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TCA9617B: Power Consumption with Lines pulled low

Russell Wetherley1
Expert 4255 points
Part Number: TCA9617B


I'm looking for some clarification on power consumption using the TCA9617BDGKR.

 The datasheet indicates that Iccb could be up to 8.1mA when both channels are low. But is there a standby current for when the enable is LOW (output disabled)? I'm guessing that would be the +7mA?

I'm looking at the Iccb lines on page 5 of the ds.

Russell

  • 0
    TI__Guru* 77381 points

    Hey Russel,

    The Iccb spec which states the current would be +7mA refers to when the SDA/SCL lines are not being controlled/pulled low by a master or slave but when it's in its idle condition. The worst case occurs when we have to drive a side low (5.7mA typical and 8.1mA max).  That is not when EN is low.

    When EN is low, the drivers to pull the SDA/SCL lines high or low are turned off. I suspect that when you set EN to low, the Iccb will be in the uA range but it will depend on how large the internal pull up resistor is.

    Is this data you need? If so I will have to order a device and do testing in the lab to try to measure this.

    Thanks,

    -Bobby