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AFE031: TSENSE Questions

Brian Angiel
Expert 4370 points

Part Number: AFE031
Other Parts Discussed in Thread: TMP411

Hi team,

What is the signal at the output of TSENSE? Is it voltage, current? How does the output scale with a change in temperature?

Thanks,

Brian Angiel

  • 0
    Guru 140200 points

    Hi Brian,

    TSENSE is just the connection to the anode of a diode which can be used for a die temperature measurement of chip. The cathode of this diode is connected to GND and by the help of an external circuitry you can drive a constant current through this diode while the voltage drop across the diode is a measure of its temperature. It's the classic temperature dependency of the voltage drop across a silicon pn-junction which is used here. Figure 45 of datasheet shows how the TMP411 can be used for the temperature measurement, e.g..

    Kai

  • 0
    TI__Expert 5850 points
    Hello Brian,

    Kai is correct that the TSENSE pin is internally connected to the anode of a temperature-sensing diode located within the PA
    output stage as well as the recommendation for TMP411.

    Best regards,

    Errol Leon
    Texas Instruments
    Precision Amplifier Applications