CN103731976A - PCB compatible with at least two watchdog circuits - Google Patents
PCB compatible with at least two watchdog circuits Download PDFInfo
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- CN103731976A CN103731976A CN201310683836.1A CN201310683836A CN103731976A CN 103731976 A CN103731976 A CN 103731976A CN 201310683836 A CN201310683836 A CN 201310683836A CN 103731976 A CN103731976 A CN 103731976A
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- watchdog
- circuit
- pin
- watchdog circuit
- pcb board
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Abstract
The invention relates to a PCB compatible with at least two watchdog circuits and belongs to the technical field of single chip microcomputer control. First resistance welding positions connected with second pins of the watchdog circuits, second resistance welding positions and third resistance welding positions are arranged on the PCB, and different resistors are welded to different watchdogs, wherein the second resistance welding positions are connected with third pins of the watchdog circuits and the third resistance welding positions are connected with seventh pins of the watchdog circuits. Thus, the PCB is compatible with different watchdogs, affection on production and delivery by insufficient chips is reduced, so that when a watchdog circuit of a single chip microcomputer is replaced, only the corresponding resistor is welded, the PCB does not need to be redesigned, cost is reduced and meanwhile, the efficiency is improved.
Description
Technical field
The present invention relates to the pcb board of at least two kinds of watchdog circuits of a kind of compatibility, belong to single-chip microcomputer control technology field.
Background technology
WatchDog Timer is an important component part of single chip circuit, debugging and in service the having great significance of Single Chip Microcomputer (SCM) program.Its major function is when there is software fault, by house dog device (if software is not by device zero clearing), by monolithic processor resetting, in electronic circuit, is widely used.When product is produced in batches, during due to supply channel or price reasons replacing device, need to redesign PCB and revise bottom software, increase cost and workload.
Summary of the invention
The object of this invention is to provide the pcb board of at least two kinds of watchdog circuits of a kind of compatibility, to solve current single-chip microcomputer, need to redesign pcb board during watchdog circuit and brought use inconvenience and the high problem of cost changing.
The present invention is for solving the problems of the technologies described above the pcb board that at least two kinds of watchdog circuits of a kind of compatibility are provided, on this pcb board, be laid with the first resistance welded position for being connected with watchdog circuit the 2nd pin, the the second resistance welded position being connected with watchdog circuit the 3rd pin and the 3rd resistance welded position being connected with watchdog circuit the 7th pin, the 2nd pin welding of pad of described the first resistance welded position and watchdog circuit, another pad is connected with the peripheral pull-up circuit of monolithic processor resetting end, the 3rd pin welding of pad of the second resistance welded position and watchdog circuit, another pad is connected with the peripheral pull-up circuit of monolithic processor resetting end, the 7th pin welding of pad of the 3rd resistance welded position and watchdog circuit, another pad ground connection.
Described watchdog circuit is with IIC interface or the watchdog circuit with SPI interface.
Described watchdog circuit is X4043 or CAT1021.
The invention has the beneficial effects as follows: the present invention by laying the first resistance welded position for being connected with watchdog circuit the 2nd pin on pcb board, the the second resistance welded position being connected with watchdog circuit the 3rd pin and the 3rd resistance welded position being connected with watchdog circuit the 7th pin, different house dogs is welded different resistance, realize the compatibility of different house dogs, reduce chip and lacked material to the impact of producing and paying, make single-chip microcomputer when changing watchdog circuit, only need weld corresponding resistance, do not need to redesign pcb board, reduced cost, also improved efficiency simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the pcb board of at least two kinds of watchdog circuits of compatibility of the present invention;
Fig. 2 is the laying schematic diagram of pcb board when house dog is selected X4043 in the embodiment of the present invention;
Fig. 3 is the laying schematic diagram of pcb board when house dog is selected CAT1021 in the embodiment of the present invention;
Fig. 4 is the identification process figure of watchdog circuit in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present invention is further described.
The pcb board of at least two kinds of watchdog circuits of a kind of compatibility of the present invention, on this pcb board, be laid with configuration circuit, as shown in Figure 1, the configuration circuit of laying on this pcb board includes the first resistance R 1 welding position for being connected with watchdog circuit U1 the 2nd pin, the welding position of the second resistance R 2 welding positions that are connected with watchdog circuit the 3rd pin and the 3rd resistance R 4 being connected with watchdog circuit the 7th pin, the 2nd pin welding of pad of the first resistance R 1 welding position and watchdog circuit U1, another pad is connected with the peripheral pull-up circuit of single-chip microcomputer U2 reset terminal, the 3rd pin welding of pad of the second resistance R 2 welding positions and watchdog circuit, another pad is connected with the peripheral pull-up circuit of monolithic processor resetting end, the 7th pin welding of pad of the 3rd resistance R 4 welding positions and watchdog circuit U1, another pad ground connection.
