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RDY not going low on AD7192?

Question asked by enrichium on Feb 4, 2015
Latest reply on Apr 19, 2017 by JellenieR

Hi,

 

I am trying to use an AD7192 in continuous conversion mode using 2 bipolar channels, but the RDY pin is not going low.

 

I am interfacing to a MC9S08LH64 micro controller using the SPI mode.

 

I start communicating with the ADC by writing to the config and mode registers to do a zero scale and full scale calibration on both 0 and 1 bipolar channels.  This action seems to be working because I can read the data in these registers, and it's the same as I sent.  I then write to the config and mode registers to set the filter to sinc3 and to put it into continuous conversion.  I then write 01011100 to the communications register.

 

No pulses appear on the RDY pin to indicate conversions are taking place.

 

I have written 1000 0000 0000 0011 0001 0111 to the config register, and I can confirm that this register has been written by reading back the contents.

 

I have written 0001 0100 1000 0100 0010 0000 into the mode register and can also confirm that it's been written.

 

Is there anything I'm doing wrong?

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