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.
V9821 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
Full operation: 5.5
mA
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
High 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
CF pulse output and
interrupt with configurable
pulse width
Programmable
threshold for no-load detection
Digital phase
compensation
·MCU and
peripherals:
8052 MCU core, up
to 26 MHz/6.5 MIPS
64-KB Flash, 4-KB
RAM
Crystal
anti-failure supported
Integrated
Real-Time Clock (RTC) and
temperature sensor
Up to 3 UART serial
interfaces, one supporting
IR communication
1 GPSI
(General-Purpose Serial Interface),
I2C compliant
Up
to 32 programmable GPIOs, 12 timers
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
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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