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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.


V9911 is a single-phase energy metering SoC chip, featuring very low power consumption and high performance. It integrates Analog Front-End (AFE), energy metering architecture, enhanced 8052 MCU core, RTC, WDT, Flash memory, SRAM, and LCD driver. It can be used for the single-phase multi-functional energy meter applications.

Optional power supply 3.3 V or 5 V, wide input range: 2.5 V to 5.5 V

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

Low power operation with power-saving  modes

Supporting anti-tampering energy metering application

Package: 64-pin LQFP

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

Storage temperature: -40 °C ~ +125 °C  Energy metering features: 

Four independent oversampling Σ/Δ ADCs

One voltage channel 

Two current channels, supporting shunt or CT for current sensing

One multifunctional channel for various signal measurements

High metering accuracy: 

Exceeding requirements of IEC 62053-21:2003, IEC 62053-22:2003, and IEC 62053-23:2003

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

Cache of current and voltage signals waveform

Instantaneous/Average and active/reactive power

Positive/Negative and active/reactive energy

Average apparent power

Instantaneous/Average current and voltage RMS

Line frequency

Temperature with measurement accuracy of ± 1°C

Battery voltage and external voltage signals

Two current inputs for active energy metering, or one current input for active and reactive energy metering

Calibrating meters via software: 

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 one external 32768-Hz crystal is needed to generate crystal frequency

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

8-KB extended SRAM memory 

Up to four UART serial interfaces, one supporting IR communication 

One GPSI (General-Purpose Serial Interface), I2C compliant 

Up to 44 programmable GPIOs, with port interrupt

Up to 4 fast IOs

Up to 12 hardware timers 

Supporting PWM output

Various sleep/wakeup methods, configurable wakeup with/without reset 

Independent Watch-Dog Timer (WDT) 

Debugging via JTAG interfaces in real-time  


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