Component description
UM2183
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DocID030409 Rev 2
3
Component description
This section describes the devices included in the X-NUCLEO-IDW04A1 expansion board.
3.1
SPWF04SA module
The SPWF04SA module is FCC (FCC ID: S9NSPWFS04), IC (IC: 8976C-SPWFS04) and
CE certified.
It embeds a low power Wi-Fi b/g/n transceiver SoC, which is a highly integrated Wi-Fi
system dedicated to the WLAN management and compliant with Wi-Fi network
specifications. It interfaces with the STM32 Nucleo boards via UART or SPI and some
GPIO pins.
The SPWF04SA module also integrates an SMD antenna and has an embedded 38.4 MHz
oscillator for the embedded Wi-Fi radio.
Table 11: SPWF04SA module details
Feature
Description
Sales type
SPWF04SA
Package
SMD 35 pin
Operating voltage
Typ. 3.3 V
3.2
User push-buttons and LEDs
The X-NUCLEO-IDW04A1 expansion board has two push-buttons and four LEDs to control
certain I/O signals and transmit SPWF04SA module status information.
The associated hardware and firmware functions are shown in the following table.
Table 12: Push-buttons and LED functions
Feature
Description
RESET
Push the SW1 push-button on the board
WPS
Push the SW2 push-button on the board
3.3 V board power supply on
LED 1 (green)
HEARTBEAT (GPIO10)
LED 2 (blue)
CONSOLE (GPIO14)
LED 3 (red)
STATUS (GPIO13)
LED 4 (yellow)
3.3
User interface configuration
To properly interface the X-NUCLEO-IDW04A1 expansion board according to the selected
user mode (UART or SPI), you have to configure jumpers JP6, JP7, JP8 and JP9 as
specified in
Table 13: "X-NUCLEO-IDW04A1 board user mode configuration settings"
.
The X-NUCLEO-IDW04A1 board default configuration is VCOM UART.
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