Data sheet for the AD7879/AD7889 low‑voltage touch‑screen controller, detailing specifications, pinout, and interface options.
The AD7879 and AD7889 are 12‑bit SAR ADCs designed to drive 4‑wire resistive touch screens. They operate from a single 1.6 V to 3.6 V supply and provide low‑on‑resistance switches for touch‑screen interfacing. Built‑in preprocessing includes median and average filters to reduce LCD and external noise.
The devices support both SPI and I²C serial interfaces, offer programmable conversion parameters, and include optional auxiliary inputs for battery monitoring or general‑purpose I/O. They are available in compact WLCSP and LFCSP packages suitable for handheld and portable applications. This manual is written in Chinese.
| Supply voltage (VCC) | 1.6 V to 3.6 V |
|---|---|
| Resolution | 12‑bit SAR ADC |
| Throughput rate | 105 kSPS |
| Shutdown mode current | ≤ 6 µA |
| Operating temperature range | -40 °C to +85 °C |
| Package options | 12‑pin WLCSP (1.6 mm×2 mm) or 16‑pin LFCSP (4 mm×4 mm) |
| Supported serial interfaces | SPI or I²C |
The devices operate from a single supply of 1.6 V to 3.6 V.
The ADC can convert up to 105 kSPS.
Both SPI and I²C interfaces are available, depending on the part variant.
In shutdown mode the current consumption is no more than 6 µA.