STM32U5 SAI interface to 6 PDM microphones

[Gerva]

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,

[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 

[poorElecStudent]

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