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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.


Low-power single-phase multi-function AFE

5.0 V power supply, wide range: 3.0 V ~ 5.5 V

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

Typical power consumption in normal operation: 2.5 mA

Three independent oversampling /∆

ADCs: One for voltage, one for current, and one for multifunctional measurements

Support UART communication interface, baud rate: 4800 bps

Crystal frequency: 6.5536 MHz

Highly metering accuracy:

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

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

Supporting GB/T 17215.321-2008, GB/T 17215.322-2008, and GB/T 17215.323-2008

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

Positive/Negative energy, selectable active/reactive power

Line frequency and temperature

Supporting software calibration

Supporting current detection

Supporting programmable no-load detection threshold

Accelerating meter calibration when low signal is applied

CF signals output

Current input: Current transformer and shunt resistor

Operating temperature: -40°C ~ +85°C

Storage temperature: -40°C ~ +125°C

Package: 16–SOP


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