Hello,
We are experiencing a problem with AD1IN[31]. We are seeing odd voltages measured on this pin. We have a sensor whose output ranges from 0.66V - 3.0V, and we have confirmed the precision of the sensor. When connecting to AD1IN[31], we see a range of 0.25V to ~2.1V, with an extremely noisy signal at the higher end of voltage. When grounding AD1IN[31], it continues to read about 0.25V.
We believe this has to do with the internal temperature sensor. According to the TRM, AD1IN[31] is multiplexed with an on-chip temperature sensor. By following the instructions in the TRM section 6.5.13 we have set the PINMMR in such a way as to disable the temperature sensor and to enable AD1IN[31], however the problem still persists.
Could this problem be due to other factors, such as the Launchpad routing? Or is there an alternative way to disable the temperature sensor?
Thank you,
James