CN108767828A - DA powers on anti-impact circuit in a kind of microcontroller - Google Patents
DA powers on anti-impact circuit in a kind of microcontroller Download PDFInfo
- Publication number
- CN108767828A CN108767828A CN201810803806.2A CN201810803806A CN108767828A CN 108767828 A CN108767828 A CN 108767828A CN 201810803806 A CN201810803806 A CN 201810803806A CN 108767828 A CN108767828 A CN 108767828A
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- field
- effect tube
- microcontroller
- resistor
- reset
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- 230000005669 field effect Effects 0.000 claims abstract description 42
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 101100520142 Caenorhabditis elegans pin-2 gene Proteins 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 101150037009 pin1 gene Proteins 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- 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 DA in a kind of microcontroller to power on anti-impact circuit, its key points of the technical solution are that including reset chip, first resistor, second resistance, capacitance, first field-effect tube, second field-effect tube, the power end of the reset chip connects 3.3V power supplys, ground terminal is grounded, reset output terminal connects the reset terminal of microcontroller, the reset output terminal of the grid connection reset chip of first field-effect tube, the source electrode of first field-effect tube connects 3.3V power supplys, one end of first resistor connects the drain electrode of the first field-effect tube, it is grounded after the other end series capacitance of first resistor, the source electrode of second field-effect tube is grounded, grid connects the drain electrode of the first field-effect tube, the DA output channels of the drain electrode connection microcontroller of second field-effect tube.DA powers on anti-impact circuit precision height in a kind of microcontroller of the present invention, simple in structure, easy to use.
Description
Technical field
The present invention relates to DA in a kind of microcontroller to power on anti-impact circuit.
Background technology
Modern MCU system pin, to avoid malfunctioning late-class circuit, it is defeated to generally lie in high resistant before reset and initialization
Enter state.The working condition is at some in application, interference signal still can be exported to late-class circuit, such as using in single chip microcomputer
When DAC, during reset, the output of DA is high-impedance state, is easy to be interfered by outer signals, causes late-class circuit output uncertain, makes
At product in the interference output of pulse signal for powering on the moment.
Conventional solution：
1. using relay, after system worked well, it is closed contact, connects DA signals,
Disadvantage：Using relay, cost increase, program is caused to control complexity and increase.
2. by DA output pins outer connecting resistance over the ground,
Disadvantage：Remove interference effect for what is reached, need using the smaller resistance of resistance value, and it is normal when, in piece the internal resistance of DA add
Greatly, therefore DA outputs are output to late-class circuit after electric resistance partial pressure, cause practical DA out reach to become smaller, reduce DA's
Precision.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of precision height, simple in structure, user
Just DA powers on anti-impact circuit in microcontroller.
To achieve the above object, the present invention provides following technical solutions：DA powers on protecting against shock in a kind of microcontroller
Circuit, including reset chip, first resistor, second resistance, capacitance, the first field-effect tube, the second field-effect tube, the reset coil
The power end of piece connects 3.3V power supplys, ground terminal ground connection, and reset output terminal connects the reset terminal of microcontroller, the first field-effect tube
Grid connection reset chip reset output terminal, the source electrode of the first field-effect tube connects 3.3V power supplys, one end of first resistor
The drain electrode of the first field-effect tube is connected, is grounded after the other end series capacitance of first resistor, the source electrode ground connection of the second field-effect tube,
Grid connects the drain electrode of the first field-effect tube, the DA output channels of the drain electrode connection microcontroller of the second field-effect tube.
The present invention is further arranged to：The anti-impact circuit further includes having 3rd resistor, and the one of the 3rd resistor
The DA output channels of end connection microcontroller, the other end of 3rd resistor connect the drain electrode of the second field-effect tube.
The present invention is further arranged to：Second field-effect tube is at least provided with one, according to the DA on microcontroller
Corresponding second field-effect tube is arranged in output channel quantity.
The present invention is further arranged to：The 3rd resistor be provided with it is multiple, according to the DA output channels on microcontroller
Corresponding 3rd resistor is arranged in quantity.
