AnsweredAssumed Answered

AD7682 - Problem with config of channel number 2

Question asked by CarlosSM on Jun 7, 2017
Latest reply on Sep 10, 2017 by Chris_rock

Hello,

 

I am using channels 0, 1 and 2 of the AD7682 to sample analog signals. I've detected and error in the configuration of channel 2 so, to debug, I am accessing each channel without sequencer. The first word sent is the configuration and then I've always sent 0's. The readback configuration in each case is:

 

Channel 0: Cfg register: 0x3848  ---  ReadBack value:  0x3848

Channel 1: Cfg register: 0x38C8  ---  ReadBack value:  0x38C8

Channel 3: Cfg register: 0x39C8  ---  ReadBack value:  0x39C8

 

Channels 0 and 1 are connected to analog signals while channel 3 is tied ground. Until here all configurations seems to work properly. The problem is related to channel 2 who is connected to an analog signal.

 

Channel 2: Cfg register: 0x3948  ---  ReadBack value:  0x3CA4

 

As it can be seen, configuration read is different from the one written. I have no idea where can be the problem since the piece of code used to configure each case is the same.  

 

Any idea would be appreciate.

 

Thank you in advance.

 

Outcomes