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Can I still use BQ77908A?

Stefan Waltl74
Prodigy 40 points
Other Parts Discussed in Thread: BQ77908A, BQ78350, BQ76930, BQ76940

Hello,


I want to use BQ77908A for battery protection. TI says the device is not recommended for new designs any longer. But BQ77908A would provide all features I'm looking for (protection FET's, automatic cell balancing, I2C interface). What’s the actual reason for not recommending it?


TI suggests using BQ78350 & BQ769x0 instead but the only issue that keeps me from using is the SMBus interface. I would like to use I2C interface for communication between BQ78350 and an Arduino. I’m not sure if SMBus is compatible with I2C without any additional efforts/problems?

Can anyone help me with this issue?

Best

Stefan

  • 0
    Prodigy 40 points

    Hello, Anybody around for this question?

    Thanks a lot

    Stefan

  • 0 in reply to Stefan Waltl74
    TI__Guru 54715 points

    Hi Stefan,

    SMBus has a minimum bus speed and allows clock streching by the slave.  There are other differences described in the SMBus v2.0 specification.. I2C and SMBus compatability is a common question, it seems typically discussed from the perspective of the host.  I expect you should find good references from a search about Arduino.

  • 0 in reply to WM5295
    Prodigy 45 points

    Hi WM5295


    The cell balance function of BQ77908A is an important for battery safety protection. Why Ti does not recommend BQ77908A any more? What reason is behind this change?

    Best regards,


    zhiyong

  • 0 in reply to zhiyong zhang1
    Intellectual 580 points

    Zhiyong,

    We agree that cell balancing is a good feature to have in a battery pack, especially for larger batteries in the 24V - 48V range!

    Please consider instead the new bq76930 and bq76940 AFEs with bq78350 -- you'll find that these offer the best solution in terms of scalability to support different pack sizes (24V, 36V, 48V) and have a rich feature set that maximizes your design impact.

    bq76930 + bq78350 = Full solution for 24V and 36V Li-ion packs

    bq76940 + bq78350 = Full solution for 36V and 48V Li-ion packs

    Thanks

    Allen