CN203084643U - Double-power-supply power-on reset circuit for single chip microcomputer - Google Patents
Double-power-supply power-on reset circuit for single chip microcomputer Download PDFInfo
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- CN203084643U CN203084643U CN 201220729427 CN201220729427U CN203084643U CN 203084643 U CN203084643 U CN 203084643U CN 201220729427 CN201220729427 CN 201220729427 CN 201220729427 U CN201220729427 U CN 201220729427U CN 203084643 U CN203084643 U CN 203084643U
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Abstract
The utility model relates to a double-power-supply power-on reset circuit for a single chip microcomputer. The double-power-supply power-on reset circuit for the single chip microcomputer comprises a single chip microcomputer chip. The double-power-supply power-on reset circuit for the single chip microcomputer is characterized in that a main power source circuit (1) and an auxiliary power source circuit (2) are arranged on a reset input end of the single chip microcomputer chip, the input end of the main power source circuit (1) is connected with a power source VDD, the input end of the auxiliary power source circuit (2) is connected with a power source VCC, the output end of the main power source circuit (1) and the output end of the auxiliary power source circuit (2) are connected with a reset terminal RESET of the single chip microcomputer chip, the output end of the main power source circuit (1) and the output end of the auxiliary power source circuit (2) are connected with the ground through capacitors, reset pulses are produced on the reset terminal RESET of the single chip microcomputer chip by using the characteristic that voltage at two ends of the capacitor is incapable of suddenly changing, and a double-power-supply power-on reset circuit structure is formed. Due to the fact that a main power source and an auxiliary power source are used for carrying out power supply, the formed double-power-supply power-on reset circuit structure can ensure reliable reset of the single chip microcomputer when any power source is power-on, or when the auxiliary power source carries out normal power supply, the main power source is power-on, reliable reset of the single chip microcomputer can also be ensured, and the double-power-supply power-on reset circuit for the single chip microcomputer has the advantages of protecting safety of electric appliances and users.
Description
Technical field:
The utility model is a kind of duplicate supply reset circuit, particularly a kind of duplicate supply electrify restoration circuit that is used for single-chip microcomputer.Belong to the electrical apparatus control circuit technical field.
Background technology:
At present, in the small household appliances field, along with people are more and more higher to the electrical automation requirement, a lot of products all utilize the digit chip control circuit to carry out intellectuality control, to improve user's experience and convenience.But in the chip controls circuit, whether reset potential leans on property, be related to the security of intelligence control circuit, if run into outage midway, when restoring electricity, require reset circuit in time to reset safely and reliably, in order to avoid electrical equipment non-normal working unexpectedly causes electrical equipment to damage even jeopardize user's personal safety easily.
Therefore,, need set the reset circuit of single-chip microcomputer, the work that resets reliably when accomplishing to power on, protection electrical equipment and user's safety in order to guarantee the safe in utilization of electrical equipment.How setting the reset circuit of monolithic, is the utility model technical issues that need to address.
The utility model content:
The purpose of this utility model is in order to solve the problem of single-chip microcomputer electrification reset, a kind of duplicate supply electrify restoration circuit that is used for single-chip microcomputer to be provided.Have the reliability of resetting height, characteristics such as circuit component is few and circuit structure is simple.
The purpose of this utility model can reach by taking following technical scheme:
Be used for the duplicate supply electrify restoration circuit of single-chip microcomputer, comprise singlechip chip, its design feature is: the RESET input at singlechip chip is provided with main power circuit and auxiliary power circuit; The input end of main power circuit connects power vd D, and the input end of auxiliary power circuit connects power supply VCC, and the output terminal of the output terminal of main power circuit, auxiliary power circuit connects the reset terminal RESET of monolithic chip; The output terminal of main power circuit and auxiliary power circuit is by capacity earth, and the characteristic of utilizing the electric capacity both end voltage not suddenly change produces reset pulse at the reseting port RESET of single-chip microcomputer, forms duplicate supply electrification reset loop structure.
The purpose of this utility model can also reach by taking following technical scheme:
A kind of Technological improvement plan of the present utility model is: main power circuit can be made up of triode Q1, capacitor C 1, resistance R 1 and R3, diode D1, and the auxiliary power circuit can be made up of resistance R 2, diode D2 and capacitor C 2; The base stage of triode Q1 connects power vd D by resistance R 1, capacitor C 1, and resistance R 1 is connected with the positive pole of diode D1 with the tie point of capacitor C 1, and the base stage of triode Q1 is by resistance R 3 ground connection; The collector of triode Q1 connects the reset terminal RESET of monolithic chip; Resistance R 2 is in parallel with diode D2, also an end of joint group connects power supply VCC, the other end connects the collector of triode Q1 and the reset terminal RESET of monolithic chip, capacitor C 2 is connected across between the reset terminal RESET and ground of monolithic chip, the grounded emitter of triode Q1; Form duplicate supply electrification reset loop structure.
