I'm using the AD7192 ADC for a measurement unit. On startup I do all the configuration and then set the ADC into continuous read mode by writing b'01011100 to the command register. Now I need to set one of the ADC's GPO during operation what doesn't work. It seems to me like already the write operation to the command register fails - I'm sending b'00101000. According to the datasheet(page 31) I've to send this command while the nRDY/DOUT is low, but what I don't understand is, when the nRDY/DOUT is low and I start to clock, the ADC will send the current conversion so the nRDY/DOUT starts alternating. Did I miss something?


1 Answer 1


Seems like the transition cannot be done in one step. One has to explicitely deactivate the continuous read mode first by writing b01011000 to the command register and then in a second run perform the write operation to the GPO register.

  • \$\begingroup\$ That sounds annoying to have to do that. \$\endgroup\$
    – Andy aka
    Jun 8, 2018 at 13:24
  • \$\begingroup\$ Think the issue is that if the R/W bit of the first write action to the command register is not '1' (so read) it simply ignores the command. \$\endgroup\$
    – po.pe
    Jun 8, 2018 at 13:27
  • \$\begingroup\$ I guess so but nice find +1 \$\endgroup\$
    – Andy aka
    Jun 8, 2018 at 13:29

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