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Dear Sir/Madam,
We have built a custom board using ADS114S06BIPBS to read PT1000 sensors. But we are having issues with SPI communication. The signal line from the MCU to ADS114S06 looks good, we can see the messages we send on oscilloscope but we cannot read back or see any response on the SPI line. We were not able to read any registers. It seems like the IC is dead (tried it on 4 different boards)... We have attached our schematic for reference... Can you please help what may be the issue? Also is there any way we can understand that the IC is not dead, cannot see anything from the REFOUT pin also. Thanks!
Hi Berkay,
To see a voltage on REFOUT, you need to make a register write to turn on the internal reference as the default condition is the internal reference turned off. The most common issues seen when first attempting to communicate to the ADS114S08B is a missing supply (AVDD, DVDD and IOVDD must all be at nominal operating voltage), or the RESET pin is not pulled high.
Another possibility is the wrong clock polarity or phase for the SPI clock is used. The SPI clock should dwell low and MOSI should change state on the rising edge of SCLK and hold steady on the falling edge. If CS is used, then CS must stay low throughout the entire communication transaction and must not toggle between transmitted bytes. If you have scope or logic analyzer shots of the communication you can share it would be helpful to review to further help with troubleshooting.
Best regards,
Bob B