Freescale Semiconductor Kinetis TWR-K21D50M User manual

TWR-K21D50M
Quick Start Guide
Low-Power 32-bit ARM®Cortex®-M4
MCUs with High-Precision Analog,
Connectivity and Security
Tower System
Development Board
Platform

2
Quick Start Guide
Get to Know the TWR-K21D50M Board
Power/OSJTAG
Micro-USB
Regulator
Option
Selector
RESET
K21
Micro-USB
Tamper PinsSecondary
Connector
MK21D MCU USB Switch *
SW2
SW3
Accelerometer
LEDs
Potentiometer
General-
Purpose
TWRPI Plug-In
OSJTAG Bootloader
Selection
JM60 BDM
Primary
Connector
VBAT OptionsJTAG
Figure 1: Front side of TWR-K21D50M module (TWRPI devices not shown).

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TWR-K21D50M
Freescale Tower System
The TWR-K21D50M MCU module is designed to work either in
stand-alone mode or as part of the Freescale Tower System, a
modular development platform that enables rapid prototyping and
tool re-use through reconfigurable hardware. Begin constructing
your Tower System today by visiting freescale.com/Tower for
additional Tower System MCU modules and compatible peripherals.
Battery
Receptacle

4
Quick Start Guide
TWR-K21D50M Features
• MK21DMCU:
MK21DN512AVMC5 or
MK21DN512VMC5 (50 MHz,
512 KB Flash, 64 KB RAM,
USB OTG, tamper detection,
encryption, low power, 121
MAPBGA); part number will
depend on the Tower board
revision
• Dual-roleUSBinterfacewith
Micro-AB USB connector
• On-boardopensourceJTAG
(OSJTAG)circuitwithvirtual
serial port
• General-purposeTowerplug-in
(TWRPI) socket
• Three-axisaccelerometer
(MMA8451Q)
• Fouruser-controlledstatusLEDs
• PushbuttonsforGPIOinterrupts
and MCU reset
• Potentiometer
• Independent,battery-operated
power supply for
real-time clock and tamper
detection modules

5
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Step-by-Step Installation Instructions
In this quick start guide, you will learn how
to set up the TWR-K21D50M module and
run the included demonstrated software.
For more detailed information, review the
user manual at freescale.com/TWR-
K21D50M.
Download Software
and Tools
Download installation
software and documentation
under “Jump Start
Your Design” at
freescale.com/TWR-K21D50M.
1
2Install the
Software and Tools
InstalltheP&EMicroKinetisTowertoolkit.
ThetoolkitincludestheOSJTAGandUSB
to serial drivers.
3Configure the
Hardware
Install the included battery into the VBAT
(RTC) battery holder. Then, connect one
end of the USB cable to the PC and the
otherendtothePower/OSJTAGmicro-B
connector on the TWR-K21D50M module.
Allow the PC to automatically configure the
USB drivers if needed.
4Download the TWR-
K21D50M User Manual
and Demonstration Labs
Download the TWR-K21D50M user manual
and demonstration labs at freescale.com/
TWR-K21D50M.
5Download the Freescale
CodeWarriorIDEand
MQX™ RTOS
DownloadtheFreescaleCodeWarriorIDE
and MQX RTOS by clicking the relevant
links at freescale.com/CodeWarrior and
freescale.com/MQX.

