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LPC176x SPI and PDM microphone

Question asked by Jeremy Bonhomme on Aug 9, 2018
Latest reply on Aug 10, 2018 by Jeremy Bonhomme

Hello,

 

I'm currently designing a board around LPC1765. I use a PDM microphone and I would like to interface it directly to the MCU. I saw few example with differents methods :

 

SPI in master mode : PDM in another 8-pin CPU | Words from Cheshire Engineering Corp. 

SPI in slave mode : https://community.nxp.com/message/766857?commentID=766857#comment-766857 

I2S interface (see attached doc)

 

First question : is it possible to interface PDM signal with LPC MCU ?

Second : is there any best solution between SPI master / slave and I2S ?

 

Thank you in advance

 

Regards

 

Jeremy BONHOMME

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