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Temp sensor sensitivity and accuracy

7ACDRIVER
Intellectual 400 points

Are there any TI discussion papers on temp sensing sensitivity - i.e. reaction and stabilizing time .vs. packaging and electrical characterisitcs. For example, what volume of air at del-t is necessary to nudge the reading? For a given product, are there curves for air volume @ del-t .vs. time. Does this need to be humidity compensated? Does it need to be radiation compensated?, supply voltage compensated?

How stable are the MSP430 built in temp sensors .vs. processor usage? I would expect to see a stable reading at low % utilization with a knee at some % point with an  error as function of % utilization. 

My goal is to use an MSP430 in low power mode with or without an external sensor to achieve a nominal .25F sensitivity over 0-100F range with max .25F del-t detection time of less than 1 minute. In some circumstances I will have RH available, but others normally not. The product package design is an important, but secondary consideration. 

What is the consensus? 

 

 

  • 0
    TI__Mastermind 22447 points

    This isn’t a direct answer to your question but it may help:

     

    1. IC temperature sensors tend to track the temperature of the PCB they are attached to. 
    2. If you want to track fast moving air temperature changes, you should probably consider an external temperature sensor in the air path (i.e. thermistor, RTD, thermocouple).
    3. The error curves in the temp sensor data sheets are a good guideline as to the absolute accuracy of the temp sensor.   The best accuracy is 0.5C.  Accuracy of built in temperature sensors will not be this good, however, if you calibrate this will not be an issue.