CN103546114A - Circuit and method for adjusting pull-up voltage of bus according to pull-up voltage of slave unit - Google Patents
Circuit and method for adjusting pull-up voltage of bus according to pull-up voltage of slave unit Download PDFInfo
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- CN103546114A CN103546114A CN201310530312.9A CN201310530312A CN103546114A CN 103546114 A CN103546114 A CN 103546114A CN 201310530312 A CN201310530312 A CN 201310530312A CN 103546114 A CN103546114 A CN 103546114A
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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
- H03K19/018557—Coupling arrangements; Impedance matching circuits
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Abstract
The invention discloses a circuit and method for adjusting the pull-up voltage of a bus according to the pull-up voltage of a slave unit. The circuit comprises the bus, a voltage dividing unit, a comparator, a latch and an impedance unit. Voltage output by a first power source is divided through the voltage dividing unit so that divided voltage can be obtained; the first input end of the comparator receives the divided voltage, the second input end of the comparator receives the pull-up voltage of the slave unit through the bus, and the output end of the comparator outputs a comparative result; the first input end of the latch receives the comparative result, the second input end of the latch receives a trigger signal, the output end of the latch outputs a control signal to control the resistance value of a pull-up resistor of the bus to have access to the impedance unit, the pull-up voltage formed by the pull-up resistor of the bus is equal to the pull-up voltage of the slave unit, and voltage matching is achieved. By means of the mode, the pull-up voltage on the bus can be increased automatically according to the working voltage of the slave unit, and then the voltage matching is achieved.
Description
Technical field
The present invention relates to power technique fields, particularly relate to a kind of basis and adjust from the voltage that draws of equipment circuit and method thereof that bus is drawn voltage.
Background technology
The AC-DC(that at present rack server is used exchanges and turns direct current, alternating current-Direct Current) power module has the multiple power types such as 750W, 800W and 1200W and has different suppliers.Wherein 750W and 1200W Shi Yige producer, 800W is another one producer.The communication interface IIC(integrated circuit (IC) bus of the power module of 750W and 1200W, Inter-Integrated Circuit) on, drawing power supply is 5V, and pull-up resistor is 20K, above draws power supply to be integrated in power module inside.On the communication interface IIC of 800W power module, drawing power supply is 3.3V, and pull-up resistor is 20K, above draws power supply to be integrated in power module inside.The device data of power module explicitly calls for, and on the PCB cabling of power module outside, needs to add pull-up resistor, and this pull-up resistor form on draw voltage to draw voltage identical with on power module inside.
Owing to drawing power supply different in two kinds of above-mentioned power modules requirements: one is 3.3V, and one is 5V, produces each other conflict.On IIC, drawing is directly to realize on hardware, and the type according to power module that cannot intelligence realizes the switching between the voltage of two kinds of power supplys.If the power module of the compatible Liang Ge of a server needs producer, cannot be compatible in hardware designs.Individual other server product is exactly because cannot realize the two compatibility, forces to have removed a power module in specification, the compatibility of the power module of 800W for example, and this will reduce the applicability of server power supply module.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of basis and adjusts from the voltage that draws of equipment circuit and method thereof that bus is drawn voltage, can be according to the operating voltage from equipment, automatically increase bus on draw voltage, thereby realize voltage matches.
First aspect provides a kind of basis to adjust from the voltage that draws of equipment the circuit that bus is drawn voltage, this circuit comprises bus, partial pressure unit, comparator, latch and impedance unit, bus with from equipment, be electrically connected to, wherein: partial pressure unit is carried out dividing potential drop to the voltage of the first power supply output, to obtain branch pressure voltage, the first power supply is the multiple power supply that draws magnitude of voltage maximum from equipment corresponding to the connected mode of same type; The first input end of comparator receives branch pressure voltage, and the second input of comparator receives the voltage that draws from equipment by bus, the output output comparative result of comparator; The first input end of latch receives comparative result, the second input of latch receives a triggering signal, the resistance of the pull-up resistor of the output output control signal control group unit access bus of latch, on making that the pull-up resistor of bus forms, draw voltage to equate with the voltage that draws from equipment, realize voltage matches.
In the possible execution mode of the first of first aspect,, bleeder circuit comprises the first resistance and the second resistance, one end of the first resistance connects the first power supply, the other end of the first resistance connects one end of the second resistance and the first input end of comparator, the second end ground connection of the second resistance.
In conjunction with the possible execution mode of the first of first aspect, in the possible execution mode of the second, the first input end of comparator is negative input, and the second input of comparator is positive input, and the output of latch is in-phase output end.
In conjunction with the possible execution mode of the first of first aspect, in the third possible execution mode, the first input end of comparator is positive input, and the second input of comparator is negative input, and the output of latch is reversed-phase output.
