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SoC Description

System on Chip, abbreviated as SoC’, indicates that the system is on the chip. All key modules are integrated on a chip, including MCU, analog IP, digital IP, and memory (or EMIF). It is usually customized or the standard product for certain usage. In the energy metering field, SoC usually integrates MCU, metering module, real-time clock module, Flash and RAM memory, LCD driver module, UART/SPI/I2C communication module, and GPIO module.


V9881E is a single-phase energy metering SoC chip, featuring very low power consumption and high performance. It integrates an Analog Front End (AFE), energy metering architecture, enhanced 8052 MCU core, RTC, WDT, Flash memory, and RAM. It can be used for the single-phase multi-functional energy metering applications.

3.3-V or 5-V power supply: 2.5 V to 5.5 V

Reference voltage: 1.185 V (Typical drift 10ppm/°C), interrupt triggered by external capacitor leakage

Typical current load in full operation mode: 5.5 mA

Typical current load in sleeping mode: 12 μA 

Supporting anti-tampering energy metering application

Package: 24-pin SSOP

Operating temperature: -40 °C ~ +85 °C

Storage temperature: -40 °C ~ +125 °C

Energy metering features: 

4 independent oversampling Σ/Δ ADCs

One voltage channel 

Two current channel

One multifunctional channel for various signal measurements

High metering accuracy: 

Less than 0.1% error on active energy metering over dynamic range of 5000:1

Less than 0.1% error on reactive energy metering over dynamic range of 3000:1

Less than 0.5% error on current/voltage RMS calculation over dynamic range of 1000:1

Various measurements: 

Raw waveform and DC component of current and voltage signals

Instantaneous/average active/reactive power, and positive/negative active/reactive energy

Average apparent power

Instantaneous and average current and voltage RMS

Line frequency

Temperature measurement with accuracy of ± 1°C 

Battery voltage, system voltage, and external voltage signals

Programmable energy metering modes:

Accumulating power, current RMS, or a constant for energy metering 

Accumulating energy at a configurable frequency 

Calibrating meters via software: 

Phase compensation over a range 2 of ± 1.4° (Min.), resolution of 0.0055°/lsb (Min.) 

Gain calibration of RMS and power, and offset calibration of power 

Accelerating meter calibration when low current is applied

CF pulse output and interrupt with configurable pulse width 

Zero-crossing interrupt 

Accelerated current detection to lower power consumption 

Programmable threshold for no-load detection

MCU and peripherals: 

High performance 8-bit 8052 MCU core, with programmable operation frequency, up to  26 MHz/6.5 MIPS

One additional comparator 

Integrated oscillator, only an external 32768-Hz crystal needed to generate crystal frequency 

Crystal supervised: Internal RC oscillator as a replacement when crystal oscillator stops running 

Integrated RTC and temperature sensor, digital crystal frequency compensation for calibration over temperature variation 

64-KB Flash memory, ISP and IAP supported, with write protection and encryption function 

4-KB extended SRAM memory 

Up to 2 UART serial interfaces, one supporting IR communication 

Up to 9 programmable GPIOs 

Up to 12 timers

Various sleep/wakeup methods, configurable wakeup with reset 

Independent watch-dog timer (WDT) 

Debugging via JTAG interfaces in real-time


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