The present invention is further arranged to：The resistance value of the first resistor is 470-2K Ω.
The present invention is further arranged to：The resistance value of the second resistance is 51K-200K Ω.
The present invention is further arranged to：The value of the capacitance is 1u-10uF.
Present invention tool has the advantage that：The interference pulse that electronic product is efficiently solved in the DA outputs for powering on the moment is believed
Number output, improve product signal output accuracy, reduce late-class circuit malfunction.
Description of the drawings
Fig. 1 is the circuit diagram of the present invention.
In figure：1, reset chip；2, first resistor；3, second resistance；4, capacitance；5, the first field-effect tube；6, second
Effect pipe；7,3rd resistor；8, microcontroller.
Specific implementation mode
Shown in referring to Fig.1, DA powers on anti-impact circuit in a kind of microcontroller of the present embodiment, including reset chip 1,
The power end of first resistor 2, second resistance 3, capacitance 4, the first field-effect tube 5, the second field-effect tube 6, the reset chip 1 connects
3.3V power supplys, ground terminal ground connection are connect, reset output terminal connects the reset terminal of microcontroller 8, the grid connection of the first field-effect tube 5
The source electrode of the reset output terminal of reset chip 1, the first field-effect tube 5 connects 3.3V power supplys, one end connection first of first resistor 2
The drain electrode of field-effect tube 5 is grounded after the other end series capacitance 4 of first resistor 2, the source electrode ground connection of the second field-effect tube 6, grid
Connect the drain electrode of the first field-effect tube 5, the DA output channels of the drain electrode connection microcontroller 8 of the second field-effect tube 6.
The anti-impact circuit further includes having 3rd resistor 7, one end connection microcontroller 8 of the 3rd resistor 7
DA output channels, the other end of 3rd resistor 7 connect the drain electrode of the second field-effect tube 6.
Second field-effect tube 6 is at least provided with one, according to the DA output channel quantity on microcontroller 8, setting
Corresponding second field-effect tube 6.
The 3rd resistor 7 be provided with it is multiple, according to the DA output channel quantity on microcontroller 8, setting corresponding the
Three resistance 7.
The resistance value of the first resistor 2 is 470-2K Ω.
The resistance value of the second resistance 3 is 51K-200K Ω.
The value of the capacitance 4 is 1u-10uF.
By using above-mentioned technical proposal, resets IC U1 pin3 and connect power supply, pin1 ground connection, pin2 resets output and connects all the way
8 resetting pin of microcontroller, another way connect Q0 grids, and Q0 source electrodes connect the source electrode ground connection of 3.3V power supplys, Q1, Q2, QN, the drain electrode of Q0 with
The grid of Q1, Q2, QN connect, while one end of connecting resistance R1, R2, resistance R2 other ends ground connection, another termination capacitors of resistance R1
The one end 4C1, C1 other ends ground connection；The DA that the drain electrode of Q1, Q2, QN connect microcontroller 8 respectively after current-limiting resistance R3, R4, RN is defeated
Go out channel 1, DA output channels 2, DA output channels N；Another way connects respective late-class circuit 1, rear class respectively for the drain electrode of Q1, Q2, QN
Circuit 2, late-class circuit N.
When powering on, resets ICpin2 and reset output low level, Q0, Q1, Q2, QN conducting export DA output channels 1, DA
Channel 2, DA output channels N, late-class circuit 1, late-class circuit 2, late-class circuit N are respectively grounded respectively, while to C1 through R1 current limlitings
After charge.
After reset, resetting ICpin2 and reset output high level, Q0 cut-offs, C1 discharges through R1, R2, Q1 during electric discharge,
Q2, QN continue to be connected, and microcontroller completes initial work, complete delivery outlet setting.
