8 Reference design
8.1 Description
The reference design shown in the following figures is based on an STM32U575/585 device in LQFP144.
This reference design can be tailored to any STM32U575/585 device with a different package, using the pin
correspondence given in Section 8.2 .
Clock
Two clock sources are used for the MCU (see Section 4 for more details):
• LSE: X2– 32.768 kHz crystal for the embedded RTC
• HSE: X1– 16 MHz crystal for the MCU
Refer to Section 4 for more details.
Reset
The reset signal is active low in the reference design figures shown in Section 8.2 .
The reset sources include:
• the reset button (B1)
• debugging tools via the connector CN1
Refer to Section 2.4 for more details.
Boot mode
The user can add a switch on the board to change the boot option.
Refer to Section 5 for more details.
Note: When waking up from Standby mode, the BOOT pin is sampled and the user must pay attention to its value.
SWD interface
The reference design shows the connection between the STM32U575/585 device and a standard SWD
connector.
Refer to Section 6 for more details.
Note: It is recommended to connect the RESET pins, so as to be able to reset the application from the tools.
Power supply
Refer to Section 2 for more details.
AN5373
Reference design
AN5373 - Rev 1
page 28/37
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