Semtech SX8652 4线和5线电阻触摸屏控制方案

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的精密高速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.本文介绍了SX8652主要特性, 简化方框图以及4线和5线触摸屏应用框图与SX8652 评估板电路图.

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.
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