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BQ25703A: Way to detect when Quick Charge is finished

user5237784
Prodigy 500 points
Part Number: BQ25703A

Hello Specialists,

My customer is using BQ25703A and we have a questions regarding how to know when Quick charge is finished.

Originally, we were going to judge Quick Charge is over when IN_PCHRG bit of register 21h reach 0.

However, when we were checking the real action, we set battery voltage by register 04h/05h.

When voltage reach MaxChargeVoltage and no charging current is flowing, IN_PCHRG still did not change to 0.

Can you please kindly help support how to detect when Quick Charge is finished?

Thank you.

HsinYu Lin

  • 0
    TI__Expert 3320 points

    Hi HsinYu:
        

        IN_PCHRG is the bit we use to report pre-charge status. I believe you are referring to fast charge status, therefore IN_FCHRG is the bit you should monitor.

        I assume the reason you want to monitor IN_FCHRG, because you want to know when to terminate charging, note BQ25703A doesn't support autonomous charging and charging has to be terminated by the host. Therefore IN_FCHRG will not change to 0 by itself, after host terminate charge IN_FCHRG will be reset to 0. Normally we use below two conditions to judge battery is ready to terminate charge:
       

        1) VBAT meet Max charge voltage requirement.

        2) Battery charging current  is smaller than the termination current(Normally suggest set as 5% of CC period charging current)

    Regards

    Shishuo