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TMP006 voltages

Ian Patterson
Prodigy 50 points

Other Parts Discussed in Thread: TMP006, TXB0102, TXB0104

Hello,

 I haven't seen this discussed in the forum. My question is: can I run the TMP006 V+ at 3.3VDC but use pull-up resistors (say, 47k) to 5VDC for SDA and SCL? A related Question is Can I do the same for ADR0 and ADR1? I assume that the reason that TI seems to prefer 3.3VDC for V+ is to minimize self-heating of the chip. Is this correct?

Thanks for your attention to this topic.

  • 0
    TI__Mastermind 27715 points

    Hello Ian,

    Powering the TMP006 with +3.3V and using pull-ups to +5V is not a problem for the SDA, SCL, and ADR0 pins, as the process on which the TMP006 was designed can tolerate DC voltages of up to +7V. However, the ADR1 pin has an internal connection to VS, so its voltage must not exceed (VS + 0.5V) per the Absolute Maximum ratings table on p.4 of the data sheet. 

    We prefer +3.3V for VS as it's the supply voltage used for the majority of our characterization so we simply have more data and experience with the part at that setting. However, you are correct that at +5V supply, self-heating and other factors cause offset voltages to develop which can impact overall accuracy.

    In short, it's best to use a +3.3V supply rail and to use pull-ups to +3.3V as well.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Linear and Sensing Products 

  • 0 in reply to Ian Williams
    Prodigy 50 points

    Thank you Ian,

     You did indeed answer my question - my apologies to the Forum for my tardiness in verifying the answer and my thanks to you for doing it for me.

    This "reply" is more of a footnote to my question and your answer. Texas Instruments makes a neat I2C bidirectional level translator that precisely tackles the pullup quandry of SDA-SCL at 5V from a microcontroller and operating the TM006 at 3.3V (preferred). This device is the TSX0102 (or it's cousins TXB0102, TXB0104).

    Regards,

    Ian Patterson