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- Brand
- Belling
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- BL0937
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- Last added
- 2026-10-03
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Belling BL0937 Smart Socket Metering Chip Application Guide
The BL0937 is a compact SOP‑8 chip designed for energy measurement in smart‑socket applications. It offers a wide measurement range, low power consumption and simple external circuitry.
The document provides detailed pin descriptions, calibration procedures, formulas for converting pulse frequencies to power, a parts list and practical PCB layout recommendations to ensure accurate measurements and reliable operation. This manual is written in Chinese.
Belling BL0937 specifications
| Measurement range | 5 mA ~ 20 A (1 W ~ 2500 W) |
|---|---|
| Power consumption | 1.7 mA |
| Signal response time | <300 ms |
| Startup current | 2 mA |
| Operating voltage | 3.3 V |
| Voltage drop protection | 2.7 V ± 50 mV |
| Effective‑value switch wait time | <10 µs |
| VDD pin voltage | +3.3 V (3.0 V ~ 3.6 V normal) |
| IP/IN differential voltage | ±50 mV |
| VP differential voltage | ±200 mV |
| CF1 pulse width | 38 µs (frequency proportional to power) |
Source: Belling BL0937 Smart Socket Metering Chip Application Guide
All Belling BL0937 documents by type
How to use the product for one specific task, with worked examples.
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
How should the BL0937 be calibrated?
Use a single‑point calibration: apply a rated voltage and current, measure the corresponding CF, CF1 and P pulse frequencies, then compute voltage, current and power conversion coefficients (Ku, Ki, Kp) for use in the system software.
From: Belling BL0937 Smart Socket Metering Chip Application Guide
What does the CF1 pin output?
CF1 provides an active‑power high‑frequency pulse with a fixed 38 µs width; its frequency is proportional to the measured power, and it also indicates over‑current with a 6.78 kHz pulse.
From: Belling BL0937 Smart Socket Metering Chip Application Guide
What supply voltage range does the BL0937 require?
The chip operates with VDD between 3.0 V and 3.6 V.
From: Belling BL0937 Single-Phase Socket Metering Chip Datasheet
How is over‑current indicated by the BL0937?
When an over‑current condition occurs, the CF pin outputs a 6.78 kHz pulse.
From: Belling BL0937 Single-Phase Socket Metering Chip Datasheet