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BQ24003 Charge Timer Resume vs Restart

Lindon Baker
Prodigy 120 points
Other Parts Discussed in Thread: BQ24003

My client has repurposed the APG/THERM pin on BQ24003 to detect portable device present or absent from the charger base.  The lithium cell is in the portable device, and the BQ24003 in the charger base.   When the portable device is present, a resistor satisfies the temperature range and the charger runs.  When the portable device is removed, the temperature looks invalid, and charger suspends.  I cannot determine from the data sheet if replacing the portable device will simply bring the charger out of suspend and resume the timer from where it left off, or if there are conditions which will restart the charge timer as charging resumes.  Can anyone state simply when charging and timer resume, and when charging resumes and the timer restarts.

  • 0
    TI__Guru**** 166576 points

    At the top of the second column on pages 14 and 16, the datasheet says that the IC suspends the timer if APG/THERM is outside the limits set by the user.  The flowchart on page 13 says that toggling APG/THERM  is equivalent to POR and EN toggle, which resets the timer and starts a new charge cycle.  I will order an EVM and test to confirm both the above and determine what voltage levels constitute toggling.

  • 0
    TI__Mastermind 20570 points

    Hello Lindon,

    When the voltage on the APG/THERM pin is out of range (around 0.55 to 1.5V), it will reset the timer on bq24003.

    Regards,

    -Jing