potential VIH is the reference potential (for example, the GND potential)
- the signal S1 whose polarity is inverted with respect to the input signal VIN is output.
- the interface circuit 10a receives the signal S1, and outputs a signal S2 (second signal) that is in phase with the signal S1, outputs the high potential VOH to the high level, and sets the low potential VOL to the low level. 4 and an output buffer 5 that amplifies the signal S2 and outputs an output signal VOUT.
- the high active output signal VOUT can be output.
- FIG. 5 is a circuit diagram showing an embodiment of the interface circuit 10a.
- the polarity control unit 1 a includes, for example, two input terminals 201 and 202, two output terminals 203 and 204, two power supply terminals 205 and 206, and two AND circuits 21 and 22. And three inverters 24, 25, 26 and an OR circuit 23.
- the input terminal 201 receives an input signal VIN.
- the input terminal 202 is grounded, and a GND potential that is a reference potential is applied.
- the power supply terminal 205 is connected to the low potential side of the input side power supply, and is applied with the low potential VIL.
- the power supply terminal 206 is connected to the high potential side of the input side power supply and is applied with the high potential VIH.
- One input terminal of the AND circuit 21 is directly connected to the input terminal 201.
- the other input terminal of the AND circuit 21 is connected to the input terminal 202 via the inverter 25.
- One input terminal of the AND circuit 22 is directly connected to the input terminal 202.
- the other input terminal of the AND circuit 22 is connected to the input terminal 201 via the inverter 26.
- One input terminal of the OR circuit 23 is connected to the output terminal of the AND circuit 21.
- the other input terminal of the OR circuit 23 is connected to the output terminal of the AND circuit 22.
- the output terminal of the OR circuit 23 is connected to the output terminal 203. Therefore, the signal from the OR circuit 23 is output as the signal S1 from the polarity control unit 1a.
- the input terminal of the inverter 24 is connected to the output terminal of the OR circuit 23.
- the output terminal of the inverter 24 is connected to the output terminal 204. Therefore, an inverted signal of the signal from the OR circuit 23 is output from the output terminal 204.
- FIG. 6 is a signal showing a change in potential state of the input terminal 201, the input terminal 202, the output terminal of the AND circuit 21, the output terminal of the AND circuit 22, and the output terminal (output terminal 203) of the OR circuit 23. It is a waveform diagram.
- FIG. 6A shows a case where the high level (high potential VIH) is a positive potential and the low level (low potential VIL) receives an input signal VIN having a GND potential.
- Each logic circuit of the polarity control unit 1a receives the high potential VIH and the low potential VIL from the input-side power supply. Therefore, the AND circuit 22 recognizes the potential of the input terminal directly connected to the input terminal 202 to which the GND potential is applied as a low level. As a result, the AND circuit 22 always outputs a low level signal.
- the AND circuit 21 recognizes the potential of the input terminal connected to the input terminal 202 through the inverter 25 as a high level.
- the input signal VIN is input to the input terminal of the AND circuit 21 directly connected to the input terminal 201.
- the AND circuit 21 outputs a signal in phase with the input signal VIN input to the input terminal 201.
- the OR circuit 23 outputs a signal having the same phase as the input signal VIN input to the input terminal 201 as the signal S1.
- FIG. 6B shows a case where an input signal VIN is received in which the high level (high potential VIH) is the GND potential and the low level (low potential VIL) is the negative potential.
- Each logic circuit of the polarity control unit 1a receives the high potential VIH and the low potential VIL from the input-side power supply. Therefore, the AND circuit 22 recognizes the potential of the input terminal directly connected to the input terminal 202 to which the GND potential is applied as a high level. Further, an inverted signal of the input signal VIN is input to the input terminal of the AND circuit 22 connected to the input terminal 201 via the inverter 26. Therefore, as shown in FIG. 6B, the AND circuit 22 outputs an inverted signal of the input signal VIN input to the input terminal 201.
- the AND circuit 21 recognizes the potential applied to the input terminal connected to the input terminal 202 via the inverter 25 as a low level. Therefore, the AND circuit 21 always outputs a low level signal.
- the OR circuit 23 outputs an inverted signal of the input signal VIN input to the input terminal 201 as the signal S1.
- the polarity control unit 1a including the circuit configuration shown in FIG. 5 can be used when the input signal VIN is in the GND potential state regardless of whether the high level or the low level of the input signal VIN is the GND potential.
- the signal S1 that is at a low level and is at a high level when the input signal VIN is not at the GND potential can be output from the output terminal 203.
- the level shift unit 4 includes two input terminals 401 and 402, an output terminal 403, three power supply terminals 404 to 406, and four PMOS transistors (PMOSFET: P-channel type Metal Oxide).
- PMOSFET P-channel type Metal Oxide
- Semiconductor field effect transistors P-type field effect transistors
- NMOSFET N-channel type Metal Oxide Semiconductor Field Effect Transistors
- the input terminal 401 is connected to the output terminal 203 of the polarity control unit 1a, and the input terminal 402 is connected to the output terminal 204 of the polarity control unit 1a.
- the power supply terminal 405 is connected to the high potential side of the input side power supply and is applied with the high potential VIH.
- the power supply terminal 406 is connected to the high potential side of the output side power supply, and is applied with the high potential VOH.
- the power supply terminal 404 is connected to the low potential side of the output side power supply, and is applied with the low potential VOL.
- the sources of the PMOS transistor M41 and the PMOS transistor M42 are connected to the power supply terminal 405 (high potential VIH).
- the gate of the PMOS transistor M41 is connected to the input terminal 401, and the gate of the PMOS transistor M42 is connected to the input terminal 402.
- the sources of the NMOS transistor M45 and the NMOS transistor M46 are connected to the power supply terminal 404 (low potential VOL).
- One gate of NMOS transistor M45 and NMOS transistor M46 is connected to the other drain of NMOS transistor M45 and NMOS transistor M46, respectively. That is, the NMOS transistor M45 and the NMOS transistor M46 are cross-coupled.
