Three-Phase Power Meter Reference Design


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Block Diagram

Three Phase Meter

Three Phase Power Meter Block Diagram

Supported Devices

Wireless Connectivity

Multiprotocol MCUs



Processors and Microcontrollers

KM Series Arm Cortex-M0+



  • Internal connector supporting Arduino® shield (Wi-Fi, Bluetooth) expansion boards


  • 4 x 40 segment LCD, including charge pump (values shown on LCD: V, A, W, Var, VA, kWh, kVarh, cos F, Hz, time, date
  • Isolated (4 kV) RS-232 port for monitoring, parameterization and firmware upgrade
  • Integrated wireless 15W transmitter supports fast charging for Samsung® and Apple® devices
  • Digital control buck-boost converter
  • One control IC controls buck-boost converter, charge, Qualcomm algorithm, PD communication and wireless power management

Design Features

  • Low-power design with operation in low-power modes and the use of built-in RTC (Li-battery backup)
  • 100 A current range, 85 to 264 V, 50/60 Hz voltage range


  • EMC proven design (EN61000-4-2, EN610004-4)


  • Accuracy class: C (active energy EN50470-3) and three or two percent (reactive energy EN62053-23)

Communications Infrastructure

Buy Options


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  • FRDM-KW41Z

  • Part Description: Freedom Development Boards for Kinetis KW21Z, KW31Z and KW41Z MCUs. 2 boards per order..

  • $166.75 USD
  • For a quantity of 1
    • Availability: In stock
    • Inventory: 2
    • Shipping: Normally ships 1-2 business days
Buy from NXPBuy From Distributor

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  • TWR-KM34Z75M

  • Tower System Development Board for Kinetis KM14, KM33 and KM34 (50 MHz) MCUs.

  • $301.18 USD
  • For a quantity of 1
Buy From Distributor


Quick reference to our documentation types.

1 documents

Design Resources

Design Files

3 design files


1 software file

Note: For better experience, software downloads are recommended on desktop.


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