TWR-K20D72M User’s Manual
Page 10 of 17
controllable LEDs, and a potentiometer connected to an ADC
input signal. Refer to Table 5 “I/O
Connectors and Pin Usage Table” for information about which port pins is connected to these features.
2.10
General Purpose Tower Plug-in (TWRPI) Socket
The TWR-K20D72M features a socket that can accept a variety of different Tower Plug-in modules
featuring sensors, RF transceivers, and more. The General Purpose TWRPI socket provides access to
I2C, SPI, IRQs, GPIOs, timers, analog conversion signals, TWRPI ID signals, reset, and voltage supplies.
The pinout for the TWRPI Socket is defined in Table 2.
Table 2.
TWRPI Socket Pin Description
Left-side 2x10 Connector
Right-side 2x10 Connector
Pin Description
1
5V VCC
2
3.3 V VCC
3
GND
4
3.3V VDDA
5
VSS (Analog GND)
6
VSS (Analog GND)
7
VSS (Analog GND)
8
ADC: Analog 0
9
ADC: Analog 1
10 VSS (Analog GND)
11 VSS (Analog GND)
12 ADC: Analog 2
13 VSS (Analog GND)
14 VSS (Analog GND)
15 GND
16 GND
17 ADC: TWRPI ID 0
18 ADC: TWRPI ID 1
19 GND
20 Reset
Pin Description
1
GND
2
GND
3
I2C: SCL
4
I2C: SDA
5
GND
6
GND
7
GND
8
GND
9
SPI: MISO
10 SPI: MOSI
11 SPI: SS
12 SPI: CLK
13 GND
14 GND
15 GPIO: GPIO0/IRQ
16 GPIO: GPIO1/IRQ
17 GPIO: GPIO2/UART0_RX
18 GPIO: GPIO3/ UART0_TX
19 GPIO: GPIO4/ UART0_CTS
20 GPIO: GPIO5/ UART0_RTS
2.11
Touch Interface
The touch sensing input (TSI) module of the Kinetis MCUs provides capacitive touch sensing detection
with high sensitivity and enhanced robustness. Each TSI pin implements the capacitive measurement
of an electrode.
The TWR-K20D72M provides two methods for evaluating the TSI module. There are two individual
electrodes on-board the TWR-K20D72M that simulates pushbuttons. Additionally, twelve TSI signals
