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B-WL5M-SUBG1 Current Consumption is Too High

Mona-Roza
Associate II

Hello,

I'm working with B-WL5M-SUBG1 hardware for experiencing STM32WL5MOCH6U. 

I ran the application from Repository\STM32Cube_FW_WL_V1.3.1\Projects\B-WL5M-SUBG1\Applications\Sigfox

I got current of about 2.3mA in standby mode instead of  less than 1uA as specified in the datasheet and I discovered that the 5V_PWR LED(LD4 Green) was ON.

I broke the SB14 to prevent the 5V_PWR LED from turning on: 

MonaRoza_0-1760105315024.jpeg

Current down to 900uA-950uA band with this move.

After that I applied this post's recommendations. 

Current down to 875uA-810uA band.

MonaRoza_2-1760106106804.png

 

But I unfortinatelly I'm still far away from 1uA. Anyone has soluion?

1 ACCEPTED SOLUTION

Accepted Solutions
Mona-Roza
Associate II

Okay, we solved it. We were only supplying power from JP2. I think, somehow DC switches pass current backwards and increase the consumption. So when we plug in the SMod+ adapter board and apply power (while keeping the uart GPIOs in PullUp and GPIO 15 in PullDown), the consumption started to oscillate between 1.25uA and 1.45uA: 

MonaRoza_0-1760339454595.png

But, I think DC switches still have a problem with reverse current.

Thank you.

View solution in original post

1 REPLY 1
Mona-Roza
Associate II

Okay, we solved it. We were only supplying power from JP2. I think, somehow DC switches pass current backwards and increase the consumption. So when we plug in the SMod+ adapter board and apply power (while keeping the uart GPIOs in PullUp and GPIO 15 in PullDown), the consumption started to oscillate between 1.25uA and 1.45uA: 

MonaRoza_0-1760339454595.png

But, I think DC switches still have a problem with reverse current.

Thank you.