CN104035537A - MAX7705ESA-chip based single-chip microcomputer reset circuit - Google Patents
MAX7705ESA-chip based single-chip microcomputer reset circuit Download PDFInfo
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- CN104035537A CN104035537A CN201410281392.3A CN201410281392A CN104035537A CN 104035537 A CN104035537 A CN 104035537A CN 201410281392 A CN201410281392 A CN 201410281392A CN 104035537 A CN104035537 A CN 104035537A
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Abstract
The invention discloses an MAX7705ESA-chip based single-chip microcomputer reset circuit. Rated signals are timely transmitted to a Watchdog timer circuit through an MAX7705ESA chip, the operation state of a single-chip microcomputer is thereby detected, and the situation that voltage of a single-chip microcomputer drops too low and cannot be reset in the prior art is avoided; meanwhile, noises on a power supply can be filtered through a capacitor C5, and stability of the entire reset circuit can be guaranteed.
Description
Technical field
The present invention relates to a kind of holding circuit, specifically a kind of reset circuit of SCM based on MAX7705ESA chip.
Background technology
On ordinary meaning, reset chip is to replace rc reset, conventionally be used in the higher occasion of reset wave requirement, just such as RC resets, its waveform is slower, and consistance is poor, if with special reset chip, the reset wave of output is just very good, loses and does not have a practicality but special chip cost is high.
Summary of the invention
The object of the present invention is to provide a kind of house dog timing circuit Watchdog that utilizes to the reset circuit that single-chip microcomputer detects and rapid feedback resets to single-chip microcomputer, to solve the problem proposing in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
A kind of reset circuit of SCM based on MAX7705ESA chip, comprise supply voltage timing testing circuit 1, time set circuit 2, trigger circuit 3 and supervisory circuit encapsulation, described supply voltage timing testing circuit 1 comprises power supply, described positive source is VCC, a capacitor C 5 of the outer series connection of power supply, described capacitor C 5 is connected with 3 with the pin one of house dog timing circuit Watchdog respectively, the pin two ground connection of described house dog timing circuit Watchdog, and its pin 8 is connected with pin 4, the pin 7 of described house dog timing circuit Watchdog is by the B utmost point of resistance R 2 connecting triode Q1, the E utmost point ground connection of described diode, 1 pin of C utmost point contact resistance R1 and supervisory circuit encapsulation, described supervisory circuit is encapsulated as active MAX7705ESA chip, the positive source of described voltage detection circuit is that VCC is connected with MAX7705ESA chip the 8th pin, described time set circuit 2 connects MAX7705ESA chip the 3rd, the 4th pin, described trigger circuit 3 connect MAX7705ESA chip the 6th pin, described MAX7705ESA chip the 7th pin preset output is connected with single-chip microcomputer, described MAX7705ESA chip the 5th pin ground connection.
As the further scheme of the present invention: described time set circuit 2 comprises capacitor C 1, C2 and C3, described capacitor C 1 one end connects the 3rd pin of supervisory circuit encapsulation, the other end is connected with capacitor C 2 one end, capacitor C 3 one end and ground wire, and described capacitor C 2 other ends are connected with the 4th pin of control circuit encapsulation with capacitor C 3 other ends.
Compared with prior art, the invention has the beneficial effects as follows: by the timing of MAX7705ESA chip, house dog timing circuit Watchdog is sent to rated signal, thereby detect the duty of single-chip microcomputer, avoided that the voltage of single-chip microcomputer under conventional art falls too low and the situation that cannot reset, capacitor C 5 can, by the noise filtering on power supply, ensure the stability of whole reset circuit simultaneously.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, in the embodiment of the present invention, a kind of reset circuit of SCM based on MAX7705ESA chip, comprise supply voltage timing testing circuit 1, time set circuit 2, trigger circuit 3 and supervisory circuit encapsulation, described supply voltage timing testing circuit 1 comprises power supply, described positive source is VCC, a capacitor C 5 of the outer series connection of power supply, described capacitor C 5 is connected with 3 with the pin one of house dog timing circuit Watchdog respectively, the pin two ground connection of described house dog timing circuit Watchdog, and its pin 8 is connected with pin 4, the pin 7 of described house dog timing circuit Watchdog is by the B utmost point of resistance R 2 connecting triode Q1, the E utmost point ground connection of described diode, 1 pin of C utmost point contact resistance R1 and supervisory circuit encapsulation, described supervisory circuit is encapsulated as active MAX7705ESA chip, the positive source of described voltage detection circuit is that VCC is connected with MAX7705ESA chip the 8th pin, described time set circuit 2 connects MAX7705ESA chip the 3rd, the 4th pin, described trigger circuit 3 connect MAX7705ESA chip the 6th pin, described MAX7705ESA chip the 7th pin preset output is connected with single-chip microcomputer, described MAX7705ESA chip the 5th pin ground connection.
Further, described time set circuit 2 comprises capacitor C 1, C2 and C3, described capacitor C 1 one end connects the 3rd pin of supervisory circuit encapsulation, and the other end is connected with capacitor C 2 one end, capacitor C 3 one end and ground wire, and described capacitor C 2 other ends are connected with the 4th pin of control circuit encapsulation with capacitor C 3 other ends.
