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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.


Smart Plug Single-Phase Energy Metering AFE

5.0 V power supply, wide range:  3.0 V ~ 6.0 V 

Internal reference: 1.188 V (Typical drift  10 ppm/°C) 

Typical power consumption in normal operation: 1.5 mA

Three independent oversampling /∆ ADCs: One for voltage, and two for currents

Support UART communication interface, baud rate: 1200 bps and 2400 bps

Highly metering accuracy: 

< 0.1% error in total/fundamental active energy over a dynamic range of 2000:1 

< 0.1% error in total/fundamental reactive energy over a dynamic range of 1000:1 

Supporting GB/T 17215.321-2008/IEC 62053-21:2003, GB/T 17215.322-2008/IEC 62053-22:2003 and GB/T 17215.323-2008/IEC 62053-23:2003

Supporting various measurements

DC components of voltage and current signals

Total/Fundamental raw/instantaneous/average current and voltage RMS 

Total/Fundamental raw/instantaneous/average active and reactive power 

Line frequency 

Current input: Current transformer and shunt resistor  

Operating temperature: -40°C ~ +85°C 

Storage temperature: -40°C ~ +125°C

Package: 10-MSOP


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