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The TWR-K21D50M module is a development board for the Kinetis^® K11, K12, K21 and K22 MCUs, which are ideal for optimized, cost-sensitive security applications.

This Tower^® module is designed to enable rapid prototyping and development for applications requiring medium embedded memory densities, security through tamper detect and crypto unit and communication through USB.

The TWR-K21D50M module operates as a standalone debug tool and can also be combined and used as part of the modular Tower System development platform..

Design Files

Software

Product Details

Supported Devices

Processors and Microcontrollers

K1x Mainstream

K11_50: Kinetis^® K11-50 MHz, Anti-Tamper Microcontrollers (MCUs) based on Arm^® Cortex^®-M4 Core
K12_50: Kinetis^® K12-50 MHz, Microcontrollers (MCUs) with Optimized Features based on Arm^® Cortex^®-M4 Core

K2x / KS2x USB

K21_50: Kinetis^® K21-50 MHz, Full-Speed USB, Anti-Tamper Microcontrollers based on Arm^® Cortex^®-M4 Core
K22_50: Kinetis^® K22-50 MHz, Cost Effective, Full-Speed USB Microcontrollers (MCUs) based on Arm^® Cortex^®-M4 Core

Features

Microcontroller

MK21D MCU: MK21DN512AVMC5 or MK21D512VMC5 in a 121 MAPBGA

Connectivity

Standalone USB 2.0 on-the-go (full speed)
Tower connectivity for access to UART, SPI, I^²C

Debug

Integrated, open source JTAG

Sensors

MMA8451Q 3-axis accelerometer

Tamper pin header
Tower^® Plug-In (TWRPI)

Components

Potentiometer
4 LEDs
Pushbuttons
Nd battery holder

MCUXpresso Software and Tools

null

Buy Options

Click to expand

TWR-K21D50M
Active

Tower System Development Board for Kinetis K11, K12, K21 and K22 (50 MHz) MCUs.

Kit Contains

TWR-K21D50M board with a 512KB flash, 121 MAPBGA, 32-bit MCU
Quick Start Guide
2 USB cables (micro, mini)
USB Adapter
Battery

Order from distributors

Distributor	Region	Inventory	Inventory Date	Order

Upon selection of a preferred distributor, you will be directed to their web site to place and service your order. Please be aware that distributors are independent businesses and set their own prices, terms and conditions of sale. NXP makes no representations or warranties, express or implied, about distributors, or the prices, terms and conditions of sale agreed upon by you and any distributor.

Documentation

Quick reference to our documentation types

10 documents

Compact List

MQX Board Support Package (BSP) - Porting Guide on KEIL[AN4626]

PDFOct 31, 2012Rev 0
Using the CAU/mmCAU in ColdFire and Kinetis families[AN4307]

PDFMay 18, 2011Rev 0

Kinetis^® K1x: Baseline Cortex-M4(F) MCUs[KNTSK10FMLYFS]

PDFFeb 14, 2020Rev 4
Kinetis K2x MCU Family - Fact Sheet[KINK2XFS]Featured

PDFFeb 24, 2017Rev 11
Kinetis K1x MCU Family - Fact Sheet[KNTSK1XFMLYFS]Featured

PDFMar 10, 2014Rev 9

TWR-K21D50M - Quick Start Guide[TWRK21D50MQSG]Featured

PDFJan 30, 2015Rev 2

Kinetis^® SDK v.1.1.0 Release Notes for the MK21DA5 and MKW24D5 Devices[KSDK110MK21DA5MKW24D5RN]

PDFFeb 17, 2015Rev 0
MQX™ RTOS Release Notes for Kinetis^® SDK 1.1.0 MK21DA5 and MKW24D5 NXP^® Platforms[MQXKSDK110MK21DA5MKW24D5RN]

PDFFeb 17, 2015Rev 0

Freescale MQX™ Release Notes for TWR-K21D50M (3.8.0)[FSL_MQX_RN_TWRK21D50M]

PDFAug 31, 2012Rev 1

TWR-K21D50M Tower Module User's Guides[TWRK21D50MUM]FeaturedGetting Started

PDFJan 27, 2015Rev 2

Design Resources

Design Files

Quick reference to our design files types.