The second or the third possible execution mode in conjunction with first aspect, in the 4th kind of possible execution mode, bus comprises data/address bus and clock bus, impedance unit comprises the first switching tube, second switch pipe, the 3rd switching tube, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, wherein, the output of latch connects the grid of the first switching tube and the grid of second switch pipe, the source ground of second switch pipe, the drain electrode of second switch pipe connects one end of the 3rd resistance, the other end of the 3rd resistance connects a second source, the source ground of the first switching tube, the drain electrode of the first switching tube connects one end of the 4th resistance and the grid of the 3rd switching tube, the other end of the 4th resistance connects one end and first power supply of the 5th resistance, the other end of the 5th resistance connects the drain electrode of the 3rd switching tube, one end of the 6th resistance and the 7th resistance, the source ground of the 3rd switching tube, the other end of the 6th resistance connects clock bus, the other end of the 7th resistance connects one end of the 8th resistance and the drain electrode of second switch pipe, the other end connection data bus of the 8th resistance, wherein, second source corresponding from equipment and the first power supply corresponding from equipment, be that the connected mode of same type two kinds are from equipment, and on second source, draw voltage be less than the first power supply on draw voltage.
The 4th kind of possible execution mode in conjunction with first aspect, in the 5th kind of possible execution mode, from equipment, by bus, be electrically connected to main equipment, circuit also comprises the 3rd power supply, the 4th switching tube and the 5th switching tube, the 4th switching tube is arranged on data/address bus, the 5th switching tube is arranged on clock bus, the grid of the 4th switching tube and the 5th switching tube receives the voltage of the 3rd power supply output, the source electrode of the 4th switching tube and the 5th switching tube is electrically connected to main equipment, and the drain electrode of the 4th switching tube and the 5th switching tube is electrically connected to from equipment.
The 5th kind of possible execution mode in conjunction with first aspect, in the 6th kind of possible execution mode, circuit also comprises the 4th power supply, the 9th resistance and the tenth resistance, one end of the 9th resistance and the tenth resistance receives the voltage of the 4th power supply output, and the other end of the 9th resistance and the tenth resistance is electrically connected to respectively data/address bus and clock bus.
In conjunction with the 6th kind of possible execution mode of first aspect, in the 7th kind of possible execution mode, comparator also comprises power end and earth terminal, and power end receives the first supply voltage, earth terminal ground connection.
In conjunction with the 4th kind of possible execution mode of first aspect, in the 8th kind of possible execution mode, branch pressure voltage be greater than second source on draw voltage, and be less than the first power supply on draw voltage.
Second aspect provides a kind of basis to adjust from the voltage that draws of equipment the method that bus is drawn voltage, and the method comprises the following steps:
Voltage to the first power supply output carries out dividing potential drop, and to obtain branch pressure voltage, wherein, the first power supply is the multiple power supply that draws magnitude of voltage maximum from equipment corresponding to the connected mode of same type;
Branch pressure voltage and from the size of drawing voltage of equipment relatively, and export comparative result;
According to comparative result output control signal, control the resistance of the pull-up resistor of access bus, draw voltage to equate with the voltage that draws in equipment on making that the pull-up resistor of bus forms, realize voltage matches, wherein, bus with from equipment, be electrically connected to.
In the possible execution mode of the first of second aspect, voltage to the first power supply output carries out dividing potential drop, to obtain the step of branch pressure voltage, further comprise: the branch pressure voltage that the voltage of the first power supply output is carried out to obtain after dividing potential drop be greater than second source on draw voltage, and be less than the first power supply on draw voltage; Wherein, second source corresponding from equipment and the first power supply corresponding from equipment be the connected mode of same type two kinds from equipment, and second source on draw voltage be less than the first power supply on draw voltage.
In conjunction with the possible execution mode of the first of second aspect, in the possible execution mode of the second, branch pressure voltage and from the size of drawing voltage of equipment relatively, and the step of exporting comparative result further comprises: when branch pressure voltage be greater than from equipment draw voltage time, comparative result is 0; When branch pressure voltage be less than from equipment draw voltage time, comparative result is 1.
In conjunction with the possible execution mode of the second of second aspect, in the third possible execution mode, according to the step of comparative result output control signal, further comprise: when comparative result is 1, output control signal 1; When comparative result is 0, output control signal 0.
In conjunction with the possible execution mode of the first of second aspect, in the 4th kind of possible execution mode, branch pressure voltage and from the size of drawing voltage of equipment relatively, and the step of exporting comparative result further comprises: when branch pressure voltage be greater than from equipment draw voltage time, comparative result is 1; When branch pressure voltage be less than from equipment draw voltage time, comparative result is 0.
In conjunction with the 4th kind of possible execution mode of second aspect, in the 5th kind of possible execution mode, according to the step of comparative result output control signal, further comprise: when comparative result is 1, output control signal 0; When comparative result is 0, output control signal 1.
The invention has the beneficial effects as follows: the situation that is different from prior art, the present invention carries out dividing potential drop by partial pressure unit to the voltage of the first power supply output, to obtain branch pressure voltage, comparator comparison branch pressure voltage and from the voltage that draws of equipment, and export comparative result, latch receives comparative result, and under the effect of a triggering signal, export the resistance of the pull-up resistor of control signal control group unit access bus, on making that the pull-up resistor of bus forms, draw voltage to equate with the voltage that draws from equipment, realize voltage matches.By the way, the present invention is according to drawing voltage to adjust bus to draw the circuit of voltage automatically to identify to draw voltage (being operating voltage) from equipment from equipment, and according to drawing voltage to carry out the type of judgment device on this, thereby automatically adjust bus on draw voltage, make bus on draw voltage to equate with the voltage that draws from equipment, thereby realize voltage matches.
