TMS320F28377S: RTD sensor interface and DACOUT

Vidhya Jeyapaul said:

1. Can RTD sensors be directly interfaced to ADC input pins of MCU TMS320F28377S with signal conditioning (opamp based) referenced to 3V of VrefHi?

By RTD, I am assuming that you are referring to sensor components like thermistors. If so, then yes the ADC can sense thermistor-controlled voltages that are properly conditioned and buffered into the VREFLO - VREFHI range.

For ambient sensors that are sampled at a relatively slow rate (like 1 per second or slower), an op-amp would probably be overkill for buffering. You can implement a voltage divider that is buffered using a properly sized capacitor in a charge sharing configuration instead of an op-amp.

Vidhya Jeyapaul said:

2. Dacout A,B and C pins of MCU can be used instead of using a DAC IC?

Yes, although care should be taken to not violate the MIN resistive and MAX capacitive load requirements.

Vidhya Jeyapaul said:

3. Humidity sensor same as RTD?

Any sensor can be used as long as its output voltage falls within the VREFLO - VREFHI range and is properly buffered.