NUCLEO-G491RE Standby mode power consumption test

[LPetr.1]

I have ordered NUCLEO-G491R to test STANDBY mode power consumption. The power consumption measurements are taken via the PPK2 from Nordic.

https://www.nordicsemi.com/Products/Development-hardware/Power-Profiler-Kit-2
The steps:

1. Take STM32CubeMX example project PWR_SHUTDOWN that is available for the Nucleo board.

2. Program the board (ensure the JP5 jumper is at the 5V_STLK position)

3. Remove the JP5 jumper because we will be powering the board via the external 3V3 (PPK2)

4. Connect the PPK2 to 3V3 and GND on the board.

5. Start sampling

See the results below:

When the device enters STANDBY, the current consumption is measured at about 1.5mA which is way above what is declared on the datasheet.

What could be the reason that I cant achieve the declared current consumption for the STANDBY mode via the official example project? I am convinced that measurements of the PPK2 are valid as I have used this board in the past to measure very low currents and it was showing reasonable results.

Thanks in advance for any tips/suggestions.

[mƎALLEm]

Hello,

According to picture you shared, you seems measuring the current consumption of the board not the power consumption of the MCU.

You need to measure the power consumption on JP6.

[LPetr.1]

Thanks for reply. Il measure the current via the JP6 tommorow.

Can you explain what else could be consuming so much power on the board?