specs Siemens NTC K164/1K5

RL

forgotten - use curve 1011

RL

Thank you.

There 1 problem for me: I need to calculate the temperature, not a resistance. The interface I'm working with, and where the 1.5K NTC is connected to, provides me with a digit from 0 to 1023. Let's say I get the value 484. What would the temperature be then?

Thank you for helping me out.

Huub

You've only got a 10-bit ADC? So calculate the input for every temperature over the range and create a lookup table. It's hardly worth doing the calculations (which involve ln(x)) even if you had the coefficients.

Best regards, Spehro Pefhany

It depends on what the digits represent - how they are generated.

If they represent a recording of resistance, then you need to know what zero and full scale represent, and whether the scale is linear or logarithmic, to interpolate intermediate values.

The Siemens app notes give a formula for converting temp to resistance or vice versa, using material type 'K' values.

Why are you using this part, if it is so unfamiliar to you? Are you just doing homework for school?

RL

It's for a project I'm working on. The interface it suited to be connected with an NTC thermistor, but the analog input itself is converted through a 10 bits AD converter. So, when I probe the temperature, I have to convert the value from the interface into the data I actually want. And yes, it is unfamiliar to me, since I'm a technical informatics engineer, not an applied physics or electronics engineer.