The headers (EXT1 and EXT3) on the WLR089 Xplained Pro Evaluation board offer access to the I/O of the module in order to expand the
board by connecting extensions to the board. These headers are based on the standard
extension header specified in Xplained Pro Standard Extension Header. The headers have a pitch of 2.54 mm.
Table 1. EXT1 Extension Header
| EXT1 |
Pins on WLR089U0 Module |
Shared Functionality |
| Pin |
Signal |
| 1 |
ID |
— |
— |
| 2 |
GND |
GND |
— |
| 3 |
ADC(+) |
PA06 |
QTouch Button |
| 4 |
ADC(-) |
PA07 |
Target USB |
| 5 |
GPIO1 |
PA08 |
EDBG, EXT3 |
| 6 |
GPIO2 |
PA28 |
Mechanical Button |
| 7 |
PWM(+) |
PA18 |
LED1 |
| 8 |
PWM(-) |
PA19 |
LED0 |
| 9 |
IRQ |
PA22(1) |
EDBG, Serial Flash |
| 10 |
SPI_SS |
PA15 |
Target USB, EDBG, optional 12 MHz external crystal |
| 11 |
TWI_SDA |
PA16 |
EXT3, EDBG |
| 12 |
TWI_SCL |
PA17 |
EXT3, EDBG |
| 13 |
UART_RX |
PA05 |
EDBG |
| 14 |
UART_TX |
PA04 |
EDBG |
| 15 |
SPI_SS |
PA23 |
— |
| 16 |
SPI_MOSI |
PB22 |
EXT3, EDBG, Serial Flash |
| 17 |
SPI_MISO |
PB02 |
EXT3, EDBG, Serial Flash |
| 18 |
SPI_SCK |
PB23 |
EXT3, EDBG, Serial Flash |
| 19 |
GND |
GND |
— |
| 20 |
VCC |
— |
Supply to peripherals |
Note:
- 1.Disconnect the jumper cap on J306
to use the IRQ line at pin 9 in the EXT1 header.
Table 2. EXT3 Extension Header
| EXT3 |
Pins on WLR089U0
Module |
Shared Functionality |
| Pin |
Signal |
| 1 |
ID |
— |
— |
| 2 |
GND |
GND |
— |
| 3 |
ADC(+) |
— |
— |
| 4 |
ADC(-) |
— |
— |
| 5 |
GPIO1 |
PA27 |
EDBG |
| 6 |
GPIO2 |
— |
— |
| 7 |
PWM(+) |
— |
— |
| 8 |
PWM(-) |
— |
— |
| 9 |
IRQ |
— |
— |
| 10 |
SPI_SS |
PA08 |
EXT1, EDBG |
| 11 |
TWI_SDA |
PA16 |
EXT1, EDBG |
| 12 |
TWI_SCL |
PA17 |
EXT1, EDBG |
| 13 |
UART_RX |
— |
— |
| 14 |
UART_TX |
— |
— |
| 15 |
SPI_SS |
PA14 |
EDBG, optional 12 MHz external crystal |
| 16 |
SPI_MOSI |
PB22 |
EXT1, EDBG, Serial Flash |
| 17 |
SPI_MISO |
PB02 |
EXT1, EDBG, Serial Flash |
| 18 |
SPI_SCK |
PB23 |
EXT1, EDBG, Serial Flash |
| 19 |
GND |
GND |
— |
| 20 |
VCC |
— |
Supply to peripherals |