The BL0937 is a single‑phase metering IC designed for smart sockets, power strips and other single‑phase appliance control circuits. It integrates two high‑precision sigma‑delta ADCs, reference voltage, power‑management circuits and digital signal processing to output voltage and current RMS values as high‑frequency pulses.
The document provides pin definitions, electrical parameters, typical application circuits, calibration guidance and a BOM. Key features include a 3.3 V supply, SOP‑8 package, built‑in 1.218 V reference, anti‑drift design, and fast over‑current detection with a 6.78 kHz pulse output. This manual is written in Chinese.
| Supply voltage (VDD) range | 3.0 V – 3.6 V |
|---|---|
| IP/IN input differential voltage range | ±50 mV |
| VP input differential voltage range | ±200 mV |
| Current measurement range | 4 mA – 30 A @ 1 mΩ |
| Non‑linearity error | < ±0.5 % |
| Typical power consumption | 6 mW |
| Reference voltage | 1.218 V |
| Built‑in clock frequency | ~2 MHz |
| Package | SOP‑8 |
| Over‑current detection pulse frequency | 6.78 kHz |
The chip operates with VDD between 3.0 V and 3.6 V.
When an over‑current condition occurs, the CF pin outputs a 6.78 kHz pulse.
The internal reference voltage is 1.218 V.