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BQ24250EVM-150: I2C interface

Matthieu Imbert
Intellectual 820 points
Part Number: BQ24250EVM-150
Other Parts Discussed in Thread: BQSTUDIO, BQ25619, BQ25618, BQ25616

Hello,

It looks like bq2425x can't be managed by bqStudio. bq2425x chargers need HPA172 I2C to USB interface - plus the proper driver - to be programmed via a PC.

But HPA172 isn't currently avalaible at TI's online store.

Or is it? Can someone provide me with a link? Is there an upgrade to HPA172, reason why it's no more avalaible?

Please let me know.

Thank you.

Regards.
Matt

  • 0
    TI__Guru*** 143880 points

    Hi Matthieu,

    HPA172 is USB-TO-GPIO box.  The EVM has standalone software that you can download from the EVM tool folder.  The recently released BQ25618 or BQ25619 1.5A chargers with low Iq be a better (and more cost effective) might be a better fit. 

    The link to the box is below:

    Regards,

    Jeff 

  • 0 in reply to Jeff F
    Intellectual 820 points

    Hello Jeff,

    Thank you for your answer.

    I've been having a look at BQ25616 (brand new), but not 25618 nor 25619 yet.

    But I will.

    I was planning to use BQ2425x (standalone) as our application is for removable batteries: the AnyBoot Battery Detection is nice to detect battery insertion/removal. It fits our needs.

    Do BQ25618 or BQ25619 have this kind of feature?

    Thanks for your help.

    Regards.

    Matt.

  • 0 in reply to Jeff F
    Intellectual 820 points

    Hello again,

    I forgot to mention: I'm looking for a standalone 1S Li-Ion/LiPo charger which can detect battery insertion/removal.

    BQ2425x or BQ25616 seem fit. But will the latter one detect battery insertion or removal?

    Thank you.

    Regards.
    Matt

  • 0 in reply to Matthieu Imbert
    TI__Guru*** 143880 points

    Matt,

    For the standalone version like BQ25616 (or any standalone charger), I do not see how it would be able to report battery battery missing even it had a foolproof algorithm, unless the package had another pin.  If charge is enabled, the STAT pin will blink at a predicted rate, as the charger toggles into/out of termination, due to the capacitor at the BAT pin charging/discharging/recharging and repeating.  But the TS fault at thermistor removal will likely be reported at the STAT pin first. 

    Some customers add an electro-mechanical switch that detects when the battery is attached/removed.

    Our latest host controlled chargers do not have a battery insertion/removal feature like BQ2425X because we haven't found a foolproof algorithm (i.e. even though the datasheet says AnyBoot is foolproof, it is not especially if thermistor is removed and triggers TS fault first). The BQ256xx and related families specifically toggle into/output of charge termination at fast rate that can be predicted based on the capacitance at BAT pin, when no battery is connected and charge is enabled.  So, for the host controlled members of the BQ256xx at least, it is not too difficult to write host software to identify battery removal.  Keep in mind that you would need host I2C communication to see BQ2425x AnyBoot detection result.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Intellectual 820 points

    Hello Jeff,

    Thank you.

    Our batteries don't include  a thermistor. So we were planning to wire LDO (REGN) --> 10k --> Ts pin --> 10k --> GND as suggested in DS.

    Best Regards.

    Matt.

  • 0 in reply to Matthieu Imbert
    TI__Guru*** 143880 points

    Hi Matt,

    That works for BQ2425x only.  In standalone mode, how are you going to determine that no battery is attached?  You will still need to use I2C to read the register.

    Regards,

    Jeff