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BQ25611D: some questions

Dylan Sun
Prodigy 105 points
Part Number: BQ25611D

Tool/software:

hi,

I have some question for BQ25611D.

1.

If VIN(USB or adaptor) is not plug in ,
and the voltage of VSYS is higher than BAT pin,
Will it have current flowing into the battery through the POWER PATH?

2.

If VBUS and Battery has voltage drop and down to UVLO and I2C turn off,

When power is recovered , Does I2C need to be reset?

3.

Described in spec :"During faults of NTC_FAULT that lead to charging suspend"

Does it contain cold/hot only , or all of them?

4.

When it is lower than VBAT_DPLZ, BATFET will latch off.
In the Characteristics table of spec, the battery voltage is higher than VBAT_DPLZ can turn on BATFET,
But in the feature description of spec, the VIN must be plugged in.
Which one is correct?

thanks.

Dylan

  • 0
    TI__Mastermind 31140 points

    Hi Dylan, 

    Please see my comments below.

    Dylan Sun said:
    If VIN(USB or adaptor) is not plug in ,
    and the voltage of VSYS is higher than BAT pin,
    Will it have current flowing into the battery through the POWER PATH?

    Yes current can flow to BAT pin for this case where VSYS is higher than VBAT. In general the BQ25611D device is not designed to operate in this way. When USB or adapter is not plugged in it is expected that battery is the power source for SYS rather than a separate source. 

    Dylan Sun said:

    If VBUS and Battery has voltage drop and down to UVLO and I2C turn off,

    When power is recovered , Does I2C need to be reset?

    When power is recovered I2C will re-enable on its own. 

    Dylan Sun said:

    Described in spec :"During faults of NTC_FAULT that lead to charging suspend"

    Does it contain cold/hot only , or all of them?

    Please refer to datasheet section 9.3.6.4.1. Charge is suspended if battery temperature is outside of T1 or T5 threshold. Between T2 and T1 and T3 and T5 charge is modified, but not suspended. 

    Dylan Sun said:
    When it is lower than VBAT_DPLZ, BATFET will latch off.
    In the Characteristics table of spec, the battery voltage is higher than VBAT_DPLZ can turn on BATFET,
    But in the feature description of spec, the VIN must be plugged in.
    Which one is correct?

    The battery over-discharge protection description on datasheet page 27 assumes the battery cannot be removed from the system. For this case an input source must be plugged in to recover.  If battery voltage falls below VBAT_DPL and then all power is removed from BQ25611D (i.e. battery disconnected) if battery is reconnected with a voltage higher than VBAT_DPLZ BATFET will turn on. 

    Best Regards,

    Garrett