SoC Description

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