Description:

BL0939 is a special chip for power measurement in the field of smart home, supporting two-channel measurement, which can be used for metering and leakage fault detection at the same time.

Leakage detection current can be set, fast response time, small size, simple peripheral circuit, low cost.

Features:

 Three independent Sigma-Delta ADCs for measuring two currents and one voltage. 

 Current RMS range (10mA~35A) @1mohm 

 Active power (1w~7700w)@1mohm 

 Can output current, voltage rms, fast current rms, active power, current and voltage waveform phase angle 

 Batch factory gain error is less than 1%, peripheral components to meet certain conditions can be calibration-free 

 Two current channels are equipped with leakage / overcurrent monitoring function, monitoring threshold and response time can be set 

 Voltage zero signal output 

 Built-in waveform register, waveform data can be output for load type analysis. 

 Integrated temperature sensor to meet the product's own over-temperature monitoring, high-current node preset temperature alarm, ambient temperature measurement, etc.

Requirements 

 Integrated SPI (the fastest rate support 900KHz) and UART (4800Bps) communication interface, UART communication mode supports multi-chip communication (SSD only).

Support multi-chip communication (SSOP20L package only). 

 Power down monitoring, chip reset when below 2.7V. 

 Built-in 1.218V reference voltage source. 

 Built-in oscillator circuit with approx. 4MHz clock. 

 Chip single operating supply 3.3V, low power consumption 10mW (typical)