The FS9922-DMM3 is a high‑performance, low‑power 4,000‑count digital multimeter dedicated IC with an integrated 8‑bit microcontroller. It combines dual‑mode ADCs, a band‑gap reference, LCD driver, and various measurement functions such as voltage, current, resistance, capacitance, frequency, duty‑cycle, temperature, diode, and transistor testing.
The device operates from 2.4 V to 3.6 V, consumes less than 3 mA in active mode and only about 10 µA in sleep mode, and supports RS‑232 data output at 2400 bps. It is offered in a 98‑pin bare die and a 100‑pin QFP package, making it suitable for handheld and portable multimeter designs. This manual is written in Chinese.
| Display resolution | 4000 counts (frequency up to 9999) |
|---|---|
| Operating voltage | 2.4 V – 3.6 V |
| Supply current (DCV mode) | 1.5 – 3 mA |
| Sleep current | 10 µA |
| RS232 baud rate | 2400 bps |
| Operating temperature range | 0 °C – +70 °C |
| Package | 98‑pin bare die, 100‑pin QFP |
| Bar graph segments | 41 segments |
The device enters sleep mode after 15 minutes of inactivity, and this feature can be disabled.
RS232 data is transmitted at 2400 bps.
The IC operates from 2.4 V up to 3.6 V.
It provides a 4,000‑count display (up to 9,999 for frequency measurements).