CN205247349U

CN205247349U - Touch -sensitive screen communication control interface circuit

Info

Publication number: CN205247349U
Application number: CN201521045852.9U
Authority: CN
Inventors: 张清霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-15
Filing date: 2015-12-15
Publication date: 2016-05-18
Anticipated expiration: 2025-12-15

Abstract

The utility model discloses a touch -sensitive screen communication control interface circuit, X+ and triode VT4 including control chip U1, triode VT1, touch -sensitive screen, control chip U1 pin PA1 connecting resistance R6, the Y+ and the triode VT3 collecting electrode of touch -sensitive screen are connected respectively to the resistance R6 other end, triode VT3 base is passed through resistance R5 and is connected chip U1 pin PA8, triode VT3 projecting pole connect respectively VCC and triode VT4 projecting pole, triode VT4 base is passed through resistance R7 and is connected chip U1 pin PA11, the X+ of touch -sensitive screen is connected respectively to triode VT4 collecting electrode, diode D1 negative pole and resistance R8, chip U1 pin PA2 is connected to the resistance R8 other end. The utility model discloses touch -sensitive screen communication control interface circuit realizes the touch panel controller function through being connected with the touch -sensitive screen is direct control chip STM32F103F103 through the IO mouth of self, has simplified the circuit, makes the circuit small, with low costs, and application scope is wide.

Description

A kind of touch-screen communication control interface circuit

Technical field

The utility model relates to a kind of communication interface circuit, specifically a kind of touch-screen communication control interface circuit.

Background technology

Touch screen is called again contact panel, is an induction type liquid crystal indicator that can receive the input signals such as contact, works as contactWhen graphic button on screen, the haptic feedback system on screen can drive various links dresses according to the formula of programming in advancePut, can be in order to replace mechanical push button panel, and produce lively visual and sound effects by liquid crystal display picture. SamuelDoctor Hurst has invented a touch sensor in 1971, this sensor is exactly the blank of touch screen, after 3 years, heDesign the transparent touch screen of first item. 1977, touch screen technology obtained very large improvement, until today is still at quiltBe widely used and develop rapidly.

Universal along with portable set, touch-screen has become people's indispensable part of living, along with portable equipmentMiniaturization development, the exploration that the communication interface of touch-screen is optimized never stops.

Utility model content

The purpose of this utility model is to provide a kind of touch-screen communication control interface circuit, carries to solve in above-mentioned background technologyThe problem going out.

For achieving the above object, the utility model provides following technical scheme:

A kind of touch-screen communication control interface circuit, comprises X+ and the triode of control chip U1, triode VT1, touch-screenVT4, described control chip U1 pin PA1 contact resistance R6, resistance R 6 other ends connect respectively Y+ and three utmost points of touch-screenPipe VT3 colelctor electrode, triode VT3 base stage connects chip U1 pin PA8 by resistance R 5, and triode VT3 emitter stage dividesDo not connect power supply VCC and triode VT4 emitter stage, triode VT4 base stage connects chip U1 pin PA11 by resistance R 7,Triode VT4 colelctor electrode connects respectively X+, diode D1 negative pole and the resistance R 8 of touch-screen, and resistance R 8 other ends connectChip U1 pin PA2, the X+ other end of touch-screen connects respectively X-and the touch-screen of the Y+ other end of touch-screen, touch-screenY-, the other end connecting triode VT1 colelctor electrode of the X-of touch-screen, triode VT1 base stage connects by resistance R 12Chip U1 pin PA9, triode VT1 grounded emitter, the Y-other end connecting triode VT2 current collection of described touch-screenThe utmost point, triode VT2 base stage connects chip U1 pin PA10 by resistance R 9, and triode VT2 emitter stage is contact resistance respectivelyR10 and resistance R 11, resistance R 10 other ends connect power supply VCC, and resistance R 11 other ends connect respectively diode D1 positive poleWith chip U1 pin PA3; Described chip U1 adopts STM32F103F103.

As further scheme of the utility model: described power supply VCC voltage is 3.3V.

Compared with prior art, the beneficial effects of the utility model are: the utility model touch-screen communication control interface circuit is logicalCross control chip STM32F103F103 is directly connected by the I/O mouth of self with touch-screen, realize touch screen controller meritCan, simplify circuit, make circuit volume little, cost is low, applied widely.

Brief description of the drawings

Fig. 1 is a kind of circuit diagram of touch-screen communication control interface circuit.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out clearlyChu, intactly description, obviously, described embodiment is only the utility model part embodiment, instead of wholeEmbodiment. Based on the embodiment in the utility model, those of ordinary skill in the art are not making under creative work prerequisiteThe every other embodiment obtaining, belongs to the scope that the utility model is protected.

