50–75 MHz Precision Metrology MCUs with Segment LCDs based on Arm® Cortex®-M0+

KM3x

The KM3x MCU family enables single-chip one-, two-, and three-phase electricity meters, as well as flow meters and other precision measurement applications. This family of MCUs:

  • Provides security with active and passive tamper detection with time stamping
  • Supports high-precision internal voltage reference with low temperature drift
  • Features a comprehensive enablement suite including reference designs

Block Diagram

KM3x MCU Family

KM3x MCU Family Block Diagram
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Features

MCU

  • High-performance Arm® Cortex®-M0 core, up to 75 MHz of core clock frequency
  • 512 KB/256 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

Security

  • Tamper detection with time stamping
  • Random number generator, memory protection unit
  • Memory Mapped Cryptographic Acceleration Unit (MMCAU) for AES Encryption
  • Cyclic Redundancy Check (CRC)

Interfaces

  • 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 105°C

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