NUCLEO-U575ZI-Q excessive current consumption

[Dadigno]

I'm using the NUCLEO-U575ZI-Q board with the PWR_ModeSelection example, and I'm measuring the current consumption with an ammeter through the JP5 (IDD) connector.

The current I measure in the different low power modes is always around 4.52 mA, which does not match the values stated in the datasheet.

I'm probably making a configuration mistake. To use the example, I followed the README included in the SDK.
As toolchain, I'm using CMake and VSCode as the IDE.

Where am I going wrong?

[Andrew Neil]

To measure really low power modes, you need to ensure that all sources of current leakage are disconnected - in particular, the ST-Link.

Unfortunately, the NUCLEO-U575ZI-Q  doesn't have the break-off ST-Link section - which is the easiest way to do that.

So you will have to thoroughly study both the User Manual and the schematics, and make all the required disconnections.

Note that just the User Manual may not be sufficient; eg, see:

Excess Current Consumption Running B-L072Z-LRWAN1 From Battery??

The User Manual can be found on the 'Documentation' tab of the board's Product Page:

https://www.st.com/en/evaluation-tools/nucleo-u575zi-q.html#documentation

The Schematics should be available on the 'CAD Resources' tab:

https://www.st.com/en/evaluation-tools/nucleo-u575zi-q.html#cad-resources

#NucleoLowPower #LowPower