Accompanying drawing explanation
Fig. 1 is that a kind of basis that the embodiment of the present invention provides adjusts from the voltage that draws of equipment the structured flowchart that bus is drawn the circuit of voltage;
Fig. 2 is that a kind of basis that the embodiment of the present invention provides adjusts from the voltage that draws of equipment the structural representation that bus is drawn the circuit of voltage;
Fig. 3 is that a kind of basis that the embodiment of the present invention provides is drawn the flow chart of the method for voltage from the voltage adjustment bus of drawing of equipment.
Embodiment
Refer to Fig. 1, Fig. 1 is that a kind of basis that the embodiment of the present invention provides adjusts from the voltage that draws of equipment the structured flowchart that bus is drawn the circuit of voltage.As shown in Figure 1, basis of the present invention draws voltage to adjust bus to draw the circuit 10 of voltage to comprise bus 11, partial pressure unit 12, comparator 13, latch 14, impedance unit 15 and from equipment 100 from equipment.
Wherein, from equipment 100, by bus 11, be electrically connected to main equipment 111.
The voltage of 12 pairs of the first power supply VSTB1 outputs of partial pressure unit carries out dividing potential drop, and to obtain branch pressure voltage, wherein, the first power supply VSTB1 is the multiple power supply that draws magnitude of voltage maximum from equipment 100 corresponding to the connected mode of same type.
The first input end 131 of comparator 13 receives branch pressure voltage, the voltage that draws that the second input 132 of comparator 13 receives from equipment 100 by bus 11, the output 133 output comparative results of comparator 13.
The first input end S of latch 14 receives comparative result, the second input C of latch 14 receives a triggering signal M, the resistance of the pull-up resistor of the output Q output control signal control group unit 15 access buses 11 of latch 14, on making that the pull-up resistor of bus 11 forms, draw voltage to equate with the voltage that draws from equipment 100, realize voltage matches.
In the present embodiment, voltage by 12 pairs of the first power supply VSTB1 outputs of partial pressure unit carries out dividing potential drop, to obtain branch pressure voltage, comparator 13 is branch pressure voltages and from the voltage that draws of equipment 100 relatively, and export comparative result, latch 14 is according to the resistance of the pull-up resistor of these comparative result control group unit 15 access buses 11, make according to drawing voltage to adjust bus to draw the circuit 10 of voltage automatically to identify to draw voltage (being operating voltage) from equipment 100 from equipment, and according to drawing voltage to judge from the type of equipment 100 on this, thereby automatically adjust the pull-up resistor of bus 11, on making that the pull-up resistor of bus 11 forms, draw voltage to equate with the voltage that draws from equipment 100, thereby realize voltage matches.
The embodiment of the present invention also provides another kind of basis to adjust from the voltage that draws of equipment the circuit that bus is drawn voltage, and it is to be described in detail on the basis of above-described embodiment.Wherein, the present embodiment according to from equipment draw voltage adjust bus draw the circuit 10 of voltage take to adjust two of bus 11 different draw magnitude of voltage, identification is not the same draws two kinds of voltage from equipment as example, to describe, should be understood that the present invention is not limited to this specific embodiment.
Specifically refer to Fig. 2, bleeder circuit 12 comprises the first resistance R 1 and the second resistance R 2, and bus 11 is preferably iic bus, and it comprises data/address bus DATA and clock bus CLK.One end of the first resistance R 1 connects the first power supply VSTB1, and the other end of the first resistance R 1 connects the second end ground connection of one end of the second resistance R 2 and the first input end of comparator 13 131, the second resistance R 2.The second input 132 of comparator 13 is electrically connected to data/address bus DATA.The output 133 of comparator 13 is electrically connected to the first input end S of latch 14.Comparator 13 also comprises power end and earth terminal, and wherein, power end connects the first power supply VSTB1, earth terminal ground connection.
Further, impedance unit 15 comprises the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q3, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8.Wherein, the output Q of latch 14 connects the grid of the first switching tube Q1 and the grid of second switch pipe Q2, the source ground of second switch pipe Q2, the drain electrode of second switch pipe Q2 connects one end of the 3rd resistance R 3, the other end of the 3rd resistance R 3 connects second source VSTB2, the source ground of the first switching tube Q1, the drain electrode of the first switching tube Q1 connects one end of the 4th resistance R 4 and the grid of the 3rd switching tube Q3, the other end of the 4th resistance R 4 connects one end and the first power supply VSTB1 of the 5th resistance R 5, the other end of the 5th resistance R 5 connects the drain electrode of the 3rd switching tube Q3, one end of the 6th resistance R 6 and the 7th resistance R 7, the source ground of the 3rd switching tube Q3, the other end of the 6th resistance R 6 connects clock bus CLK, the other end of the 7th resistance R 7 connects one end of the 8th resistance R 8 and the drain electrode of second switch pipe Q2, the other end connection data bus DATA of the 8th resistance R 8.
