CN2708377Y - Single-chip microcomputer reset circuit - Google Patents
Single-chip microcomputer reset circuit Download PDFInfo
- Publication number
- CN2708377Y CN2708377Y CN 200420071351 CN200420071351U CN2708377Y CN 2708377 Y CN2708377 Y CN 2708377Y CN 200420071351 CN200420071351 CN 200420071351 CN 200420071351 U CN200420071351 U CN 200420071351U CN 2708377 Y CN2708377 Y CN 2708377Y
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- CN
- China
- Prior art keywords
- reset circuit
- reset
- circuit
- voltage
- scm
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a single-chip microcomputer reset circuit, comprising a monitoring unit used for monitoring the variation of working voltage and an output unit used for outputting reset electrical level. The single-chip microcomputer reset circuit also comprises a time-delay capacitor and an electric discharge diode. The monitoring unit mainly comprises a zener diode for causing a reset electric circuit to have stable jump threshold voltage. The single-chip microcomputer reset circuit not only can solve that power supply sentus causes system to be unstable, but also can reset reliably when the power supply decreases slowly (the shortage of battery voltage), the projecting advantage is that the jump threshold voltage of the reset circuit is not affected by a system power supply, and the application system of a single-chip microcomputer can reset reliably. The circuit utilizes a discrete component to substitute a traditional integrated chip, and the circuit is simple with low cost.
Description
Technical field
The utility model relates to single chip circuit, specifically, relates to a kind of reset circuit of SCM that carries out under-voltage protection in the scm application system that is applicable to.
Background technology
In scm application system; power supply burr or brownout can cause system's operation disorderly; even system itself caused damage; therefore in scm application system, generally be provided with the reset circuit unit of under-voltage protection; working power voltage is monitored; can trigger the reset circuit cell operation and produce a reset signal when a predetermined lowest limit voltage or power supply produce the burr of certain width when supply voltage drops to, make system out of service and be returned to a certain original state.Traditional reset circuit unit adopts the RC reset circuit or realizes with integrated circuit (IC) chip.Problems such as (for example, cell voltage deficiencies) that these two kinds of reset circuits can't resolve the power supply burr and power supply slowly descends; Forming the reset circuit of bleeder circuit can monitor relatively power supply with resistance, but the saltus step threshold voltage is subjected to the major defect that the influence of power supply is this reset circuit.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of reset circuit of SCM, can effectively solve the problem that above three kinds of reset circuits exist, guarantee reliable reset when the power supply burr and the power supply of certain width slowly descend (cell voltage deficiency), and make reset circuit saltus step threshold voltage not influenced by power supply.
The above-mentioned technical matters of the utility model solves like this, constructs a kind of reset circuit of SCM, comprises monitoring means that is used for the monitoring change in voltage and the output unit that is used to export reset level and delay capacitor C
2With discharge diode D
1, described monitoring means comprises voltage stabilizing diode Z
1With current-limiting resistance R
1, described output unit comprises transistor Q
1With current-limiting resistance R
2And the filter capacitor C that avoids high-frequency harmonic that circuit is disturbed
1, described discharge diode D
1Be switching diode.
In the reset circuit of SCM that provides according to the utility model, it is characterized in that the saltus step threshold voltage U of reset circuit
tBe U
z+ 0.7V, wherein, U
zBe described voltage stabilizing diode Z
1Stable voltage, be lower than threshold voltage U when supply voltage drops to
tThe time, described transistor Q
1End the high level signal that described reset circuit output terminal output resets single-chip microcomputer.
In the reset circuit of SCM that provides according to the utility model, it is characterized in that described reset circuit threshold voltage U
tBe stabilized in U
z+ 0.7V selects different stabilivolts promptly can change threshold voltage.
Reset circuit of SCM providing according to the utility model is characterized in that, described reset circuit adopts the discrete component framework.
