Single-Phase Metering

SINGLE-PHASE-METER

With the growing consumption of energy worldwide, particularly in the residential market, utility providers need increasingly accurate, and cost-effective energy metering solutions. The KM3x_256 series single-phase electricity meter reference design addresses these accuracy and cost needs by providing a high-performance analog front end combined with an embedded programmable gain amplifier.

Kinetis® M Series MCUs - Fact Sheet

Kinetis KM3x MCU Single-Phase Metering Reference Design - Fact Sheet

Block Diagram

Single Phase Meter

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Supported Devices

Wireless Connectivity

Thread

  • KW2xD: Kinetis® KW2xD-2.4 GHz 802.15.4 Wireless Radio Microcontroller (MCU) based on Arm® Cortex®-M4 Core

Sensors

Accelerometers

  • MMA8491Q: ±8g, Low g, Digital NXP® Accelerometer

Processors and Microcontrollers

KM Series Arm Cortex-M0+

  • KM3x: 50–75 MHz Precision Metrology MCUs with Segment LCDs Based on Arm® Cortex®-M0+

Features

MCU

  • MKM34Z256 MCU built on the Arm Cortex-M0+ core with MMAU support

POWER

  • 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)

PERIPHERALS

  • 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

SENSOR

  • Low-power, 3-axis Xtrinsic tilt sensor for electronic tamper detection (optional)

OTHERS

  • 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)

Buy Options

TWR-KM34Z75M-Image

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  • TWR-KM34Z75M

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

  • Kit contains:

    • TWR-KM34Z75M Tower System module
    • Quick Start Guide
    • USB Cable
  • $301.18 USD
  • For a quantity of 1
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Design Resources

Software

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1 software file

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