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STM32L152 LSERDY

Question asked by mckenzie.allison on Aug 28, 2013
Latest reply on Aug 28, 2013 by Clive One
Hi,

I have a batch of STM32's which use the LSE.  On all of the device LSE starts normally(i.e. you can see it oscilate with a scope).  However, on a few of the devices LSERDY never aserts to indicate that the clock is running.

The levels are the same on the crystals, and we have tried moving crystals between boards, the fault stays with the processor.

We have tried routing LSE to MCO and nothing comes out on the boards with LSERDY ot aserted.

Does anybody have an idea what this could be?

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