CN203930676U - A kind of reset circuit of SCM based on MAX7705ESA chip - Google Patents
A kind of reset circuit of SCM based on MAX7705ESA chip Download PDFInfo
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- CN203930676U CN203930676U CN201420337244.4U CN201420337244U CN203930676U CN 203930676 U CN203930676 U CN 203930676U CN 201420337244 U CN201420337244 U CN 201420337244U CN 203930676 U CN203930676 U CN 203930676U
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Abstract
The utility model discloses a kind of reset circuit of SCM based on MAX7705ESA chip, 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.
Description
Technical field
The utility model 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.
Utility model content
The purpose of this utility model 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 utility model 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 further program of the utility model: 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 beneficial effects of the utility model are: 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 utility model;
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, 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 utility model is: the utility model 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 utility model is not limited to the details of above-mentioned example embodiment, and in the situation that not deviating from spirit of the present utility model or essential characteristic, can realize the utility model with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present utility model 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 utility model.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 triode, 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 |
|---|---|---|---|
| CN201420337244.4U CN203930676U (en) | 2014-06-23 | 2014-06-23 | A kind of reset circuit of SCM based on MAX7705ESA chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420337244.4U CN203930676U (en) | 2014-06-23 | 2014-06-23 | A kind of reset circuit of SCM based on MAX7705ESA chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203930676U true CN203930676U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420337244.4U Expired - Fee Related CN203930676U (en) | 2014-06-23 | 2014-06-23 | A kind of reset circuit of SCM based on MAX7705ESA chip |
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| CN (1) | CN203930676U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104035537A (en) * | 2014-06-23 | 2014-09-10 | 苏州塔可盛电子科技有限公司 | MAX7705ESA-chip based single-chip microcomputer reset circuit |
-
2014
- 2014-06-23 CN CN201420337244.4U patent/CN203930676U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104035537A (en) * | 2014-06-23 | 2014-09-10 | 苏州塔可盛电子科技有限公司 | MAX7705ESA-chip based single-chip microcomputer reset circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20150623 |
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| EXPY | Termination of patent right or utility model |