I need urgent help on STM32L071 RTC power consumption. when we enable standby mode, without RTC, the current from battery is <1uA . when we enable standby mode, WITH RTC, the current from battery is ~200 uA ? Which is too high to sustain

I need urgent help on STM32L071 RTC power consumption.

when we enable standby mode, without RTC, the current from battery is <1uA

. when we enable standby mode, WITH RTC, the current from battery is ~200 uA ?

Which is too high to sustain

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Senior

Did you check the current consumption of rtc?

Lead III

I might expect such high current if HSE / HSI / MSI clock was still running.

How are you clocking RTC?

What value do you have in RCC->CSR for RTCSEL?

If in doubt, check the reference manual for your stm32. I's a great resource and we should be grateful that ST provide such full documentation.

Much vital information is hidden by stm32cube which gets code running quickly but doesn't always give the best solution.

Hope this helps,

Danish

Associate

Thank you for the valuable response.

The cause was identified to the RESET PIN PULL UP resistor.

I had connected this to another supply, which becomes zero.

Thereby forcing the CPU under reset and still getting the supply from battery.

Now I am working on wakeup from standby mode upon power resumption,

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