Semtech SX865x系列4或5线电阻触摸屏控制方案
Semtech公司的SX865x系列(SX8654, SX8655和SX8656)是4/5线电阻触摸屏控制器,低电压2.3V-3.6V工作,低功耗,关断电流仅0.4uA,器件集成了LDO稳压器,4/5线触摸屏接口,精密的比率12位ADC,高达5000(X-Y)座标/秒.主要用在游戏机,手提音乐设备,手机,DSC,DVR,POS/POI终端和触摸屏监视器.本文介绍了SX865x系列主要特性和方框图, 接近检测接口框图,以及模拟前端(AFE)框图, 触摸接口框图和应用框图,典型应用电路框图推荐外接元件数值表.
The SX8654, SX8655 and SX8656 belong to a family of high performance haptics enabled 4/5-wire resistive touch screen controller with proximity detection, optimized for hand held applications such as mobile phones, portable music players, game machines, point-of-sales terminal and other consumer and industrial applications. They feature a wide input supply range from 2.3V to 3.6V. The controller computes touch screen X-Y coordinates and touch pressure with a precision, low power 12-bit analog-digital converter. On-chip data averaging processing algorithms can be activated to reduce host activity and suppress system noise. The processing core features low power modes which intelligently minimize current in operation as well as in automatic shut-down.
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