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BQ51013B Charge Complete

Tom Congdon
Prodigy 75 points
Other Parts Discussed in Thread: BQ500212A, BQ51013, BQ51013B, BQ500210

I'm using the bq51013B chip with a WR303050-15F5-G charging coil from TDK and followed the bq51013EVM schematic precisely.  I am also using PN: bq500212A on the TX inductive side.  Charging occurs without issue but the problem that I am having is that the Charge Complete signal does not seem to get transmitted to the TX coil once charging is done.  I can clearly see the current to the battery drop to 0 yet the TX chip continues to stay in Power Transfer mode.  How does the bq51013 chip determine Charge Complete and are there specific settings or COMMx capacitor values (currently using 22nF for each)  that need to be set to enable communication between the chips?

Best, 

Tom

  • 0
    TI__Genius 14890 points

    Tom,

    The bq51013B does not send a charge complete signal directly.  It only supplies the power to the charger.  \

    The bq51013B datasheet will be updated shortly and will update table 4.  The best way to send a "Charge Complete" signal to the transmitter is by taking EN1=EN2 = high.  This will send the proper signal to the standby state.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 75 points
    Dick,

    Thanks for the response. However, sending a signal from the bq51013B chip to go into standby rather than signalling that charge is complete does not help me for my application. The reason being that I want to differentiate from a device being fully charged but still on the charging pad from the removal of the device from the charging pad. By sending a signal to put the transmitter in standby mode after Charge Complete gives the same signal as removing the device from the charging pad. If the bq51013B chip is not capable of sending a Charge Complete signal, can you recommend a different TI chip that can?


    Best,

    Tom
  • 0 in reply to Tom Congdon
    TI__Genius 14890 points

    Tom,

    Sorry for not being clear.  The signal sent from the bq51013B when EN1=EN2=high, is "Charge Complete" (CC).  The charge complete will allow the transmitter to continually "ping" the bq51013B.  In this case, the bq51013B will power up and if EN1 and EN2 are still high, will send another CC.  The OUT pin of the bq51013B will remain off until the EN1 and EN2 pins are returned low.

    If the battery charger notes that the battery is below the "recharge threshold" then the controller would take EN1 and EN2 low again and the bq51013B would not send the CC, and OUT would be energized allowing a recharge to begin.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Intellectual 420 points
    Using the BQ51013 in a portable device, and the BQ500210 in the charger. It seems that once we set EN1/EN2 high on the BQ51013 to terminate charging, the chip never re-enables charging even with EN1/EN2 low again, as you describe above. What are we missing?
  • 0 in reply to Steve Hendrix
    TI__Genius 14890 points
    Steve,
    Sorry for the late response. When the bq500210 receives a charge complete packet, it will "halt power transfer for 5 minutes." Please see section "ADVANCED CHARGE INDICATION SCHEMES" in the bq500210 datasheet. Let me know if this is the issue you are seeing.
    Regards,
    Dick
  • 0 in reply to Dick Stacey
    Intellectual 420 points

    Thank you for hte response. I've been over the datasheet and all the appnotes so many times, I don't see how I missed that section. That is precisely what we need, and addresses several related issues at the same time. Thanks!