Principle of work of the present invention is: the present invention utilizes time set circuit 2 timing controlled MAX7705ESA chips to send the signal of rated voltage to house dog timing circuit Watchdog, when the voltage of single-chip microcomputer is in the time that ratings is above, make house dog timing circuit Watchdog timing receive signal by triode Q1, now house dog timing circuit Watchdog does not work, in the time that the voltage of sheet machine drops to below ratings, described house dog timing circuit Watchdog cannot receive that signal will reset to single-chip microcomputer by FEEDBACK CONTROL MAX7705ESA chip within the time of specifying.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned example embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, is therefore intended to all changes that drop in the implication and the scope that are equal to important document of claim to include in the present invention.Any Reference numeral in claim should be considered as limiting related claim.
In addition, be to be understood that, although this instructions is described according to embodiment, but be not that each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should make instructions as a whole, and the technical scheme in each embodiment also can, through appropriately combined, form other embodiments that it will be appreciated by those skilled in the art that.
Claims (2)
1. the reset circuit of SCM based on MAX7705ESA chip, comprise supply voltage timing testing circuit, time set circuit, trigger circuit and supervisory circuit encapsulation, it is characterized in that, described supply voltage timing testing circuit comprises power supply, described positive source is VCC, a capacitor C 5 of the outer series connection of power supply, described capacitor C 5 is connected with pin 3 with the pin one of house dog timing circuit Watchdog respectively, the pin two ground connection of described house dog timing circuit Watchdog, and its pin 8 is connected with pin 4, the pin 7 of described house dog timing circuit Watchdog is by the B utmost point of resistance R 2 connecting triode Q1, the E utmost point ground connection of described diode, 1 pin of C utmost point contact resistance R1 and supervisory circuit encapsulation, described supervisory circuit is encapsulated as active MAX7705ESA chip, the positive source of described voltage detection circuit is that VCC is connected with MAX7705ESA chip the 8th pin, described time set circuit 2 connects MAX7705ESA chip the 3rd pin, the 4th pin, described trigger circuit connect MAX7705ESA chip the 6th pin, described MAX7705ESA chip the 7th pin preset output is connected with single-chip microcomputer, described MAX7705ESA chip the 5th pin ground connection.
2. a kind of reset circuit of SCM based on MAX7705ESA chip according to claim 1, it is characterized in that, described time set circuit 2 comprises capacitor C 1, C2 and C3, described capacitor C 1 one end connects the 3rd pin of supervisory circuit encapsulation, the other end is connected with capacitor C 2 one end, capacitor C 3 one end and ground wire, and described capacitor C 2 other ends are connected with the 4th pin of control circuit encapsulation with capacitor C 3 other ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410281392.3A CN104035537A (en) | 2014-06-23 | 2014-06-23 | MAX7705ESA-chip based single-chip microcomputer reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410281392.3A CN104035537A (en) | 2014-06-23 | 2014-06-23 | MAX7705ESA-chip based single-chip microcomputer reset circuit |
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| CN104035537A true CN104035537A (en) | 2014-09-10 |
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| CN201410281392.3A Pending CN104035537A (en) | 2014-06-23 | 2014-06-23 | MAX7705ESA-chip based single-chip microcomputer reset circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030079163A1 (en) * | 2001-10-24 | 2003-04-24 | Mitsubishi Denki Kabushiki Kaisha | Microprocessor runaway monitoring control circuit |
| CN101281414A (en) * | 2007-04-07 | 2008-10-08 | 深圳迈瑞生物医疗电子股份有限公司 | Controllable watchdog replacement system |
| CN202383514U (en) * | 2011-11-09 | 2012-08-15 | 李伟 | CAN communication mode based excitation fault diagnosis apparatus |
| CN102866931A (en) * | 2012-09-06 | 2013-01-09 | 广西电网公司电力科学研究院 | Watchdog circuit for monitoring device for fault traveling wave of high-voltage transmission line |
| CN202995612U (en) * | 2012-12-13 | 2013-06-12 | 泉州豪杰信息科技发展有限公司 | Singlechip reset circuit |
| CN203930676U (en) * | 2014-06-23 | 2014-11-05 | 苏州塔可盛电子科技有限公司 | A kind of reset circuit of SCM based on MAX7705ESA chip |
-
2014
- 2014-06-23 CN CN201410281392.3A patent/CN104035537A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030079163A1 (en) * | 2001-10-24 | 2003-04-24 | Mitsubishi Denki Kabushiki Kaisha | Microprocessor runaway monitoring control circuit |
| CN101281414A (en) * | 2007-04-07 | 2008-10-08 | 深圳迈瑞生物医疗电子股份有限公司 | Controllable watchdog replacement system |
| CN202383514U (en) * | 2011-11-09 | 2012-08-15 | 李伟 | CAN communication mode based excitation fault diagnosis apparatus |
| CN102866931A (en) * | 2012-09-06 | 2013-01-09 | 广西电网公司电力科学研究院 | Watchdog circuit for monitoring device for fault traveling wave of high-voltage transmission line |
| CN202995612U (en) * | 2012-12-13 | 2013-06-12 | 泉州豪杰信息科技发展有限公司 | Singlechip reset circuit |
| CN203930676U (en) * | 2014-06-23 | 2014-11-05 | 苏州塔可盛电子科技有限公司 | A kind of reset circuit of SCM based on MAX7705ESA chip |
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Application publication date: 20140910 |