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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.

V9871

5.0 V power supply, wide range: 3.0 V to 6.0 V

Support UART communication interface, baud rate: 1200 bps, 2400 bps, 4800 bps, and        9600 bps

Internal reference voltage: 1.185 V (Typical drift 10 ppm/°C)

Low power operation: Less than 3 mA (Typical)

Package: 20-TSSOP

Operating temperature: -40 ~ +85°C

Storage temperature: -40 ~ +125°C

Energy metering features: 

Current input: General CT and shunt resistor

4 independent oversampling Σ/Δ ADCs: 

One voltage channel, two current channels, and one multifunctional channel for various signal measurements

High metering accuracy: 

Less than 0.1% error on active energy metering over dynamic range of 2000:1

Less than 0.1% error on reactive energy metering over dynamic range of 1000:1  Less than 0.5% error on current/voltage RMS calculation over dynamic range of 500:1

Various measurements: 

Raw waveform and DC component of current and voltage signals

Instantaneous/Average active/reactive power and average apparent power 

Instantaneous/Average voltage/current RMS

Positive/Negative active/reactive energy

Line frequency 

Temperature with measurement accuracy of ± 1°C

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

Supporting meter calibration via software: 

Phase compensation over 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

Supporting CF pulse output 

Supporting rapid current detection

Supporting programmable threshold for no-load detection

MCU and peripherals: 

8-bit 8052 MCU core, up to 26 MHz/6.5 MIPS

64-KB Flash with write-protection and encryption functions, supporting ISP and IAP

4-KB external SRAM

Integrated Real-Time Clock (RTC) and temperature sensor 

Up to 2 UART serial interfaces 

Wake-up from I/O, Rx, RTC, and CF pulse

Independent Watch-Dog Timer (WDT)

Debugging via JTAG interfaces in real-time

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