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TMP114: about power consumption

Lawrence He
Genius 3105 points
Part Number: TMP114
Other Parts Discussed in Thread: TMP112D

Tool/software:

Hi, Support Team

We are design in TMP114. For power consumption reduction, we would add 4.7k ohm pull-up resistors with 1.8V power supply.
Is it possible for TMP114?

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

  • 0
    TI__Expert 7170 points

    Hi Lawrence,

    Having a 4.7k ohm pullup would be ok with this device. Keep in mind the input capacitance spec for the digital pins which is 10pF at 100kHz. A weaker pullup will have a lower maximum frequency for the communication lines due to input and parasitic capacitance. Just something to note if you want to use a higher pullup to run at high I2C frequencies.

    Best regards,

    Simon Rojas

  • 0 in reply to Simon Rojas Avila
    Genius 3105 points

    Hi, Simon

    Thanks for reply.

    There should three parameters to determine the maximum pull-high resistors: Cb, Rp, Tr

    Tr is related to the I2C driving frequency, the max frequency of TMP114 is 1MHz, it’s same as TMP112D.

    So I think it could have the same pull-high resistors of TMP112D, like below. Is that right?

    if any suggestion, Please advise me.

    Thanks,

    Best regards,

    Lawrence

  • 0 in reply to Lawrence He
    TI__Expert 7170 points

    Hi Lawrence,

    Yes, the higher the frequency and the parasitic capacitance, the smaller the max pullup resistance is. Assuming your maximum parasitic capacitance is the 10pF, yes 5k or 4.7k ohms is ok.

    Best regards,

    Simon Rojas