The Fortune Semiconductor FS9721_LP3 manual details features, pinout, specifications, and application guidance for the 4000‑count digital multimeter IC.
The FS9721_LP3 is a high‑performance, low‑power 3 ¾‑digit (4000 counts) integrated circuit that combines an 8‑bit microprocessor with ADC, analog front‑end, and LCD driver functions. It is intended for use in digital multimeters and panel meters, providing a wide range of measurement capabilities.
The document covers the chip’s features, measurement types, pin descriptions, electrical specifications, RS‑232 interface, LCD display operation, package dimensions, and procurement information, along with revision history and application notes. This manual is written in Chinese.
| Maximum display counts | 4000 (frequency 4999) |
|---|---|
| Conversion rate | 3 conversions per second |
| Operating voltage | 2.4 V – 3.6 V |
| Operating current | ≤ 1 mA |
| Automatic shutdown (sleep) time | 30 minutes |
| Buzzer frequency | ~ 2.7 kHz |
| RS‑232 data rate | 2400 bps |
The recommended supply voltage is 2.4 V to 3.6 V.
The IC is offered in a 100‑pin QFP package.