CN204406377U - A kind of resistive touch screen driving circuit - Google Patents
A kind of resistive touch screen driving circuit Download PDFInfo
- Publication number
- CN204406377U CN204406377U CN201420798831.3U CN201420798831U CN204406377U CN 204406377 U CN204406377 U CN 204406377U CN 201420798831 U CN201420798831 U CN 201420798831U CN 204406377 U CN204406377 U CN 204406377U
- Authority
- CN
- China
- Prior art keywords
- touch screen
- electric resistance
- interface chip
- translation interface
- microprocessor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a kind of resistive touch screen driving circuit, the electric resistance touch screen translation interface chip that it comprises a microprocessor and is electrically connected with microprocessor, described electric resistance touch screen translation interface chip electrical connects touch screen circuitry; Described electric resistance touch screen translation interface chip comprises the power supply-metering circuit network of a multiway analog switch composition and the A/D converter of 12, described microprocessor is communicated by the Frame of Microwire with the digital interface of electric resistance touch screen translation interface chip, is also provided with interface circuit between described microprocessor and electric resistance touch screen translation interface chip.The utility model resistive touch screen driving circuit integrated level is high, the touch precision of cost raising touch-screen lower than traditional production cost when making production.
Description
Technical field
The utility model relates to touch-screen, relates to a kind of resistive touch screen driving circuit specifically.
Background technology
Touch-screen is one input equipment simply and easily, its application along with the development of information society more and more general.In order to easy to operate, people replace mouse or keyboard with touch-screen, carry out the input of regioselective information according to the position that stylus or finger are clicked.
At present on smart mobile phone, panel computer, the overwhelming majority all uses touch-screen as input equipment.Touch-screen is attached to the surface of display, detects the position that user clicks.Touch-screen produces the signal of a reflection user click location when user inputs.This signal normally simulating signal, it needs, by touch screen controller, simulating signal is converted to digital signal, namely the coordinate clicked of user, then gives processor and process.
In prior art, no matter be synchronous or asynchronous, during each display screen detected touch point, all need a corresponding chips respectively to drive, not only increase manufacturing cost, and integrated level is not high, under slim form generally pursued by electronic equipment instantly, the use desire of consumer will certainly be affected.
Therefore, find the resistive touch screen driving circuit that a kind of integration degree is high, cost is low, and will significant application value be had according to the touch screen terminal that this driving circuit obtains.
Utility model content
For deficiency of the prior art, the technical problems to be solved in the utility model there are provided the resistive touch screen driving circuit that a kind of integration degree is high, cost is low.
For solving the problems of the technologies described above, the utility model is realized by following scheme:
A kind of resistive touch screen driving circuit, the electric resistance touch screen translation interface chip that it comprises a microprocessor and is electrically connected with microprocessor, described electric resistance touch screen translation interface chip electrical connects touch screen circuitry; Described electric resistance touch screen translation interface chip comprises the power supply-metering circuit network of a multiway analog switch composition and the A/D converter of 12, described microprocessor is communicated by the Frame of Microwire with the digital interface of electric resistance touch screen translation interface chip, the electric capacity of X+, Y+, X-, Y-electrode electrical connection CON4 straight cutting connector of described electric resistance touch screen translation interface chip, 4 10nF, 4 electric capacity other ends link together and ground connection, are also provided with interface circuit between described microprocessor and electric resistance touch screen translation interface chip.
Further, described microprocessor model is PXA255, and described electric resistance touch screen translation interface chip model is ADS7843, is electrically connected with 74LCX374 trigger, 74LCX138 demoder in described interface circuit.
Further, the pin of D4, D5, D6 of described 74LCX374 trigger is electrically connected SA-D4, SA-D5, SA-D6 pin of PXA255 chip respectively, the leads ends of Q4, Q5, Q6 of 74LCX374 trigger is electrically connected DCLK, CS, DIN pin of ADS7843 chip respectively, the YO pin of the CLK pin electrical connection 74LCX138 demoder of 74LCX374 trigger.
Further, A, B, C tri-pins of described 74LCX138 demoder are electrically connected three pins of SA-A20, SA-A21, SA-A22 of PXA255 chip respectively.
Relative to prior art, the beneficial effects of the utility model are:
1. the utility model resistive touch screen driving circuit integrated level is high, when making production between cost lower than traditional production cost 10% ~ 15%.
