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STM32L1 and STM32L4 Series LSE 32,768Khz Startup Problem

Question asked by fallah.omid on May 3, 2017
Latest reply on May 15, 2017 by fallah.omid

Hi all,


I have 3 boards with 3 different MCUs, one with STM32L053R8T6, one with STM32L152RCT6, and one with STM32L443RCT6.


All use same 32,768Khz LSE crystal and 12pF caps. But only STM32L053 works fine when LSE is turned on ...

other two MCUs jump to Error handler function. i used STM32Cube for all 3 MCUs. a simple program to turn on LED for example ...

I even changed the crystal with another type, or increased LSE Timeout Value in STM32Cube to 10000 but still no result.

I checked in Debug, the LSERDY flag is not activated and it leads to Timeout and jump to Error Handler function.


What can be the problem ?!