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Looking for detailed info on adau1961 spi protocol

Question asked by danAlbert on Sep 27, 2012
Latest reply on Oct 3, 2012 by BrettG

The datasheet has very little data on this protocol.

It does not seem to mention the inactive clock polarity.

I have assumed that it is low (from the very vague spi protocol image)

The MISO data should be read on the rising edge.

 

I assume to read register 0x402d I would:

 

clock the enable low three times (with a 1 msec delay on edge changes)

 

pull the enable low

send 0x01     //the address plus the read bit

send 0x40

send 0x2d

drive the master with a dummy write and read the slave.

drive enable high

 

So when I do this the ada1961 pulls the MISO data line low just after the 0x2d and that's all I get.

I know this register defaults to  0xAA from the data sheet.

 

Any help would be appreciated!

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