Implement the reset circuit of SCM that the utility model provides, its saltus step threshold voltage U
tIrrelevant with the single-chip microcomputer working power, can be stabilized in U
z+ 0.7V is lower than threshold voltage U when supply voltage drops to
tThe time, the Single Chip Microcomputer (SCM) system reliable reset.Simultaneously because discharge diode D
1Effect, make the power supply burr of certain width also can make system's reliable reset; And delay capacitor C
2Charge function reset level can be kept the regular hour, thereby prevent that effectively power switch or attaching plug branch-close the shake that causes in the process and influence from resetting.Utilize discrete component and Analogical Circuit Technique to substitute integrated chip, then make circuit simple and cost is low, be easy to promote the use of.
Description of drawings
Fig. 1 is the reset circuit of SCM that the utility model provides.
Embodiment
In conjunction with the accompanying drawings and embodiments, further specify the utility model such as Fig. 1, reset circuit of SCM of the present utility model is by triode Q
1, resistance R
1, R
2, capacitor C
1, C
2, switching diode D
1With voltage stabilizing diode Z
1Form, operating voltage is the shared V of system
CCD.C. regulated power supply.When system works powers on, V
CCDirect supply is by stabilivolt Z
1And resistance R
1Give delay capacitor C
2Charging, transistor Q at this moment
1End, reset circuit is exported a high level to master chip reset terminal RST, and system reset is as delay capacitor C
2Voltage reach 0.7V the time, transistor Q
1Conducting, reset circuit are exported a low level to master chip reset terminal RST, and system begins operate as normal; As system voltage V
CCSlowly drop to and be lower than U
zDuring+0.7V, triode Q
1End system reset.This shows, correct start-up system when this reset circuit can guarantee that system powers on, power-fail or power supply are lower than U
zDuring+0.7V, resetting system.Change delay capacitor C
2Capacity can adjust time of the time-delay that resets, and because the discharge process of discharge diode can bleed off C very soon when the power supply burr
2In electric weight, system is normally resetted.Change described delay capacitor C
2Electric capacity can change above-mentioned delay time.
Claims (6)
1, a kind of reset circuit of SCM is characterized in that, comprises monitoring means that is used for the monitoring change in voltage and the output unit that is used to export reset level and delay capacitor C
2With discharge diode D
1, described monitoring means comprises the voltage stabilizing diode Z that makes reset circuit that stable saltus step threshold voltage be arranged
1With current-limiting resistance R
1, described output unit comprises transistor Q
1With current-limiting resistance R
2And the filter capacitor C that avoids high-frequency harmonic that circuit is disturbed
1
2, reset circuit of SCM according to claim 1 is characterized in that, described reset circuit saltus step threshold voltage U
tBe U
z+ 0.7V, wherein, U
zBe described voltage stabilizing diode Z
1Stable voltage, be lower than threshold voltage U when supply voltage drops to
tThe time, described transistor Q
1End the high level signal that described reset circuit output terminal output resets single-chip microcomputer.
3, reset circuit of SCM according to claim 1 is characterized in that, described reset circuit saltus step threshold voltage U
tBe stabilized in U
z+ 0.7V selects different stabilivolts can change this threshold voltage.
4, according to any one described reset circuit of SCM among the claim 1-3, it is characterized in that, adopt the discrete component framework.
5, reset circuit of SCM according to claim 1 is characterized in that, described discharge diode D
1Be switching diode.