6
Quick Start Guide
TWR-K21D50MJumperOptions
The following is a list of all the jumper options. The default installed jumper settings are
indicated by white text within the gray boxes.
Jumper Option Setting Description
JP1 Tamper
Connections 2-3 JP1-1throughJP1-6areconnectedtotheMCUTamperpins
TAMPER0throughTAMPER5,respectively,foractivetamperdetection
J6
JTAGBoard
Power
Selection
ON ConnectOSJTAG5Voutput(P5V_TRG_USB)toJTAGport(supports
poweringboardfromJTAGpodsupporting5Vsupplyoutput)
OFF DisconnectOSJTAG5Voutput(P5V_TRG_USB)fromJTAGport
J7 VBAT Power
Source
1-2 Connect VBAT to on-board 3.3 V or 1.8 V supply
2-3 ConnectVBATtothehighervoltagebetweenMCUsupply(MCU_
PWR) or coin cell supply (VBATD)
J8 MCU Power
Connection
1-2 Connecton-board3.3Vor1.8Vsupply(V_BRD)toMCUVDD
2-3 Connect K21 USB regulator output to MCU VDD
J9
OSJTAG
Bootloader
Selection
ON OSJTAGbootloadermode(OSJTAGfirmwarereprogramming)
OFF Debugger mode
J10
General
Purpose
TWRPI
V_BRDPower
Enable
ON Connecton-board1.8Vor3.3Vsupply(V_BRD)toTWRPI3-Vpower
(GPT_VBRD)
OFF Disconnectfrom-board1.8Vor3.3Vsupply(V_BRD)toTWRPI3-V
power(GPT_VBRD)
J11 VREGIN
Selector
1-2 OSJTAG5Voutput(P5V_TRG_USB)
connectedtoon-boardregulatorinput(VREG_IN)
5-6 VBUSsignalonmicro-USBconnectorJ19connectstoK21_VREGIN
to allow stand-alone USB operation
6-8 VBUSsignalfromTowerElevatorconnectorconnectstoK21_VREGIN
to allow USB operation with complete Tower System
J12 Potentiometer
Connection
ON ConnectpotentiometertoADC0_SE12
OFF DisconnectpotentiometerfromADC0_SE12
J13
GPIORESET_
OUT_B
Connection
1-2 ConnectPTA14toRESET_OUT_Bsignal
2-3 ConnectPTA17toRESET_OUT_Bsignal
OFF LeaveRESET_OUT_Bsignaldisconnected

7
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TWR-K21D50MJumperOptions(continued)
Jumper Option Setting Description
J15 LED
Connections
1-2 ConnectPTD4togreenLED(D5)
3-4 ConnectPTD5toyellowLED(D6)
5-6 ConnectPTD6toredLED(D8)
7-8 ConnectPTD7toblueLED(D9)
OFF DisconnectPTD[4:7]fromassociatedLED
J17
V_BRDPower
Source
(Board Power
Selector)
1-2 ConnectK21USBregulatoroutput(VOUT_3V3)to
on-boardsupply(V_BRD)
3-5 Connect 3.3 V on-board regulator output (P3V3) to
on-boardsupply(V_BRD)
5-7 Connect 1.8 V on-board regulator output (P1V8) to
on-boardsupply(V_BRD)
J18
Accelerometer
IRQ
Connection
1-2 Connect PTB0 to INT1 pin of accelerometer
3-4 Connect PTB1to INT2 pin of accelerometer
OFF Disconnect PTB0 and/or PTB1 from INT1 and/or INT2 of
accelerometer
J21 USB ID
Connection
ON ConnectPTD7toUSBIDpin
OFF DisconnectPTD7fromUSBIDpin
J22 USB Power
Enable
ON ConnectPTC9toUSBpowerenableonpowerswitchMIC2026
OFF DisconnectPTC9fromUSBpowerenableonpowerswitchMIC2026
J23 USB Over-
Current Flag
ON Connect PTC8 to over-current flag on power switch MIC2026
OFF Disconnect PTC8 from over-current flag on power switch MIC2026
J24 USB Switch * 1-2 USBmicroJ19
2-3 USBminiJ14onTWR-SER
* Some versions of the board may not have this option

Visit freescale.com/TWR-K21D50M,
freescale.com/K20 or freescale.com/Kinetis for
information on the TWR-K21D50M module.
Support
Visit freescale.com/support for a list of phone
numbers within your region.
Warranty
Visit freescale.com/warranty for complete
warranty information.
For more information, visit freescale.com/Tower
Join the online Tower community at towergeeks.org
Freescale, the Freescale logo, CodeWarrior and Kinetis are trademarks of
Freescale semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. All other product
or service names are the property of their respective owners.
© 2015 Freescale Semiconductor, Inc.
DocNumber:K21D50MQSGREV2AgileNumber:926-27405REVC
Get Started
Download installation software and documentation under
“Jump Start Your Design” at freescale.com/TWR-K21D50M.