TWR-K21D50M Freescale Semiconductor, TWR-K21D50M Datasheet - Page 12

• 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

6.9 General Purpose Tower Plug-in (TWRPI) Socket
The TWR-K21D50M features a socket (J3 and J4) that can accept a variety of different Tower Plug-in modules
featuring sensors, RF transceivers, and other peripherals. The General Purpose TWRPI socket provides access to I
SPI, IRQs, GPIOs, timers, analog conversion signals, TWRPI ID signals, reset, and voltage supplies. The pinout for the
TWRPI Socket is defined in Table 3.
6.10 USB
The K21DN512VMB5 features a full-speed/low-speed USB module with OTG/Host/Device capability and built-in
transceiver. The TWR-K21D50M routes the USB D+ and D- signals from the K21DN512VMB5 MCU directly to the on-
board micro-USB connector (J19).
A power supply switch with an enable input signal and over-current flag output signal is used to supply power to the
USB connector when the K21DN512VMB5 is operating in host mode. PTC8 is connected to the flag output signal and
PTC9 is used to drive the enable signal. Both PTC8 and PTC9 port pins can be isolated with jumpers (J23 and J22,
respectively) if needed.
Pin
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
VSS (Analog GND)
VSS (Analog GND)
VSS (Analog GND)
VSS (Analog GND)
VSS (Analog GND)
VSS (Analog GND)
VSS (Analog GND)
ADC: TWRPI ID 0
ADC: TWRPI ID 1
ADC: Analog 0
ADC: Analog 1
ADC: Analog 2
Description
3.3 V VDDA
3.3 V VCC
J4
5 V VCC
Reset
GND
GND
GND
GND
Table 3. General Purpose TWRPI socket pinout
TWR-K21D50M Tower Module User’s Manual
Pin
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
UART: UART_CTS or GPIO: GPIO4/Timer
UART: UART_RTS or GPIO: GPIO5/Timer
UART: UART_RX or GPIO: GPIO2
UART: UART_TX or GPIO: GPIO3
GPIO: GPIO0/IRQ
GPIO: GPIO1/IRQ
Description
J3
SPI: MISO
SPI: MOSI
I2C: SDA
I2C: SCL
SPI: CLK
SPI: SS
GND
GND
GND
GND
GND
GND
GND
GND
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