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AFE Description

In the energy metering filed, AFE (Analog Front End) chips are the digital analog mixed integrated circuits, including DAC, bandgap voltage reference, power management module, clock control module, metering calculation, and energy-pulse conversion and output functions, etc.


poly-phase AFE, 10000:1 dynamic range, 10 ppm/°C reference

support IEC 62053-21:2003, IEC 62053-22:2003 and IEC 62053-23:2003

single 3.3V supply, wide range: 2.5V~3.6V

7 independent oversampling Σ/ΔADC

<0.1% error in active energy over a dynamic range of 10000:1

<0.1% error in reactive energy over a dynamic range of 5000:1

metering parameters: Irms, Vrms, active/reactive/apparent power, active/reactive/apparent energy, line frequency, phase, and power factor of every phase and on the overall system

internal reference: 1.185V (drift 10ppm/°C)

compensate for temperature shift in external components

current input: CT or di/dt current sensor

SPI interfaces, in slave mode, for communication with the MCU

SPI interfaces, in master mode, working as DMA channels

crystal frequency: 13.1072MHz

programmable power consumption

operating temperature: -40~+85°C

44 – LQFP


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