Kinetis® K51-100 MHz, Segment LCD, USB Microcontrollers (MCUs) based on Arm® Cortex®-M4 Core

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Block Diagram

Kinetis K5x MCU Family Block Diagram

Kinetis K5x MCU Family Block Diagram



  • 10 low-power modes with power and clock gating for optimal peripheral activity and recovery times. Stop currents down to 2 µA, and run currents of <350 µA/MHz, with 4 µs wake-up from stop mode
  • Full memory and analog operation down to 1.71 volts for extended battery life
  • Low-leakage wake-up unit with up to eight internal modules and 16 pins as wake-up sources in low-leakage stop (LLS)/very low-leakage stop (VLLS) modes
  • Low-power timer for continual system operation in reduced power state

Flash, SRAM and FlexMemory

  • 256 KB - 512 KB flash. Fast access, high reliability with four-level security protection
  • 64 KB - 128 KB of SRAM
  • FlexMemory: 32 bytes - 4 KB of user segmentable byte write/erase EEPROM for data tables/system data. EEPROM with over 10 M cycles and flash with 70 µsec write time (brownouts without data loss/corruption). No user or system intervention to complete programming and erase functions and full operation down to 1.71 volts. In addition, upto 256 KB can be used for extra program code, data or EEPROM backup
  • Up to two programmable gain amplifiers with x64 gain for small amplitude signal conversion

Mixed-Signal Capability

  • Two operational amplifiers allow signal filtering and amplification
  • Two transimpedance amplifiers optimized for converting current inputs into voltages that can be read by the ADC
  • Two high-speed 16-bit ADCs with configurable resolution. Single or differential output mode operation for improved noise rejection. 500 ns conversion time achievable with programmable delay block triggering
  • Two 12-bit DACs for analog waveform generation for audio applications
  • Three high-speed comparators providing fast and accurate motor over-current protection by driving PWMs to a safe state
  • Analog voltage reference provides an accurate reference to analog blocks, ADC and DAC, and replaces external voltage references to reduce system cost


  • Cortex-M4 core with DSP, 100 MHz clock, single cycle MAC, and single instruction multiple data (SIMD) extensions
  • 16-channel DMA for peripheral and memory servicing with reduced CPU loading and faster system throughput
  • Cross bar switch enables concurrent multi-leader bus accesses, increasing bus bandwidth
  • •Independent flash banks allow concurrent code execution and firmware updating with no performance degradation or complex coding routines

Timing and Control

  • Up to three FlexTimers with a total of 12 channels. Hardware dead-time insertion and quadrature decoding for motor control
  • Carrier modulator timer for infrared waveform generation in remote control applications
  • Four-channel 32-bit periodic interrupt timer provides time base for RTOS task scheduler or trigger source for ADC conversion and programmable delay block

Human-Machine Interface

  • Hardware touch-sensing interface with up to 16 inputs. Operates in all low power modes (minimum current adder when enabled). Hardware implementation avoids software polling method. High sensitivity level allows use of overlay surfaces upto 5 mm thick
  • Flexible, low-power LCD controller with up to 320 segments (40x8 or 44x4). LCD blink mode enables low average power while remaining in low-power mode. Segment fail detect guards against erroneous readouts and reduces LCD test costs. Frontplane/backplane reassignment provides pin-out flexibility easing PCB design and allows LCD configuration changes via firmware with no hardware re-work. Supports multiple 3 V and 5 V LCD panel sizes with fewer segments (pins) than competitive controllers and no external components. Unused LCD pins can be configured as other GPIO functions

Connectivity and Communications

  • USB 2.0 On-The-Go (full speed). Device charge detect optimizes charging current/time for portable USB devices enabling longer battery life. Low-voltage regulator supplies up to 120 mA off chip at 3.3 V to power external components from 5 V input
  • Up to five UARTs with IrDA support including one UART with ISO7816 smart card support. Variety of data size, format and transmission/reception settings supported for multiple industrial communication protocols
  • Inter-IC Sound (I2S) serial interface for audio system interfacing
  • Up to three DSPI and two I2C

Reliability, Safety and Security

  • Hardware Encryption coprocessor for secure data transfer and storage. Faster than software implementations and with minimal CPU loading. Supports a wide variety of algorithms - DES, 3DES, AES, MD5, SHA-1, SHA-256
  • Memory protection unit provides memory protection for all leaders on the cross bar switch, increasing software reliability
  • Cyclic redundancy check engine validates memory contents and communication data, increasing system reliability
  • Independent-clocked COP guards against clock skew or code runaway for fail-safe applications such as the IEC 60730 safety standard for household appliances
  • External watchdog monitor drives output pin to safe state external components if watchdog event occurs
  • This product is included in NXP®.s product longevity program, with assured supply for a minimum of 15 years after launch

External Peripheral Support

  • FlexBus external bus interface provides interface options to memories and peripherals such as graphics displays. Supports up to 6 chip selects and 2GB addressable space
  • Secure digital host controller supports SD, SDIO, MMC or CE-ATA cards for in-application software upgrades, media files or adding Wi-Fi support

Part numbers include: MK51DN256CMD10, MK51DN256ZCMD10, MK51DN512CLL10, MK51DN512CLQ10, MK51DN512CMC10, MK51DN512CMD10, MK51DN512ZCLL10, MK51DN512ZCLQ10, MK51DN512ZCMC10, MK51DX256CLK10, MK51DX256CLL10, MK51DX256CMC10, MK51DX256ZCLL10, MK51DX256ZCMC10, TEXTBOOK-KINETIS.


Quick reference to our documentation types.

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Design Files

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  • Symbols and Footprints

    Kinetis® Symbols, Footprints and Models

  • Calculators

    TFS FlexMem Endurance Calculator


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

Engineering Services

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To find a complete list of our partners that support this product, please see our Partner Marketplace.


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