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Original question:

LM5069: Design for Hot swap two batteries

TCA9511A: Hot swap function for two batteries with I2C interface.

Jesse Chang
Prodigy 100 points
Part Number: TCA9511A

Tool/software:

Dear Sir, 

As below block diagram, we need the hot swap function for two batteries with I2C interface. 

1. Is I2C Buffer TCA9511A necessary?

  • 0
    Guru 317370 points

    The TCA9511 isolates the how-swapped bus from the rest of the bus to allow communication between the remaining devices to contiue. If the only devices on a single bus are the charging IC and the batttery, then you do not need this isolation.

  • 0
    TI__Mastermind 48308 points

    Hi Jesse,

    As Clemens mentioned already, TCA9511A separates the "IN" and "OUT" sides in a hot-swap event. TCA9511A would be useful here if the Battery#1 and #2 modules are being hot-plugged into the system. Otherwise, TCA9511A is not needed here. 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    Prodigy 100 points

    Thanks. I want to confirm if my understanding is right. 

    When hot-plugged event happen, if I need the whole I2C communication between charging IC and battery to get correct data, then TCA9511A would be useful. If I don't care the  I2C communication when hot-plugged, TCA9511A is not needed .

    Is my understanding right? Thanks.

  • 0 in reply to Jesse Chang
    TI__Mastermind 48308 points

    Hi Jesse,

    Jesse Chang said:
    When hot-plugged event happen, if I need the whole I2C communication between charging IC and battery to get correct data, then TCA9511A would be useful.

    TCA9511A would help to prevent a stuck bus condition due to a hot-plug event. If TCA9511A is not used, and a stuck bus event occurs due to hot plugging, then the I2C target devices connected to the bus would need to be reset. 

    Jesse Chang said:
    If I don't care the  I2C communication when hot-plugged, TCA9511A is not needed .

    Yes this is true. IF you run into a hot-plug event that causes a stuck bus condition, then you would need to reset the state machines of each target device / controller device on the bus. 

    See I2C Stuck Bus Prevention and Workarounds

    Regards,

    Tyler