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Shutdown mode and current consumption of TMP112

Joerg Krause
Prodigy 40 points
Other Parts Discussed in Thread: TMP112

Hello TI community,

 

I have a question about the Shutdown mode of the TMP112 and the current consumption in this mode. If I set the Shutdown bit together with the One-Shot bit in the configuration register a conversion starts. The conversion tooks about 26 ms.

The active part consumes about 40 µA as specified in the datasheet. The quiescent current during delay (26 ms) is typical about 2.2 µA.

Now I have noticed the following. If I do not read the temperature register after the delay of 26 ms, the current consumption is still 2.2 µA.

So my question is: Does the sensor goes only in Shutdown mode, after reading the temperature register?

  • 0
    Prodigy 40 points

    I've noticed that the current consumption also goes down to the specified value of 0.5 µA if I read out the configuration register instead of the temperature register.

  • 0
    TI__Mastermind 43725 points

    To answer your question, the device goes into shutdown mode immediately.

    Try waiting longer before taking your current reading. The device consumes additional current (likely the 2.2uA you see) whenever there is communication on the bus.

    Also ensure that you are properly performing a stop at the end of your communication. If the bus is left idle, it will time out after 30ms.