BL0939 is a calibration-free energy metering chip with a built-in clock. It is suitable for applications such as single-phase multi-function energy meters, smart sockets, smart home appliances, and electric bicycle charging piles. BL0939 integrates 3 high- precision Sigma-Delta ADCs , which can measure 2 currents and 1 voltage at the same time.
BL0939 can measure current, voltage RMS, active power, active energy and other parameters, and can output fast current RMS ( for leakage monitoring or overcurrent protection ) , as well as temperature detection, waveform output and other functions, output through UART/SPI interface.
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Three independent Sigma-Delta ADCs for measuring two currents and one voltage.
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RMS current range ( 10mA~35A ) @1mohm
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Active energy ( 1w~7700w ) @1mohm@220V
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Can output current, voltage RMS, fast current RMS, active power, current and voltage waveform phase angle
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batch factory gain error is less than 1% , and the external components can be exempted from calibration if they meet certain conditions
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Both current channels have leakage / overcurrent monitoring function, monitoring threshold and response time can be set
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Voltage zero-crossing signal output
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Built-in waveform register, which can output waveform data for load type analysis
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Integrated temperature sensor to meet the needs of product over-temperature monitoring, high-current node preset temperature alarm, ambient temperature measurement, etc.
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Internal power down monitoring, below 2.7V , the chip enters the reset state.
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Built-in 1.218V reference voltage source
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Built-in oscillation circuit, the clock is about 4MHz
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Chip single working power supply 3.3V , low power consumption 10mW ( typical value )
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SOP16L encapsulation
