CN202916618U - MCU mainboard circuit for meter reading terminal - Google Patents
MCU mainboard circuit for meter reading terminal Download PDFInfo
- Publication number
- CN202916618U CN202916618U CN2012206662469U CN201220666246U CN202916618U CN 202916618 U CN202916618 U CN 202916618U CN 2012206662469 U CN2012206662469 U CN 2012206662469U CN 201220666246 U CN201220666246 U CN 201220666246U CN 202916618 U CN202916618 U CN 202916618U
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- China
- Prior art keywords
- mcu
- circuit
- reset
- meter reading
- reading terminal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The utility model discloses a MCU mainboard circuit for a meter reading terminal, and the MCU mainboard circuit comprises a MCU, a reset circuit, a logic combinational circuit and an external expansion memory, the reset circuit is used for resetting the MCU when voltage abnormity is detected, simultaneously voltage monitoring to an external expansion memory circuit is carried out through the logic combinational circuit, and the logic combinational circuit is connected with an IO pin of the MCU and is used by the MCU for write-protection control of the external expansion memory. The MCU mainboard circuit is a minimum system for the meter reading terminal MCU mainboard, data rewriting of the memory in voltage abnormity is effectively prevented, and hardware protection is employed to prevent data loss. The MCU mainboard circuit for the meter reading terminal is simple and reliable in circuit design, stable in performance and simple in assembling, circuit fault problem caused by connector contact failure is reduced, and product stability is greatly improved.
Description
Technical field
The utility model relates to a kind of MCU motherboard circuit for meter reading terminal.
Background technology
At present, existing MCU motherboard circuit for meter reading terminal, comprise MCU, reset circuit, logic combination circuit and outer extension memory, wherein the reset chip in its reset circuit directly links to each other with the reset pin of MCU, when this reset chip output high level and the external world when being low level causes burning out of chip easily.In addition, its storer does not have holding circuit, causes easily losing of data, thereby causes very large economic loss.
The utility model content
The purpose of this utility model provides the high MCU motherboard circuit that is used for meter reading terminal of a kind of stability.
This MCU motherboard circuit for meter reading terminal that the utility model provides; comprise MCU, reset circuit, logic combination circuit and outer extension memory; reset circuit is used for resetting MCU when detecting electric voltage exception; implement voltage monitoring by logic combination circuit to extending out memory circuitry simultaneously; logic combination circuit links to each other with the IO pin of MCU, is used for MCU to the write-protect control of outer extension memory.
Described reset circuit comprises triode and reset chip, the emitter of triode links to each other with power supply by pull-up resistor, link to each other with the reset pin of MCU simultaneously, its base stage is connected to the reset terminal of reset chip by current-limiting resistance, its grounded collector, the power end of reset chip links to each other with power supply, its earth terminal ground connection, and filter capacitor is connected between the emitter and ground of triode.Described MCU adopts the chip of NXP company, and its model is LPC1765.It is the DATA FLASH of 8M that described outer extension memory adopts SPI mode and capacity.
The utility model is the minimum system for meter reading terminal MCU mainboard, effectively prevents the data rewriting of storer when electric voltage exception, adopts hardware protection to prevent loss of data.Circuit design of the present utility model is simple and reliable, stable performance; It is simple to adopt miniaturization to relate to the method assembling, has reduced the fault problem that the connector loose contact causes, has improved greatly the stability of product.
Description of drawings
Fig. 1 is the general frame of the present utility model.
Fig. 2 is reset circuit figure of the present utility model.
Fig. 3 is logic combination circuit of the present utility model.
Embodiment
As shown in Figure 1; the utility model comprises MCU, reset circuit, logic combination circuit and outer extension memory; reset circuit is used for resetting MCU when detecting electric voltage exception; implement voltage monitoring by logic combination circuit to extending out memory circuitry simultaneously; logic combination circuit links to each other with the IO pin of MCU, is used for MCU to the write-protect control of outer extension memory.
The utility model is the minimum system that the little mainboard of the MCU take the LPC1765 chip as core forms, and is applied to meter reading terminal.In actual applications, because system need to preserve the image data of 1000 table meters, so need extend out memory capacity.Therefore, the utility model adopts the outer extension memory mode, and adopting universal serial bus SPI interface and capacity is the DATA FLASH of 8M, can effectively reduce the pcb board space.
The utility model assembling is simple, has changed the assembling mode of conventional connector form, and has adopted postage stamp to be welded on the interface board.Like this, can reduce the fault that causes owing to the connector loose contact, thereby effectively improve product stability.