2., after driving circuit integrated level improves by the utility model, saved the inner space of mobile phone, panel computer.
3. improve the touch precision of touch-screen.
Accompanying drawing explanation
Fig. 1 is the utility model touch-screen and microprocessor connection diagram.
Fig. 2 is the utility model electric resistance touch screen translation interface chip functions block diagram.
Fig. 3 is the utility model Y-coordinate instrumentation plan.
Fig. 4 is also provided with interface circuit figure between the utility model microprocessor and electric resistance touch screen translation interface chip.
Fig. 5 is the utility model electric resistance touch screen translation interface chip periphery circuit diagram.
Embodiment
Below in conjunction with drawings and Examples, the technical solution of the utility model is explained in detail.
Please refer to accompanying drawing 1 ~ 5, a kind of resistive touch screen driving circuit of the present utility model, the electric resistance touch screen translation interface chip 10 that it comprises a microprocessor 9 and is electrically connected with microprocessor 9, described microprocessor 9 is PXA255 chip, described electric resistance touch screen translation interface chip 10 is ADS7843 chip, and it is electrically connected touch screen circuitry 12, described electric resistance touch screen translation interface chip 10 comprises the power supply-metering circuit network of a multiway analog switch composition and the A/D converter 8 of 12, described microprocessor 9 is communicated by the Frame of Microwire with the digital interface of electric resistance touch screen translation interface chip 10, electric resistance touch screen translation interface chip 10 completes an A/D conversion and wants 24 clock period, front 8 clock period input 8 order of the bit control words from DIN pin, then the BUSY cycle of a clock is waited for, now BUSY pin can uprise, finally from a high position to low level, by turn export A/D transformation result from DOUT pin with 15 clock period.The electric capacity of X+, Y+, X-, Y-electrode electrical connection CON4 straight cutting connector 11,4 10nF of described electric resistance touch screen translation interface chip 10,4 electric capacity other ends link together and ground connection, are also provided with interface circuit between described microprocessor 9 and electric resistance touch screen translation interface chip 10.Described electric resistance touch screen translation interface chip 10 adopts the small-sized thin encapsulation of 16 pin, this chip has the A/D converter of 12, it is as the bridge communicated between touch-screen with CPU, can the analog voltage of touch-screen upper contact be converted to digital signal, thus accurately judge the coordinate position of contact.The supply voltage Vcc of ADS7843 chip is 2.7 ~ 5V, reference voltage V
rEF, be 1V ~+Vcc, the input range of changing voltage is 0 ~ V
rEF.Its supports single-ended and difference two kinds of metering systems, and most high conversion rate can reach 125kHz.
Please refer to accompanying drawing 1, two metal conducting layers of touch-screen are two workplaces of touch-screen, are usually called X workplace and Y workplace, respectively scribble an elargol, be called the pair of electrodes of this workplace at the two ends of each workplace.If apply voltage to the electrode pair of a workplace, then should can produce even, the parallel voltage's distribiuting of continuous print on workplace.The X workplace of four-wire type touch-screen and Y workplace have 4 extension lines, on the 1 pair of X electrode 1 being connected respectively to touch-screen and 1 pair of Y electrode 2.When the electrode pair in X-direction applies the voltage determined, and Y-direction electrode pair not making alive time, in the parallel voltage field of X, the magnitude of voltage at contact place can reflect on Y+ or Y-electrode, by measuring Y+ electrode voltage swing over the ground, the X-coordinate value of contact just can be learnt.In like manner, when at Y electrode pair making alive, and X electrode pair not making alive time, by measuring the voltage of X+ electrode, just can learn the Y-coordinate of contact.
The fluctuation that please refer to accompanying drawing 3, Vcc can cause the fluctuation of reference voltage, and this will cause the error of measurement.And under differential mode, even if Vcc fluctuates, the ratio of measurement point voltage (X+ voltage) and reference voltage (voltage between Y+, Y-pin) also still remains unchanged, and measurement result can not fluctuate, and greatly can improve the precision of measurement like this.
