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TMP302B / toggle TRIPSET pins dynamically

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: TMP302

Hi Team,

My customer considers to use TMP302B and toggle TRIPSET pins dynamically for his test purpose.
The test procedure he assumed is the following.

1) set TRIPSET0=L, TRIPSET=L (trip point: 70℃)
2) set ambient temparature Ta=78℃
3) power on TMP302B and confirm OUT pin shows "L"
4) toggle TRIPSET0=H, TRIPSET1=H (trip point:85℃)

[question-1]
After above procedure, I believe OUT pin goes "H" regardless of HYSTSET pins because "85℃ > 78℃(=Ta)".
Is my understanding correct?

[question-2]
How long is the response time when toggle TRIPSET pins dynamically?
is it also required 35ms as the datasheet page.12?
http://www.tij.co.jp/jp/lit/ds/symlink/tmp302.pdf

Best Regards,
Yaita / Japan disty

  • 0
    TI__Mastermind 34250 points

    Hi Yaita,

     

    (1)     Correct. Since ambient temperature was kept above trip point all the time. OUT pin will keep its tripped state. Only if the ambient temperature drops below trip point plus hysteresis, the OUT pin resets (to HIGH).

    (2)     In general you are correct to assume a 35mS response time. This is the time it takes for TMP302 to finish a conversion, therefore “sees” the change in temperature. However it is based on the assumption that TMP302 chip has reached thermal equilibrium, ie, chip internal temperature is the same as the ambient temperature. If there is a sudden change in ambient temperature, it will take significantly longer, usually seconds, for thermal equilibrium to be established.

    Regards

    Guang-Apps Sensing Products