BL BL0940

BL0940 is a clock-embedded, calibration-free energy metering IC designed for applications such as single-phase multi-function energy meters, smart sockets, smart home appliances, and electric bicycle charging stations, offering excellent cost-performance ratio. BL0940 integrates two high-precision Sigma-Delta ADCs along with analog circuit modules including a voltage reference and power management, as well as DSP circuits for processing electrical parameters such as active power, RMS current, and RMS voltage. BL0940 is capable of measuring RMS current, RMS voltage, active power, active energy, and other parameters. It also supports fast RMS current output (for leakage monitoring or overcurrent protection), temperature detection, waveform output, and data transmission via UART/SPI interface — fully meeting the requirements of smart sockets, smart home appliances, single-phase multi-function energy meters, electric bicycle charging stations, and large-scale power consumption data acquisition applications. BL0940 features a patented anti-creep design that, combined with proper external hardware design, ensures noise power is not counted into energy pulses when no current is present.

• Dual independent Sigma-Delta ADCs — one current channel, one voltage channel
• RMS current range (10mA ~ 35A) @ 1mohm
• Active energy (1W ~ 7700W) @ 1mohm @ 220V
• Outputs RMS current & voltage, fast RMS current, active power, and current/voltage waveform phase angle
• Batch factory gain error < 1%; calibration-free when peripheral components meet specified conditions
• Current channel leakage/overcurrent monitoring with configurable threshold and response time
• Voltage zero-crossing signal output
• Built-in waveform register for waveform data output to support load type analysis
• Integrated temperature sensor for on-chip over-temperature monitoring, high-current node preset temperature alarming, and ambient temperature measurement
• Integrated SPI (max rate 900KHz) / UART (4800bps) communication
• Power loss detection — chip enters reset state when supply drops below 2.7V
• Built-in 1.218V voltage reference
• Built-in oscillator circuit, clock ~4MHz
• Single supply voltage 3.3V, low power consumption 10mW (typical)
• TSSOP14 package

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