The FS9922-DMM4 is a dual‑mode measurement IC that combines a high‑precision ADC with an 8‑bit microcontroller. It provides a wide range of measurement functions, including voltage, current, resistance, capacitance, frequency, temperature and speed, all selectable via on‑chip pins.
The device operates from 2.4 V to 3.6 V, draws about 2 mA in active mode and as little as 5 µA in standby. Communication is available through an RS‑232 interface (2400 bps) and the unit includes LCD driver, backlight control and buzzer output. This manual is written in Chinese.
| Maximum display counts | 6000 (9999) |
|---|---|
| Number of display steps | 61 |
| Operating voltage range | 2.4 V – 3.6 V |
| Supply current (active) | 2 mA |
| RS‑232 output speed | 2400 bps |
| Voltage measurement range | 60 mV – 6000 V |
| Current measurement range | 600 µA – 6000 A |
| Resistance measurement range | 600 Ω – 6000 MΩ |
| Capacitance measurement range | 40 nF – 4000 µF (30 s) |
| Frequency measurement range | 9.999 Hz – 999.9 MHz |
| Temperature measurement range | -273 °C – +400 °C |
It operates from 2.4 V to 3.6 V.
The active supply current is about 2 mA.
The chip includes an RS‑232 interface that operates at 2400 bps.