As shown in Figure 2, reset circuit of the present utility model comprises triode and reset chip, and this reset circuit adopts the TCM809 voltage checking chip.This chip has delayed and voltage detecting function, and the MCU that resets in the time of can detecting electric voltage exception in order to avoid MCU causes the program misoperation when electric voltage exception, can also assist and prevent storer data rewriting when electric voltage exception simultaneously.
The emitter of triode V8 links to each other with power supply 3P3V by pull-up resistor R40, links to each other with the reset pin of MCU simultaneously; Its base stage is connected to the reset terminal of reset chip D9 by current-limiting resistance R41, its grounded collector, and the power end of reset chip D9 links to each other with power supply 3P3V.This triode V8 plays the effect of buffering here, can effectively prevent from when the simulated device of reset pin drags down by force, can not damaging reset chip D9 under simulation status.
As shown in Figure 3, logic combination circuit is used for preventing loss of data.It has increased outer extension memory data cut-off protection function, adopts the writing protection function pin of the IO pin control outer extension memory of MCU, and service routine is controlled in real time.Simultaneously, realize that by the voltage monitoring of reset circuit the hardware mode protection prevents losing of data.
Claims (4)
1. MCU motherboard circuit that is used for meter reading terminal; comprise MCU; it is characterized in that; also comprise reset circuit, logic combination circuit and outer extension memory; reset circuit is used for resetting MCU when detecting electric voltage exception; implement voltage monitoring by logic combination circuit to extending out memory circuitry simultaneously, logic combination circuit links to each other with the IO pin of MCU, is used for MCU to the write-protect control of outer extension memory.
2. the MCU motherboard circuit for meter reading terminal according to claim 1, it is characterized in that, described reset circuit comprises triode and reset chip, the emitter of triode links to each other with power supply by pull-up resistor, links to each other with the reset pin of MCU simultaneously, and its base stage is connected to the reset terminal of reset chip by current-limiting resistance, its grounded collector, the power end of reset chip links to each other with power supply, its earth terminal ground connection, and filter capacitor is connected between the emitter and ground of triode.
3. the MCU motherboard circuit for meter reading terminal according to claim 1 is characterized in that, described MCU adopts the chip of NXP company, and its model is LPC1765.
4. the MCU motherboard circuit for meter reading terminal according to claim 1 is characterized in that, it is the DATA FLASH of 8M that described outer extension memory adopts SPI mode and capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206662469U CN202916618U (en) | 2012-12-06 | 2012-12-06 | MCU mainboard circuit for meter reading terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206662469U CN202916618U (en) | 2012-12-06 | 2012-12-06 | MCU mainboard circuit for meter reading terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202916618U true CN202916618U (en) | 2013-05-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012206662469U Expired - Lifetime CN202916618U (en) | 2012-12-06 | 2012-12-06 | MCU mainboard circuit for meter reading terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202916618U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016206263A1 (en) * | 2015-06-25 | 2016-12-29 | 上海斐讯数据通信技术有限公司 | System and method of preventing data corruption during power-on/power-off of spi flash |
| CN112650093A (en) * | 2020-09-25 | 2021-04-13 | 合肥恒烁半导体有限公司 | Digital reset circuit applied to MCU chip |
-
2012
- 2012-12-06 CN CN2012206662469U patent/CN202916618U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016206263A1 (en) * | 2015-06-25 | 2016-12-29 | 上海斐讯数据通信技术有限公司 | System and method of preventing data corruption during power-on/power-off of spi flash |
| CN112650093A (en) * | 2020-09-25 | 2021-04-13 | 合肥恒烁半导体有限公司 | Digital reset circuit applied to MCU chip |
| CN112650093B (en) * | 2020-09-25 | 2022-03-01 | 恒烁半导体(合肥)股份有限公司 | Digital reset circuit applied to MCU chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 410205 No. 468 west slope, Changsha hi tech Industrial Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee after: HUNAN WEISHENG INFORMATION TECHNOLOGY CO.,LTD. Address before: 410205 No. 468 west slope, Changsha hi tech Industrial Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee before: CHANGSHA WASION INFORMATION TECHNOLOGY Co.,Ltd. Address after: 410205 No. 468 west slope, Changsha hi tech Industrial Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee after: WILLFAR INFORMATION TECHNOLOGY Co.,Ltd. Address before: 410205 No. 468 west slope, Changsha hi tech Industrial Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee before: HUNAN WEISHENG INFORMATION TECHNOLOGY CO.,LTD. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130501 |