The FM7843 touchscreen controller from Fudan Microelectronics is a 12‑bit ADC with serial interface, low‑power shutdown mode, and detailed electrical…
The FM7843 is a four‑wire resistive touchscreen controller featuring a 12‑bit analog‑to‑digital converter, synchronous serial data interface, and built‑in touchscreen driver. It operates from 2.7 V to 5.0 V and includes a shutdown mode that reduces power consumption to 0.5 µW, making it suitable for PDA and portable device applications.
The datasheet provides pin assignments, electrical parameters, package options (TSSOP‑16 and QFN‑16), and application circuit examples. Key performance figures include a 125 kHz conversion rate, 12‑bit resolution, and typical power consumption of 1.8 mW. This manual is written in Chinese.
| Operating Voltage | 2.7 V – 5.0 V |
|---|---|
| Resolution | 12 bits |
| Conversion Rate | 125 kHz |
| Typical Power Consumption | 1.8 mW |
| Shutdown Current | 3 µA |
The FM7843 operates from 2.7 V to 5.0 V.
The device can convert at up to 125 kHz.
In shutdown mode the power consumption drops to about 0.5 µW.