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STM32F427 DAC PA4 and PA5 Voltage Spike on Power Down

Question asked by rhodes.ethan on Jun 30, 2015
Latest reply on Jul 2, 2015 by waclawek.jan
I am using the DAC outputs on PA4 and PA5 of the STM32F427 LQFP 100 pin part. On power down, these pins show a voltage spike in the range of 1-3V and 50-100mS in length. It didn't seem to matter how the pins were configured or if they were not configured at all. 

I didn't see this same phenomenon on other pins so I am guessing it is specific to the DAC outputs. I also did not see this when I looked at STM32F429 or a STM32F207 parts. I can't imagine this is expected behavior. Errata did not have any information.

Has anyone else seen this? 

Thank you,
Ethan

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