CN204288773U - The Liquid Crystal Module interface circuit of integrated Hall device - Google Patents
The Liquid Crystal Module interface circuit of integrated Hall device Download PDFInfo
- Publication number
- CN204288773U CN204288773U CN201420850870.3U CN201420850870U CN204288773U CN 204288773 U CN204288773 U CN 204288773U CN 201420850870 U CN201420850870 U CN 201420850870U CN 204288773 U CN204288773 U CN 204288773U
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- chip
- liquid crystal
- hall device
- crystal module
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Abstract
The utility model is a kind of Liquid Crystal Module interface circuit of integrated Hall device, for the treatment of the voltage between hall device metering circuit and Liquid Crystal Module and data transmission, it comprises hall device metering circuit, the translation interface docked with Liquid Crystal Module, primary processor and integrated circuit (IC) chip, described integrated circuit (IC) chip comprises the first chip and the second chip, first chip and primary processor, translation interface is connected with the second chip, the data parallel-serial conversion of the first chip controls and Liquid Crystal Module, and control signal data are transferred out to the control end of the second chip, second chip is used for the detection data of hall device metering circuit and control signal to export to Liquid Crystal Module.The utility model solves the parallel-serial conversion simultaneously processing LCD MODULE and requires and can process the requirement of hall device status signal reading; IO takies few, takes up room little; For pure hardware circuit, do not need MCU, with low cost, stable performance.
Description
Technical field
The utility model belongs to technical field of liquid crystal display equipment, specifically relates to the voltage conversion circuit that a kind of liquid crystal display interface 5V turns 3V.
Background technology
Liquid crystal display is widely used in industrial process control field, as metallurgy, papermaking, petrochemical complex, pharmacy, food, brewage, cigarette, the industry such as mining industry, as measured the device of fluid flow, adopting hall device to detect, showing data on a liquid crystal display.The major part of Liquid Crystal Module liquid crystal display, the master control IC-SPLC780D of standard 16X2 character mode lcd module only has 8 6800 parallel port communication modes, if need the metering circuit of multiple hall device and Liquid Crystal Module to be made on the wiring board of, require that the communication port of hall device metering circuit and Liquid Crystal Module is realized by a unified serial communication interface, reduce I/O port line as far as possible, industrial control field is very high to the stability requirement of product, and cost pressure is large, if adopt the control circuit of special band MCU, IC and the kit price of MCU are very expensive, and software stability is difficult to ensure, a kind of parallel-serial conversion that simultaneously can process LCD MODULE is needed to require and the circuit of hall device status signal reading can be processed.
Utility model content
For the problems of the prior art, the purpose of this utility model is to provide a kind of Liquid Crystal Module interface circuit of integrated Hall device, can process the voltage request of the parallel-serial conversion of LCD MODULE, can also receive hall device status signal.
The utility model is realized by following technical scheme.
Design a kind of Liquid Crystal Module interface circuit of integrated Hall device, for the treatment of the voltage between hall device metering circuit and Liquid Crystal Module and data transmission, comprise hall device metering circuit, the translation interface docked with Liquid Crystal Module, primary processor and integrated circuit (IC) chip, described integrated circuit (IC) chip comprises the first chip and the second chip, first chip and primary processor, translation interface is connected with the second chip, the data parallel-serial conversion of the first chip controls and Liquid Crystal Module, and control signal data are transferred out to the control end of the second chip, second chip is used for the detection data of hall device metering circuit and control signal to export to Liquid Crystal Module.
In above-described technical scheme, the integrated circuit (IC) chip of the first chip to be model be 74HC595, the integrated circuit (IC) chip of the second chip to be model be 74HC195, adopts 74HC595 and 74HC195 to be that core is arranged in pairs or groups peripheral circuit.74HC595 achieves the parallel-serial conversion of the data of the control IC of Liquid Crystal Module, and control signal data are outputted to the control end of 74HC195 with the mode of operation of control 74HC195 by expansion mouth, the control signal that 74HC195 reception 74HC595 sends, processes the data of hall device in hall device metering circuit simultaneously and state obtains and the output of RS (order data is selected) control signal needed for control IC of Liquid Crystal Module.
The beneficial effect of technical solutions of the utility model is, solves the parallel-serial conversion simultaneously processing LCD MODULE and requires and can process the requirement of hall device status signal reading; IO takies few, takes up room little; For pure hardware circuit, do not need MCU, with low cost, stable performance.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the Liquid Crystal Module interface circuit of integrated Hall device in embodiment.