A kind of Technological improvement plan of the present utility model is: described triode Q1 can be NPN type switch triode.
The beneficial effects of the utility model are:
1, the utility model is owing to adopt major and minor two-way power supply power supply, and the duplicate supply electrification reset loop structure of formation can both guarantee the single-chip microcomputer reliable reset when arbitrary power supply electrifying; Or when the auxiliary power normal power supply, primary power powers on and also guarantees the single-chip microcomputer reliable reset, therefore has the beneficial effect of protection electrical equipment and user's safety.
2, it is simple to the utlity model has circuit structure, the few and high beneficial effect of reliability of circuit component.
Description of drawings
Fig. 1 is the schematic diagram of the utility model reset circuit.
Embodiment:
Below in conjunction with drawings and Examples the utility model is described in further detail:
Specific embodiment 1:
With reference to Fig. 1, present embodiment comprises singlechip chip, at the RESET input of singlechip chip main power circuit 1 and auxiliary power circuit 2 is set; The input end of main power circuit 1 connects power vd D, and the input end of auxiliary power circuit 2 connects power supply VCC, and the output terminal of the output terminal of main power circuit 1, auxiliary power circuit 2 connects the reset terminal RESET of monolithic chip; The output terminal of main power circuit 1 and auxiliary power circuit 2 is by capacity earth, and the characteristic of utilizing the electric capacity both end voltage not suddenly change produces reset pulse at the reseting port RESET of single-chip microcomputer, forms duplicate supply electrification reset loop structure.
In the present embodiment:
Described triode Q1 is a NPN type switch triode.
The principle of work of present embodiment:
With reference to Fig. 1, the utility model adopts two power vd D and VCC to power separately, and circuit reliability is higher, is in particular in:
(1) primary power VDD does not power, when auxiliary power VCC powers on:
When VCC on the auxiliary power is electric, when rising to burning voltage by 0V, VCC charges by 2 pairs of capacitor C of resistance R 2.Because capacitor C 2 both end voltage can not be suddenlyd change, charging needs the regular hour (this time is depended on the time constant of resistance R 2 and capacitor C 2), forms the low level pulse of a period of time at the RESET port; Charging process finishes to make the RESET port to keep high level when the voltage of capacitor C 2 is charged to VCC voltage, thereby has finished the reset operation of single-chip microcomputer when auxiliary power powers on.And the effect of D2 is fast the voltage on the capacitor C 2 to be bled off when the auxiliary power power down, to guarantee electrification reset process next time.
(2) auxiliary power VCC does not power, when primary power VDD powers on:
When primary power powered on, the Base-Emitter by resistance R 1 and triode Q1 when VDD rises to burning voltage by 0V charged to capacitor C 1.Because capacitor C 1 both end voltage can not be suddenlyd change, charging needs the regular hour (this time is depended on the time constant of resistance R 1 and capacitor C 1), owing to there is the base stage that electric current flows through triode Q1 to cause triode Q1 conducting, form the low level pulse of a period of time at the RESET port during charging; Charging process end triode Q1 ends when the voltage of capacitor C 1 is charged to vdd voltage, and makes the RESET port keep high level, thereby has finished the reset operation of single-chip microcomputer when primary power powers on.
(3) auxiliary power power supply, when primary power powers on:
When primary power powered on, the Base-Emitter by resistance R 1 and triode Q1 when VDD rises to burning voltage by 0V charged to capacitor C 1.Because capacitor C 1 both end voltage can not be suddenlyd change, charging needs the regular hour (this time is depended on the time constant of resistance R 1 and capacitor C 1), owing to there is the base stage that electric current flows through triode Q1 to cause triode Q1 conducting, form the low level pulse of a period of time at the RESET port during charging; Charging process end triode Q1 ends when the voltage of capacitor C 1 is charged to vdd voltage, and makes the RESET port keep high level, thereby has finished the reset operation of single-chip microcomputer when primary power powers on.
The electrification reset current potential that the utility model adopts two groups of power supplys to power respectively, the characteristic of utilizing capacitor C 1 and C2 both end voltage not to suddenly change, when the major-minor power supply electrifying, produce the low pulse signal of a period of time and make the single-chip microcomputer electrification reset, and finish back maintenance RESET port high level powering at the RESET port.Thereby realize reset operation reliably.