- the drains of the PMOS transistor M41 and the PNMOS transistor M45 are connected to each other, and the drains of the PMOS transistor M42 and the NMOS transistor M46 are connected to each other.
- the sources of the PMOS transistor M43 and the PMOS transistor M44 are connected to the power supply terminal 406 (high potential VOH).
- One gate of the PMOS transistor M43 and the PMOS transistor M44 is connected to the other drain of the PMOS transistor M43 and the PMOS transistor M44, respectively. That is, the PMOS transistor M43 and the PMOS transistor M44 are cross-coupled.
- the sources of the NMOS transistor M47 and the NMOS transistor M48 are connected to the power supply terminal 404 (low potential VOL).
- the gate of the NMOS transistor M47 is connected to the drains of the PMOS transistor M41 and the PNMOS transistor M45, and the gate of the NMOS transistor M48 is connected to the drains of the PMOS transistor M42 and the NMOS transistor M46.
- the drains of the PMOS transistor M43 and the NMOS transistor M47 are connected to each other, and the drains of the PMOS transistor M44 and the NMOS transistor M48 are connected to each other.
- the drains of the PMOS transistor M43 and the NMOS transistor M47 are connected to the output terminal 403.
- the source-drain of the PMOS transistor M42 becomes conductive, so the high potential VIH is applied to the gate of the NMOS transistor M45, and the NMOS transistor M45 Conduction between source and drain. Since the high potential VIH is applied to the gate of the PMOS transistor M41, the PMOS transistor M41 does not conduct between the source and the drain. For this reason, the potentials of the drains of the PMOS transistor M41 and the NMOS transistor M45 maintain the low potential VOL.
- the low potential VOL is applied to the gate of the NMOS transistor M46 connected to the drain of the NMOS transistor M45, the source-drain of the NMOS transistor M46 is not conducted.
- the source and the drain of the PMOS transistor M42 are conductive, the potentials of the drains of the PMOS transistor M42 and the NMOS transistor M46 maintain the high potential VIH.
- the source-drain of the NMOS transistor M47 is not conductive.
- the drain potentials of the PMOS transistor M43 and the NMOS transistor M47 maintain the high potential VOH.
- the source-drain of the PMOS transistor M43 is conductive, the high potential VIH is applied to the gate of the PMOS transistor M44, and the source-drain of the PMOS transistor M44 is not conductive. As described above, since the source and drain of the NMOS transistor M48 are conductive, the drain potentials of the PMOS transistor M44 and the NMOS transistor M48 maintain the low potential VOL.
- the signal S1 output from the output terminal 203 is at a high level (that is, when the input terminal 401 receives a high level signal)
- the potentials of the drains of the PMOS transistor M43 and the NMOS transistor M47 are the high potential VOH.
- a signal S2 having a high potential VOH is output from the output terminal 403 connected to the drain.
- the source-drain of the PMOS transistor M41 is conductive, the high potential VIH is also applied to the gate of the NMOS transistor M46, and the source-drain of the NMOS transistor M46 is conductive. Further, when the signal S1 output from the output terminal 203 is the low potential VIL, the signal output from the output terminal 204 becomes the high potential VIH, so that the source ⁇ of the PMOS transistor M42 whose gate is connected to the output terminal 204 ⁇ There is no conduction between the drains. For this reason, the potentials of the drains of the PMOS transistor M42 and the NMOS transistor M46 are maintained at the low potential VOL.
- the drain potential of the NMOS transistor M46 is the low potential VOL
- the source-drain of the NMOS transistor M45 whose gate is connected to the drain of the NMOS transistor M46 is not conducted.
- the source and drain of the PMOS transistor M41 are conductive, the drain potentials of the PMOS transistor M41 and the NMOS transistor M45 maintain the high potential VIH.
- the source-drain of the NMOS transistor M48 whose gate is connected to the drain (low potential VOL) of the NMOS transistor M46 does not conduct. Further, as described above, since the source-drain of the NMOS transistor M47 becomes conductive, the low potential VOL is applied to the gate of the PMOS transistor M44, and the source-drain of the PMOS transistor M44 becomes conductive. Therefore, the drain potentials of the PMOS transistor M44 and the NMOS transistor M48 maintain the high potential VOH.
- the drain potential of the PMOS transistor M44 is the high potential VOH
- the source-drain of the PMOS transistor M43 whose gate is connected to the drain of the PMOS transistor M44 is not conducted.
- the source and drain of the NMOS transistor M47 are conductive, the potentials of the drains of the PMOS transistor M43 and the NMOS transistor M47 maintain the low potential VOL.
- the signal S1 output from the output terminal 203 is at a low level (that is, when the input terminal 401 receives a low level signal)
- the potentials of the drains of the PMOS transistor M43 and the NMOS transistor M47 are the low potential VOL.
- the signal S2 of the low potential VOL is output from the output terminal 403 connected to the drain.
- the level shift unit 4 when receiving the high level signal S1, the level shift unit 4 outputs the high potential VOH signal S2 from the output terminal 403, and when receiving the low level signal Si, the output terminal 403 has the low potential VOL.
- the signal S2 is output. That is, the level shift unit 4 is in phase with the signal S1 input to the input terminal 401, and outputs a signal S2 in which the high level is shifted to the high potential VOH and the low level is shifted to the low potential VOL.
- the output buffer 5 includes an input terminal 501 to which the signal S2 from the level shift unit 4 is input, an output terminal 502, two power supply terminals 503 and 504, and even-stage CMOS inverters 5-1 to 5-n (n Is a positive even number).
- the power supply terminal 503 is connected to the low potential side of the output side power supply and is applied with the low potential VOL.
- the power supply terminal 504 is connected to the high potential side of the output side power supply, and is applied with the high potential VOH.
- the CMOS inverters 5-1 to 5-n amplify the signal S2 from the level shift unit 4 so as to obtain a current necessary for driving the subsequent load of the interface circuit 10a, and then output the output signal VOUT. Output from the output terminal 502.
