This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

RF430FRL152H: Internal Temperature reading when using own PCB board

Part Number: RF430FRL152H

Hello TI,

I made my own PCB board and succeeded to design ADC reading device for research purpose. I know there are three ADC pins that RF430FRL152H can read but now I would like to read the internal temperature the chip by itself has. My question is:

In order to read the internal temperature using my own PCB, should I create a circuit with reference resistor and thermistor like the TI temperature patch? or, all I just need is the RF430FRL152H chip and an appropriate software without any external circuit connected to ADC pins?

I read this forum: https://e2e.ti.com/support/wireless-connectivity/other-wireless/f/667/p/561021/2054493#2054493 but did not fully understand how to read the internal temperature using the chip. Could you please kindly explain each steps how I can use the internal temperature sensor? I know how to measure the temperature by using voltage divider with external reference and NTC resistor but I believe the internal temperature reading would require less power.

Thank you very much!

  • Hello,

    when you want to use the internal temp sensor, then the external circuitry for the ADC is not needed. The drawback is, that this sensor needs calibration. That is what is explained in the thread you have referred to.

    When using the external thermistor, calibration is not necessary. In case of power, the thermistor just needs 2.5uA of current.

    Are you using the ROM firmware of the RF430FRL152H or are you writing your own code?

    If using the ROM firmware you will find a description of all the virtual setup register to configure the sensors and the measurement in the following document:

    http://www.ti.com/lit/ug/slau603b/slau603b.pdf

    Best regards,

    Helfried