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bq78PL116 with external SMBus, LEDs and EFCI

Elman Efendiyev
Prodigy 80 points
Other Parts Discussed in Thread: BQ78PL116

Hi!

I developing a battery management board which will be attached to external control/monitoring device. I need to connect SMBus, LED and EFCI signals from bq78PL116 to external device by ribbon cable (about 2 meters distance).

Is there any restrictions (capacity/inductance/noise) on external connections for these lines? I believe its OK for SMBus, as log as i follow SMBus spes (am i right or there is special requirements for bq78PL116?), but not sure for LED and EFCI lines (especially LED, because EFCI assumes extenal connection, as i understand).

Are such (external/cable) connections allowed or recommended at all?

Thanks!

  • 0
    TI__Guru 73830 points

    Elman,

    We should not have any restrictions on the external connections on these signals, as long as they are reasonable lengths. If you can share your system requirements, then we may be able to make a better recommendation for a battery controller.

    Regards

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 80 points

    This is a smart battery for light electric vehicles (from e-bike to e-car), basically custom (each battery can have unique sizes, voltages, capacity, using same BMS board).

    Mandatory requirements: active (non-dissipating) balancing, SMBus (for smart dashboards), 7 to at least 16 cells Li-Ion/LiFePO4

    Optional requirements: external MOSFET control, gauge LED/LCD/e-paper (for dumb dashboards)

    Optional requirements which i would be happy to have but can't with bq78PL116 (please correct me if i wrong): more than 16 cells (at least 36, modular/stackable design would be fine), lower cell voltage at least 2V for LiFePO4. AFAIK there is no option for these requirements while active (non-dissipating) balancing balansing is mandatory. Is this true?

    About external connections: could you please "resonability" boundaries for cable lenght? One thing i worry about is EMC from BLDC motor (up to 10kW) close to and powered by this system.