UM1975
Component descriptions
DocID028608 Rev 1
13/20
3
Component descriptions
This section describes the devices included on the X-NUCLEO-IDW01M1 expansion
board.
check whether resistor R21 is present on the X-NUCLEO-IDW01M1 board; if it is,
please remove it as it may interfere with JTAG debug.
3.1
SPWF01SA module
The SPWF01SA module is FCC (FCC ID: VRA-SG9011203), IC (IC: 7420A-SG9011203)
and CE certified. The SPWF01SA contains a low power Wi-Fi b/g/n transceiver SoC - a
highly integrated Wi-Fi system dedicated to the WLAN management and compliant with Wi-
Fi network specifications. The interface of the device to the STM32 Nucleo boards is via a
UART interface and some GPIO pins. The SPWF01SA module also integrates an SMD
antenna and has an embedded 38.4 MHz oscillator for the embedded Wi-Fi radio.
Table 8: SPWF01SA details
Feature
Description
Sales type
SPWF01SA.11
Package
SMD 30 pin
Operating voltage
Typ. 3.3 V
3.2
User push-buttons and LED
To command certain I/O signals and signal SPWF01SA module status information, the X-
NUCLEO-IDW01M1 expansion board has two push-buttons and four LEDs.
The hardware and firmware functions associated with the push-buttons and LEDs are
shown in the following table:
Table 9: Push-buttons and LED functions
Feature
Description
RESET (hardware, by the user)
Push the SW1 push-button on the board
GPIO7_ADC1 module signal (hardware &
firmware dependent, by the user)
Push the SW2 push-button on the board
3.3 V board power supply on
LED 1 (green) lit
GPIO10 mod. signal (firmware dependent)
LED 2 (blue) lit
GPIO14 mod. signal (firmware dependent)
LED 3 (red) lit
GPIO13 mod. signal (firmware dependent)
LED 4 (yellow) lit