Wherein, second source VSTB2 corresponding from equipment 100 and the first power supply VSTB1 corresponding from equipment 100, be that the connected mode of same type two kinds are from equipment.And on second source VSTB2, draw voltage be less than the first power supply VSTB1 on draw voltage.
It should be noted that two kinds of the present embodiment identification voltage that draws that draws voltage and second source VSTB2 that draws voltage respectively with the first power supply VSTB1 from equipment 100 equates.
Further, basis of the present invention draws the circuit 10 of voltage also to comprise the 3rd power supply VSTB3, the 4th switching tube Q4 and the 5th switching tube Q5 from the voltage adjustment bus of drawing of equipment, the 4th switching tube Q4 is arranged on data/address bus DATA, the 5th switching tube Q5 is arranged on clock bus CLK, the grid of the 4th switching tube Q4 and the 5th switching tube Q5 receives the voltage of the 3rd power supply VSTB3 output, the drain electrode that the source electrode of the 4th switching tube Q4 and the 5th switching tube Q5 is electrically connected to main equipment 101, the four switching tube Q4 and the 5th switching tube Q5 is electrically connected to from equipment 100.Wherein, the voltage of the 3rd power supply VSTB3 is greater than the conducting voltage of the 4th switching tube Q4 and the conducting voltage of the 5th switching tube Q5, guarantees that the 4th switching tube Q4 and the 5th switching tube Q5 can work.The voltage of the 3rd power supply VSTB3 also must be less than data/address bus DATA on draw voltage, realize main equipment 101 and from the voltage isolation of equipment 100.Therefore, on data/address bus DATA, draw voltage equal the first power supply VSTB1 on while drawing voltage, the 3rd power supply VSTB3 also can substitute with second source VSTB2.
Further, basis of the present invention draws the circuit 10 of voltage also to comprise the 4th power supply VSTB4, the 9th resistance R 9 and the tenth resistance R 10 from the voltage adjustment bus of drawing of equipment, one end of the 9th resistance R 9 and the tenth resistance R 10 receives the voltage of the 4th power supply VSTB4 output, and the other end of the 9th resistance R 9 and the tenth resistance R 10 is electrically connected to respectively data/address bus DATA and clock bus CLK.Wherein, the 9th resistance R 9 and the tenth resistance R 10 be as the pull-up resistor of main equipment 101, and the voltage of the 4th power supply VSTB4 can be according to the requirement setting of main equipment 101, as long as can provide on enough and draw voltage to the 9th resistance R 9 and the tenth resistance R 10.
Below the voltage that draws of introducing according to from equipment is adjusted to the operation principle that bus is drawn the circuit 10 of voltage:
After circuit powers on and before bus 11 communication not yet starts, by the voltage that draws from equipment 100 on comparator 13 sampled data bus DATA, after the first power supply VSTB1 has powered on, the voltage of 12 pairs of the first power supply VSTB1 outputs of partial pressure unit carries out dividing potential drop, to obtain branch pressure voltage.Wherein, the branch pressure voltage that the first power supply VSTB1 obtains after dividing potential drop be less than the first power supply VSTB1 on draw voltage and be greater than second source VSTB2 on draw voltage.The size of drawing voltage and branch pressure voltage that comparator 13 compares from equipment 100.The first input end S of latch 14 receives the comparative result of comparator 13, and the second input R of latch 14 receives a triggering signal M, the comparative result of comparator 13 outputs is latched to output control signal.Impedance unit 15 is controlled the resistance of the pull-up resistor of access bus 11 according to the control signal of latch 14 output, draw voltage to equate with the voltage that draws from equipment 100 on making that the pull-up resistor of bus 11 forms, and realizes voltage matches.
Wherein, triggering signal M can be the PG signal of the first power supply VSTB1, can be also other triggering signal.The action that latch 14 latchs is only carried out when powering on for the first time, when bus 11 normal operation, is failure to actuate.
Further, the control signal of the comparative result of comparator 13 and latch 14 outputs can change along with the change of its connected mode separately, has following two kinds of situations:
The first situation: the first input end 131 of comparator 13 is negative input, the second input 132 of comparator 13 is positive input, and the output Q of latch 14 is in-phase output end, and connected mode is as shown in Figure 2;
The second situation: the first input end 131 of comparator 13 is positive input, the second input 132 of comparator 13 is negative input, the output Q of latch 14 is reversed-phase output, the non-end of Q as shown in Figure 2.
When the connected mode of comparator 13 and latch 14 belongs to the first situation, the specific works process of comparator 13 and latch 14 is as follows:
If the second input 132 of comparator 13 is to equate with the voltage that draws of the first power supply VSTB1 by the data/address bus DATA reception of bus 11 from the voltage that draws of equipment 100, on this, draw voltage to be greater than branch pressure voltage, comparator 131 outputs 1, if the data/address bus DATA of the second input 132 of comparator 13 by bus 11 receive from equipment 100 draw voltage be with second source VSTB2 draw voltage to equate time, on this, draw voltage to be less than branch pressure voltage, comparator 13 outputs 0.
