I am trying to connect an analog temperature sensor LMT84 (http://www.ti.com/product/lmt84) to a micro controller (3.3VDC) using its ADC pin which is 1.4V tolerant (max). My Vcc is 3.3V, ADC max input is 1.4V and temperature IC minimum voltage is 1.5V. Two options I could think of is, either to place a voltage divider at the input of temperature IC source or at the output of temperature IC. Schematics shown below
Option 1 Schematic
Option 2 Schematic
Can someone please help me with choosing the correct schematic (considering the pros and cons) and calculate the resistance values of R1 and R2 (internal input impedance of the Microcontroller ADC is high i.e 200K approx).