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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.


V9821S is a single-phase energy metering SoC chip, featuring very low-power consumption and high performance. It integrates the analog front end, energy metering architecture, enhanced 8052 MCU core,RTC (Real-time Clock), WDT (Watchdog Timer), Flash memory, RAM, and LCD driver. It can be used for the single-phase multi-functional energy meter applications.

·Wide supply voltage range: 3.3 V to 5 V
·Reference voltage: 1.185 V (Typical drift 10 ppm/°C)
·Low power operation with power-saving modes
Ÿ Full operation: 5.5 mA
Ÿ Sleep mode: 10 μA
·48-TQFP package
·Operating temperature range: -40 ~ +85°C
·Energy metering features:
4 independent oversampling Σ/Δ ADCs:
One voltage channel, two current channels, and one multifunctional channel for various signal measurements
ŸHigh metering accuracy:
Exceeds IEC 62053/ANSIC12.20 Standards
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

Line frequency, temperature, and battery voltage measurements

ŸCF pulse output and interrupt with configurable pulse width
ŸProgrammable threshold for no-load detection
ŸDigital phase compensation
·MCU and peripherals:
Ÿ 8052 MCU core, up to 26 MHz/6.5 MIPS
Ÿ 64-KB Flash, 4-KB RAM
Ÿ Crystal anti-failure supported
Ÿ Integrated Real-Time Clock (RTC) and temperature sensor
Ÿ Up to 3 UART serial interfaces, one supporting IR communication
Ÿ 1 GPSI (General-Purpose Serial Interface), I2C compliant

Ÿ Up to 32 programmable GPIOs, 12 timers
Ÿ LCD driver:
Up to 4× 17/6× 15/8× 13 segments
 1/3 bias or 1/4 bias ratio

 Configurable frame frequency
Configurable drive voltage over a range of 2.7 V ~ 3.3 V, resolution of 100 mV/lsb
Ÿ Wake-up from I/O, Rx, RTC, and CF pulse
Ÿ Independent Watch-Dog Timer (WDT)
Ÿ Debugging via JTAG interfaces in real-time


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