NUCLEO-WBA65RI Standby current higher than expected

[JPortilha]

Title edited to clarify that this refers to a NUCLEO-WBA65RI board.

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Hello, 

I am currently using STM32WBA65RI with Standby mode. According to datasheet, this mode should be able to reach 120nA current consumption with the 16 GPIO wake-up pins (RTC disabled). However running the Standby example and shutting down the RTC I am still getting 3uA of current consumption. What can I do to decrease the current consumption up to the nanoA?

Best regards.

[JPortilha]

I am using a Keysight B2901A for measurement. Connected directly to the MCU board.

The schematic is the one given by ST, I am not using any custom board.

It seems that, but actually it shouldn´t be waking up. I don´t think there is anything on the code that can do that.

[Andrew Neil]

I mean the schematic of how, exactly, you are connecting the SMU to the board.

[JPortilha]

I am connecting like this:

 

[Andrew Neil]

So you still have the mezzanine board attached!

My suggestion was that you remove the BLE board from the mezzanine - thus completely disconnecting everything, and ensuring that you are powering only the BLE part.

[JPortilha]

I have already tried that.. in that case I connect Vdd into PIN1 of CN4 and GND into PIN3 of CN4.