CN108736458B - DA power-on anti-impact circuit in multichannel microcontroller chip - Google Patents
DA power-on anti-impact circuit in multichannel microcontroller chip Download PDFInfo
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- CN108736458B CN108736458B CN201810800006.5A CN201810800006A CN108736458B CN 108736458 B CN108736458 B CN 108736458B CN 201810800006 A CN201810800006 A CN 201810800006A CN 108736458 B CN108736458 B CN 108736458B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
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Abstract
The invention discloses a DA power-on anti-impact circuit in a multichannel microcontroller chip, which comprises: resetting the chip U1; the grid electrode of the field effect tube Q0 is connected with the RST pin of the reset chip U1, and the drain electrode of the field effect tube Q0 is connected with a VCC power supply; the grid of the field effect transistor Q1 is connected with the source electrode of the field effect transistor Q0, and the drain electrode of the field effect transistor Q1 is connected with a VCC power supply; one end of the resistor R2 is connected with the source electrode of the field effect transistor Q0, and the other end of the resistor R is grounded to GND; one end of the resistor R1 is connected with the source electrode of the field effect transistor Q0, and the other end of the resistor R1 is connected with the capacitor C1 in series and then grounded GND; the microcontroller is connected with the rear-stage circuit 1, the rear-stage circuit 2 and the rear-stage circuit N through resistors R3, R4 and RN respectively by the DA output channel 1, the DA output channel 2 and the DA output channel N; the driving chip U2 is ULQ2003ADR, a plurality of input pins of the driving chip U2 are connected with the source electrode of the field effect transistor Q1, and output pins of the driving chip U2 are respectively connected with the rear-stage circuit 1, the rear-stage circuit 2 and the rear-stage circuit N. The beneficial effects of the invention are as follows: when the multi-channel DAC output circuit is applied, the number of electronic elements is reduced, and the circuit is simplified.
Description
Technical Field
The invention relates to a DA power-on anti-impact circuit in a multichannel microcontroller chip, which is applied to the application occasions of DAC in the controller chip, such as DAC output channels of a PLC, DAC output channels of a data acquisition card and the like.
Background
For the DA power-on anti-impact circuit formed by discrete components, the circuit scale is too complex in multipath signals, and the conventional solution is as follows:
1. after the system works normally, the relay is adopted to close the contact and switch on the DA signal, and the defect is that: the use of relays leads to an increase in cost and complexity of program control.
2. The DA output pin is externally connected with the resistor to the ground, and the defect is that: in order to achieve a good interference elimination effect, a resistor with a smaller resistance value is required to be used, and in normal times, the internal resistance of the DA in the chip is larger, so that DA output is output to a later-stage circuit after being divided by the resistor, the effective range of actual DA output is reduced, and the DA precision is reduced.
Disclosure of Invention
According to the defects, the invention provides a DA power-on anti-impact circuit in a multichannel microcontroller chip, and the invention provides a solution adopting a multichannel IC driving chip.
The technical scheme of the invention is as follows:
a multi-channel microcontroller on-chip DA power-on anti-shock circuit comprising:
the reset chip U1, its VCC foot connects VCC power, GND foot connects GND;
the grid electrode of the field effect tube Q0 is connected with the RST pin of the reset chip U1, and the drain electrode of the field effect tube Q0 is connected with a VCC power supply;
the grid of the field effect transistor Q1 is connected with the source electrode of the field effect transistor Q0, and the drain electrode of the field effect transistor Q1 is connected with a VCC power supply;
one end of the resistor R2 is connected with the source electrode of the field effect transistor Q0, and the other end of the resistor R is grounded to GND;
one end of the resistor R1 is connected with the source electrode of the field effect transistor Q0, and the other end of the resistor R1 is connected with the capacitor C1 in series and then grounded GND;
the reset pin of the microcontroller is connected with the RST pin of the reset chip U1, the DA output channel 1 is connected with the post-stage circuit 1 through a resistor R3, the DA output channel 2 is connected with the post-stage circuit 2 through a resistor R4, and the DA output channel N is connected with the post-stage circuit N through a resistor RN;
the driving chip U2 is ULQ2003ADR, a plurality of input pins of the driving chip are connected with the source electrode of the field effect transistor Q1, and output pins of the driving chip U2 are respectively connected with the pins of the rear-stage circuit 1, the rear-stage circuit 2 and the rear-stage circuit N, COM and are connected with a VCC power supply and a GND pin to be grounded GND.
