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STM32U585 CLOCK JITTER

Ephraimoved
Associate III

Dear Sir.

I am using a board equipped with STM32U585 , The main clock is 32.768 khz

see included pic.

PA8 is configured to drive LSE 32KHZ using the command
__HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_HIGH);

PA8 is fed to ECG MAX30001.

On some boards MAX30001 reports pll lock problem.

The signal of  32 khz on PA8 is shown at the attached video.

Setting the parameter __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_HIGH); to
0 or RCC_BDCR_LSEDRV_0 or RCC_BDCR_LSEDRV_1 makes no change on the jitter


1. Is this jitter is normal.


Please Advise

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