When comparator 13 is output as 1, latch 14 is exported control signal 1 under the effect of triggering signal M, control the first switching tube Q1 and second switch pipe Q2 conducting, the 3rd switching tube Q3 cut-off, make the 3rd resistance R 3 by short circuit, now, the pull-up resistor of access bus 11 is the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8, because the 5th resistance R 5 now, the 6th resistance R 6, the driving voltage of the 7th resistance R 7 and the 8th resistance R 8 is the voltage of the first power supply VSTB1, therefore on accessing that the pull-up resistor of bus 11 forms, draw voltage and equate from the voltage that draws of equipment 10, realize the Auto-matching of voltage.
When comparator 13 is output as 0, latch 14 is exported control signal 0 under the effect of triggering signal M, controls the first switching tube Q1 and second switch pipe Q2 cut-off, and the 3rd switching tube Q3 is powered by the 4th resistance R 4 by the first power supply VSTB1, in conducting state, make the 5th resistance R 5 by short circuit.Now, the pull-up resistor of access bus 11 is the 3rd resistance R 3, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8, because now the driving voltage of the 3rd resistance R 3, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8 is the voltage of second source VSTB2, therefore on accessing that the pull-up resistor of bus 11 forms, draw voltage and equate from the voltage that draws of equipment 10, realizing the Auto-matching of voltage.
More than the connected mode of comparator 13 and latch 14 while belonging to the first situation, the specific works process of comparator 13 and latch 14.When the connected mode of comparator 13 and latch 14 belongs to the second situation, the specific works process of comparator 13 and latch 14 is as follows:
If the second input 132 of comparator 13 is to equate with the voltage that draws of the first power supply VSTB1 by the data/address bus DATA reception of bus 11 from the voltage that draws of equipment 100, on this, draw voltage to be greater than branch pressure voltage, comparator 131 outputs 0; If the data/address bus DATA of the second input 132 of comparator 13 by bus 11 receive from equipment 100 draw voltage be with second source VSTB2 draw voltage to equate time, on this, draw voltage to be less than branch pressure voltage, comparator 13 exports 1.
When comparator 13 is output as 0, latch 14 is reversed-phase output output control signal 1 under the effect of triggering signal M, control the first switching tube Q1 and second switch pipe Q2 conducting, the 3rd switching tube Q3 cut-off, make the 3rd resistance R 3 by short circuit, now, the pull-up resistor of access bus 11 is the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8, therefore on accessing that the pull-up resistor of bus 11 forms, draw voltage and equate from the voltage that draws of equipment 10, realizing the Auto-matching of voltage.
When comparator 13 is output as 1, latch 14 is reversed-phase output output control signal 0 under the effect of triggering signal M, control the first switching tube Q1 and second switch pipe Q2 cut-off, the 3rd switching tube Q3 is powered by the 4th resistance R 4 by the first power supply VSTB1, in conducting state, make the 5th resistance R 5 by short circuit.Now, the pull-up resistor of access bus 11 is the 3rd resistance R 3, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8, because now the driving voltage of the 3rd resistance R 3, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8 is the voltage of second source VSTB2, therefore on accessing that the pull-up resistor of bus 11 forms, draw voltage and equate from the voltage that draws of equipment 10, realizing the Auto-matching of voltage.
In the present embodiment, from the magnitude of voltage that draws of equipment 100, the first power supply VSTB1 or second source VSTB2 on to draw magnitude of voltage be by the type decided of main equipment 101.For example, when main equipment 101 is rack server, from the magnitude of voltage that draws of equipment 100, be two kinds of 5V or 3.3V.
In the present embodiment, voltage by 12 pairs of the first power supply VSTB1 outputs of partial pressure unit carries out dividing potential drop, to obtain branch pressure voltage, comparator 13 is branch pressure voltages and from the voltage that draws of equipment 100 relatively, and export comparative result, latch 14 is according to the resistance of the pull-up resistor of these comparative result control group unit 15 access buses 11, make according to drawing voltage to adjust bus to draw the circuit 10 of voltage automatically to identify to draw voltage (being operating voltage) from equipment 100 from equipment, and according to drawing voltage to judge from the type of equipment 100 on this, thereby automatically adjust the pull-up resistor of bus 11, on making that the pull-up resistor of bus 11 forms, draw voltage to equate with the voltage that draws from equipment 100, thereby realize voltage matches.
Further, when identification is not the same draw voltage two or more during from equipment, for example those are that PCIE slot and main equipment 101 by buckle or standard is electrically connected to from equipment, or multiple from equipment 100 can plug, IO power supply is various, or be electrically connected to the bus 11 of drawing on other need.The aforesaid embodiment according to the present invention, only needs the corresponding quantity that increases comparator 13, latch 14 and impedance unit 15, and its operation principle, with previously described identical, does not repeat them here.
