AD7879/AD7889 is a low voltage touch screen controller, supports 4-wire touch screen interface, 1.6V to 3.6V operating voltage, programmable conversion parameters, optional GPIO interrupt outputs, touch pressure measurement, supports shutdown mode, and has 12-ball, 1.6 mm × 2 mm WLCSP and 16-lead, 4 mm × 4 mm LFCSP packages
The AD7879/AD7889 series are 12‑bit successive‑approximation ADCs designed for 4‑wire resistive touch‑screen interfaces. They operate from a single 1.6 V to 3.6 V supply, provide up to 105 kSPS throughput, and include programmable median and averaging filters, temperature and touch‑pressure measurement, and a shutdown mode drawing less than 6 µA.
Typical applications include personal digital assistants, handheld devices, point‑of‑sale terminals, medical devices, and cell phones. The devices are offered in 12‑ball WLCSP and 16‑lead LFCSP packages and support both SPI and I²C serial interfaces.
| Supply voltage (VCC) | 1.6 V to 3.6 V |
|---|---|
| Resolution | 12 bits |
| Throughput rate | 105 kSPS |
| Shutdown current | ≤ 6 µA |
| Operating temperature range | −40 °C to +85 °C |
| Analog input voltage range | 0 V to VCC |
The device operates from 1.6 V up to 3.6 V.
Both SPI and I²C interfaces are supported, with separate pin configurations for each mode.
The shutdown mode draws a maximum of 6 µA.
The ADC can achieve a throughput of 105 kSPS.