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Original question:

TAS2505-Q1: Question about I2C pull-up resistor value

TAS2505-Q1: Question about output low level current of TAS2505-Q1 SDA and SCL

?? ??
Prodigy 20 points

Part Number: TAS2505-Q1

Tool/software:

HI!

I'd like to use pull-up resistor of TAS2505-Q1 SDA and SCL with 1.5 kΩ.

I could not find output low level current (IOL) of SDA and SCL in the data sheet. Is it possible to set 1.5 kΩ?


Please let me know if you have the data of maximum output low level current (IOL) for TAS2505-Q1 SDA and SCL.

Thanks!

  • +1
    TI__Guru 57200 points

    Hi

     Usually suggest to use 10K pull up, and I/O current smaller than 1mA.

    ?? ?? said:
    data of maximum output low level current (IOL) for TAS2505-Q1 SDA and SCL.

    The maximum current could be considered as 10mA, but will have obvious voltage rise, only guarantee to be smaller than 30% DVDD.

  • 0 in reply to Shadow He
    Prodigy 20 points

    Thank you
    I have 2 additional questions.

    ・The reference design in the datasheet recommends 2.7 kΩ for SCL and SDA pull-up resistors.
    I would like to set the pull-up resistor smaller than the reference design, but is there a possibility of port damage by setting 1.5 kΩ?

    ・I would like to use IOVDD: 3.3 V and pull-up resistor: 1.5 kΩ. IOL= about 2.2 mA. Is there a problem?

  • +1 in reply to ?? ??
    TI__Guru 57200 points

    Hi

      Not likely to have damage, just not suggested for higher power loss.