After C1 discharges, Q1, Q2, QN cut-off, DA output channels normally connect respective late-class circuit, work normally.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
1. DA powers on anti-impact circuit in a kind of microcontroller, it is characterised in that：Including reset chip, first resistor, second
The power end of resistance, capacitance, the first field-effect tube, the second field-effect tube, the reset chip connects 3.3V power supplys, ground connection termination
Ground, reset output terminal connect the reset terminal of microcontroller, and the grid of the first field-effect tube connects the reset output terminal of reset chip,
The source electrode of first field-effect tube connects 3.3V power supplys, and one end of first resistor connects the drain electrode of the first field-effect tube, first resistor
Other end series capacitance after be grounded, the source electrode of the second field-effect tube ground connection, grid connect the drain electrode of the first field-effect tube, second
The DA output channels of the drain electrode connection microcontroller of field-effect tube.
2. DA powers on anti-impact circuit in a kind of microcontroller according to claim 1, it is characterised in that：Described is anti-
It further includes having 3rd resistor to impact circuit, the DA output channels of one end connection microcontroller of the 3rd resistor, 3rd resistor
The other end connect the second field-effect tube drain electrode.
3. DA powers on anti-impact circuit in a kind of microcontroller according to claim 2, it is characterised in that：Described second
At least provided with one, according to the DA output channel quantity on microcontroller, corresponding second field-effect tube is arranged in field-effect tube.
4. DA powers on anti-impact circuit in a kind of microcontroller according to claim 3, it is characterised in that：The third
Resistance is provided with multiple, and according to the DA output channel quantity on microcontroller, corresponding 3rd resistor is arranged.
5. DA powers on anti-impact circuit in a kind of microcontroller according to claim 1, it is characterised in that：Described first
The resistance value of resistance is 470-2K Ω.
6. DA powers on anti-impact circuit in a kind of microcontroller according to claim 1, it is characterised in that：Described second
The resistance value of resistance is 51K-200K Ω.
7. DA powers on anti-impact circuit in a kind of microcontroller according to claim 1, it is characterised in that：The capacitance
Value be 1u-10uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810803806.2A CN108767828A (en) | 2018-07-20 | 2018-07-20 | DA powers on anti-impact circuit in a kind of microcontroller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810803806.2A CN108767828A (en) | 2018-07-20 | 2018-07-20 | DA powers on anti-impact circuit in a kind of microcontroller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108767828A true CN108767828A (en) | 2018-11-06 |
Family
ID=63971022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810803806.2A Pending CN108767828A (en) | 2018-07-20 | 2018-07-20 | DA powers on anti-impact circuit in a kind of microcontroller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108767828A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212216A (en) * | 2006-12-29 | 2008-07-02 | 鸿富锦精密工业（深圳）有限公司 | Delay circuit |
| US20090268360A1 (en) * | 2008-04-25 | 2009-10-29 | Hitachi, Ltd. | Protection circuit |
| CN102637054A (en) * | 2012-04-21 | 2012-08-15 | 吉林大学 | 50-ampere power consumption balanced-type high-power constant-current source |
| CN204012273U (en) * | 2014-08-02 | 2014-12-10 | 温州金象电器设备有限公司 | Dust-proof switch cabinet |
| CN208782468U (en) * | 2018-07-20 | 2019-04-23 | 浙江机电职业技术学院 | DA powers on anti-impact circuit in a kind of microcontroller |
-
2018
- 2018-07-20 CN CN201810803806.2A patent/CN108767828A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212216A (en) * | 2006-12-29 | 2008-07-02 | 鸿富锦精密工业（深圳）有限公司 | Delay circuit |
| US20090268360A1 (en) * | 2008-04-25 | 2009-10-29 | Hitachi, Ltd. | Protection circuit |
| CN102637054A (en) * | 2012-04-21 | 2012-08-15 | 吉林大学 | 50-ampere power consumption balanced-type high-power constant-current source |
| CN204012273U (en) * | 2014-08-02 | 2014-12-10 | 温州金象电器设备有限公司 | Dust-proof switch cabinet |
| CN208782468U (en) * | 2018-07-20 | 2019-04-23 | 浙江机电职业技术学院 | DA powers on anti-impact circuit in a kind of microcontroller |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181106 |