The embodiment of the present invention also provides a kind of basis to draw the flow chart of the method for voltage from the voltage adjustment bus of drawing of equipment.It is from the voltage adjustment bus of drawing of equipment, to draw the basis of the circuit 10 of voltage to be described in detail in a kind of basis of previous embodiment.Refer to Fig. 3, according to the voltage adjustment bus of drawing from equipment, draw the method for voltage to comprise the following steps:
Step S1: the voltage to the first power supply VSTB1 output carries out dividing potential drop, to obtain branch pressure voltage.
The voltage of the first power supply VSTB1 output is carried out before dividing potential drop, first need to determine the magnitude of voltage of the first voltage source V STB1.Particularly, first determine main equipment 101 and connected mode type, the PCIE slot of buckle or standard for example, then determines according to the type of connected mode use this connected mode to be electrically connected to main equipment 101 multiple from equipment 100, comprises that definite those draw voltage from equipment 100.The present embodiment draws two kinds of voltage from equipment 100 as example, to describe by take not the same that embodiment exemplifies above.
When determining that not the same two kinds of voltage of drawing, from equipment 100, are the first power supply VSTB1 by drawing with two kinds of maximums from equipment 100 power settings that voltage is equal, by with another from equipment 100 to draw the power settings that voltage is equal be second source VSTB2.The first power supply VSTB1 is the multiple power supply that draws magnitude of voltage maximum from equipment corresponding to connected mode of same type.Second source VSTB2 corresponding from equipment and the first power supply VSTB1 corresponding from equipment be the connected mode of same type two kinds from equipment, and second source VSTB2 on draw voltage be less than the first power supply VSTB1 on draw voltage.
Further, the branch pressure voltage that the voltage of the first power supply VSTB1 output is carried out to obtain after dividing potential drop be greater than second source VSTB2 on draw voltage, and be less than the first power supply VSTB1 on draw voltage.
Step S2: branch pressure voltage and from the size of drawing voltage of equipment relatively, and export comparative result.
Comparative result has following two kinds of situations:
The first situation: when branch pressure voltage be greater than from equipment 100 draw voltage time, comparative result is 0, when branch pressure voltage be less than from equipment 100 draw voltage time, comparative result is 1;
The second situation: when branch pressure voltage be greater than from equipment 100 draw voltage time, comparative result is 1, when branch pressure voltage be less than from equipment 100 draw voltage time, comparative result is 0.
Step S3: control the resistance of the pull-up resistor of access bus according to comparative result output control signal, draw voltage to equate with the voltage that draws in equipment on making that the pull-up resistor of bus forms, realize voltage matches.
From above, the present embodiment determine two kinds voltage that draws that draws voltage and second source VSTB2 that draws voltage respectively with the first power supply VSTB1 from equipment 100 equates.
When comparative result is the first situation, be specially:
When comparative result is 1, illustrate that this voltage that draws that draws voltage and the first power supply VSTB1 from equipment 100 equates, export control signal 1, on controlling that pull-up resistor forms, draw voltage to draw voltage to equate with on the first power supply VSTB1;
When comparative result is 0, illustrate that this voltage that draws that draws voltage and second source VSTB2 from equipment 100 equates, export control signal 0, on controlling that pull-up resistor forms, draw voltage to draw voltage to equate with on second source VSTB2.
When comparative result is the second situation, be specially:
When comparative result is 1, illustrate that this voltage that draws that draws voltage and second source VSTB2 from equipment 100 equates, export control signal 0, on controlling that pull-up resistor forms, draw voltage to draw voltage to equate with on second source VSTB2;
When comparative result is 0, illustrate that this voltage that draws that draws voltage and the first power supply VSTB1 from equipment 100 equates, export control signal 1, on controlling that pull-up resistor forms, draw voltage to draw voltage to equate with on described the first power supply VSTB1.
Concrete control pull-up resistor form draw voltage principle as mentioned before, do not repeat them here.
In sum, the present invention carries out dividing potential drop by the voltage of 12 pairs of the first power supply VSTB1 outputs of partial pressure unit, to obtain branch pressure voltage, comparator 13 is branch pressure voltages and from the voltage that draws of equipment 100 relatively, and export comparative result, latch 14 is according to the resistance of the pull-up resistor of these comparative result control group unit 15 access buses 11, make according to drawing voltage to adjust bus to draw the circuit 10 of voltage automatically to identify to draw voltage (being operating voltage) from equipment 100 from equipment, and according to drawing voltage to judge from the type of equipment 100 on this, thereby automatically adjust the pull-up resistor of bus 11, on making that the pull-up resistor of bus 11 forms, draw voltage to equate with the voltage that draws from equipment 100, thereby realize voltage matches.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (15)
1. basis adjusts from the voltage that draws of equipment the circuit that bus is drawn voltage, it is characterized in that, described circuit comprises bus, partial pressure unit, comparator, latch and impedance unit, and described bus is electrically connected to from equipment with described, wherein:
Described partial pressure unit is carried out dividing potential drop to the voltage of the first power supply output, to obtain branch pressure voltage, and the multiple described power supply that draws magnitude of voltage maximum from equipment corresponding to connected mode that described the first power supply is same type;
The first input end of described comparator receives described branch pressure voltage, and the second input of described comparator receives the described voltage that draws from equipment by described bus, the output output comparative result of described comparator;
The first input end of described latch receives described comparative result, the second input of described latch receives a triggering signal, the output output control signal of described latch is controlled the resistance that described impedance unit accesses the pull-up resistor of described bus, on making that the pull-up resistor of described bus forms, draw voltage to equate with the described voltage that draws from equipment, realize voltage matches.
