嵌入式系统原理与设计 教学课件 作者 蒋建春 主编 ads7843.pdfVIP

® ADS7843 TOUCH SCREEN CONTROLLER FEATURES DESCRIPTION 4-WIRE TOUCH SCREEN INTERFACE The ADS7843 is a 12-bit sampling analog-to-digital RATIOMETRIC CONVERSION converter (ADC) with a synchronous serial interface SINGLE SUPPLY: 2.7V to 5V and low on-resistance switches for driving touch screens. Typical power dissipation is 750µW at a UP TO 125kHz CONVERSION RATE 125kHz throughput rate and a +2.7V supply. The SERIAL INTERFACE reference voltage (VREF) can be varied between 1V and PROGRAMMABLE 8- OR 12-BIT RESOLUTION +VCC, providing a corresponding input voltage range of 0V to V . The device includes a shutdown mode 2 AUXILIARY ANALOG INPUTS REF which reduces typical power dissipation to under FULL POWER-DOWN CONTROL 0.5µW. The ADS7843 is guaranteed down to 2.7V operation.