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bq5105x Charger sleep and wakeup

PAN-M
Mastermind 8375 points
Other Parts Discussed in Thread: BQ51050B

Dear all.

In the bq5105x, if there isn't battery or charge full, does power transmission from TX off?

Regards,
PAN-M

  • 0
    TI__Genius 14890 points

    PAN-M,

    When charge is complete on the bq5105xB, the RX will send the TX an end of charge signal and the TX will stop power transfer.  

    There are two different approaches the TX can take.  The TX will continue to check to see if the RX has been removed by sending a "ping" every 400ms-500ms.

     If the ping is "analog", the TX is checking to see if the RX has been removed yet.  It will continue to send this ping until it senses the RX has been removed.  Once removed, it will still send the pings waiting for another RX to be placed on the system.  Then, it will power up that system as a new system.

    If the pin is "digital", there is enough power transferred to turn on the RX.  In this case, the bq5105xB will respond with another end of charge signal.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Mastermind 8375 points

    Dick-san

    If charge is needed again, does bq5105x start charge automatically?
    Once, is it necessary to remove RX?

    If TS/CTRL = 1 is used, a charge complete message will be transmitted.
    Is it necessary to supervise a \CHG signal by a host and to control TS/CTRL by a CPU?

    Regards,
    PAN-M

  • 0 in reply to PAN-M
    TI__Genius 14890 points

    PAN-M,

    The bq5105xB continues to monitor the voltage at the BAT pin.  If the BAT pin decreases enough, a recharge will begin at the next "ping".

    The system does not need to monitor the /CHG pin unless it would like to respond.  In many applications, it's used with an LED for an indicator.  

    A 10 k-Ohm resistor should be tied from TS/CTRL to ground if it will not be used to monitor temperature (TS function).  If the CTRL function is not used, no action is required (as long as the 10 k-Ohm resistor is present).

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Mastermind 8375 points

    Dick-san

    In charge end, TX power off, does the IC in this case worked by BAT power?
    Does IC work to UVLO voltage?

    Regards,
    PAN-M

  • 0 in reply to PAN-M
    TI__Genius 14890 points

    PAN-M,

    The IC is never powered from the battery, only from the AC1/AC2 lines.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Mastermind 8375 points

    Dick-san

    Please tell me to a slight degree.
    After charge end of battery, the power supply from TX is stopped.
    In this case, there is no power supply(AC1/AC2) of bq5105x.
    How does the bq5105x perform re-charge?

    Possibly, must RX once be removed?

    1) Charge end->TX off->ping->RX on->Battery full(or recharge)->TX off->(continue)
    2) Charge end->TX off->RX Remove->RX on->ping->Battery full(or recharge)->(recherge battery full)->TX off
    When RX is always on TX, we expect 1.

    Regards,
    PAN-M

  • 0 in reply to PAN-M
    TI__Genius 14890 points

    PAN-M,

    The transmitter will go into a lower power mode.   There are several methods of how the transmitter will respond when in sleep mode.  But, what they all have in common is that they will periodically power up the RX.  It could be every 500 ms or 5 seconds or something else.  When the bq51050B is powered up, it will monitor the BAT voltage and, if the battery is low enough, it will initiate a charge cycle again.

    Leaving the bq51050B on the TX will allow the battery to be monitored and recharged as needed.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Mastermind 8375 points

    I understood completely.

    Thanks
    PAN-M