VIN is the 7 to 12 V DC power from the ARDUINO
®
connector (CN6 pin 8). The 5V jumper selection (JP3) must
be on [7-8] to select the VIN power source. In that case, the DC power can come from the ARDUINO
®
Uno V3
battery shield and is compatible with Adafruit
®
PowerBoost 500 shield.
An LDO (U14) is used to provide a fixed 5 V from VIN (7-12 V).
E5V is the DC power coming from an external 5 V DC power source from the extension connector (CN7 pin 6.)
The 5V jumper selection (JP3) must be on [3-4] to select the E5V power source.
VBUS_STLK is when a DC power charger is connected to the STLINK-V2EC USB connector (CN1). To select the
CHG power source, the 5V jumper selection (JP3) must be on [9-10]. If an external USB charger powers the
STM32U083C-DK Discovery kit, then the debugging feature through CN1 is not available. If a host computer is
connected instead of the charger, it is recommended to select the STLK power source.
5V_USB is a 5 V DC power with limitations from the USB Type-C
®
connector (CN14). In this case, the 5V jumper
selection (JP3) must be on [5-6] to select the USB power source on the JP3 connector.
6.4.2 Programing/debugging when the power supply is not from STLINK-V2EC (STLK)
In case the current consumption of the Discovery kit and the expansion boards exceeds the allowed current on
the ST-LINK USB connector, the external power VIN, E5V, or user USB can be used. In such a case, it is still
possible to use the embedded ST-LINK for VCP programming and debugging. In this case, the following power
sequence procedure must be respected:
1. Set the JP3 jumper according to the 5 V selected external power source.
2. Connect the external power source according to Table 7.
3. Power on the external power supply.
4. Check that the 5 V green LED (LD6) is turned ON.
5. Connect the PC to the USB connector (CN1) for programming/debugging.
If this sequence is not followed, the STLINK-V2EC V
BUS
might first supply power to the board, and the following
risks might be encountered:
• If the board needs more than 500 mA current, the PC might be damaged or the current limited by the PC.
Therefore, the board is not powered correctly.
• 500 mA is requested at the enumeration: This request is rejectable and the enumeration does not succeed
if the PC does not provide such a current. Consequently, the board is not power supplied (
LED LD6
remains OFF).
6.4.3 VDD IDD measurement
The IDD‑labeled jumper (JP7) is used to measure the consumption of the STM32 microcontroller by removing the
jumper and connecting an ammeter or any other current measurement tool:
• Jumper ON: The STM32 microcontroller is powered (default configuration).
• Jumper OFF: To power and measure the consumption of the STM32 microcontroller, an ammeter, or an
external 3.3 V power supply must be connected.
The IDD jumper can be used to perform the current consumption for both 3.3 and 1.8 V MCU voltages.
UM3292
Hardware layout and configuration
UM3292 - Rev 1
page 13/33
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