ST STMPE811电阻触摸屏控制方案
ST公司的STMPE811是GPIO端口扩展器,能通过I2C双向总线和数字ASIC进行接口,它的每个I/O口可配置成输入,输出或特别功能,可叫醒.器件工作电压1.8-3.3V,集成了4线触摸屏控制器,8输入12位ADC,SPI和I2C接口,128深度缓冲触摸屏控制器和触摸屏控制器运动算法,主要用`在PMP,GPS,手机和智能手机以及游戏机.本文介绍了STMPE811主要特性, 功能方框图, 触摸屏控制器方框图以及STEVAL-ICB004V1演示套件主要特性,电路图和材料清单.
The STMPE811 is a GPIO (general purpose input/output) port expander able to interface a main digital ASIC via the two-line bidirectional bus (I2C). A separate GPIO expander is often used in mobile multimedia platforms to solve the problems of the limited amount of GPIOs typically available on the digital engine.
The STMPE811 offers great flexibility, as each I/O can be configured as input, output or specific functions. The device has been designed with very low quiescent current and includes a wakeup feature for each I/O, to optimize the power consumption of the device.
A 4-wire touchscreen controller is built into the STMPE811. The touchscreen controller is
enhanced with a movement tracking algorithm (to avoid excessive data), a 128 x 32 bit buffer and programmable active window feature.
STMPE811主要特性:
■ 8 GPIOs
■ 1.8 - 3.3 V operating voltage
■ Integrated 4-wire touchscreen controller
..
