• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 65 subscribers
  • Views 101 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ79616: Is the bridge IC BQ79600 mandatory for BQ79616 daisy chain?

Ningguo CAI
Prodigy 80 points
Part Number: BQ79616

Tool/software:

Hi, Experts,

our team is checking how to use BQ79616 for development since the daisy chain of BQ79616 is helpful.

a question came to our mind is the daisy chain bridge BQ79600 is mandatory or not?

Is the below diagram workable? If yes,

     - what is the max BQ79616 quantity for this connection?

     - comapred with this daisy chain plus UART connection, what is the benefit of using bridge BQ79600? speed, robust, other features?

DAISY CHAIN + UART

Full Daisy Chain

  • +1
    TI__Genius 14545 points

    Hello Ningguo,

    Ningguo CAI said:
    a question came to our mind is the daisy chain bridge BQ79600 is mandatory or not?

    1. The daisy chain bridge is not mandatory. Host communication to the BQ79616 device can be connected via the device’s dedicated UART interface or through a communication bridge device, BQ79600.

    Ningguo CAI said:

    Is the below diagram workable? If yes,

         - what is the max BQ79616 quantity for this connection?


    2. Yes, the diagram should be workable. A maximum of 64 bq79616 devices can be connected using daisy chain.

    Ningguo CAI said:
     - comapred with this daisy chain plus UART connection, what is the benefit of using bridge BQ79600? speed, robust, other features?

    3. The BQ79600 bridge device provides galvanic isolation between the low-voltage components and the high voltage battery packs. It also allows you to directly communicate with SPI or UART directly through the bridge device.

    Best Regards,
    Alexis

  • 0 in reply to Alexis_H
    Prodigy 80 points

    thank you very much, Alexis. well understoond your answers.

    just one to be clarified:

    The BQ79600 bridge device provides galvanic isolation between the low-voltage components and the high voltage battery packs

    but an opto-isolation between the lowest BQ79616 and MCU, which can provide same galvanic isolation between low voltage components and high voltage battery packs as well. I guess it's not the main benefit of BQ79600, isn't it?

  • +1 in reply to Ningguo CAI
    TI__Mastermind 41550 points

    Hello Ningguo,

    Yes, an opto-isolator could isolate the BQ79616 from the MCU, however it is still in the same board. The BQ79600 allows the main master system to be completely isolated from the high-voltage boards.

    It additionally has SPI communication and has the added benefit that you can keep your master system separate from the battery modules. Otherwise you may have to have two types of battery modules, one for the upper devices and one that has the BQ79616 and the host MCU.

    If these are not worries or things you care about in your system, you can just use an isolator between the BQ79616 and your MCU.

    Best Regards,

    Luis Hernandez Salomon