NTC Temperature Sense Resistor Value Calculation

NTC resistance follows the formula

Take the 10k NCP18XH103F03RB as example:

T_R is 25℃, or 298.15 K

R_R is 10k at 25℃

B is 3380K

Thus, we get

r_ntc = 1e5 * pow(3380. * (1. / temperature - 1. / 298.15));

or, to get temperature,

temperature = 3380. / (log(r_ntc / 10000.) + 3380. / 298.15);

Reference Manual