I am using a micro controller (TI CC3220 - http://www.ti.com/lit/ds/symlink/cc3220.pdf) which uses 3.3VDC for its operation and has an ADC input range of 1.4VDC.
- In order to use the ADC input for reading values from a variable resistor, can I just use a simple resistor divider to step down the voltage from 3.3VDC to 1.4VDC?
- How do I find the appropriate resistor values R1 and R2 for the divider ? I have tried 47K & 22K and they seems to work fine, but not sure about their long term impact.
Note : I do have constraints on the component size and cost, hence would request the cheapest feasible option here.