Connecting 8 PDM microphones to STM32N6

Tuomas95 · ‎2025-08-05

Is it possible to connect 8 PDM microphones to the STM32N6 via MDF?

ELABI.1 · ‎2025-08-08

It is not possible to connect 8 PDM microphones directly to the STM32N6 via the MDF interface because the MDF has six digital serial interfaces. However, you can connect up to 8 PDM microphones by using the SAI peripheral's PDM interface.

This is mentioned in the Datasheet specifically section "3.48 Serial audio interface (SAI)", as shown in the screenshot below:

and also, in the Application Note AN5027 specifically section "2.2.3 Using PDM interfaces":

Thanks.

ELABI.1

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ELABI.1 · ‎2025-08-08

Hi @Tuomas95,