BL BL0939

BL0939 is a built-in clock, calibration-free energy metering IC suitable for single-phase multi-function energy meters, smart sockets, smart home appliances, e-bike charging stations, and other applications, offering high cost-effectiveness. BL0939 integrates 3 high-precision Sigma-Delta ADCs, capable of simultaneously measuring 2 current channels and 1 voltage channel. BL0939 can measure RMS current, RMS voltage, active power, active energy, and other parameters. It supports fast RMS current output (for leakage monitoring or overcurrent protection), temperature detection, waveform output, and other functions. Data is output via UART/SPI interface, fully meeting the requirements of smart sockets, smart home appliances, single-phase multi-function energy meters, e-bike charging stations, and large-scale electricity data collection applications. BL0939 features a patented anti-creep design that, combined with appropriate external hardware design, ensures noise power is not counted into energy pulses when no current is present.

• Three independent Sigma-Delta ADCs for measuring two current channels and one voltage channel
• RMS current range (10mA~35A) @1mohm
• Active energy (1W~7700W) @1mohm @220V
• Outputs: RMS current, RMS voltage, fast RMS current, active power, current/voltage waveform phase angle
• Batch factory gain error <1%; calibration-free under specified peripheral component conditions
• Both current channels feature leakage/overcurrent monitoring with configurable threshold and response time
• Voltage zero-crossing signal output
• Built-in waveform registers with waveform data output for load type analysis
• Integrated temperature sensor for on-chip over-temperature monitoring, high-current node preset temperature alarm, and ambient temperature measurement
• Integrated SPI (max rate 900KHz) / UART (4800bps) communication; UART supports multi-chip addressed communication (SSOP20L package)
• Internal power loss detection; chip enters reset state when supply drops below 2.7V
• Built-in 1.218V reference voltage source
• Built-in oscillator circuit, clock ~4MHz
• Single supply voltage 3.3V, low power consumption 10mW (typical)
• SSOP20L / SOP16L package

• Single-phase multi-function energy meter
• Smart socket
• Smart home appliance
• Electric bicycle charging station
• Large-scale power consumption data acquisition