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Original question:

BQ25606: BQ25606: BQ25606 STAT pin stays low after battery charged

BQ25606: WRONG STATUS - STAT LED BLINK

Peng Qiu
Prodigy 140 points
Part Number: BQ25606

Hi，

Recently，I used BQ25606 in my project，the part of schematics are as follows:

In fact, The VBUS  using a adapter ：12V/1A。The battery is 2600mAh.

usually，sys load current about 300-500mA，LED Foward Voltage is about 2V，The charging current is close enough to the setting value，I've measure PMID about 11.9V，REGN is 6V，TS is 3V，but，when I charged a battey which initial voltage is about 3.5V，the stat LED and PG status is correct，after charged 8 hour or more，the STAT LED Blinking at 1Hz, at this time，the VBAT Voltage is close enough to 4.2V，PMID still about 11.9V，REGN is 6V，TS is 3V，if I remove the same battery and plug in again quickly ，after a while，the stat LED back to normal ， stat indicator is HIGH，I‘m  confused !! why?? Why does timer fault  happen ？Even if I increase the charging current to 1A，this situation still exists. By the way，the D+ D- do not connect anaything. Why does timer fault  happen  ？


Best Regards



  • 0
    TI__Mastermind 24075 points

    Hi Peng,

    The issue causing STAT1 to blink and reporting fault is safety timer fault. From Timing Requirements of EC table, Typical charge safety timer is between 8hrs and 12 hrs, with a nominal range of 10hrs.

  • 0 in reply to Kedar Manishankar
    Prodigy 140 points

    Hi ,Kedar

    I know it is a timer fault case，but I don't know why it would happen .The charging current is set to 520mA，even  1A，both happened blinking.The battery is only 2600mAh.

    Regards,

    Peng

  • 0 in reply to Peng Qiu
    TI__Mastermind 24075 points

    Hi Peng,

        Safety timer is a backup safety mechanism in case of damaged cell that will never reach charge complete. Can you replace battery cell? Can you plot a full charge cycle? Measure charge current and charge regulation voltage with new battery. What is voltage on battery when you remove it and measure?

  • 0 in reply to Kedar Manishankar
    Prodigy 140 points

    Hi ,Kedar

    I‘ve’ replaced more than 8 batteries. at the beginning of the battery is 3.5V. When the STAT LED blinking,I re-plug the batter（before re-plug , I have measured the Battery voltage at this time，it's close to 4.2V） or  the VBUS adapter， after re-plug , the STAT LED back to nomal ,constantly Light up again，after a mean while（Less than five minutes）, the light is off. It looks like the device automatically starts a new charging cycle.

    Regards,

    Peng

  • 0
    Prodigy 140 points

    I think the problem is in the adapter，the adapter  is based on the Primary side regulated flyback AC-DC ，most of the time，the load current has 200-300mA，the adapter Load Transient not good enough，especially in Light load。

  • 0 in reply to Peng Qiu
    TI__Guru 52371 points

    Peng,

    Thanks for your update. The thread is considered solved and closed.

    Regards,

    Ning.