One Phase Power Meter Reference Design


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Technical and Functional Specifications

  • MKM34Z256 MCU built on the Arm Cortex-M0+ core with MMAU support
  • 5 to 80 A current range
  • 85 to 264 V, 50/60Hz voltage range
  • Low-power modes including the use of built-in RTC (Li-battery backup)
  • 8 x 16 segment LCD, including charge pump (values shown on LCD: V, A, W, VAr, VA, kWh, kVArh, cos φ, Hz, THD, time, date)
  • Isolated (4 kV) RS-232 port for monitoring, parameterization, and firmware upgrade
  • IEC 1107 infrared hardware interface
  • RF connector supporting sub GHz or 2.4 GHz 802.15.4 communications for Arm and remote control (KW0x or KW2x wireless MC
  • LED pulse outputs (kWh, kVArh)
  • Single built-in mechanical button as control interface
  • Low-power, 3-axis Xtrinsic tilt sensor for electronic tamper detection (optional)
  • Four-quadrant energy measurement (import/export)
  • Line frequency measurement (for precision zero-cross detection)
  • EMC proven design (EN61000-4-2, EN610004-4)
  • Cost-effective bill of materials (BOM)
  • Cost-effective shunt-resistor sensing circuit implementation
  • Accuracy class C (for active and reactive energy EN50470-3)


  • TWR-KM34Z75M   Active

  • Tower System Development Board for Kinetis KM14, KM33 and KM34 (50 MHz) MCUs
    • TWR-KM34Z75M
    • 1 @ US
    • $160.00
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