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Gerva
Associate
March 13, 2024
Solved

STM32U5 SAI interface to 6 PDM microphones

  • March 13, 2024
  • 2 replies
  • 1317 views

Hi,

I am considering STM32U5 to interface up to 6 PDM microphones. I see that  with some STM32U5 version 2 SAIs interface are available. How many PDM microphone can I interface in this case? I found some specific documentation related to G4 (up to 6 microphones) and H7 series (up to 8 microphones) and I would like to be sure about U5.

Best regards,

Best answer by STTwo-32

Hello @Gerva 

According to the RM0456, "Up to 4 digital microphone pairs can be connected in parallel. Depending on product implementation, less microphones can be supported." For more details, refer to the 69.4.10 of the reference manual.

Best Regards.

STTwo-32 

2 replies

STTwo-32
STTwo-32Answer
Technical Moderator
March 13, 2024

Hello @Gerva 

According to the RM0456, "Up to 4 digital microphone pairs can be connected in parallel. Depending on product implementation, less microphones can be supported." For more details, refer to the 69.4.10 of the reference manual.

Best Regards.

STTwo-32 

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    poorElecStudent
    Explorer
    March 16, 2024

    Hi @STTwo-32,

    I am working on a 6 pdm mic with stm32h7, is there any sample code for it? Also when configuring the code, I found the real audio frequency is way lower than the expected value (It is somehow capped and turns grey on the IDE).

    Thanks

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