TWR-K21D50M Freescale Semiconductor, TWR-K21D50M Datasheet - Page 13

• Manufacturer Part Number: TWR-K21D50M
• Description: Development Boards & Kits - ARM
• Manufacturer: Freescale Semiconductor

Specifications of TWR-K21D50M

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: MK21DN512VMC5
• Core: ARM Cortex M4
• Interface Type: USB
• Operating Supply Voltage: 1.8 V/3.3 V
• Description/function: TWR-K21D50M MCU module is designed to work either in stand-alone mode or as part of the Freescale Tower System
• For Use With: Freescale Tower Systems

The following is a list of all of the jumper options on the TWR-K21D50M. The default installed jumper settings are
indicated by
7 TWR-K21D50M Jumper Options and Headers
OSJTAG bootloader selection
JTAG board power selection
MCU power connection
(Board Power Selector)
V_BRD power source
VBAT power source
USB ID connection
VREG IN Selector
white text on a black
Option
TWR-K21D50M Tower Module User’s Manual
background.
Table 4. TWR-K21D50M Jumper Options
Jumper
J17
J11
J21
J8
J7
J6
J9
Setting
OFF
OFF
OFF
1-2
2-3
1-2
2-3
ON
ON
1-2
3-5
5-7
1-2
5-6
6-8
ON
Connect OSJTAG 5V output (P5V_TRG_USB)
to JTAG port (supports powering board from
JTAG pod supporting 5V supply output)
(VREG_IN)
Connect on-board 3.3 V or 1.8 V supply
(V_BRD) to MCU VDD
Connect K21 USB regulator output to MCU
VDD
Connect VBAT to on-board 3.3 V or 1.8 V
supply
Connect VBAT to the higher voltage
between MCU supply (MCU_PWR) or
coin cell supply (VBATD)
Disconnect OSJTAG 5V output
(P5V_TRG_USB) from JTAG port
OSJTAG bootloader mode (OSJTAG firmware
reprogramming)
Debugger mode
Connect K21 USB regulator output
(VOUT_3V3) to on-board supply (V_BRD)
Connect 3.3 V on-board regulator output
(P3V3) to on-board supply (V_BRD)
Connect 1.8 V on-board regulator output
(P1V8) to on-board supply (V_BRD)
OSJTAG 5V output (P5V_TRG_USB)
connected to on-board regulator input
VBUS signal on micro-USB connector J19
connects to K21_VREGIN to allow stand-
alone USB operation
VBUS signal from Tower Elevator connector
connects to K21_VREGIN to allow
USB operation with complete Tower System
Connect PTD7 to USB ID pin
Disconnect PTD7 from USB ID pin
Description
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