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You need to read the LCD data sheet very carefully.
>Pull up resistors? 10k +/-30%?
>Input leakage? +/-20uA
How will this effect the 47K NTC and what ever circuit you add to drive the NTC.
If the NTC (+ resistor or whatever) are on the data lines, can the (micro and LCD) pull the data lines high and low.
Well I am short just 2 adc channels. I guess I can reuse the analog inputs sharing a couple of the data lines once the thermistor doesn't load the line by more than 10K. I was intending to measure the temp by loading each line with a 10K pull up and the 47K thermistor pull down.
Judging from the datasheet:
**broken link removed**
The highest temp of the thermistor should not exceed 65 deg C. Which is ok for my app.
I looked up two 3.3V and two 5V LCD displays and all have +/-1uA of input leakage on the data lines. Most likely the input current is much better than that.
Do you need help to know how much +/-1uA will effect your reading?
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