6, according to the described reset circuit of SCM of claim 1, it is characterized in that, regulate delay capacitor C
2Capacity can be adjusted delay time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420071351 CN2708377Y (en) | 2004-07-06 | 2004-07-06 | Single-chip microcomputer reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420071351 CN2708377Y (en) | 2004-07-06 | 2004-07-06 | Single-chip microcomputer reset circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2708377Y true CN2708377Y (en) | 2005-07-06 |
Family
ID=34852596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420071351 Expired - Fee Related CN2708377Y (en) | 2004-07-06 | 2004-07-06 | Single-chip microcomputer reset circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2708377Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470501B (en) * | 2007-12-26 | 2010-12-15 | 珠海中慧微电子有限公司 | Time-delay reset control circuit and method |
| CN102081558A (en) * | 2011-01-24 | 2011-06-01 | 北京北大千方科技有限公司 | Watchdog circuit in on-board unit and on-board unit |
| CN102568585A (en) * | 2010-12-17 | 2012-07-11 | 西安奇维测控科技有限公司 | Hardware circuit reliably carrying out data destruction |
| CN102882496A (en) * | 2012-09-25 | 2013-01-16 | 宁德时代新能源科技有限公司 | Circuit with switch detection and microcontroller reset functions |
| CN103134976A (en) * | 2013-02-21 | 2013-06-05 | 天津华宁电子有限公司 | Mine circuit electrification indication device and achieving method based on magnetic circuit blocking technology |
| CN103647535A (en) * | 2013-12-10 | 2014-03-19 | 青岛歌尔声学科技有限公司 | RC reset circuit with power supply inspection and control function |
| CN103746681A (en) * | 2013-12-24 | 2014-04-23 | 北京时代民芯科技有限公司 | Power-on/power-down output tri-state control circuit for CMOS device power supply |
| CN103888113A (en) * | 2014-03-24 | 2014-06-25 | 福建师范大学 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
| CN104965579A (en) * | 2015-07-24 | 2015-10-07 | 康泰医学系统（秦皇岛）股份有限公司 | Long press key reset circuit of device microprocessor and complex function method thereof |
-
2004
- 2004-07-06 CN CN 200420071351 patent/CN2708377Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470501B (en) * | 2007-12-26 | 2010-12-15 | 珠海中慧微电子有限公司 | Time-delay reset control circuit and method |
| CN102568585B (en) * | 2010-12-17 | 2015-02-25 | 西安奇维科技股份有限公司 | Hardware circuit reliably carrying out data destruction |
| CN102568585A (en) * | 2010-12-17 | 2012-07-11 | 西安奇维测控科技有限公司 | Hardware circuit reliably carrying out data destruction |
| CN102081558A (en) * | 2011-01-24 | 2011-06-01 | 北京北大千方科技有限公司 | Watchdog circuit in on-board unit and on-board unit |
| CN102081558B (en) * | 2011-01-24 | 2013-05-22 | 北京北大千方科技有限公司 | Watchdog circuit in on-board unit and on-board unit |
| CN102882496A (en) * | 2012-09-25 | 2013-01-16 | 宁德时代新能源科技有限公司 | Circuit with switch detection and microcontroller reset functions |
| CN102882496B (en) * | 2012-09-25 | 2018-04-10 | 宁德时代新能源科技股份有限公司 | Circuit with switch detection and microcontroller reset functions |
| CN103134976A (en) * | 2013-02-21 | 2013-06-05 | 天津华宁电子有限公司 | Mine circuit electrification indication device and achieving method based on magnetic circuit blocking technology |
| CN103647535A (en) * | 2013-12-10 | 2014-03-19 | 青岛歌尔声学科技有限公司 | RC reset circuit with power supply inspection and control function |
| CN103746681A (en) * | 2013-12-24 | 2014-04-23 | 北京时代民芯科技有限公司 | Power-on/power-down output tri-state control circuit for CMOS device power supply |
| CN103746681B (en) * | 2013-12-24 | 2017-06-30 | 北京时代民芯科技有限公司 | A kind of upper and lower electricity output tri-state control circuit of cmos device power supply |
| CN103888113A (en) * | 2014-03-24 | 2014-06-25 | 福建师范大学 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
| CN104965579A (en) * | 2015-07-24 | 2015-10-07 | 康泰医学系统（秦皇岛）股份有限公司 | Long press key reset circuit of device microprocessor and complex function method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |