1.Function Introduction

BL0942 is a built-in clock calibration-free energy metering IC, which is suitable for single-phase multifunction electricity meters, smart sockets, smart home appliances and other applications, with more costefficient solution.

BL0942 incorporates two sigma delta ADC with a high accuracy energy measurement core. It measures line voltage and current and calculate active energy as well as instantaneous voltage and current.

BL0942 provides access to on-chip registers via UART/SPI interfaces. One configurable low jitter pulse output Pin provide pulse that is proportional to active energy. Zero-crossing voltage (ZX_V), zero-crossing current (ZX_I) and overcurrent are accessible via the external pin.

BL0942 has a patent active power no-load detection to prevent meter-creep.

2.Features

n Two independent Sigma-Delta ADC, one current and one voltage.

n Less than 0.1% error in active energy measurement over a dynamic range of 4000:1

n Current RMS range (10mA ~ 30A) @ 1mOhm

n Measure current, voltage RMS, fast current RMS, active power, sampled waveform

n The batch factory gain error is less than 1%, and the peripheral components can be free of calibration under certain conditions

n Programmable over-current detection

n ZX_V/ZX_I output

n Provide sampled waveform data for load type analysis

n SPI (maximum speed 900kHz)/ UART (4800~38400bps) communication

n On-chip power supply monitor

n On-chip reference 1.218v(typical)

n On-chip oscillator as clock source

n Single 3.3V supply, low power consumption 10mW (typical)

n SSOP10L/TSSOP14L package