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How do I talk to another SPI device while waiting for the AD7190 !RDY pin to go low ?

Question asked by EasyStreet on Nov 25, 2016
Latest reply on Dec 22, 2016 by EasyStreet

How do I talk to another SPI device while waiting for the AD7190 !RDY pin to go low ?

 

Hi,

I'm using an ADC and DAC on the same SPI bus.

I need to read the AD7190 and write to the DAC every ms.

The problem is that I have to hold ChipSelect low for the AD7190 while waiting for !RDY pin to go low (ie, conversion ready)

This effectively means I can't do anything else on the SPI bus while the ADC is converting.

 

Is there any way to get a valid reading from the AD7190 without holding CS low the whole time ?

Would a faster ADC be the answer ? Looking at the 7176 with higher sampling rate I can get a conversion much quicker meaning I won't have to wait too long for DOUT/!RDY

 

Regards,

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