Circuit for Vout of thermometer to ADC input (help a newbie)

[k6116]

Hi everyone, I am extremely new to using microcontrollers and I have been working on a simple temperature sensor project. I was just wondering what is the best way to connect the Vout of the analog temperature sensor to the ADC input port? At first I was thinking just a simple 10k resistor between the Vout and the ADC input to protect the input from damage, but someone told me it isn't such a simple circuit. The temp sensor will output a voltage range from 0V-3V. The ADC has a max input of 3.3V.

In case you are curious, my microcontroller will only turn on for 1 second every 1 minute to log the temperature data, then go to sleep for the other 59 seconds. Please give me suggestions for the circuit design. Thanks!

 

[Nigel Goodwin]

Perhaps you should mention what sensor you're using?.

 

[k6116]

Well, I think eventually I will use the Precon HS-2000V
**broken link removed**

But I thought the circuitry would be similar to a LM94023
**broken link removed**

If there is just a general circuit schematic that is applied, I just want to know what that would look like.

 

[Nigel Goodwin]

You just need a direct conection to the A2D pin, if you want to make extra sure use a resistors, 1K to 2K, something like that. But it only makes a difference if you accidently set the pin to be an output rather than an input.