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EM1402EVM: ADMINISTRATION

Noel Diaz
Prodigy 80 points
Part Number: EM1402EVM
Other Parts Discussed in Thread: BQ76PL455A-Q1, EMB1428Q, EMB1499Q

Hi I'm inquiring about the evaluation module. Right now I am working with the EM1402EVM  series. We are working with 15s and 10p, the power supply is connected at 12v 3.5 amps. and at this point everything is working fine. We're seeking a simple method to activate the BMS. Right now the bq76PL455 GOI does not enable the BMS, making it possible to balance the batteries. Let me know what I can do, thank you. 

Noel 

  • 0
    TI__Genius 11480 points
    Hi Noel,
    Could you detail how you are interfacing to the board? Are you using a bridgeboard, or connecting directly with an MCU?

    How many modules (if any) are you stacking?

    On the EM1402, you would wake the PL455 just as you normally would with the pl455 evm (you can find how to do this in the datasheet).
    For the EMB1428/EMB1499, you need a SPI interface (provided on the board). Alternatively, you can use the PL455 GPIO to bitbang SPI to communicate to the EMB chipset.

    If you are only using one board, the wake pulse should be enough to wake the pl455.
  • 0 in reply to David Wiest Jr
    Prodigy 80 points

    Hi David, 

    We are connected directly with the MCU, and only stacking one. Ok, I'm using one board, and the pl455 is waking up correctly. 

    In the balance section of the pl455, can this software stand alone, and control the balancing section for one board EM1402EVM? In other words, can I handle the system individually by choosing which cell I wish to balance, without having to invest in additional parts? I ask because right now I use, bq76PL455A-Q1 16 Cell battery Monitor with passive cell balancing evaluation module. 

    I appreciate your response. 

    Noel

  • 0 in reply to Noel Diaz
    TI__Genius 11480 points

    Noel,

    On the EM1402 board, the pl455 acts only as the monitor. Active balancing is handled by the EMB1428Q (switch matrix) and the EMB1499Q (isolated + bidirectional dc-dc).

    The EMB1428 data sheet has information on the SPI commands to send to connect the switch matrix: www.ti.com/.../emb1428q.pdf

    and the EMB1499 datasheet is also a good reference: http://www.ti.com/.../emb1499q.pdf

    Also, please make sure the switchon the board is set to single if you are using only one board. 

  • 0 in reply to David Wiest Jr
    Prodigy 80 points

    Hi,

    I'm trying to make a connection between the EM1402EVM and the TMS570. 

    On the EM1402 I am having difficulty making the connection with the J2 (stated on the board itself) and stated as J6-1 on the instruction sheet. In understanding that the J2 is the correct connection to the launchpad then what would be the correct pattern of the 8 pins? In what order would the pins read?

    Thank you.  Noel 

  • 0 in reply to Noel Diaz
    TI__Genius 11480 points

    Hi Noel,

    Hopefully this image helps, if i am understanding correctly.