MCP3909 DataSheet

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  Energy Metering IC with SPI Interface and Active Power Pulse Output


The MCP3909 is an energy measurement IC supporting the IEC 62053 international energy metering specification. The output of the device includes a frequency proportional to the average active (real) power at the inputs as well as a simultaneous serial SPI interface to access the ADC channels and multiplier output data. The MCP3909 incorporates two 16-bit delta-sigma ADCs with a progammable gain up to 16, which enable small shunt meter designs for measuring a wide range of Ib and Imax currents. The output waveform data is available at up to 14 kHz with 16-bit ADC output and 20-bit multiplier output data. The integrated on-chip voltage reference has an ultra-low temperature drift of 15 ppm per degree C.

Parameter Name  Value
Measurement Error  0.1
Dynamic Range  1000:1
Voltage Reference Drift ppm typ  15
PSRR % typ  0.01
Temp. Range (°C)  -40 to 85
Supply Voltage Range (V)  4.5 to 5.5

     Features
Supplies active (real) power measurement for single-phase, residential energy metering
Supports IEC 62053 International Energy Metering Specification and legacy IEC 1036/61036/687 Specifications
Two multi-bit, DAC, second-order, 16-bit, Delta-Sigma Analog-to-Digital Converters (ADCs)
Ultra-low drift on-chip reference: 15 ppm/°C (typ.)
Low IDD of 4 mA (typ.)
Active power pulse output
SPI™ interface for access to raw ADC and multiplier data


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