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AM2612: relationship between VDD_TEMP and on-chip temperature sensors

Fan_Zhang
Expert 4270 points
Part Number: AM2612

Tool/software:

Hi, experts,

In AM2612 datasheet, it is mentioned "If the internal temp diode is being used this pin must be connected to the 1.2V/1.25V power rail. If the internal temp diode is not being used this pin can be connected (shorted) directly to ground (VSS)."

In AM2612 TRM, it is mentioned "The TM module on the device enables thermal management of the device by providing control of on-chip temperature sensors."

Customer wants to confirm whether the "" and "" are the same or different components. If VDD_TEMP is connected directly to ground, can TSENSE0 and TSENSE1 work normally?

Thanks.

  • 0
    TI__Expert 5040 points

    Hello,

    The internal temperature diode and the temperature sensors are technically different components, but for the best accuracy it is recommended you connect VDD_TEMP to the VDD power rail if you wish to use the temperature sensors.

    Regards,

    Susan

  • 0 in reply to Susan Moore
    TI__Expert 4270 points

    Hi, Susan,

    What is internal temperature diode used for? What is the relationship between temperature diode and temperature sensor? Why need to connect VDD_TEMP to the VDD power rail for best accuracy on temperature sensors? How about the accuracy of temperature sensors with and without VDD_TEMP to the VDD power rail?

    Thanks.

  • 0 in reply to Fan_Zhang
    TI__Expert 5040 points

    Hello,

    I am reaching out to see if I can find more information on why, but after speaking with my team, the consensus is that in order to use the internal temperature sensors, VDD_TEMP needs to be connected to the 1.2V/1.25V power rail. 

    As such, my recommendation would be to connect VDD_TEMP to the 1.2V/1.25V power rail if you plan on using the internal temperature sensors.

    Regards,
    Susan