The LTC6811-1 datasheet mentions the following:
VREF2: Buffered 2nd Reference Voltage for Driving Multiple
10k Thermistors. Bypass with an external 1µF capacitor.
VREF1: ADC Reference Voltage. Bypass with an external
1µF capacitor. No DC loads allowed.
So, it stands to reason that Vref2 must be used as supply voltage for the external 10k NTC thermistor network for temperature reading.
In our self-designed PCB, after receiving the PCBs, we noticed that instead of using Vref2 as the supply for the thermistor, Vref1 was used.
My questions are:
1. How many thermistors can be supplied through Vref1, if at all?
2. Will this cause damage to the LTC6811-1 IC, if we continue to use the Vref1 as the supply voltage for the thermistor network?
3. Is this a significant enough of a problem that we should cut the track from Vref1 and put in a jumper to Vref2?