Microchip MCP3909和PIC18F85J90单相电表参考设计

Microchip 公司的MCP3909是支持IEC 62053国际电表标准的电表IC,具有16位双ADC输出数据格式,20位乘法器输出数据格式,两通路的SINAD为81dB,1000:1动态范文的有用功率测量误差0.1%,片内基准电压超低漂移15 ppm/℃.本文介绍MCP3909主要特性,功能方框图以及采用MC3909和PIC18F85J90的单相电表参考设计电路图和材料清单.

MCP3909 and PIC18F85J90 Single Phase Energy Meter Reference Design

Energy Metering IC with SPI Interface and Active Power Pulse Output

The MCP3909 device is an energy-metering IC designed to support the IEC 62053 international metering standard specification. It supplies a frequency output proportional to the average active real power, with simultaneous serial access to ADC channels and multiplier output data. This output waveform data is available at up to 14 kHz with 16-bit ADC output and 20-bit multiplier output words. The 16-bit, delta-sigma ADCs allow for a wide range of IB and IMAX currents and/or small shunt (<200 μOhms) meter designs.A no-load threshold block prevents any current creep measurements for the active power pulse outputs. The integrated on-chip voltage reference has an ultra-low temperature drift of 15 ppm per degree C.

This accurate energy metering IC with high field reliability is available in the industry standard 24-lead SSOP pinout...

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