3 Phase Power meter

Document created by Lauren Percy Employee on Oct 26, 2015Last modified by edk on Jun 13, 2017
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3-phase eMeter Measures power consumption of dedicated demo area and visualized on tablet.


The MKM34Z256 three-phase electronic power meter is based on the MKM34Z256VLL7 MCU. This MCU is a part of the NXP Kinetis-M series of MCUs. The Kinetis-M series MCUs address accuracy needs by providing a high-performance analogue frontend (24-bit AFE), combined with embedded Programmable Gain Amplifier (PGA). Along with high-performance analogue peripherals, these new devices integrate memories, input / output ports, digital blocks, and a variety of communication options. The ARM® Cortex®-M0+ core and Memory-Mapped Arithmetic Unit (MMAU), with support for 64-bit math, enable fast execution of metering algorithms.

The one-phase power meter reference design is intended for the measurement and registration of active and reactive energies in one-phase two-wire networks. It is pre-certified according to the European EN50470-1, EN50470-3, classes B and C, and also to the IEC 62053-21 and IEC 62052-11 international standards for electronic meters of active energy classes 2 and 1.


Value Propositions

Based on MKM34Z256VLL7 MCU

5 to 100A current range (nominal current is 5A; peak current is 105A). 85 to 264V, 50/60 Hz voltage 

Four quadrant measurement Active and Reactive energy accuracy IEC50470-3 Class C, 0.5%

Line frequency measurement (for precision zero-cross detection)

Current transformers sensing circuit implementation

Cost-effective bill of materials (BOM)

Low-power modes effectively implemented, including the use of the built-in RTC

4x44 segments LCD, including charge pump (values shown on LCD: V,A,W,Var,VA, kWh, kVarh, Hz)

Magnetic field tamper detection via ELECTRONIC TAMPER MAG3110 sensor and tamper buttons

Built-in user push-button, LEDs pulse outputs (kWh, kVARh)

IEC1107 infrared hardware interface or Optically isolated RS232 interface

Supports Arduino shield (Wi-Fi, BLE) or FRDM (PLC) expansion boards



  • Bluetooth Low Energy



Kinetis KM256 MCUMicrocontroller