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BQ76PL455EVM: stacking the bq76pl455 EVMs together

revathi dedeepya kodakandla
Prodigy 180 points
Part Number: BQ76PL455EVM

Hi,

I am working on bq76pl455 EVM. From the user's guide SLUUBA7A of the GUI, it is given we can stack up to 6 EVMs. In my application, I have 20 modules each with 14 cells. My question is should I need 20 EVMs to work with the entire pack? Is there any other solution for that?  In the datasheet, 8.3.2it is mentioned that the devices will respond in sequence, starting at the highest address with the sampled data, then How my main controller will take the highest address because I will make 5 EVMs as one stack (4*5=20 EVMs)and I need to connect that 4 stacks to one main microcontroller. How can this be possible?

Thank you in advance

  • 0
    TI__Genius 17370 points
    Hi Revathi,

    Technically, when stacking in daisy chain you may only stack up to 16 IC's based on the front page of the datasheet. However, it sounds like you are more interested in having a microcontroller local to each module which is considered to be in "multi-drop configuration'. This method is explained in detail in our Use Case Scenarios document here in section 1.7: www.ti.com/.../slua785.pdf . Let us know if you need any clarity on this document.

    Best Regards,

    Taylor
  • 0 in reply to Taylor Vogt
    Prodigy 180 points

    Hi Taylor,

    Thank you for your answer, it really helped me a lot. I have another question so as I said before I have 20 modules now I will connect 16 ICs together with daisy chain connection and remaining 4 as other module and I will connect them(both modules)Multi-Drop Communication With Shared Microcontroller System Architecture, is that correct? How the addressing will be done for both the modules because there are 16 in one module and 4 in another? I have another doubt should I stack EVMs or ICs? If ICs how that IC alone provides passive balancing without any additional circuitry?

    Thanks&Regards

    Revathi

  • 0 in reply to revathi dedeepya kodakandla
    TI__Genius 17370 points
    Hi Revathi,

    Just to be clear, when I use the terminology of stacking IC's this means that you still need to build a board around the IC with the required external circuitry which would include the external FET structure if you want passive balancing. The EVM is an example board layout for evaluation purposes that you may use as reference for your own pcb design that can be tailored to your application.

    The method you have can work, it is up to you to decide which way to go. For addressing the devices, if you have individual local mcus it will handle addressing on its own, if you are using a shared mcu to multiple devices in 'base' configuration, you will have to pre program the devices address or use GPIO addressing.

    Best Regards,

    Taylor