BL0940 Application Note
●The BL0940is a high accuracy electrical energy measurement IC intended for single-phase application. It measures line voltage and current and calculates active energy and instantaneous rms voltage and current. The devices are suitable for multifunction smart electricity meters, power distribution units for corporate data centers, the Internet of Things, and in-home energy monitors for consumers.
●The document describes system application issued when using the BL0940 to design single-phase energy meters. Generally, a single-phase smart meter consists of a single-phase energy metering IC, an MCU processor and its peripheral components. MCU reads and writes data of metering IC through the SPI/Uart interface. When using shunt sampling neutral current, MCU can be isolated from the metering IC by optocoupler. If the end user does not touch the internal components of the energy meter, ground of the MCU can also be connected to the neutral line and MCU connects to the metering IC directly
■BL0940 Features:
●Two independent Sigma-Delta ADCs
●The Range of Current is （10mA~35A）@1mohm
●Measure RMS Voltage and Current, Fast RMS Current, Active Power, Active Energy
●The Gain error is less than 1%
●Voltage Zero-Crossing Logic Output
●Provide a Uart/SPI Communication Interface
●On-chip Power Supply Monitor
●On-chip voltage reference of 1.218V
●On-chip oscillator circuit, clock frequency 4MHz
●Power Supply 3.3V, Low Power Consumption 10mW (Typical)
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Application note & Design Guide |
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Please see the document for details |
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TSSOP14 |
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English Chinese Chinese and English Japanese |
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2020/2/10 |
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V1.04 |
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660 KB |
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