how to get the READING CONVERSION RESULT?
1.as the datasheet Figure 55-56,
first, wirite the CHANNEL REGISTER, (0xFF enable all channel ) or every latency of one conversion write a new vaule
(0x0001,0x0002,0x0004.......) ,but the SDO always 0.
2. To read the CHANNEL REGISTER,the next conversion get the data i write.
Thanks for the captures.
Now, I think AD7091R-8 does not start conversion with the /CONVST pusles. The cause may be AD7091R-8 doesn't recognize the /CONVST or AD7091R-8 gets latch-up in some state.
I saw the power supplies VDD=5V takes about 50ms and VDrive taks about 40ms to ramp up. It is kind of slow.
Could you try another power supply with faster ramping up speed, like 10ms, to do the test again ?