I need help with the circuit.
This are the values of the different thermistors (not all because i can't post more then 2 links):
I have the Adafruit LM4040 voltage reference here but it has only 4.096V.
The ADS7830 datasheet says on page 11:
If a +5V supply is used, an external +5V reference is required in
order to provide full dynamic range for a 0V to +Vdd analog input.
What if i need to read 6V? I guess i need a voltage divider?
Then page 18 the layout:
The GND pin should be connected to a clean ground point. In many
cases, this will be the "analog" ground. Avoid connections that are
too near the grounding point of a microcontroller or digital signal
processor. The ideal layout will include an analog ground plane
dedicated to the converter and associated analog circuitry.
They talk about GND and not COM. Not connecting GND to the supply and voltage reference? Do i link GND and COM?
What about the power for the voltage reference? I already have a dedicated power supply for the relay board to have real isolation. But i guess using it also to power the voltage reference is not a good idea because the relays can cause noise and voltage fluctuation?