Disabling TCXO in the software

[JustSomeGuy]

I am using the B-L072Z-LRWAN1 and trying to optimize for low power consumption. So far I have set up the hardware by desolding SB37, SB18, R26, and D2. Now when moving JP9 from pos. 2-3 to pos. 1-2 (i.e. TCXO powered from PA12 instead of VDD_RF_LRA), I notice that the power draw changes from ~1 mA to ~3 mA. I tried disabling PA12 in CubeMX but that did not do anything.

I found this solution, but i am not using any software packs other than a simple header file for the sx1276, so i can not find this mlm32l0xx_hw_conf.h file it is referring to. How else can I completely disable TCXO in the software without adding any software packs?

[STTwo-32]

Hello @JustSomeGuy 

The only way that we support is the one that you have previously mentioned.

Best Regards.

STTwo-32

[Andrew Neil]

Did you see this regarding use of PA12:

https://community.st.com/t5/stm32-mcus-wireless/current-consumption-in-stop-mode-using-b-l072z-lrwan1/m-p/448134/highlight/true#M14432

EDIT:

See also:

https://community.st.com/t5/stm32-mcus-wireless/excess-current-consumption-running-b-l072z-lrwan1-from-battery/td-p/322961