Functional Overview:

The BL0942 is a built-in clock, calibration-free electric energy metering chip, suitable for single-phase multi-function electricity meters, smart sockets, smart home appliances, and other applications, offering high cost-effectiveness. The BL0942 integrates 2 high-precision Sigma-Delta ADCs, a reference voltage, power management analog circuit modules, as well as digital signal processing circuits for handling electrical parameters such as active power, current, and voltage RMS. The BL0942 can measure parameters including current, voltage RMS, active power, active energy, etc., and can output fast current RMS (for overcurrent protection), as well as waveform output functions. Data is output via UART/SPI interfaces, fully meeting the needs of smart sockets, smart home appliances, single-phase multi-function electricity meters, and big data collection of electricity consumption information. The BL0942 features a patented anti-creep design; with appropriate external hardware design, it ensures that noise power is not counted into the energy pulse when there is no current.

Key Features:

⚫ Two independent Sigma-Delta ADCs, one for current and one for voltage.

⚫ Current RMS range (10mA~30A) @1mohm

⚫ Active energy (1W~6600W) @1mohm @220V

⚫ Can output current, voltage RMS, fast current RMS, active power

⚫ Batch factory gain error less than 1%; with proper external components, calibration can be omitted under certain conditions

⚫ Current channel with overcurrent monitoring function, monitoring threshold and response time configurable

⚫ Voltage/current zero-crossing signal output

⚫ Built-in waveform register, can output waveform data for load type analysis

⚫ SPI (max speed 900KHz) / UART (4800-38400bps) communication modes (TSSOP14L package supports up to 4-chip cascaded UART communication)

⚫ Power supply brown-out detection, chip enters reset state when below 2.7V

⚫ Built-in 1.218V reference voltage source

⚫ Built-in oscillator circuit, clock approximately 4MHz

⚫ Single chip operating voltage 3.3V, low power consumption 10mW (typical)

⚫ SSOP10L/TSSOP14L package