2. circuit according to claim 1, it is characterized in that, described bleeder circuit comprises the first resistance and the second resistance, one end of described the first resistance connects described the first power supply, the other end of described the first resistance connects one end of described the second resistance and the first input end of described comparator, the second end ground connection of described the second resistance.
3. circuit according to claim 2, is characterized in that, the first input end of described comparator is negative input, and the second input of described comparator is positive input, and the output of described latch is in-phase output end.
4. circuit according to claim 2, is characterized in that, the first input end of described comparator is positive input, and the second input of described comparator is negative input, and the output of described latch is reversed-phase output.
5. according to the circuit described in claim 3 or 4 any one, it is characterized in that, described bus comprises data/address bus and clock bus, described impedance unit comprises the first switching tube, second switch pipe, the 3rd switching tube, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, wherein, the output of described latch connects the grid of described the first switching tube and the grid of described second switch pipe, the source ground of described second switch pipe, the drain electrode of described second switch pipe connects one end of described the 3rd resistance, the other end of described the 3rd resistance connects a second source, the source ground of described the first switching tube, the drain electrode of described the first switching tube connects one end of described the 4th resistance and the grid of described the 3rd switching tube, the other end of described the 4th resistance connects one end and described first power supply of described the 5th resistance, the other end of described the 5th resistance connects the drain electrode of described the 3rd switching tube, one end of described the 6th resistance and described the 7th resistance, the source ground of described the 3rd switching tube, the other end of described the 6th resistance connects described clock bus, the other end of described the 7th resistance connects one end of described the 8th resistance and the drain electrode of described second switch pipe, the other end of described the 8th resistance connects described data/address bus, wherein, corresponding described of described second source is that the connected mode of same type two kinds are from equipment from equipment and corresponding described of described the first power supply from equipment, and on described second source, draw voltage be less than described the first power supply on draw voltage.
6. circuit according to claim 5, it is characterized in that, describedly from equipment, by described bus, be electrically connected to a main equipment, described circuit also comprises the 3rd power supply, the 4th switching tube and the 5th switching tube, described the 4th switching tube is arranged on described data/address bus, described the 5th switching tube is arranged on described clock bus, the grid of described the 4th switching tube and described the 5th switching tube receives the voltage of described the 3rd power supply output, the source electrode of described the 4th switching tube and described the 5th switching tube is electrically connected to described main equipment, the drain electrode of described the 4th switching tube and described the 5th switching tube is electrically connected to described from equipment.
7. according to the circuit shown in claim 6, it is characterized in that, described circuit also comprises the 4th power supply, the 9th resistance and the tenth resistance, one end of described the 9th resistance and described the tenth resistance receives the voltage of described the 4th power supply output, and the other end of described the 9th resistance and the tenth resistance is electrically connected to respectively described data/address bus and clock bus.
8. circuit according to claim 7, is characterized in that, described comparator also comprises power end and earth terminal, and described power end receives described the first supply voltage, described earth terminal ground connection.
9. circuit according to claim 5, is characterized in that, described branch pressure voltage be greater than described second source on draw voltage, and be less than described the first power supply on draw voltage.
10. basis adjusts from the voltage that draws of equipment the method that bus is drawn voltage, it is characterized in that, said method comprising the steps of:
Voltage to described the first power supply output carries out dividing potential drop, to obtain branch pressure voltage, wherein, the multiple described power supply that draws magnitude of voltage maximum from equipment corresponding to connected mode that described the first power supply is same type;
More described branch pressure voltage and the described size of drawing voltage from equipment, and export comparative result;
According to described comparative result output control signal, control the resistance of the pull-up resistor of access bus, on making that the pull-up resistor of described bus forms, draw voltage to equate with the described voltage that draws from equipment, realize voltage matches, wherein, described bus is electrically connected to from equipment with described.
11. methods according to claim 10, is characterized in that, the described voltage to described the first power supply output carries out dividing potential drop, to obtain the step of branch pressure voltage, further comprises:
The branch pressure voltage that the voltage of described the first power supply output is carried out to obtain after dividing potential drop be greater than second source on draw voltage, and be less than described the first power supply on draw voltage;
Wherein, described second source corresponding described from equipment and described the first power supply corresponding described from equipment be the connected mode of same type two kinds from equipment, and described second source on draw voltage be less than described the first power supply on draw voltage.
12. methods according to claim 11, is characterized in that, wherein, and described branch pressure voltage and the described size of drawing voltage from equipment, and the step of exporting comparative result further comprises:
When described branch pressure voltage be greater than described from equipment draw voltage time, described comparative result is 0;
When described branch pressure voltage be less than described from equipment draw voltage time, described comparative result is 1.