The house dog that in the present embodiment, we choose is X4043 and CAT1021, as shown in Figure 2, Vcc and Gnd are Power of SCM System and ground, SCL and SDA are clock letter and the bi-directional data signals of IIC, 2 pin of house dog U1 and 3 pin connect respectively the reseting pin of single-chip microcomputer through resistance R 1, R2, R3 and C1 composition RC reset circuit also connect the reseting pin of single-chip microcomputer, and 7 pin of house dog are through R4 ground connection.When watchdog circuit U1 selects X4043, as shown in Figure 2, the first resistance R 1 is not welded, and X4043 peripheral circuit normal configuration provides reset signal and outside EEPROM to single-chip microcomputer; When watchdog circuit is selected CAT1021, as shown in Figure 3, R2 and R4 do not weld, and CAT1021 can normally work, and meets system works needs.Wherein X4043 needs configuration just can make inner house dog come into force before using, CAT1021 is without this requirement, therefore bottom software also needs to carry out compatible design, in use can automatically identify watchdog chip, reduces and changes chip to the impact of producing, debugging link causes.The identification process of watchdog chip as shown in Figure 4, first initialization iic bus, acquiescence welding chip is X4043, then read control register, " T " represents to be read as merit, and " F " represents reading failure, double reading failure, the chip of confirming welding is CAT1021, if that welding is X4043, needs the house dog after write control register could normal work.
The present invention has realized the compatibility of house dog, by configuration circuit, realize the compatibility of hardware components, can automatic decision house dog type by reading control register, realized softwarecompatible design, by compatible design, hardware aspect has reduced chip and has lacked material to the impact of producing and paying; Utilize software to realize identification automatically, do not need artificial judgment, reduced cost of labor, improved operating efficiency.
Claims (3)
1. the pcb board of at least two kinds of watchdog circuits of a compatibility, it is characterized in that, on this pcb board, be laid with the first resistance welded position for being connected with watchdog circuit the 2nd pin, the the second resistance welded position being connected with watchdog circuit the 3rd pin and the 3rd resistance welded position being connected with watchdog circuit the 7th pin, the 2nd pin welding of pad of described the first resistance welded position and watchdog circuit, another pad is connected with the peripheral pull-up circuit of monolithic processor resetting end, the 3rd pin welding of pad of the second resistance welded position and watchdog circuit, another pad is connected with the peripheral pull-up circuit of monolithic processor resetting end, the 7th pin welding of pad of the 3rd resistance welded position and watchdog circuit, another pad ground connection.
2. the pcb board of at least two kinds of watchdog circuits of compatibility according to claim 1, is characterized in that, described watchdog circuit is with IIC interface or the watchdog circuit with SPI interface.
3. the pcb board of at least two kinds of watchdog circuits of compatibility according to claim 2, is characterized in that, described watchdog circuit is X4043 or CAT1021.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310683836.1A CN103731976A (en) | 2013-12-13 | 2013-12-13 | PCB compatible with at least two watchdog circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310683836.1A CN103731976A (en) | 2013-12-13 | 2013-12-13 | PCB compatible with at least two watchdog circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103731976A true CN103731976A (en) | 2014-04-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310683836.1A Pending CN103731976A (en) | 2013-12-13 | 2013-12-13 | PCB compatible with at least two watchdog circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103731976A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200973020Y (en) * | 2006-09-13 | 2007-11-07 | 上海协同科技股份有限公司 | Reactive compensation device with local radio digital transmission station |
| CN201018713Y (en) * | 2007-03-28 | 2008-02-06 | 青岛海信电器股份有限公司 | Circuit composing structure for compatibility of multiple same types function chip |
| CN101287333A (en) * | 2007-04-13 | 2008-10-15 | 鸿富锦精密工业（深圳）有限公司 | Common circuit for chips and wiring method for the common circuit |
| CN201359690Y (en) * | 2008-12-31 | 2009-12-09 | 浙江通普特种车有限公司 | General-purpose multiplex relay control system |
| CN203748099U (en) * | 2013-12-13 | 2014-07-30 | 郑州宇通客车股份有限公司 | PCB compatible with at least two watchdog circuits |
-
2013
- 2013-12-13 CN CN201310683836.1A patent/CN103731976A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200973020Y (en) * | 2006-09-13 | 2007-11-07 | 上海协同科技股份有限公司 | Reactive compensation device with local radio digital transmission station |
| CN201018713Y (en) * | 2007-03-28 | 2008-02-06 | 青岛海信电器股份有限公司 | Circuit composing structure for compatibility of multiple same types function chip |
| CN101287333A (en) * | 2007-04-13 | 2008-10-15 | 鸿富锦精密工业（深圳）有限公司 | Common circuit for chips and wiring method for the common circuit |
| CN201359690Y (en) * | 2008-12-31 | 2009-12-09 | 浙江通普特种车有限公司 | General-purpose multiplex relay control system |
| CN203748099U (en) * | 2013-12-13 | 2014-07-30 | 郑州宇通客车股份有限公司 | PCB compatible with at least two watchdog circuits |
Non-Patent Citations (1)
| Title |
|---|
| 张俊: "《匠人手记：一个单片机工作者的实践与思考》", 30 April 2008, 北京航空航天大学出版社 * |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140416 |
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| RJ01 | Rejection of invention patent application after publication |