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Captured to bq2415x: What is weak battery detection of a USB input battery charger? wiki page

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I have a question about BQ24150.

Chung Sang Hwa
Prodigy 10 points

In bq24150' datasheet, what does "weak battery detection" mean?

I can't understand that how does it work? On verifying in my prj, i can't find difference as before. 

Could you explain "weak battery detection"?

 

from Andy.

 

  • 0
    TI__Guru*** 143950 points

    This is an USB spec. The USB spec states that a battery can not be charged until the portable device enumerates if the battery voltage is above the "weak battery threshold". If the battery is below the weak battery threshold, the portable device is allowed to charge without enumeration for 45 minutes.

    The USB spec allows the designer to select the weak battery threshold for their system. The bq24150 default is 3.7V because that is a high enough voltage for most systems to power up and be able to enumerate.