Refer to Fig. 1, in the utility model embodiment, a kind of touch-screen communication control interface circuit, comprise control chip U1,The X+ of triode VT1, touch-screen and triode VT4, described control chip U1 pin PA1 contact resistance R6, resistance R 6The other end connects respectively Y+ and the triode VT3 colelctor electrode of touch-screen, and triode VT3 base stage connects chip by resistance R 5U1 pin PA8, triode VT3 emitter stage connects respectively power supply VCC and triode VT4 emitter stage, triode VT4 base stageConnect chip U1 pin PA11 by resistance R 7, triode VT4 colelctor electrode connects respectively X+, the diode D1 of touch-screenNegative pole and resistance R 8, resistance R 8 other ends connect chip U1 pin PA2, and the X+ other end of touch-screen connects respectively touch-screenThe Y+ other end, the X-of touch-screen and the Y-of touch-screen, the other end connecting triode VT1 colelctor electrode of the X-of touch-screen,Triode VT1 base stage connects chip U1 pin PA9, triode VT1 grounded emitter, described touch-screen by resistance R 12Y-other end connecting triode VT2 colelctor electrode, triode VT2 base stage connects chip U1 pin PA10 by resistance R 9,Triode VT2 emitter stage is contact resistance R10 and resistance R 11 respectively, and resistance R 10 other ends connect power supply VCC, resistance R 11The other end connects respectively diode D1 positive pole and chip U1 pin PA3; Described chip U1 adopts STM32F103F103; InstituteStating power supply VCC voltage is 3.3V.

Operation principle of the present utility model is: refer to Fig. 1, pin PA8, the PA9 of control chip U1, PA10, PA11 divideNot as the control end of four triode VT1～VT4, by controlling the break-make of triode VT1～VT4, control touch-screenY+, Y-, X+, X-, PA1, PA2 are two A/D ALT-CH alternate channels, connect respectively Y+ and X+ for calculating the X of touch pointWith Y coordinate. PA3 connect internal interrupt whether have touch action for detection of touch-screen, when touch-screen moves at ordinary times, make PA8,PA9, PA11 export 0, PA10=1, only allow VT2 conducting.

In the time having touch action, D1 conducting is to interrupt signal of PA3, and STM32F103 puts after receiving interrupt requests immediatelyPA8=1, conducting VT1 just adds voltage like this in Y+, Y-direction, starts A/D ALT-CH alternate channel PA2 simultaneously, passes throughThe upper voltage of input X+ calculates the Y coordinate of touch point, and then in like manner making PA8, PA10 is that 0, PA9, PA11 are 1, opensMove A/D ALT-CH alternate channel PA1, calculate the coordinate of touch point X by the upper voltage of input Y+.

To those skilled in the art, obviously the utility model is not limited to the details of above-mentioned example embodiment, Er QieDo not deviate from the situation of 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, this practicality is newThe scope of type is limited by claims instead of above-mentioned explanation, is therefore intended to be equal to containing of important document by what drop on claimAll changes in justice and scope are included in the utility model. Any Reference numeral in claim should be considered as to restrictionRelated claim.

In addition although should be appreciated that this description is described according to embodiment, be not that each embodiment only comprises,A technical scheme independently, this narrating mode of description is only for clarity sake, those skilled in the art should be byDescription is done as a whole, and the technical scheme in each embodiment also can be through appropriately combined, and forming those skilled in the art canWith other embodiments of understanding.

Claims

1. a touch-screen communication control interface circuit, comprises X+ and three utmost points of control chip U1, triode VT1, touch-screenPipe VT4, is characterized in that, described control chip U1 pin PA1 contact resistance R6, and resistance R 6 other ends connect respectively tactileY+ and the triode VT3 colelctor electrode of touching screen, triode VT3 base stage connects chip U1 pin PA8, three utmost points by resistance R 5Pipe VT3 emitter stage connects respectively power supply VCC and triode VT4 emitter stage, and triode VT4 base stage connects by resistance R 7Chip U1 pin PA11, triode VT4 colelctor electrode connects respectively X+, diode D1 negative pole and the resistance R 8 of touch-screen,Resistance R 8 other ends connect chip U1 pin PA2, and the X+ other end of touch-screen connects respectively the Y+ other end of touch-screen, touchesTouch the X-of screen and the Y-of touch-screen, the other end connecting triode VT1 colelctor electrode of the X-of touch-screen, triode VT1 base stageConnect chip U1 pin PA9 by resistance R 12, triode VT1 grounded emitter, the Y-other end of described touch-screen connectsConnect triode VT2 colelctor electrode, triode VT2 base stage connects chip U1 pin PA10 by resistance R 9, and triode VT2 sends outEmitter-base bandgap grading is contact resistance R10 and resistance R 11 respectively, and resistance R 10 other ends connect power supply VCC, and resistance R 11 other ends respectivelyConnect diode D1 positive pole and chip U1 pin PA3; Described chip U1 adopts STM32F103F103.

2. a kind of touch-screen communication control interface circuit according to claim 1, is characterized in that described power supply VCCVoltage is 3.3V.