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HAbay.1
Associate III
August 3, 2021
Question

Bluepill current draw way too high even in standby mode ,is it because of the LEDs?

  • August 3, 2021
  • 5 replies
  • 2401 views

I've been having issues with my bluepill chip ( stm32f103c8t6) concering its significant current draw . I know that bluepills aren't the best choice for low power projects but they should at least draw less than 670µA in stand by mode ( according to the PCC tool in cubemx) . I've also heard people say that removing the built in LEDS(PC13 and PWR led) will reduce the current consumption drastically , is it true and is it safe to just desolder them ?

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5 replies

TDK
August 3, 2021

What is "significant current draw"?

Removing LEDs will certainly help. D1 and D2 draw about 3mA each. D2 only draws current if PC13 is low.

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HAbay.1
HAbay.1Author
Associate III
August 4, 2021

by significant i mean about 4.4 mA in standby mode and 10mA while operating , which is quite a lot compared to what other chips can reach . I do appreciate your answer though , with the leds removed i can at least reduce it to 1mA.

HAbay.1
HAbay.1Author
Associate III
August 7, 2021

by tweaking the settings a bit ,i even managed to lower it to 140µA, which is not bad , but i can do even better once i figure out how to switch from VDD to Vbat digitally and reset the chip once the rtc alarm triggers.