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BQ40Z80: technical question

avi hai
Prodigy 40 points
Part Number: BQ40Z80
Other Parts Discussed in Thread: BQ40Z50

Tool/software:

hello,

i would like to use BQ40Z80 as balancer and gas gauge for 2 cell pack.

is there any protection in case of reverse inserted/connected of one or more of the batteries?

Can the battery or the component be damaged in such a case (whether the charger is connected or not connected)?

The data sheets only mention the case of reverse connection of the charger itself.

By the way - in the data sheet section 9.2.2.4.3 it says that Q4 is intended to protect Q3 but according to the drawing on page 26 I think that Q5 protects Q4, am I right?

regards

Avi

  • 0
    TI__Mastermind 28470 points

    Hi Avi,

    I do not believe there is a specific protection for reverse connected cells. If the voltage applied to the voltage sensing pins exceeds the absolute maximum rating, then there can be damage to the device.

    avi hai said:
    By the way - in the data sheet section 9.2.2.4.3 it says that Q4 is intended to protect Q3 but according to the drawing on page 26 I think that Q5 protects Q4, am I right?

    Please allow us to confirm this.

    Regards,

    Anthony

  • 0 in reply to Anthony
    Prodigy 40 points

    Dear Anthony,

    Do you have any idea how to protect if the batteries are inserted upside down?
    Is it possible to get the PCB design files of the EVM card (for ALTIUM) so that I can make a correct editing without mistakes?
    Can you do an experiment on the EVM card and connect one or all the batteries in reverse?

    regards

  • 0 in reply to avi hai
    TI__Mastermind 28470 points

    Hi Avi,

    avi hai said:
    Do you have any idea how to protect if the batteries are inserted upside down?

    I believe a reverse polarity protection circuit could be used, however I do not believe we have any reference designs with this currently implemented and the bq40z80.

    avi hai said:
    Is it possible to get the PCB design files of the EVM card (for ALTIUM) so that I can make a correct editing without mistakes?

    I am not allowed to share these files due to them being internal, however their images can be found within the bq40z50 EVM User's Guide.

    avi hai said:
    Can you do an experiment on the EVM card and connect one or all the batteries in reverse?

    The gauge will not turn on due to no sufficient voltage reaching the BAT pin of the device.

    Regards,

    Anthony