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PL8331   1P Metering SoC w Ultra-low power (4x25 LCD, 1 UART)


The PL8331 is an ultralow power mixed-signal processors consist of several devices featuring different sets of peripherals targeted for energy meter applications. It integrates analog front end and fixed function DSP solution with an enhanced 8052 MCU core, RTC and LCD driver in a single part. The measurement core includes active, reactive, apparent energy calculations, voltage, current RMS, and frequency measurements. This information can be used for energy billing and for any necessary application. Also included are a built-in 16-bit timer, LCD segment drive capability and hardware multiplier.

The PL8331 integrates three PGAs with gain settings from 1x to 32x. Three 24-bit sigma-deltas A/D converters guarantee precision in captured data and enough needed resolution.

The microprocessor functionality includes a single-cycle 8052 core, a real-time clock, 2UARTs, and an SPI, I2C and JTAG interface. It reduces the program memory size requirement and makes it easy to integrate complicated designs.

The programming is very easy and supports multiple ways. (SPI or JTAG)

No external voltage is needed for programming.



  • Wide supply voltage range: 2.4V to 5V
  • Ultralow power consumption
  • Normal mode:
  • Total: 2.2mA @ 3V
  • Sleep Mode: 3uA
  • RTC only: 1.1uA
  • Multi mode power saving function
  • Internal switch between regulated and battery inputs
  • Compatible with CTs, resistive shunts and Rogowski Coil sensors
  • Digital temperature compensation
  • Wake-up from standby mode in less than 5us
  • Reference: 1.2V (20ppm/℃)
  • Operation temperature range: -40℃ to +85℃
  • 64-LQFP(7x7) package


  • Three second-order, 24-bit, delta-sigma Analog-to-Digital Converters
  • Three differential input PGA front ADC (Gain=1,2,4,8,16,24,32)
  • 10 bit SAR ADC with temperature sensor


  • Up to 4x25 segment


  • 8052-based core
  • Single-cycle 8MIPS (Peak)
  • 32.768 kHz external crystal with built in PLL
  • Accurate RTC for time-of-use functions
  • H/W watchdog timer (WDT)
  • External interrupt sources
  • SPI / I2C interface for EEPROM
  • IrDa/UART/IR I/F for AMR
  • Flash security
  • 16-Bit timer
  • Wake-up from I/O, temperature change, or UART
  • 64kB flash memory, 2k bytes RAM
  • Supply voltage supervisor/monitor with built in SAR ADC
  • Serial on board programming/debugging


  • Exceeds IEC62053 / ANSI C12.20 standards
  • Digital signal processing (DSP) provide high accuracy active (Watt), reactive (VAR), and apparent energy (VA) measurement
  • < 0.1% Error on active energy over a Dynamic Range of 2000 to 1 @25℃
  • Line voltage and frequency measurements
  • Phase compensation
  • High frequency outputs proportional to active, reactive, apparent power (AP) or to Irm
  • High frequency outputs proportional to active, reactive, apparent power (AP) or to Irm


  • Single phase Smart meter
  • Smart plug/strip
  • Panel meter
  • Energy /power measurement devices


  • LQFP 64 [7X7]
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