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Semtech公司的SX8652是非常低功耗高度可靠的 4线和5线电阻触摸屏控制器,输入电压从1.65V到3.7V,具有工作在74KSPS的细密高速12位SAR ADC,吞吐量为5000(X-Y)座标/秒.关断模式小于1uA,SPI串行接口.主要应用在手机,数码相机,激光打印机和MP3播放器.本京电港论坛文章先容了SX8652主要特点, 简化方框架图以及4线和5线触摸屏应用框架图与SX8652 评估板电路原理图纸. The SX8652 is a very low power, high reliability controller for 4-wire and 5-wire resistive touch screens used in PDAs, portable instruments and point-of-sales terminal applications. It features a wide input supply range from 1.65V to 3.7V and low power modes to preserve current when the screen is unintentionally touched. To compute touch screen X-Y coordinates and touch pressure with precision, a low power 12-bit analog-digital converter is activated with the possibility to enable on-chip data averaging processing algorithms to reduce host activity and suppress system noise. The touch screen controller inputs have been specially designed to provide robust on-chip ESD protection of up to ±15kV in both HBM and Contact Discharge, and eliminates the need for external protection devices. The SX8652 is controlled by a high speed SPI™ serial interface. The SX8652 is available in a 4.0 mm x 3.0 mm 14-DFN package and a 1.5 mm x 2.0 mm wafer level chip scale package (WLCSP) for space conscience applications. Extremely Low Power Consumption: 23uA@1.8V 8kSPS Superior On-chip ESD Protection _±15kV HBM (X+,X-,Y+,Y-) _±2kV CDM _±25kV Air Gap Discharge _±15kV Contact Discharge _±300V MM SX86524主要特点: Single 1.65V to 3.7V Supply/Reference 4-Wire or 5-Wire Resistive Touch Screen Interface Integrated PrEPROcessing Block to Reduce Host Loading and Bus Activity Four User Programmable Operation Modes provides Flexibility to address Different Application Needs _Manual, Automatic, Pen Detect, Pen Trigger Low Noise Ratiometric Conversion Precision, High Speed 12-bit SAR ADC Operating At 74k SPS Throughput: 5000 (X-Y) coordinates/second (c/s) with 7-Sample Averaging Low Power Shut-Down Mode < 1uA SPI™ Serial Interface Touch Pressure Measurement (4-Wire) Auxiliary Input (4-Wire) For Alternate ADC Input or Start of Conversion Trigger Hardware & Software reset -40℃ to +85℃ operation Pb-Free, Halogen Free, RoHS/WEEE compliant product Windows CE 6.0, Linux Driver Support Available Packages: 14-LD (4.0 mm x 3.0 mm) DFN 12-Ball (1.5 mm x 2.0 mm) WLCSP SX86524应用: Cell Phone Digital Still Camera Laser Printer MP3 Player
SX8652 评估板 The SX8652EVK is the board for evaluation of the 4/5 wire resistive touch screen controller SX8652. It is provided with a 4-wire touch screen to ease the evaluation. No external supply is needed to power the board. A USB cable is provided to connect the EVK to a Windows based PC for operation of the software. The evaluation kit is composed of the following parts: i) The board with the SX8652 and the touch screen on the top ii) A USB cable to connect the board to the PC iii) A CDROM with the installation files and the user guide iv) A stylus to write on the touch screen This evaluation board contains the following main components that can be identified from the schematics in section SX8652 in DFN package FT2232D with the quartz : USB to SPI controller M93C46 EEPROM : USB initialization information SN74LVC8T245 : Level shifter SC1563:Regulator for 3.3V and 1.85V 4-wire touchscreen connected in J5
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