How to adapt an STM32L432 Nucleo-32/Nucleo-64/ Nucleo-144 to power the MCU from the Ardui-
36/41 UM2243 Rev 2
15.3 How to adapt an STM32L496 Nucleo-144
to power the MCU from the Arduino AREF pin
This appendix provides an example to adapt a STM32L496 Nucleo-144 to power the MCU
only from the Arduino AREF pin instead of Arduino 3.3V pin. This adaptation allows to
isolate MCU supply from peripherals (ST-LINK) in order to only measure MCU power
consumption.
This example refers to the NUCLEO-L496ZG schematics (MB1312) available from the
www.st.com/stm32nucleo web page.
1. Remove jumper JP5: IDD measurement, to disconnect the MCU’s VDD from +3V3
2. Remove jumper JP6: +5V power source selection, to disconnect +5V from VIN_5V,
U5V, and E5V
3. Ensure that SB152 and SB158 are closed, and that SB167 is open: AVDD is connected
to VDD; AVDD is not connected to VDD_MCU
4. SB122 is closed; SB1, SB8, SB121 and SB127 are open. In this example, discrete
SMPS are not used. There is a direct bypass between VDD and VDD_MCU. PG10,
PG11, PG12, and PG13 should be set in high impedance by the STM32L496 software.
5. SB198, SB199, SB200, SB201, SB134, SB135, SB142 and SB143 are open: remove
connection to USB.
6. Remove jumper CN4_1-2: SWCLK from ST-LINK to MCU
7. Remove jumper CN4_3-4: SWDIO from ST-LINK to MCU
8. Remove jumper JP3: NRST from ST-LINK to MCU
9. Open SB141: SWO from ST-LINK to MCU
10. Open SB109: MCO clock from ST-LINK to MCU (set HSI or use external crystal as the
MCU clock reference)
11. Open SB131: STLK_RX of Virtual COM port
12. Open SB130: STLK_TX of Virtual COM port
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