The field effect transistor Q0 is A3401.
The field effect transistor Q1 is BSS138.
The reset chip U1 is CAT809.
The beneficial effects of the invention are as follows: when the multi-channel DAC output circuit is applied, the interference pulse signal output of DA output of an electronic product at the power-on time can be effectively solved, compared with a discrete element scheme, the number of electronic elements is reduced, and the circuit is simplified.
Drawings
Fig. 1 is an electrical schematic of the present invention.
Description of the embodiments
The invention will now be further described with reference to the accompanying drawings:
as shown, a DA power-on anti-shock circuit in a multi-channel microcontroller chip includes:
the model U1 of the reset chip is CAT809, the VCC pin of the reset chip is connected with a VCC power supply, and the GND pin is connected with the GND;
the model of the field effect transistor Q0 is A3401, the grid electrode of the field effect transistor Q0 is connected with the RST pin of the reset chip U1, and the drain electrode of the field effect transistor Q0 is connected with a VCC power supply;
the model of the field effect transistor Q1 is BSS138, the grid electrode of the field effect transistor Q1 is connected with the source electrode of the field effect transistor Q0, and the drain electrode of the field effect transistor Q0 is connected with a VCC power supply;
one end of the resistor R2 is connected with the source electrode of the field effect transistor Q0, and the other end of the resistor R2 is grounded to GND;
one end of the resistor R1 has a resistance value of 1.2K, is connected with the source electrode of the field effect transistor Q0, and the other end is connected with the capacitor C1 in series with a capacitance value of 10 mu F and then is grounded to GND;
the reset pin of the microcontroller is connected with the RST pin of the reset chip U1, the DA output channel 1 is connected with the post-stage circuit 1 through a resistor R3, the DA output channel 2 is connected with the post-stage circuit 2 through a resistor R4, and the DA output channel N is connected with the post-stage circuit N through a resistor RN;
the driving chip U2 is ULQ2003ADR, a plurality of input pins IN1 to IN7 of the driving chip are connected with the source electrode of the field effect transistor Q1, the output pins OUT1 to OUT7 of the driving chip U2 are respectively connected with the post-stage circuit 1, the post-stage circuit 2 and the post-stage circuit N, COM, the pins of the driving chip U2 are connected with a VCC power supply, the pins GND are grounded GND, three paths are provided IN the embodiment, and the driving chip U2 has seven channels and can respectively control seven post-stage circuits and DA output channels.
The working principle of the invention is as follows:
when the power-on is performed, the RST pin of the reset chip U1 outputs a high level, the field effect transistors Q0 and Q1 are conducted, the driving chip U2 inputs a high level, the output low level is conducted, the DA output channel 1, the DA output channel 2, the DA output channel N, the post-stage circuit 1, the post-stage circuit 2 and the post-stage circuit N are respectively grounded, and meanwhile, the capacitor C1 is charged after being limited by the resistor R1.
After the reset is finished, the RST pin of the reset chip U1 outputs a low level, the field effect transistor Q0 is cut off, the capacitor C1 discharges through the resistors R1 and R2, the field effect transistor Q1 and the driving chip U2 continue to be conducted during the discharging period, and the microcontroller completes the initialization work and completes the setting of an output port.
After the capacitor C1 is discharged, the output of the field effect transistor Q1 and the output of the driving chip U2 are cut off, and the DA output channel is normally connected with the respective subsequent-stage circuits and works normally.