- the polarity control unit 1a when the low potential VIL is the GND potential, the polarity control unit 1a outputs the signal S1 having the same phase as the input signal VIN, and the high potential VIH is the GND potential. In this case, the signal S1 having the polarity reversed with respect to the input signal VIN is output. Then, the level shift unit 4 outputs a signal S2 having the same phase as the signal S1. The output buffer 5 outputs an output signal VOUT that is in phase with the signal S2.
- the interface circuit 10a can output the high-active output signal VOUT regardless of whether the GND potential, which is a reference potential corresponding to inactive, corresponds to the high level or the low level of the input signal VIN. it can.
- FIG. 7 and 8 are circuit block diagrams showing the configuration of the interface circuit 10b according to the second embodiment.
- a high-active signal in which a high level (high potential VIH) is a positive potential and a low level (low potential VIL) is a reference potential (here, GND potential) corresponding to inactivity is used as an input signal VIN.
- VIN high level
- VIL low level
- GND potential reference potential
- FIG. 8 shows a case where a low active signal in which the high level is the GND potential and the low level is the negative potential is received as the input signal VIN.
- the configuration of the interface circuit 10b itself is the same in FIGS.
- the interface circuit 10b is a circuit that outputs a low active output signal VOUT regardless of which of the high level and low level of the input signal VIN is the GND potential. Therefore, the interface circuit 10b can be applied to a circuit that outputs the output signal VOUT to a controlled element that operates according to a low-active control signal.
- the interface circuit 10b is different from the interface circuit 10a shown in FIGS. 3 and 4 in that it includes a polarity control unit 1b instead of the polarity control unit 1a.
- the polarity control unit 1b makes the output signal S1 in phase with the input signal VIN depending on whether the GND potential, which is a reference potential corresponding to inactive, corresponds to the high level or the low level of the input signal VIN.
- the polarity of the output signal S1 is controlled to be inverted with respect to the input signal VIN. Specifically, when the GND potential corresponds to the high level of the input signal VIN, the polarity control unit 1b makes the output signal S1 in phase with the input signal VIN, and the GND potential corresponds to the low level of the input signal VIN.
- the polarity of the output signal S1 is inverted with respect to the input signal VIN.
- the polarity control unit 1b includes, for example, a voltage detection unit 2b and a switching unit 3b as its internal configuration.
- the voltage detector 2b receives a GND potential that is a reference potential corresponding to inactive, and also receives a low potential VIL from the input-side power source, and compares the two potentials. When the difference between the low potential VIL and the GND potential is smaller than the threshold value, the voltage detection unit 2b outputs a detection signal indicating that the low potential VIL is the GND potential to the switching unit 3b, and the low potential VIL and the GND potential Is equal to or greater than the threshold value, a detection signal indicating that the high potential VIH is the GND potential is output to the switching unit 3b.
- the switching unit 3b receives the input signal VIN and switches whether the signal S1 is in phase with the input signal VIN or is inverted according to the detection signal from the voltage detection unit 2a.
- the switching unit 3b when the detection signal indicates that the high potential VIH is the GND potential, the switching unit 3b outputs the signal S1 having the same phase as the input signal VIN to the level shift unit 4, and the low potential VIL is the GND potential. In the case where the detection signal indicates that, the signal S1 having the polarity reversed with respect to the input signal VIN is output to the level shift unit 4.
- the switching unit 3b receives the high potential VIH and the low potential VIL from the input-side power supply, sets the high level of the signal S1 to the high potential VIH, and sets the low level to the low potential VIL.
- the level shift unit 4 that has received the signal S1 output from the switching unit 3b is in phase with the received signal S1 and sets the high potential VOH to the high level and the low potential VOL to the low level, as in the first embodiment.
- a signal S2 for setting the level is output.
- the low potential VOL is a potential in an active state that is controlled to be driven in the controlled element that receives the output signal VOUT from the interface circuit 10a.
- the high potential VOH is a potential (for example, a GND potential) that is not driven in the controlled element. Therefore, the output buffer 5 that has received the signal output from the level shift unit 4 outputs a low active output signal VOUT.
- the high level (high potential VIH) is a positive potential and the low level (low potential VIL) is a GND potential corresponding to inactive
- a high active input signal VIN is received.
- the detection unit 2b outputs a detection signal indicating that the low potential VIL is the GND potential. Therefore, the switching unit 3b outputs a signal S1 whose polarity is inverted with respect to the input signal VIN.
- the level shift unit 4 and the output buffer 5 output a signal in phase with the signal S1 output from the switching unit 3b. Therefore, the polarity of the output signal VOUT is inverted with respect to the input signal VIN.
- the interface circuit 10b when the high potential VIH is a reference potential corresponding to inactive (for example, the GND potential), the interface circuit 10b outputs the signal S1 having the same phase as the input signal VIN, and the low potential VIL is the GND potential.
- a polarity control unit 1b that outputs a signal S1 having a polarity inverted with respect to the input signal VIN is provided.
- the level shift unit 4 and the output buffer 5 output a signal in phase with the signal S1.
- the low active output The signal VOUT can be output.
- FIG. 9 is a circuit diagram showing an embodiment of the interface circuit 10b.
- the interface circuit 10b of the embodiment shown in FIG. 9 is different from the interface circuit 10a of the embodiment shown in FIG. 5 in that a polarity control unit 1b is provided instead of the polarity control unit 1a.
- the two input terminals of the AND circuit 21 are directly connected to the input terminals 201 and 202, respectively.
- One input terminal of the AND circuit 22 is connected to the input terminal 202 via the inverter 27, and the other input terminal of the AND circuit 22 is connected to the input terminal 201 via the inverter 26.
- (Operation of polarity control unit) 10 shows an input terminal 201, an input terminal 202, an output terminal of the AND circuit 21, an output terminal of the AND circuit 22, and an output terminal of the OR circuit 23 in the embodiment of the polarity control unit 1b shown in FIG. It is a signal waveform diagram which shows the change of an electric potential state with the output terminal 203).