Claims (3)
1. be used for the duplicate supply electrify restoration circuit of single-chip microcomputer, comprise singlechip chip, it is characterized in that: the RESET input at singlechip chip is provided with main power circuit (1) and auxiliary power circuit (2); The input end of main power circuit (1) connects power vd D, and the input end of auxiliary power circuit (2) connects power supply VCC, and the output terminal of the output terminal of main power circuit (1), auxiliary power circuit (2) connects the reset terminal RESET of monolithic chip; The output terminal of main power circuit (1) and auxiliary power circuit (2) is by capacity earth, and the characteristic of utilizing the electric capacity both end voltage not suddenly change produces reset pulse at the reseting port RESET of single-chip microcomputer, forms duplicate supply electrification reset loop structure.
2. the duplicate supply electrify restoration circuit that is used for single-chip microcomputer according to claim 1, it is characterized in that: main power circuit (1) is made up of triode Q1, capacitor C 1, resistance R 1 and R3, diode D1, and auxiliary power circuit (2) is made up of resistance R 2, diode D2 and capacitor C 2; The base stage of triode Q connects power vd D by resistance R 1, capacitor C 1, and resistance R 1 is connected with the positive pole of diode D1 with the tie point of capacitor C 1, and the base stage of triode Q is by resistance R 3 ground connection; The collector of triode Q connects the reset terminal RESET of monolithic chip; Resistance R 2 is in parallel with diode D2, also an end of joint group connects power supply VCC, the other end connects the collector of triode Q and the reset terminal RESET of monolithic chip, capacitor C 2 is connected across between the reset terminal RESET and ground of monolithic chip, the grounded emitter of triode Q1; Form duplicate supply electrification reset loop structure.
3. the duplicate supply electrify restoration circuit that is used for single-chip microcomputer according to claim 1 and 2 is characterized in that: described triode Q1 is a NPN type switch triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220729427 CN203084643U (en) | 2012-12-26 | 2012-12-26 | Double-power-supply power-on reset circuit for single chip microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220729427 CN203084643U (en) | 2012-12-26 | 2012-12-26 | Double-power-supply power-on reset circuit for single chip microcomputer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203084643U true CN203084643U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220729427 Expired - Lifetime CN203084643U (en) | 2012-12-26 | 2012-12-26 | Double-power-supply power-on reset circuit for single chip microcomputer |
Country Status (1)
| Country | Link |
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| CN (1) | CN203084643U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676736A (en) * | 2013-11-30 | 2014-03-26 | 成都天奥信息科技有限公司 | Signal-stable circuit during single-chip microcomputer power up starting |
| CN104076890A (en) * | 2014-06-24 | 2014-10-01 | 苏州塔可盛电子科技有限公司 | Control circuit of signal source system based on STC12C5412 single-chip microcomputer |
| CN104423514A (en) * | 2013-08-19 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Single chip microcomputer reset circuit and microcomputer system |
| 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 |
| CN112486060A (en) * | 2020-11-20 | 2021-03-12 | 深圳市沃特沃德股份有限公司 | Reset circuit, circuit board and electronic product of singlechip |
-
2012
- 2012-12-26 CN CN 201220729427 patent/CN203084643U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104423514A (en) * | 2013-08-19 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Single chip microcomputer reset circuit and microcomputer system |
| CN104423514B (en) * | 2013-08-19 | 2018-10-26 | 海洋王（东莞）照明科技有限公司 | A kind of reset circuit of SCM and microsystem |
| CN103676736A (en) * | 2013-11-30 | 2014-03-26 | 成都天奥信息科技有限公司 | Signal-stable circuit during single-chip microcomputer power up starting |
| CN104076890A (en) * | 2014-06-24 | 2014-10-01 | 苏州塔可盛电子科技有限公司 | Control circuit of signal source system based on STC12C5412 single-chip microcomputer |
| 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 |
| CN112486060A (en) * | 2020-11-20 | 2021-03-12 | 深圳市沃特沃德股份有限公司 | Reset circuit, circuit board and electronic product of singlechip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., Free format text: FORMER NAME: FOSHAN SHUNDE REALDESIGN ELECTRONICS INDUSTRY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 528300 Shunde, Guangdong, Daliang Industrial Park, Fengxiang, Xiang Xiang Road, No. 1 Patentee after: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 528300 Guangdong province Foshan city Shunde District Daliang Industrial Park Fengxiang Huaye Road No. 1 Patentee before: FOSHAN SHUNDE REAL DESIGN ELECTRONICS IND CO.,LTD. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130724 |
|
| CX01 | Expiry of patent term |