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BQ500210 LED indication scheme

Matt Ragusa
Prodigy 65 points
Other Parts Discussed in Thread: BQ51013, BQ500210, BQ500212A, BQ500412

Hello.

I am using the BQ500210 along with the BQ51013 and am having the exact same issues as described in the thread post pasted below in italics. 

Once placing the TX coil on the RX coil, the LED1 of the BQ500210 blinks slowly and charging of our battery begins.  Once charging has completed, I drive the TS/CTRL line high through a p-type mosfet in order to terminate power transfer, which causes the LED to turn solid green.  This is the behavior that we expect and want, however after some time period after, the LED turns off with no indication of fault or other error. 

I too would be interested in any ways of making LED1 remain on or begin flashing slowly once charging is re-initiated.

Thank you,

Matt

Hello,

I am working on a design which has recently made the change from the BQ500110 to the BQ500210. Everything seems to be working fine except for some unexpected behavior that I'm seeing on the LED indicators (specifically LED1 on theBQ500210). I am using the BQ51013 on the receiver side.

When I place the RX coil on the TX coil, LED1 begins to slowly flash green indicating power transfer. When I force the BQ51013 to terminate the transfer (by pulling TS/CTRL high) then I see LED1 turn solid green.

Then, if I stop forcing the TS/CTRL pin on the BQ51013 high and wait 5 minutes - the power transfer will start again but LED1 turns off and remains off instead of flashing. Once I send another termination packet from the BQ51013 the power transfer will stop and LED1 will turn solid green again.

I have tried LED modes 1, 3, 4 and 5 and they all show the same behavior.

Is there anyway to make LED1 not turn off (it can either remain solid or slowly flash) if a power transfer is re-initiated after a termination packet has been sent?

Any help or information would be greatly appreciated.

  • 0
    TI__Guru* 75906 points

    My apologies for the delay in getting to your question.

    When TS/CTRL is driven high—RX will send End Power Transfer Packet 01 (EPT01), Charge Complete.  When the bq500210 receives this packet it will stop power transfer and green LED will change from blinking slowly (power transfer) to solid green (charge complete).

    During this time the TX will use analog ping every 500mS to check if the RX has been removed and another unit placed on the pad.  Every 5 min the TX will send a Digital ping to power the RX and check its status.  Analog ping during this time will only check if the RX has moved, looking for a change in COMM amplitude of 10%.

    When Digital ping is sent every 5 min the RX will typical respond by sending EPT01 as the first packet.  The transmitter responds by stopping power transfer and returning to the above state.

    ---Re-start charge after EPT01--If the RX has been on the charging pad after sending EPT01 and releases the TS/CTRL pin.  When TX sends the Digital Ping it will now go into power transfer mode and charge will restart.  But Buzzer will not beep---by design to reduce noise late at night.  Also the LED will be out during this time also.

     I think this last condition is the one that is causing you difficulty with.  An external application circuit may be possible depending on your requirements and flexibility. This can be discussed offline, I will contact you.

    Note the bq500210 is a WPC1.0 device that does not support FOD and WPC1.1.  Parts that I would recommend are the bq500212A (5V) and bq500412 (12V).

  • 0 in reply to Bill Johns
    Intellectual 420 points

    I'm not sure I fuly understood your answer. As I read it, if the portable unit remains in place but changes state to now request charging after previously sending EPT, it can take up to 5 minutes for the charger to recognize the change, and even then, the LED will not indicate charging. Both of those aspects are serious problems for user perception. Did I understand correctly?

    Unit is charging.
    Full charge achieved, unit signals EPT.
    Charger turns off LED and stops charging.
    ....Time Passes.....
    Battery discharges to a threshold to restart charging.
    Unit takes the TS/CTRL pin high to request power.
    Depending on where we are in the 5 min cycle, the charger waits up to 5 min.
    Charger recognizes the request and resumes charging, but with LED off. (?!?!?)