6.6.2 Push-buttons
B1 (USER)
The user button is connected to the STM32WL I/O PA0 by default (WKUP1, SB16 ON, and SB15 OFF) or PC13
(WKUP2, SB15 ON, and SB16 OFF) of the STM32WL microcontroller.
B2 (USER)
The user button is connected to the STM32WL I/O PA1 of the STM32WL microcontroller.
B3 (USER)
The user button is connected to the STM32WL I/O PC6 of the STM32WL microcontroller.
B4 (RESET)
This push-button is connected to NRST and is used to RESET the STM32WL microcontroller.
6.6.3 RF overview
The STM32WL Nucleo-64 board embeds an RF 3-port switch (SP3T) to address, with the same board the
three modes: reception, high-power transmission, and low-power transmission. The choice between the two
transmission modes can be done dynamically, thanks to two DC switches controlled by FE_CTRL1 (GPIO from
STM32WL MCU):
• The transmission high-output power amplifier (PA HP) is supplied from the PA regulator (REG PA) up to
3.1 V. For this, the REG PA must be supplied directly from VDDSMPS.
• The transmission default low-output power amplifier (PA LP) can be supplied from the PA regulator (REG
PA) up to 1.35 V. For this, the REG PA must be supplied from the regulated VFBSMPS supply at 1.55 V.
The RF block diagram is displayed in Figure 18.
UM2592
Board functions
UM2592 - Rev 1
page 26/49
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