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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.


V9901 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: 100-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

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

Programmable energy metering modes

Calibrating meters via software

CF pulse output and interrupt with configurable pulse width 

Zero-crossing interrupt 

Speeding 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

Two additional comparator 

Integrated oscillator, only one external 32768-Hz crystal is 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

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

8-KB extended SRAM memory 

Up to five UART serial interfaces, one supporting IR communication 

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

Up to 70 programmable GPIOs, with port interrupt

Up to 16 fast IOs

Up to 12 hardware timers

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

Independent Watch-Dog Timer (WDT) 


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