Fig. 2 is the circuit structure diagram of the Liquid Crystal Module interface circuit of integrated Hall device in embodiment.
Fig. 3 is the enlarged drawing of the second chip in Fig. 2.
Fig. 4 is the enlarged drawing of the first chip in Fig. 2.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, originally practical technical scheme is described in detail as follows.
With reference to Fig. 1, shown in Fig. 2, the Liquid Crystal Module interface circuit of the integrated Hall device of the present embodiment comprises hall device metering circuit, the translation interface docked with Liquid Crystal Module, primary processor and integrated circuit (IC) chip, integrated circuit (IC) chip comprises the first chip and the second chip, first chip and primary processor, translation interface is connected with the second chip, the data parallel-serial conversion of the first chip controls and Liquid Crystal Module, and control signal data are transferred out to the control end of the second chip, second chip is used for the detection data of hall device metering circuit and control signal to export to Liquid Crystal Module.
The integrated circuit (IC) chip of the first chip to be model be 74HC595, the integrated circuit (IC) chip of the second chip to be model be 74HC195, adopts 74HC595 and 74HC195 to be that core is arranged in pairs or groups peripheral circuit.74HC595 achieves the parallel-serial conversion of the data of the control IC of Liquid Crystal Module, and control signal data are outputted to the control end of 74HC195 with the mode of operation of control 74HC195 by expansion mouth, the control signal that 74HC195 reception 74HC595 sends, processes the data of hall device in hall device metering circuit simultaneously and state obtains and the output of RS (order data is selected) control signal needed for control IC of Liquid Crystal Module.
With reference to shown in Fig. 2, the line connection of wherein detailed circuit is as follows:
The serial data of translation interface is input to 74HC595 by serial input terminal SER and RCLK of 74HC595.
8 bit parallel data of the Q0-Q7 output terminal of the first chip 74HC595 are by inputting 8 6800 parallel port data port DB0-DB7 of primary processor SPLC780D after protection circuit current limliting.And utilize the expanded function mouth Q7 of 74HC595, by the 9th bit serial data, namely the RS control signal of Liquid Crystal Module sends into serial input terminal J and the/K of the second chip 74HC195.
Translation interface first connects a triode by an I/O port XAL, divide again and be separately connected to three hall devices, control signal is passed to hall device to control the duty opened or closed, the detection signal of three hall devices is inputted in 74HC195 by the parallel input port P0-P2 of 74HC195.The independent I/O port XP_LOAD of translation interface by 74HC195 /duty of PL control 74HC195, coordinate multiplexing clock signal SER, the RS control signal of Liquid Crystal Module sent into primary processor SPLC78D by Q1.The state of three hall devices is sent successively by the output terminal Q2 of 74HC195 chip and is exported by I/O port SEROUT.
Claims (3)
1. the Liquid Crystal Module interface circuit of an integrated Hall device, for the treatment of the voltage between hall device metering circuit and Liquid Crystal Module and data transmission, it is characterized in that, comprise hall device metering circuit, the translation interface docked with Liquid Crystal Module, primary processor and integrated circuit (IC) chip, described integrated circuit (IC) chip comprises the first chip and the second chip, first chip and primary processor, translation interface is connected with the second chip, the data parallel-serial conversion of the first chip controls and Liquid Crystal Module, and control signal data are transferred out to the control end of the second chip, second chip is used for the detection data of hall device metering circuit and control signal to export to Liquid Crystal Module.
2. the Liquid Crystal Module interface circuit of integrated Hall device according to claim 1, is characterized in that, the integrated circuit (IC) chip of described first chip to be model be 74HC595, the integrated circuit (IC) chip of the second chip to be model be 74HC195.
3. the Liquid Crystal Module interface circuit of integrated Hall device according to claim 1, it is characterized in that, described hall device metering circuit comprises three hall devices, hall device is controlled its duty by an IO control signal and triode, and the detection data of hall device are transferred to the second chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420850870.3U CN204288773U (en) | 2014-12-29 | 2014-12-29 | The Liquid Crystal Module interface circuit of integrated Hall device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420850870.3U CN204288773U (en) | 2014-12-29 | 2014-12-29 | The Liquid Crystal Module interface circuit of integrated Hall device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204288773U true CN204288773U (en) | 2015-04-22 |
Family
ID=52871908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420850870.3U Expired - Fee Related CN204288773U (en) | 2014-12-29 | 2014-12-29 | The Liquid Crystal Module interface circuit of integrated Hall device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204288773U (en) |
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2014
- 2014-12-29 CN CN201420850870.3U patent/CN204288773U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20171229 |