- FIG. 10A shows a case where the high level (high potential VIH) is a positive potential and the low level (low potential VIL) receives an input signal VIN having a GND potential.
- Each logic circuit of the polarity control unit 1a receives the high potential VIH and the low potential VIL from the input-side power supply. Therefore, the AND circuit 21 recognizes the potential of the input terminal directly connected to the input terminal 202 to which the GND potential is input as a low level. As a result, the AND circuit 21 always outputs a low level signal.
- the AND circuit 22 recognizes the potential of the input terminal connected to the input terminal 202 through the inverter 27 as a high level. Further, an inverted signal of the input signal VIN is input to the input terminal of the AND circuit 22 connected to the input terminal 201 via the inverter 26. Therefore, as shown in FIG. 10A, the AND circuit 22 outputs an inverted signal of the input signal VIN input to the input terminal 201.
- the OR circuit 23 outputs an inverted signal of the input signal VIN input to the input terminal 201 as the signal S1.
- FIG. 10B shows a case where an input signal VIN is received in which the high level (high potential VIH) is the GND potential and the low level (low potential VIL) is the negative potential.
- Each logic circuit of the polarity control unit 1a receives the high potential VIH and the low potential VIL from the input-side power supply.
- the AND circuit 21 recognizes the potential of the input terminal directly connected to the input terminal 202 to which the GND potential is applied as a high level.
- the input signal VIN is input to the input terminal of the AND circuit 21 directly connected to the input terminal 201. Therefore, as shown in FIG. 10B, the AND circuit 21 outputs a signal having the same phase as the input signal VIN input to the input terminal 201 as the signal S1.
- the AND circuit 22 recognizes the potential of the input terminal connected to the input terminal 202 via the inverter 25 as a low level. Therefore, the AND circuit 22 always outputs a low level signal.
- the OR circuit 23 outputs a signal having the same phase as the input signal VIN input to the input terminal 201 as the signal S1.
- the polarity control unit 1b including the circuit configuration shown in FIG. 9 can operate when the input signal VIN is in the GND potential state regardless of whether the high level or the low level of the input signal VIN is the GND potential.
- a signal that becomes low level when the input signal VIN is not at the GND potential can be output from the output terminal 203.
- the level shift unit 4 shown in FIG. 9 has the same circuit configuration as that shown in FIG. 5, and outputs a signal S2 having the same phase as the signal S1.
- the output buffer 5 shown in FIG. 9 has the same circuit configuration as that shown in FIG. 5, and outputs an output signal VOUT in phase with the signal S2.
- the interface circuit 10b can output the low active output signal VOUT regardless of whether the GND potential, which is the reference potential corresponding to inactive, corresponds to the high level or the low level of the input signal VIN. it can.
- Embodiment 3 (Configuration of interface circuit)
- the interface circuit 10a according to the first embodiment operates by receiving the high potential VIH and the low potential VIL from the input-side power supply.
- the interface circuit according to the third embodiment receives the high potential VIH from the input-side power supply, and internally generates a potential corresponding to the low potential VIL from the high potential VIH. Therefore, it is not necessary to receive the low potential VIL from the input side power supply.
- FIGS. 11 and 12 are circuit block diagrams showing the configuration of the interface circuit 10c according to the third embodiment.
- a high active signal whose high level (high potential VIH) is a positive potential and whose low level (low potential VIL) is a reference potential (here, GND potential) corresponding to inactive is used as an input signal VIN.
- VIN high potential
- VIL low potential
- GND potential reference potential
- FIG. 12 shows a case where a low active signal having a high level of GND potential and a low level of negative potential is received as the input signal VIN.
- the configuration of the interface circuit 10c itself is the same in FIGS.
- the interface circuit 10c is a circuit that outputs a high active output signal VOUT regardless of whether the high level or low level of the input signal VIN is the GND potential. Therefore, the interface circuit 10c can be applied to a circuit that outputs the output signal VOUT to a controlled element that operates according to a high-active control signal.
- the interface circuit 10c does not receive the low potential VIL from the input-side power supply as compared to the interface circuit 10a shown in FIGS. It differs in the point to prepare.
- the voltage generation unit 6a generates a potential VIL_INT that is lower than the high potential VIH by a predetermined voltage ⁇ V, and outputs the generated potential VIL_INT to the polarity control unit 1a and the level shift unit 4 as a low potential side potential.
- the voltage ⁇ V is substantially the same as the difference (VIH ⁇ VIL) between the high potential VIH and the low potential VIL of the input signal VIN. A voltage that allows sufficient switching is set.
- FIG. 13 is a circuit diagram showing an example of the interface circuit 10c according to the third embodiment.
- the embodiment of the interface circuit 10c shown in FIG. 13 is different from the embodiment of the interface circuit 10a shown in FIG. 5 in that a voltage generation unit 6a is provided.
- the voltage generator 6a includes an inverting input terminal 61, a first non-inverting input terminal 62, a second non-inverting input terminal 64, an output terminal 63, resistors R61, R62, R63, R64, and an operational amplifier 60. Is a non-inverting amplifier.
- the inverting input terminal 61 is grounded and a GND potential is applied.
- a constant potential ⁇ VREF (second reference potential) is applied to the first non-inverting input terminal 62.
- the high potential VIH of the input side power supply is applied to the second non-inverting input terminal 64.
- the resistor R61 is connected between the inverting input terminal 61 and the inverting input terminal of the operational amplifier.
- the resistor R62 has one terminal connected to the inverting input terminal of the operational amplifier, and the other terminal connected to the output terminal 63 and the output terminal of the operational amplifier.
- the resistor R63 is connected between the first non-inverting input terminal 62 and the non-inverting input terminal of the operational amplifier.
- the resistor R64 is connected between the second non-inverting input terminal 64 and the non-inverting input terminal of the operational amplifier.