13. methods according to claim 12, is characterized in that, the described step according to described comparative result output control signal further comprises:
When described comparative result is 1, output control signal 1;
When described comparative result is 0, output control signal 0.
14. methods according to claim 11, is characterized in that, described branch pressure voltage and the described size of drawing voltage from equipment, and the step of exporting comparative result further comprises:
When described branch pressure voltage be greater than described from equipment draw voltage time, described comparative result is 1;
When described branch pressure voltage be less than described from equipment draw voltage time, described comparative result is 0.
15. methods according to claim 14, is characterized in that, the described step according to described comparative result output control signal further comprises:
When described comparative result is 1, output control signal 0;
When described comparative result is 0, output control signal 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310530312.9A CN103546114B (en) | 2013-10-30 | 2013-10-30 | Circuit according to pull-up voltage in the pull-up Voltage Cortrol bus of equipment and method thereof |
| PCT/CN2014/078370 WO2015062261A1 (en) | 2013-10-30 | 2014-05-26 | Circuit for adjusting pull-up voltage of bus according to pull-up voltage of slave device, and method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310530312.9A CN103546114B (en) | 2013-10-30 | 2013-10-30 | Circuit according to pull-up voltage in the pull-up Voltage Cortrol bus of equipment and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103546114A true CN103546114A (en) | 2014-01-29 |
| CN103546114B CN103546114B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310530312.9A Active CN103546114B (en) | 2013-10-30 | 2013-10-30 | Circuit according to pull-up voltage in the pull-up Voltage Cortrol bus of equipment and method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103546114B (en) |
| WO (1) | WO2015062261A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015062261A1 (en) * | 2013-10-30 | 2015-05-07 | 华为技术有限公司 | Circuit for adjusting pull-up voltage of bus according to pull-up voltage of slave device, and method therefor |
| WO2016123970A1 (en) * | 2015-02-06 | 2016-08-11 | 中兴通讯股份有限公司 | Communication card having adjustable pull-up voltage |
| CN109612598A (en) * | 2018-12-14 | 2019-04-12 | 华南理工大学 | A kind of temperature sensing circuit and method |
| CN110912791A (en) * | 2019-11-07 | 2020-03-24 | 苏州浪潮智能科技有限公司 | System management bus link and pull-up resistance determination method, device and equipment thereof |
| CN114817104A (en) * | 2022-04-20 | 2022-07-29 | 苏州浪潮智能科技有限公司 | IIC pull-up voltage switching circuit and switching method |
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| US6411330B1 (en) * | 1998-06-10 | 2002-06-25 | Analog Devices, Inc. | Method and a circuit for detecting the presence of a television or other device on the output of a video digital to analog converter |
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| CN101126788A (en) * | 2006-08-18 | 2008-02-20 | 威华电子股份有限公司 | Inserting bolt type test lead checking circuit and its method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546114B (en) * | 2013-10-30 | 2016-08-24 | 华为技术有限公司 | Circuit according to pull-up voltage in the pull-up Voltage Cortrol bus of equipment and method thereof |
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- 2013-10-30 CN CN201310530312.9A patent/CN103546114B/en active Active
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| US6411330B1 (en) * | 1998-06-10 | 2002-06-25 | Analog Devices, Inc. | Method and a circuit for detecting the presence of a television or other device on the output of a video digital to analog converter |
| CN1900923A (en) * | 2005-08-19 | 2007-01-24 | 威盛电子股份有限公司 | Adjustable termination resistor for integrated circuit chip |
| CN101126788A (en) * | 2006-08-18 | 2008-02-20 | 威华电子股份有限公司 | Inserting bolt type test lead checking circuit and its method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015062261A1 (en) * | 2013-10-30 | 2015-05-07 | 华为技术有限公司 | Circuit for adjusting pull-up voltage of bus according to pull-up voltage of slave device, and method therefor |
| WO2016123970A1 (en) * | 2015-02-06 | 2016-08-11 | 中兴通讯股份有限公司 | Communication card having adjustable pull-up voltage |
| CN109612598A (en) * | 2018-12-14 | 2019-04-12 | 华南理工大学 | A kind of temperature sensing circuit and method |
| CN109612598B (en) * | 2018-12-14 | 2019-08-30 | 华南理工大学 | A kind of temperature sensing circuit and method |
| CN110912791A (en) * | 2019-11-07 | 2020-03-24 | 苏州浪潮智能科技有限公司 | System management bus link and pull-up resistance determination method, device and equipment thereof |
| CN110912791B (en) * | 2019-11-07 | 2021-06-29 | 苏州浪潮智能科技有限公司 | System management bus link and pull-up resistance determination method, device and equipment thereof |
| CN114817104A (en) * | 2022-04-20 | 2022-07-29 | 苏州浪潮智能科技有限公司 | IIC pull-up voltage switching circuit and switching method |
| CN114817104B (en) * | 2022-04-20 | 2023-07-14 | 苏州浪潮智能科技有限公司 | IIC pull-up voltage switching circuit and switching method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103546114B (en) | 2016-08-24 |
| WO2015062261A1 (en) | 2015-05-07 |
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