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AD7658 -reading data

Question asked by Avien on Oct 22, 2013
Latest reply on Nov 3, 2013 by Avien

Hello.

I've got little problem with reading data from AD7658. I am using it in hardware and parallel mode. After power up, sending pulse signal to reset pin (with CONVST X high) and the high-to-low CONVST edge followed by a low-to-high CONVST edge, I set CS low.

After that I oscillate with RD to get data

 

RD

0           first valid data

1

0           second valid data

1

0           third valid data

1

0           zeros

1

0           zeros

1

0           zeros

 

then CS go up, CONVST down and up to start next conversion.

Attached image show what I mean.

V1-V6 are all connected to the same voltage.

Problem is that why data read from V4, V5 and V6 contains only zeros?

 

 

I would be very thankful if you can help me to solve this problem.

 

Best Regards,

Avien

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