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problem with the continous mode of AD7738

I cannot read the status and data registers in the continuous mode of AD7738. The single mode is OK. On page 23 of the data sheet in fig.12 the value of the mode register for the continuous mode is wrong. Couldn't find errata for the AD7738.Any idea?

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  • Thanks Chris,

    Find attached 2 more scope pictures. You can see that the DIN is low when the CS is low after the chip enters the continuous mode.

    Basically at this point the DIN is a mirror image of the CS. There is no delay between these 2 signals – they are exactly the same in time (only after the Ready pin goes low indicating that

    The conversion is complete and I can read the first status and data register content).

    Still no effect- no data come out from the Dout output of the chip.

    For now I’ll stop my investigation of this issue.

    Of course if you come up with some suggestion what could be done to have the continuous mode functioning you can e-mail me but I tried everything. Just let me know if by any chance you

    Know another customer using successfully this continuous mode. I really need it because I have to read the data from many, many channels…

    And thanks again for your help. I won’t bother you with questions any more.

    Have a nice day!

    Kindest Regards,

    Peter

    attachments.zip
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  • Thanks Chris,

    Find attached 2 more scope pictures. You can see that the DIN is low when the CS is low after the chip enters the continuous mode.

    Basically at this point the DIN is a mirror image of the CS. There is no delay between these 2 signals – they are exactly the same in time (only after the Ready pin goes low indicating that

    The conversion is complete and I can read the first status and data register content).

    Still no effect- no data come out from the Dout output of the chip.

    For now I’ll stop my investigation of this issue.

    Of course if you come up with some suggestion what could be done to have the continuous mode functioning you can e-mail me but I tried everything. Just let me know if by any chance you

    Know another customer using successfully this continuous mode. I really need it because I have to read the data from many, many channels…

    And thanks again for your help. I won’t bother you with questions any more.

    Have a nice day!

    Kindest Regards,

    Peter

    attachments.zip
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