- the voltage V + obtained by dividing the voltage between the high potential VIH and the second reference potential ( ⁇ VREF) by the resistor R63 and the resistor R64 is input to the non-inverting input terminal of the operational amplifier. Is done.
- the resistance values of the resistor R61, the resistor R62, the resistor R63, and the resistor R64, and the constant potential ⁇ VREF are appropriately set so that the potential of the output terminal 63 is approximately the same as the low potential VIL.
- Embodiment 4 (Configuration of interface circuit)
- the interface circuit 10b according to the second embodiment operates by receiving the high potential VIH and the low potential VIL from the input-side power supply.
- the interface circuit according to the fourth embodiment receives the low potential VIL from the input-side power supply and internally generates the high potential VIH_INT from the low potential VIL. Therefore, it is not necessary to receive the high potential VIH from the input side power supply.
- FIG. 14 and 15 are circuit block diagrams showing the configuration of the interface circuit 10d according to the fourth embodiment.
- a high-active signal in which a high level (high potential VIH) is a positive potential and a low level (low potential VIL) is a reference potential (here, GND potential) corresponding to inactivity is used as an input signal VIN.
- VIN high level
- VIL low level
- GND potential reference potential
- FIG. 15 shows a case where a low active signal having a high level of GND potential and a low level of negative potential is received as the input signal VIN.
- the configuration of the interface circuit 10b itself is the same in FIGS.
- the interface circuit 10d is a circuit that outputs a low-active output signal VOUT regardless of whether the high level or low level of the input signal VIN is the GND potential. Therefore, the interface circuit 10d can be applied to a circuit that outputs the output signal VOUT to a controlled element that operates according to a low-active control signal.
- the interface circuit 10d does not receive the high potential VIH from the input-side power supply, and the voltage generator 6b is compared with the interface circuit 10b shown in FIGS. It differs in the point to prepare.
- the voltage generation unit 6b generates a potential VIH_INT that is increased by a predetermined voltage ⁇ V from the low potential VIL, and outputs the generated potential VIH_INT to the polarity control unit 1b and the level shift unit 4 as a high potential side potential.
- the voltage ⁇ V is approximately the same as the difference (VIH ⁇ VIL) between the high potential VIH and the low potential VIL of the input signal VIN. A voltage that allows sufficient switching is set.
- FIG. 16 is a circuit diagram showing an example of the interface circuit 10d according to the fourth embodiment.
- the embodiment of the interface circuit 10d shown in FIG. 16 is different from the embodiment of the interface circuit 10b shown in FIG. 5 in that a voltage generation unit 6b is provided.
- the voltage generator 6b includes, for example, an inverting input terminal 61, a first non-inverting input terminal 62, a second non-inverting input terminal 64, an output terminal 63, a resistor R65,
- the inverting amplifier includes R66, R67, R68 and an operational amplifier 60.
- a constant potential ⁇ VREF (second reference potential) is applied to the inverting input terminal 61.
- the first non-inverting input terminal 62 is grounded and a GND potential is applied.
- a low potential VIL is applied to the second non-inverting input terminal 64.
- the resistor R65 is connected between the inverting input terminal 61 and the inverting input terminal of the operational amplifier.
- the resistor R66 has one terminal connected to the inverting input terminal of the operational amplifier, and the other terminal connected to the output terminal 63 and the output terminal of the operational amplifier.
- the resistor R67 is connected between the first non-inverting input terminal 62 and the non-inverting input terminal of the operational amplifier.
- the resistor R68 is connected between the second non-inverting input terminal 64 and the non-inverting input terminal of the operational amplifier.
- the potential V + obtained by dividing the voltage between the low potential VIL and the first reference potential (GND) by the resistor R67 and the resistor R68 is input to the non-inverting input terminal of the operational amplifier.
- the resistance values of the resistor R65, the resistor R66, the resistor R67, and the resistor R68 and the constant potential ⁇ VREF are set as appropriate so that the potential of the output terminal 63 becomes approximately the same as the high potential VIH.
- the interface circuit 10a of the first embodiment shown in FIGS. 3 and 4 may include a voltage detection unit 2b shown in FIGS. 7 and 8 instead of the voltage detection unit 2a.
- the interface circuit 10b according to the second embodiment illustrated in FIGS. 7 and 8 may include the voltage detection unit 2a illustrated in FIGS. 3 and 4 instead of the voltage detection unit 2b.
- the polarity control unit 1a is not limited to the circuit configuration shown in FIG. That is, the polarity control unit 1a outputs the signal S1 to be output in phase with the input signal VIN when the GND potential corresponds to the low level of the input signal VIN, and outputs when the GND potential corresponds to the high level of the input signal VIN.
- the signal S1 may be configured by a logic circuit (logic circuit equivalent to FIG. 5) that is appropriately designed so that the polarity is inverted with respect to the input signal VIN.
- the polarity control unit 1b is not limited to the circuit configuration shown in FIG. That is, the polarity control unit 1b outputs the signal S1 to be output in phase with the input signal VIN when the GND potential corresponds to the high level of the input signal VIN, and outputs when the GND potential corresponds to the low level of the input signal VIN.
- the signal S1 may be configured by a logic circuit (a logic circuit equivalent to FIG. 9) that is appropriately designed so that the polarity is inverted with respect to the input signal VIN.
- the polarity control unit 1a outputs the signal S1 to be output in phase with the input signal VIN when the GND potential corresponds to the low level of the input signal VIN, and outputs the signal S1 when the GND potential corresponds to the high level of the input signal VIN.
- the polarity control unit 1b outputs the signal S1 to be output in phase with the input signal VIN when the GND potential corresponds to the high level of the input signal VIN, and outputs when the GND potential corresponds to the low level of the input signal VIN.
- the signal S1 may be configured by a storage unit that stores a program whose polarity is inverted with respect to the input signal VIN, and a processor that executes the program.
