Hardware description
UM2183
12/24
DocID030409 Rev 2
2.2
STM32 Nucleo connections
The X-NUCLEO-IDW04A1 expansion board is designed to be plugged directly on the
STM32 Nucleo board connectors. The X-NUCLEO-IDW04A1 is configured by default to be
compatible with as many STM32 Nucleo boards as possible. It may also be configured, via
jumper or resistor placement, to use different I/O configurations to match specific customer
targets.
2.3
UART/SPI interface and GPIO connection options
The connection between the SPWF04SA and the STM32 Nucleo board is made via a four-
wire UART (with hardware flow control; refer to
Table 9: "SPWF04SA module UART
interface with STM32 Nucleo board"
) or a five-wire SPI (see
Table 10: "SPWF04SA module
SPI interface with STM32 Nucleo board"
), and some GPIOs.
A multiple connection arrangement offers the maximum modularity.
The alternative pins could be useful in case of conflicts with additional STM32 Nucleo
expansion boards.
Table 9: SPWF04SA module UART interface with STM32 Nucleo board
SPWF04SA
Pin/Signal
STM32 pin
Placement
6/TXD
PA9
CN10 – pin 21
CN5 – Pin 1
To use this connection: mount R31 and remove R39 (Default)
PA3
(1)
CN10 – pin 37
CN9 – Pin 1
To use this connection: mount R39 and remove R31
8/RXD
PA10
CN10 – pin 33
CN9 – Pin 3
To use this connection: mount R37 and remove R38 (Default)
PA2
(1)
CN10 – pin 35
CN9 – Pin 2
To use this connection: mount R38 and remove R37
9/CTS
PA0
CN8 – pin 1
CN7 – pin 28
To use this optional connection: mount R8
10/RTS
PA1
CN8 – pin 2
CN7 – pin 30
To use this optional connection: mount R10
Notes:
(1)
Please refer to UM1724 for instructions on modifying the STM32 Nucleo board to use these pins.
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