Claims (4)
1. A DA power-on anti-impact circuit in a multichannel microcontroller chip is characterized by comprising:
the reset chip U1, its VCC foot connects VCC power, GND foot connects GND;
the grid electrode of the field effect tube Q0 is connected with the RST pin of the reset chip U1, and the drain electrode of the field effect tube Q0 is connected with a VCC power supply;
the grid of the field effect transistor Q1 is connected with the source electrode of the field effect transistor Q0, and the drain electrode of the field effect transistor Q1 is connected with a VCC power supply;
one end of the resistor R2 is connected with the source electrode of the field effect transistor Q0, and the other end of the resistor R is grounded to GND;
one end of the resistor R1 is connected with the source electrode of the field effect transistor Q0, and the other end of the resistor R1 is connected with the capacitor C1 in series and then grounded GND;
the reset pin of the microcontroller is connected with the RST pin of the reset chip U1, the DA output channel 1 is connected with the post-stage circuit 1 through a resistor R3, the DA output channel 2 is connected with the post-stage circuit 2 through a resistor R4, and the DA output channel N is connected with the post-stage circuit N through a resistor RN;
the driving chip U2 is ULQ2003ADR, a plurality of input pins of the driving chip are connected with the source electrode of the field effect transistor Q1, the output pins of the driving chip are respectively connected with the pins of the rear-stage circuit 1, the rear-stage circuit 2 and the rear-stage circuit N, COM, and the pins of the driving chip are connected with a VCC power supply and a GND pin to be grounded GND;
when power is on, the RST pin of the reset chip U1 outputs a high level, the field effect transistor Q0 and the field effect transistor Q1 are conducted, the driving chip U2 inputs the high level, the output low level is conducted, the DA output channel 1, the DA output channel 2, the DA output channel N, the post-stage circuit 1, the post-stage circuit 2 and the post-stage circuit N are respectively grounded, and meanwhile, the capacitor C1 is charged after being limited by the resistor R1;
after the reset is finished, the RST pin of the reset chip U1 outputs a low level, the field effect transistor Q0 is cut off, the capacitor C1 discharges through the resistor R1 and the resistor R2, the field effect transistor Q1 and the driving chip U2 continue to be conducted during the discharging period, and the microcontroller completes the initialization work and completes the setting of an output port;
after the capacitor C1 is discharged, the output of the field effect transistor Q1 and the output of the driving chip U2 are cut off, and the DA output channel is normally connected with the respective subsequent-stage circuits and works normally.
2. The DA power-on anti-shock circuit of claim 1, wherein said fet Q0 is a3401.
3. The DA power-on anti-shock circuit of claim 1, wherein said fet Q1 is BSS138.
4. The DA power-on anti-shock circuit of claim 1, wherein said reset chip U1 is CAT809.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810800006.5A CN108736458B (en) | 2018-07-20 | 2018-07-20 | DA power-on anti-impact circuit in multichannel microcontroller chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810800006.5A CN108736458B (en) | 2018-07-20 | 2018-07-20 | DA power-on anti-impact circuit in multichannel microcontroller chip |
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| Publication Number | Publication Date |
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| CN108736458A CN108736458A (en) | 2018-11-02 |
| CN108736458B true CN108736458B (en) | 2023-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810800006.5A Active CN108736458B (en) | 2018-07-20 | 2018-07-20 | DA power-on anti-impact circuit in multichannel microcontroller chip |
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| CN104901666A (en) * | 2015-05-20 | 2015-09-09 | 广州金升阳科技有限公司 | IGBT driving protection circuit, driver chip with circuit and protection circuit for chip |
| CN105334779A (en) * | 2015-11-30 | 2016-02-17 | 国网浙江省电力公司绍兴供电公司 | Intelligent communication measurement and control device and debugging method thereof |
| CN105867523A (en) * | 2015-01-20 | 2016-08-17 | 鸿富锦精密工业(武汉)有限公司 | Discharging circuit and mainboard using same |
| CN208690924U (en) * | 2018-07-20 | 2019-04-02 | 浙江机电职业技术学院 | DA powers on anti-impact circuit in multichannel microcontroller |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5044448B2 (en) * | 2008-03-03 | 2012-10-10 | ルネサスエレクトロニクス株式会社 | Power switch circuit |
| JP2009267072A (en) * | 2008-04-25 | 2009-11-12 | Hitachi Ltd | Protection circuit |
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2018
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| CN204118721U (en) * | 2014-11-06 | 2015-01-21 | 大全集团有限公司 | A kind of electronic trip unit power supply energy is released analogue load circuit and management circuit of releasing |
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| CN104901666A (en) * | 2015-05-20 | 2015-09-09 | 广州金升阳科技有限公司 | IGBT driving protection circuit, driver chip with circuit and protection circuit for chip |
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