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TMP451: Remote Temperature Error vs Leakage Resistance

Shen Lemon
Prodigy 40 points
Part Number: TMP451

Hi,

   I want ti know how does the Leakage Resistance affect the measurement temperature?

   From the Figure 4. Remote Temperature Error vs Leakage Resistance, I know:The smaller the leakage resistance, the smaller the error. But how it to do?

  • 0
    TI__Mastermind 35895 points
    Hi Shen,

    The TMP451 sources very small currents which excite the remote junction (diode.) The voltage of the diode is sampled by the internal ADC, and used to calculate temperature.

    Figure 4 represents error due to a portion of the current taking a separate path to GND or V+. It means that some of the current which is intended to excite the remote junction is lost.

    Thanks,
    Ren