- the voltage detector 2a compares the high potential VIH with the GND potential that is the reference potential.
- the voltage detection unit 2a is not limited to this configuration. For example, by comparing the potential obtained by dividing the high potential VIH with the GND potential, either the high potential VIH or the low potential VIL is detected. You may detect whether it is a GND electric potential.
- the voltage detection unit 2b compares, for example, the potential obtained by dividing the low potential VIL with the GND potential to determine which of the high potential VIH and the low potential VIL is the GND potential. It may be detected.
- the voltage detection unit 2a when the potential difference between the high potential VIH and the low potential VIL is Vd, the voltage detection unit 2a is, for example, higher than the high potential VIH and a potential that is lower by Vd / 2 than the GND potential, and by Vd / 2 from the GND potential By comparing a reference potential lower than a high potential, it may be detected which of the high potential VIH and the low potential VIL is the GND potential. In this case, when the difference between the high potential VIH and the reference potential is smaller than Vd / 2, the voltage detection unit 2a outputs a detection signal indicating that the high potential VIH is the GND potential, and refers to the high potential VIH. When the difference from the potential is Vd / 2 or more, a detection signal indicating that the low potential VIL is the GND potential may be output.
- the voltage detector 2b compares, for example, the low potential VIL with a reference potential that is higher than a potential that is lower by Vd / 2 than the GND potential and lower than a potential that is higher by Vd / 2 than the GND potential. It may be detected which of the VIH and the low potential VIL is the GND potential. In this case, when the difference between the low potential VIL and the reference potential is smaller than Vd / 2, the voltage detection unit 2b outputs a detection signal indicating that the low potential VIL is the GND potential, and refers to the low potential VIL. When the difference from the potential is Vd / 2 or more, a detection signal indicating that the high potential VIH is the GND potential may be output.
- the level shift unit 4 is not limited to the circuit configuration shown in FIG.
- the level shift unit 4 is appropriately designed to output a signal S2 having a high potential VOH when the input signal S1 is at a high level and to output a signal S2 having a low potential VOL when the signal S1 is at a low level.
- the plurality of logic circuits may be configured.
- FIG. 17 is a diagram showing another circuit configuration of the level shift unit 4.
- the output terminal 403 is not connected to the drains of the PMOS transistor M43 and the NMOS transistor M47, but to the drains of the PMOS transistor M44 and the NMOS transistor M48, as compared with the level shift unit 4 shown in FIG. The difference is that they are connected via an inverter 42.
- the level shift unit 4 outputs the signal S2 of the high potential VOH when the input signal S1 is high level, and the low potential VOL when the signal S1 is low level.
- the signal S2 can be output.
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Abstract
Description
図1は、比較例1に係るインターフェース回路100aの構成を示す回路ブロック図である。インターフェース回路100aは、高電位VIHをハイレベルとし、低電位VILをローレベルとする入力信号VINを受け、高電位VOHをハイレベルとし、低電位VOLをローレベルとする出力信号VOUTを出力する回路である。図1に示されるように、インターフェース回路100aは、入力バッファ101と、レベルシフト部4と、出力バッファ5とを備える。
図2は、比較例2に係るインターフェース回路100bの構成を示す回路ブロック図である。インターフェース回路100bは、図1に示すインターフェース回路100aと比較して、入力バッファ101の代わりに入力インバータ102を備える点で相違する。
(インターフェース回路の構成)
図3および図4は、実施の形態1に係るインターフェース回路10aの構成を示す回路ブロック図である。図3は、ハイレベル(高電位VIH)が正電位であり、ローレベル(低電位VIL)がインアクティブに相当する基準電位(ここでは、GND電位)であるハイアクティブの信号を入力信号VINとして受けた場合を示す。図4は、ハイレベルがインアクティブに相当する基準電位(ここでは、GND電位)であり、ローレベルが負電位であるローアクティブの信号を入力信号VINとして受けた場合を示す。インターフェース回路10a自体の構成は図3および図4で同一である。
(極性制御部の回路構成)
図5は、インターフェース回路10aの実施例を示す回路図である。図5に示されるように、極性制御部1aは、たとえば、2つの入力端子201,202と、2つの出力端子203,204と、2つの電源端子205,206と、2つのAND回路21,22と、3つのインバータ24,25,26と、OR回路23とを含む。
図6は、入力端子201と、入力端子202と、AND回路21の出力端子と、AND回路22の出力端子と、OR回路23の出力端子(出力端子203)との電位状態の変化を示す信号波形図である。
図5に示されるように、レベルシフト部4は、2つの入力端子401,402と、出力端子403と、3つの電源端子404~406と、4つのPMOSトランジスタ(PMOSFET:P-channel type Metal Oxide Semiconductor Field Effect Transistor(P型電界効果トランジスタ))M41,M42,M43,M44と、4つのNMOSトランジスタ(NMOSFET:N-channel type Metal Oxide Semiconductor Field Effect Transistor(N型電界効果トランジスタ))M45,M46,M47,M48とを含む。
図5に示す回路構成を有するレベルシフト部4の動作について説明する。まず、出力端子203から出力される信号S1がハイレベル(高電位VIH)である場合について説明する。この場合、入力端子401は、高電位VIHの信号を受け、入力端子402は、低電位VILの信号を受ける。これにより、PMOSトランジスタM42のゲートに低電位VILが印加され、PMOSトランジスタM42のソース-ドレイン間が導通する。
次に、出力端子203から出力される信号がローレベル(低電位VIL)である場合について説明する。この場合、入力端子401は、低電位VILの信号を受け、入力端子402は、高電位VIHを信号を受ける。そのため、PMOSトランジスタM41のゲートに低電位VILが印加され、PMOSトランジスタM41のソース-ドレイン間が導通する。
出力バッファ5は、レベルシフト部4からの信号S2が入力される入力端子501と、出力端子502と、2つの電源端子503,504と、偶数段のCMOSインバータ5-1~5-n(nは正の偶数)とを含む。
(インターフェース回路の構成)
図7および図8は、実施の形態2に係るインターフェース回路10bの構成を示す回路ブロック図である。図7は、ハイレベル(高電位VIH)が正電位であり、ローレベル(低電位VIL)がインアクティブに相当する基準電位(ここでは、GND電位)であるハイアクティブの信号を入力信号VINとして受けた場合を示す。図8は、ハイレベルがGND電位であり、ローレベルが負電位であるローアクティブの信号を入力信号VINとして受けた場合を示す。インターフェース回路10b自体の構成は図7および図8において同一である。
(極性制御部の回路構成)
図9は、インターフェース回路10bの実施例を示す回路図である。図9に示す実施例のインターフェース回路10bは、図5に示す実施例のインターフェース回路10aと比較して、極性制御部1aの代わりに極性制御部1bを備える点で相違する。
図10は、図9に示す極性制御部1bの実施例における、入力端子201と、入力端子202と、AND回路21の出力端子と、AND回路22の出力端子と、OR回路23の出力端子(出力端子203)との電位状態の変化を示す信号波形図である。
(インターフェース回路の構成)
上記の実施の形態1に係るインターフェース回路10aは、入力側電源から高電位VIHおよび低電位VILを受けて動作する。これに対し、実施の形態3に係るインターフェース回路は、入力側電源から高電位VIHを受け、高電位VIHから低電位VILに相当する電位を内部で生成する。そのため、入力側電源から低電位VILを受ける必要がない。
図13は、実施の形態3に係るインターフェース回路10cの実施例を示す回路図である。図13に示すインターフェース回路10cの実施例は、図5に示すインターフェース回路10aの実施例と比較して、電圧生成部6aを備える点で相違する。
VO=V+×(1+(R62の抵抗値)/(R61の抵抗値))
の式で示される電位VOを出力端子63から出力する。
(インターフェース回路の構成)
上記の実施の形態2に係るインターフェース回路10bは、入力側電源から高電位VIHおよび低電位VILを受けて動作する。これに対し、実施の形態4に係るインターフェース回路は、入力側電源から低電位VILを受け、低電位VILから高電位VIH_INTを内部で生成する。そのため、入力側電源から高電位VIHを受ける必要がない。
図16は、実施の形態4に係るインターフェース回路10dの実施例を示す回路図である。図16に示すインターフェース回路10dの実施例は、図5に示すインターフェース回路10bの実施例と比較して、電圧生成部6bを備える点で相違する。
VO=V+-((R66の抵抗値)/(R65の抵抗値))×(-VREF-V+)
の式で示される電位VOを出力端子63から出力する。
図3および図4に示す実施の形態1のインターフェース回路10aは、電圧検知部2aの代わりに、図7および図8に示す電圧検知部2bを備えていてもよい。逆に、図7および図8に示す実施の形態2のインターフェース回路10bは、電圧検知部2bの代わりに、図3および図4に示す電圧検知部2aを備えていてもよい。
Claims (13)
- 第1の電位をハイレベルとし、前記第1の電位よりも低い第2の電位をローレベルとする第1の信号を受け、第3の電位をハイレベルとし、前記第3の電位よりも低い第4の電位をローレベルとする第2の信号を生成するインターフェース回路であって、
前記第1の電位および前記第2の電位のいずれが第1の基準電位であるかに応じて、前記第2の信号を前記第1の信号と同相にするか、前記第2の信号の極性を前記第1の信号に対して反転させるかを制御する制御部を備える、インターフェース回路。 - 前記制御部は、前記第2の電位が前記第1の基準電位である場合、前記第1の信号と同相である信号を第3の信号として出力し、前記第1の電位が前記第1の基準電位である場合、前記第1の信号に対して極性が反転した信号を前記第3の信号として出力し、
前記インターフェース回路は、さらに、前記第3の信号を受け、前記第3の信号と同相であり、かつ、前記第3の電位をハイレベルとし、前記第4の電位をローレベルとする信号を前記第2の信号として生成するレベルシフト部を備える、請求項1に記載のインターフェース回路。 - 前記制御部は、前記第2の電位が前記第1の基準電位である場合、前記第1の信号に対して極性が反転した信号を第3の信号として出力し、前記第1の電位が前記第1の基準電位である場合、前記第1の信号と同相である信号を前記第3の信号として出力し、