Please refer to accompanying drawing 4, in described interface circuit, be electrically connected with 74LCX374 trigger, 74LCX138 demoder.The pin of D4, D5, D6 of described 74LCX374 trigger is electrically connected SA-D4, SA-D5, SA-D6 pin of PXA255 chip respectively, the leads ends of Q4, Q5, Q6 of 74LCX374 trigger is electrically connected DCLK, CS, DIN pin of ADS7843 chip respectively, the YO pin of the CLK pin electrical connection 74LCX138 demoder of 74LCX374 trigger.A, B, C tri-pins of described 74LCX138 demoder are electrically connected three pins of SA-A20, SA-A21, SA-A22 of PXA255 chip respectively.
The utility model microprocessor 9 receives the A/D transformation result sended over from ADS7843.This result is 12 bit data, it reflects the logical coordinates value of touch-screen X-direction or Y-direction.These two logical coordinatess can change into screen coordinate after treatment.The reading of stylus coordinate or finger touch will through 2 A/D conversions.By sending different command word, X input channel and the Y input channel of A/D converter ADC module in gating touch screen controller sheet to be distinguished, read X-coordinate value and the Y-coordinate value of stylus respectively before and after microprocessor.The utility model reads precisely, microprocessor can not be made to produce the action of erroneous judgement, be arranged on pcb board, make the corresponding reduction in the inner space of mobile phone, panel computer, be more conducive to mobile phone, panel computer to thin type future development in multiple chipset.
The foregoing is only preferred implementation of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present utility model.
Claims (4)
1. a resistive touch screen driving circuit, it is characterized in that, the electric resistance touch screen translation interface chip (10) that it comprises a microprocessor (9) and is electrically connected with microprocessor (9), described electric resistance touch screen translation interface chip (10) electrical connection touch screen circuitry (12), described electric resistance touch screen translation interface chip (10) comprises the power supply-metering circuit network of a multiway analog switch composition and the A/D converter (8) of 12, described microprocessor (9) is communicated by the Frame of Microwire with the digital interface of electric resistance touch screen translation interface chip (10), the X+ of described electric resistance touch screen translation interface chip (10), Y+, X-, Y-electrode electrical connection CON4 straight cutting connector (11), the electric capacity of 4 10nF, 4 electric capacity other ends link together and ground connection, also interface circuit is provided with between described microprocessor (9) and electric resistance touch screen translation interface chip (10).
2. a kind of resistive touch screen driving circuit according to claim 1, it is characterized in that: described microprocessor (9) model is PXA255, described electric resistance touch screen translation interface chip (10) model is ADS7843, is electrically connected with 74LCX374 trigger, 74LCX138 demoder in described interface circuit.
3. a kind of resistive touch screen driving circuit according to claim 2, it is characterized in that: the pin of D4, D5, D6 of described 74LCX374 trigger is electrically connected SA-D4, SA-D5, SA-D6 pin of PXA255 chip respectively, the leads ends of Q4, Q5, Q6 of 74LCX374 trigger is electrically connected DCLK, CS, DIN pin of ADS7843 chip respectively, the YO pin of the CLK pin electrical connection 74LCX138 demoder of 74LCX374 trigger.
4. a kind of resistive touch screen driving circuit according to claim 2, is characterized in that: A, B, C tri-pins of described 74LCX138 demoder are electrically connected three pins of SA-A20, SA-A21, SA-A22 of PXA255 chip respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420798831.3U CN204406377U (en) | 2014-12-17 | 2014-12-17 | A kind of resistive touch screen driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420798831.3U CN204406377U (en) | 2014-12-17 | 2014-12-17 | A kind of resistive touch screen driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204406377U true CN204406377U (en) | 2015-06-17 |
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ID=53430219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420798831.3U Expired - Fee Related CN204406377U (en) | 2014-12-17 | 2014-12-17 | A kind of resistive touch screen driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204406377U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105929732A (en) * | 2016-04-25 | 2016-09-07 | 成都五方传奇物联网技术有限公司 | Touch signal processing circuit |
-
2014
- 2014-12-17 CN CN201420798831.3U patent/CN204406377U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105929732A (en) * | 2016-04-25 | 2016-09-07 | 成都五方传奇物联网技术有限公司 | Touch signal processing circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160513 Address after: 518103, Shenzhen, Guangdong, Fuyong Baoan District Street on the south side of Great Ocean Road fourth, 1 Patentee after: Dijing Optoelectronics (Shenzhen) Co.,Ltd. Address before: 518108 A5 building, Phoenix third industrial park, Fuyong street, Guangdong, Shenzhen, Patentee before: SHENZHEN DJN OPTRONICS Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20211217 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |