Power Supply - ST STM32G081B-EVAL User Manual

Hardware layout and configuration
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Power supply

The STM32G081B-EVAL Evaluation mother board is designed to be powered by 5 V DC
power supply and is protected by PolyZen from wrong power plug-in event. It is possible to
configure the mother board to use any of the following four sources for the power supply:
• 5 V DC power adapter connected to CN16, the power Jack on the board (Power
Supply Unit on silk screen of JP17 (PSU)). The external power supply is not provided
with the board.
• 5 V DC power with 500 mA limitation from CN6, the USB Micro-B connector of
STLINK/V2-1 (USB 5 V power source on silkscreen of JP17 (STlk)). If the USB
enumeration succeeds, the ST-LINK U5V power is enabled, by asserting the PWR_EN
pin. This pin is connected to a power switch, which powers the board. This power
switch features also a current limitation to protect the PC in case of short-circuit on the
board. If overcurrent (more than 500 mA) happens on the board, the LED LD5 lights
up.
• 5 V DC power from CN6 directly, the USB Micro-B connector of STLINK/V2-1 (USB 5 V
power source on silkscreen of JP17 (U5V)).
• 5 V DC power from CN5 or CN9, the extension connector for daughterboard power
source (D5V) on silkscreen of JP19).
The UCPD daughterboard uses its own 19V power adapter to support USB PD, in this case
the mother board uses D5V from the UCPD daughterboard to supply all circuits on
STM32G081B-EVAL Evaluation board. D5V of the UCPD daughterboard has three sources
as below:
•
19 V DC power adapter connected to CN3 on the UCPD daughterboard
•
Power from Type-C Port1 CN7 on the UCPD daughterboard
•
Power from Type-C port2 CN5 on the UCPD daughterboard
19 V DC power adapter and Type-C Port1 sources are automatically selected by circuit (D8
and T10 on the UCPD daughterboard). Refer to Table15 for detail.
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