前記インターフェース回路は、さらに、前記第3の信号を受け、前記第3の信号と同相であり、かつ、前記第3の電位をハイレベルとし、前記第4の電位をローレベルとする信号を前記第2の信号として生成するレベルシフト部を備える、請求項1に記載のインターフェース回路。 - 前記第2の信号を電流増幅して前記インターフェース回路から出力するバッファ部をさらに備える、請求項2または3に記載のインターフェース回路。
- 前記制御部は、前記第1の電位または前記第1の電位を分圧することにより得られた電位と、参照電位とを比較することにより、前記第1の電位および前記第2の電位のいずれが前記第1の基準電位であるかを示す制御信号を生成する電圧検知部を含み、
前記参照電位は、前記第1の電位と前記第2の電位との電位差の半分だけ前記第1の基準電位よりも低い電位より高く、かつ、前記電位差の半分だけ前記第1の基準電位よりも高い電位より低い電位であり、
前記制御部は、さらに、前記制御信号に応じて、前記第3の信号を、前記第1の信号と同相にするか、極性を反転させるかを切り替える切替部とを含む、請求項2から4のいずれか1項に記載のインターフェース回路。 - 前記制御部は、前記第2の電位または前記第2の電位を分圧することにより得られた電位と、参照電位とを比較することにより、前記第1の電位および前記第2の電位のいずれが前記第1の基準電位であるかを示す制御信号を生成する電圧検知部を含み、
前記参照電位は、前記第1の電位と前記第2の電位との電位差の半分だけ前記第1の基準電位よりも低い電位より高く、かつ、前記電位差の半分だけ前記第1の基準電位よりも高い電位より低い電位であり、
前記制御部は、さらに、前記制御信号に応じて、前記第3の信号を、前記第1の信号と同相にするか、極性を反転させるかを切り替える切替部とを含む、請求項2から4のいずれか1項に記載のインターフェース回路。 - 前記制御部は、第1のAND回路と、第2のAND回路と、OR回路と、第1のインバータと、第2のインバータとを含み、
前記第1のAND回路は、前記第1の信号を受けるとともに、前記第1の基準電位を前記第1のインバータを介して受け、
前記第2のAND回路は、前記第1の信号を前記第2のインバータを介して受けるとともに、前記第1の基準電位を受け、
前記OR回路は、前記第1のAND回路の出力と、前記第2のAND回路の出力とを受けて、前記第3の信号を出力する、請求項2に記載のインターフェース回路。 - 前記制御部は、第1のAND回路と、第2のAND回路と、OR回路と、第1のインバータと、第2のインバータとを含み、
前記第1のAND回路は、前記第1の信号を受けるとともに、前記第1の基準電位を受け、
前記第2のAND回路は、前記第1の信号を前記第1のインバータを介して受けるとともに、前記第1の基準電位を前記第2のインバータを介して受け、
前記OR回路は、前記第1のAND回路の出力と、前記第2のAND回路の出力とを受けて、前記第3の信号を出力する、請求項3に記載のインターフェース回路。 - 前記レベルシフト部は、第1から第4のPMOSトランジスタと、第1から第4のNMOSトランジスタとを含み、
前記第1のPMOSトランジスタにおいて、ゲートが前記第3の信号を受け、ソースが前記第1の電位を受け、
前記第2のPMOSトランジスタにおいて、ゲートが前記第3の信号の反転信号を受け、ソースが前記第1の電位を受け、
前記第1のNMOSトランジスタにおいて、ゲートが前記第2のNMOSトランジスタのドレインに接続され、ソースが前記第4の電位を受け、
前記第2のNMOSトランジスタにおいて、ゲートが前記第1のNMOSトランジスタのドレインに接続され、ソースが前記第4の電位を受け、
前記第1のPMOSトランジスタおよび前記第1のNMOSトランジスタのドレイン同士が接続され、
前記第2のPMOSトランジスタおよび前記第2のNMOSトランジスタのドレイン同士が接続され、
前記第3のPMOSトランジスタにおいて、ゲートが前記第4のPMOSトランジスタのドレインに接続され、ソースが前記第3の電位を受け、
前記第4のPMOSトランジスタにおいて、ゲートが前記第3のPMOSトランジスタのドレインに接続され、ソースが前記第3の電位を受け、
前記第3のNMOSトランジスタにおいて、ゲートが前記第1のPMOSトランジスタおよび前記第1のNMOSトランジスタのドレインに接続され、ソースが前記第4の電位を受け、
前記第4のNMOSトランジスタにおいて、ゲートが前記第2のPMOSトランジスタおよび前記第2のNMOSトランジスタのドレインに接続され、ソースが前記第4の電位を受け、
前記第3のPMOSトランジスタおよび前記第3のNMOSトランジスタのドレイン同士が接続され、
前記第4のPMOSトランジスタおよび前記第4のNMOSトランジスタのドレイン同士が接続され、
前記レベルシフト部は、前記第3のPMOSトランジスタおよび前記第3のNMOSトランジスタのドレインの電位状態の信号、または、前記第4のPMOSトランジスタおよび前記第4のNMOSトランジスタのドレインの電位状態を反転させた信号を前記第2の信号として生成する、請求項2から8のいずれか1項に記載のインターフェース回路。 - 電源から前記第1の電位を受け、前記第1の電位から所定電圧だけ低い電位を前記第2の電位として生成する電圧生成部をさらに備え、
前記制御部は、前記電源から受けた前記第1の電位と、前記電圧生成部により生成された前記第2の電位とに基づいて、前記第3の信号を生成する、請求項2から9のいずれか1項に記載のインターフェース回路。 - 電源から前記第2の電位を受け、前記第2の電位から所定電圧だけ高い電位を前記第1の電位として生成する電圧生成部をさらに備え、
前記制御部は、前記電源から受けた前記第2の電位と、前記電圧生成部により生成された前記第1の電位とに基づいて、前記第3の信号を生成する、請求項2から9のいずれか1項に記載のインターフェース回路。 - 前記電圧生成部は、第1から第4の抵抗と、オペアンプとを含み、
前記第1の抵抗は、前記第1の基準電位が入力される端子と、前記オペアンプの反転入力端子との間に接続され、
前記第2の抵抗は、前記オペアンプの反転入力端子と、前記オペアンプの出力端子との間に接続され、
前記第3の抵抗は、第2の基準電位が入力される端子と、前記オペアンプの非反転入力端子との間に接続され、
前記第4の抵抗は、前記オペアンプの非反転入力端子と、前記電源からの前記第1の電位が入力される端子との間に接続され、
前記第1から第4の抵抗の各々の抵抗値と前記第2の基準電位とは、前記オペアンプの出力端子から出力される電位が前記第2の電位となるように設定されている、請求項10に記載のインターフェース回路。 - 前記電圧生成部は、第1から第4の抵抗と、オペアンプとを含み、
前記第1の抵抗は、第2の基準電位が入力される端子と、前記オペアンプの反転入力端子との間に接続され、
前記第2の抵抗は、前記オペアンプの反転入力端子と、前記オペアンプの出力端子との間に接続され、
前記第3の抵抗は、前記第1の基準電位が入力される端子と、前記オペアンプの非反転入力端子との間に接続され、
前記第4の抵抗は、前記オペアンプの非反転入力端子と、前記電源からの前記第2の電位が入力される端子との間に接続され、
前記第1から第4の抵抗の各々の抵抗値と前記第2の基準電位とは、前記オペアンプの出力端子から出力される電位が前記第1の電位となるように設定されている、請求項11に記載のインターフェース回路。
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