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Original question:

DC_Analysis_query_TMUX1308-Q1

DC_Analysis_query_TCA9803DGK

Mari Priyadharshini K
Prodigy 180 points


Hi TI Team,

We are using this TCA9803DGK IC in our design and we need the input current details for the SDA/SCL pin of this IC.

Part Number VOH VOL VIH VIL IOH IOL IIH IIL
TCA9803DGK Already have Already have Already have Already have Need Data Already have Need Data Need Data

  • 0
    TI__Mastermind 49568 points

    Mari,

    Calculating the current in/out on the A-side and B-side will vary.

    B-side is much simpler to understand since the current when driving a LOW signal from A-to-B side will be the ~Ics current. Since you are using the 9803, this is around 3.3mA of driving force. When the signal is HIGH (i.e. A-side is idle, so B-side is idle, ICS current source off) then the current out of the B-side should be close to the input leakage current specified in the datasheet for the SDAB and SCLB pins, which is +/- 10uA. 

    When a I2C device is driving LOW on the A-side, the current in to the pin will be dependent on the drive strength of the I2C device and the pull-up resistance on the SDAA/SCLA bus. Please see this app note on how to calculate the value of this resistance here. When the bus is idle (B-side is idle, therefore a HIGH is propagated from B-side to A-side), then the current should be close to the input leakage current spec in the datasheet which is again typical value of +/- 10uA.

    Please let me know if this answers your question.

    Regards,

    Tyler