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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.


Single-Phase Energy Metering 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: 1.9 mA
· Three independent oversampling Σ/Δ 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 or 3.2768 MHz
· Highly metering accuracy:
< 0.1% error in total/fundamental active energy over a dynamic range of 5000:1
< 0.1% error in total/fundamental reactive energy over a dynamic range of 3000:1
Supporting GB/T 17215.321-2008, GB/T 17215.322-2008, and GB/T 17215.323-2008

· Supporting various measurements

· 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: -55°C ~ +150°C
· Package: 16–SOP


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