4 design files

Printed Circuit Boards and Schematics
TWR-K21D50M REV C - Printed Circuit Board bill of materials and design files

ZIPRev C2Jan 28, 2015 00:00:005.07 MBTWR-K21D50M_BOM_SCH

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Printed Circuit Boards and Schematics
TWR-K21D50M Schematic Rev C

PDFRev C2Jan 30, 2015 00:00:00484.61 KBTWRK21D50MSCH
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Printed Circuit Boards and Schematics
TWR-K21D50M Schematic Rev B

PDFRev BJul 12, 2012 00:00:00217.65 KBTWRK21D50MSCH_REVB
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Printed Circuit Boards and Schematics
TWR-K21D50M-REV-B - Printed Circuit Board bill of materials and design files

ZIPRev BSep 6, 2014 00:00:005.07 MBTWR-K21D50M-REV-B

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Software

Quick reference to our software types.

4 software files

Development IDEs and Build Tools
MCUXpresso Integrated Development Environment (IDE)Featured

Download Options
BSPs and Device Drivers
MCUXpresso SDK Builder for the K21 Tower Board

EXTERNALRev 1Feb 9, 2021 04:54:001 KBMCUXPRESSO-SDK-TWR-K21D50M

Download
Code Snippets
TWR-K21D50M Sample Code

EXERev 1.0Aug 14, 2012 00:00:0061.46 MBTWR-K21D50M_SC_LAB

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Additional software available. View our featured partner solutions.
Debugging and Visualization Tools
FreeMASTER tool 3.2 (includes Lite 1.4) – Windows installer

EXERev 3.2.6Nov 4, 2025 11:08:00334772 KBFMASTERSW

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

Kinetis K21 50 MHz MCU Tower System Module

Product Details

Supported Devices

Processors and Microcontrollers

K1x Mainstream

K2x / KS2x USB

Features

Microcontroller

Connectivity

Debug

Sensors

Components

MCUXpresso Software and Tools

Applications

Industrial

Buy Options

TWR-K21D50M Active

Documentation

Filter by

Application Note (2)

MQX Board Support Package (BSP) - Porting Guide on KEIL[AN4626]

Using the CAU/mmCAU in ColdFire and Kinetis families[AN4307]

Fact Sheet (3)

Kinetis® K1x: Baseline Cortex-M4(F) MCUs[KNTSK10FMLYFS]

Kinetis K2x MCU Family - Fact Sheet[KINK2XFS]Featured

Kinetis K1x MCU Family - Fact Sheet[KNTSK1XFMLYFS]Featured

Quick Reference Guide (1)

TWR-K21D50M - Quick Start Guide[TWRK21D50MQSG]Featured

Release Note (2)

Kinetis® SDK v.1.1.0 Release Notes for the MK21DA5 and MKW24D5 Devices[KSDK110MK21DA5MKW24D5RN]

MQX™ RTOS Release Notes for Kinetis® SDK 1.1.0 MK21DA5 and MKW24D5 NXP® Platforms[MQXKSDK110MK21DA5MKW24D5RN]

Supporting Information (1)

Freescale MQX™ Release Notes for TWR-K21D50M (3.8.0)[FSL_MQX_RN_TWRK21D50M]

User Guide (1)

TWR-K21D50M Tower Module User's Guides[TWRK21D50MUM]FeaturedGetting Started

TWR-K21D50M - Quick Start GuideFeatured

TWR-K21D50M Tower Module User's GuidesFeatured

Kinetis K2x MCU Family - Fact SheetFeatured

Kinetis K1x MCU Family - Fact SheetFeatured

Design Resources

Design Files

Filter by

TWR-K21D50M REV C - Printed Circuit Board bill of materials and design files

TWR-K21D50M Schematic Rev C

TWR-K21D50M Schematic Rev B

TWR-K21D50M-REV-B - Printed Circuit Board bill of materials and design files

Filter By

Software

Filter by

MCUXpresso Integrated Development Environment (IDE)Featured

MCUXpresso SDK Builder for the K21 Tower Board

TWR-K21D50M Sample Code

FreeMASTER tool 3.2 (includes Lite 1.4) – Windows installer

Filter By

Support

What do you need help with?

Suggested Links

TWR-K21D50M
Active

Kinetis^® K1x: Baseline Cortex-M4(F) MCUs[KNTSK10FMLYFS]

Kinetis^® SDK v.1.1.0 Release Notes for the MK21DA5 and MKW24D5 Devices[KSDK110MK21DA5MKW24D5RN]

MQX™ RTOS Release Notes for Kinetis^® SDK 1.1.0 MK21DA5 and MKW24D5 NXP^® Platforms[MQXKSDK110MK21DA5MKW24D5RN]