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  • TI Thinks Resolved

TCA9517-Q1: Leakage Current of Side A and Side B

Prodigy 70 points

Replies: 1

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Hello,

we are using side A VCCA (Input) for 3.3v Master Controller and Side B VCCB (Output) for Slave RTC but when we are not communicating or Controller shutdown (3.3V Off ) at that time leakage current through the VCCB is approximately 1.6mA which is quit bigger for our application because we are using super capacitor backup supply for VCCB.

but if we connected controller side to VCCB and Slave side to VCCA and Controller shutdown (3.3V Off )  we got Leakage current of 28uA which is ok for us. but is it ok to connect in this Manner ?? 

  • Hey Jayjit,

    Are you saying that A side is SDA/SCL's pull up resistors are floating while VccA and VccB are powered and enabled? This would be the only way I could reasonably see that there would be mA of leakage current through our device when there isn't communication.

    If I am misinterpreting this, could you please show us a block diagram (pull up resistors tied to what power supplies and such) for me to get a better grasp of the set up. At the moment I don't understand what is powered and what may be floating.

    VccA of our device sets up threshold values for the device and VccB sets up threshold values and also drives the logic, so VccB typically has more current draw.

    -Bobby

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