50 MHz, Mainstream Precision Metrology Microcontrollers based on Arm® Cortex®-M0+

Block Diagram


KM1x MCUs Block Diagram



  • High-performance Arm® Cortex®-M0 core, up to 50 MHz of core clock frequency
  • 128 KB/64 KB single array flash
  • Supports v6-M Instruction Set Architecture (ISA) including all 16-bit v7-M instructions plus a number of 32-bit thumb-2 instructions
  • PLL to generate clocks for AFE
    • Input range: 31.25 kHz to 39.0625 kHz
    • Output range: 11.72 MHz to 14.65 MHz
  • FLL to generate core, system and flash clocks
    • Input range: 31.25 kHz to 39.0625 kHz
    • Output range: 20 MHz to 50 MHz
  • Flexible modes of operation
  • Two internal trim-able clock references
    • 32 kHz
    • 4 MHz

Analog Front End

  • 24-bit sigma delta ADC with 94 dB SNR
  • Programmable gain amplifier with gains from 1 to 32 with low temperature drift
  • High precision internal voltage reference with low temperature drift


  • Tamper detection with time stamping
  • Random number generator, memory protection unit


  • High accuracy RTC +5 ppm over temperature range
  • 4x UART, 2x SPI, 2x IIC

Operating Voltage and Temperature Range

  • Voltage range 1.71 volts - 3.6 volts (without AFE)
  • Voltage range 2.7 volts - 3.6 volts (with AFE)
  • Temperature range -40°C to 85°C

Part numbers include: MKM14Z128ACHH5, MKM14Z128CHH5, MKM14Z64ACHH5, MKM14Z64CHH5.


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Design Files

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  • Symbols and Footprints

    Kinetis® Symbols, Footprints and Models


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4 software files

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

Engineering Services

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