ST STM32G0C1E-EV, User Manual

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The following power sequence procedure must be respected:
1.
Connect the JP24 jumper in E5V or D5V configuration.
2. Check that JP1 is removed.
3. Connect the external power source to PSU or D5V (daughterboard mounted).
4. Check that the LD7 green LED is turned ON.
5. Connect the PC to the CN5 ST-LINK USB connector.
If this order is not respected, the board may be powered by V
BUS
first then E5V or D5V, and the following risks
may be encountered:
1.
If more than 300 mA current is needed by the board, the PC may be damaged or the current can be limited
by the PC. As a consequence, the board is not powered correctly.
2. 300 mA is requested at enumeration (since JP1 must be OFF), so there is a risk that the request is rejected
and enumeration does not succeed if the PC cannot provide such current.
3. Consequently, the board is not powered (LD7 LED remains OFF).
In case the STM32G0C1E-EV Evaluation board is powered by a USB charger through CN5, there is no USB
enumeration needed. The user can set JP24 to VUSB to allow the board to be powered anyway from CN5. The
power source is selected by setting the JP24, JP16, and JP17 related jumpers as described in
Table 4 .
Table 4. Power source related jumpers
Jumper Description (1)
JP24
For 5 V power supply from USB (CN5) of ST-LINK/V2-1 through STMPS2141STR power switch (with
OVC protection) to the STM32G0C1E-EV Evaluation board, JP24 is set as shown:
VUSB E5V D5V STLK
For 5 V power supply from the daughterboard connectors (CN3 or CN10) to the STM32G0C1E-EV
Evaluation board, JP24 is set as shown:
VUSB E5V D5V STLK
For 5 V power supply, from PSU jack (CN20) to the STM32G0C1E-EV Evaluation board, JP24 is set as
shown:
VUSB E5V D5V STLK
For 5V power supply directly from CN5 V
BUS
pin to the STM32G0C1E-EV Evaluation board without OVC
protection, JP24 is set as shown:
VUSB E5V D5V STLK
JP16
The V
BAT
pin of MCU is connected to VDD when JP16 is set as shown:
The V
BAT
pin of MCU is connected to a 3 V battery when JP16 is set as shown:
JP17
VDD is connected to +3.3 V when JP17 is set as shown:
UM2783
Power supply
UM2783 - Rev 1
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