7.4 Power supply
7.4.1 5 V power supply
The STM32MP135F-DK Discovery kit is designed to be powered by a 5 V DC power source at 3 A maximum
such as:
• 5V_VBUS connected to the CN12 connector through a USB Type-C
®
to USB Type-C
®
cable
The two lines USB_PWR_CC1 and USB_PWR_CC2 are connected to PF12 and PA3 respectively to check
what is connected to CN12 and control features enabling:
– Legacy cable
– Personal computer
– 5 V DC power source at 3 A
Depending on the current needed on the devices connected to the USB port, and the board itself, power
limitations can prevent the system from working as expected. The user must ensure that the STM32MP135F-DK
Discovery kit is supplied with the correct power source depending on the current needed. It is recommended to
use a USB Type-C
®
to USB Type-C
®
5 V / 3 A charger.
7.4.2 STPMIC1 power supply
For general information concerning the STPMIC1, refer to the datasheet on the www.st.com website.
STPMIC1 supply
• VDD_CORE (BUCK1) used to supply the CPU of the STM32MP135F
– Value: 1.35 V
• VDD_DDR (BUCK2) used to supply the DDR core and I/Os
– Value: 1.35 V
• VDD (BUCK3) used to supply the VDD domain of the STM32MP135F
– Value: 3.3 V
• VDD_CORE (BUCK4) used to supply the core of the STM32MP135F
– Value: 1.2 V
• 3V3_SW (PWR_SW) used to supply some of the 3V3 domains of the STM32MP135F-DK peripherals
– Value: 3.3 V
• VREF_DDR (LDO3) used to supply the DDR reference voltage
– Value: 0.675 V
• VDD_ADC (LDO1) used to supply the VDDA domains of the STM32MP135F
– Value: 3.3 V
• 1V8_PERIPH (LDO6) used to supply the digital core and I/Os of the CSI bridge
– Value: 1.8 V
• VDD_SD (LDO5) used to supply the microSD
™
card part
– Value: 3.3 V
• VDD_USB (LDO4) used to supply the USB PHY of the STM32MP135F
– Value: 3.3 V
7.5
Clock sources
7.5.1 LSE clock references
The LSE clock reference on the STM32MP135F microprocessor is provided by the external crystal X2:
• 32.768 kHz crystal
7.5.2 HSE clock references
The HSE clock reference on the STM32MP135F microprocessor is provided by the external crystal X4:
• 24 MHz crystal
UM2993
Power supply
UM2993 - Rev 2
page 12/42
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