BL BL0942

BL0942 is a clock-calibration-free energy metering IC with a built-in oscillator, designed for single-phase multi-function energy meters, smart sockets, smart home appliances, and similar applications, offering high cost-effectiveness. BL0942 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 and RMS current/voltage values. BL0942 is capable of measuring RMS current, RMS voltage, active power, active energy, and other parameters. It supports fast RMS current output (for over-current protection), waveform output, and data output via UART/SPI interface, fully meeting the requirements of smart sockets, smart home appliances, single-phase multi-function energy meters, and large-scale power consumption data acquisition applications. BL0942 features a patented anti-creep design that, combined with appropriate external hardware design, ensures noise power is not counted into energy pulses in the absence of current.

• Dual independent Sigma-Delta ADCs: one current channel and one voltage channel
• RMS current range: 10mA ~ 30A @ 1mohm
• Active energy range: 1W ~ 6600W @ 1mohm @ 220V
• Outputs: RMS current, RMS voltage, fast RMS current, and active power
• Batch production gain error < 1%; calibration-free when peripheral components meet specified conditions
• Current channel overcurrent monitoring with configurable threshold and response time
• Voltage/current zero-crossing signal output
• Built-in waveform register for waveform data output, supporting load type analysis
• SPI (up to 900KHz) / UART (4800–38400bps) communication; TSSOP14L package supports up to 4-chip cascaded UART communication
• Power-loss detection: chip enters reset state when supply voltage falls below 2.7V
• Built-in 1.218V voltage reference
• Built-in oscillator circuit, clock frequency ~4MHz
• Single supply voltage 3.3V, low power consumption 10mW (typical)
• SSOP10L / TSSOP14L package

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