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TI-SCB: Maximum EVMs in Series

Choon Seang Tan
Prodigy 20 points
Part Number: TI-SCB
Other Parts Discussed in Thread: INA226EVM,

Tool/software:

In INA226EVM Rev A, the EVM can be supply with external 3.3V instead of 3.3V converted from USB bus.

But in INA226EVM Rev B, external 3.3V no longer an option.

we planned to use 9 EVM, what is the maximum module can be connected in series to the TI-SCB board so that do not overload the 3.3V IC in TI-SCB.

  • 0
    TI__Mastermind 20015 points

    Hello Choon,

    I am actually not sure how many EVMs the TI-SCB could support before the 3.3V is overloaded. That being said, I do have some suggestions to help if you are having issues with 9 EVMs:

    • You could remove LED D1 from each EVM. This would help lower the current draw from each board
      • If you are using the alert feature but don't need the alert LED, then you could remove those also.
    • Though not ideal, you could cut/break the 3.3V pin off of J3 for one of the EVMs and put that EVM closest to the TI-SCB to "disconnect" the 3.3V line from the EVMs. Then connect your own external power supply to the VS test point. (or any VS or 3.3V node). 

    As another side note, if connecting 9 EVMs together, you'll likely want to remove some of the pullup resistors so that the communications lines don't pull up too strongly.

    Regards,

    Mitch