AppBox D21 System User’s Guide 19
AppBox
3.1.5.3 EXT3, AppIO Module Connector
The following table shows the signals present on the EXT3 connector.
EXT3, AppIO Module Connector
Pin #
Signal name
Function
Shared Functionality
1
Pin 2, JP3, VDD_5V if shorted
+5 volts to AppIO Module
if
shorted
VDD_5V
2 DGND
Ground
Ground
3
PA02_ADC(P)
A/D converter, alternatively
positive part of differential ADC
4 PA03_ADC(N)
A/D converter, alternatively
negative part of differential ADC
5
PB30_GPIO
General purpose I/O
LED1
6
PA15_GPIO
General purpose I/O, SW1
7
PA12_PWM(P)
PWM, alternatively positive part
of differential PWM
8 PA13_PWM(N)
PWM, alternatively negative part
of differential PWM
9
PA28_IRQ/GPIO
Interrupt request line and/or
GPIO
10
PA27_SPI_SS_B/GPIO
Slave select for SPI and/or GPIO
11
PA08_TWI_SDA
Data line for I
2
C interface, always
implemented, bus type
Pin 11 on EXT1, EXT2, Pin 5, U2
12 PA09_TWI_SCL
Clock line for I
2
C interface,
always implemented, bus type
Pin 12 on EXT1, EXT2, Pi 6, U2
13
PB11_UART_RX
Receiver line of target device
UART
Pin 13 on EXT1, EXT2
14 PB10_UART_TX
Transmitter line of target device
UART
Pin 14 on EXT1, EXT2
15
PA17_SPI_SS_A
Slave select for SPI
16 PB22_SPI_MOSI
Master out slave out line of serial
peripheral interface, always
implemented, bus type
Pin 5, U7
17
PB16_SPI_MISO
Master in slave out line of serial
peripheral interface, always
implemented, bus type
Pin 2, U7
18 PB23_SPI_SCK
Clock for serial peripheral
interface, always implemented,
bus type
Pin 6, U7
19
DGND
Ground
Ground
20
VDD_3V3
Power for the AppIO Module
Power for the AppIO Module
