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BQ25898D: about Shipping Mode

user777540
Expert 1020 points
Part Number: BQ25898D

hello,

I have two questions.

The QON pin is always open.

(1) Section 9.2.10.1 explains BATFET Disable Mode (Shipping Mode).
 Is Shipping Mode when voltage is applied to VBAT when power is not supplied to VBUS and VBAT?
If the answer is Shipping Mode, does that mean that no voltage is output to SYS until the VBUS input is turned on? (Register control is not performed.)
 
(2) I understand that you can enter Shipping Mode by setting BATFET_DIS bit.
Does the device enter Shipping Mode if both VBUS and VBAT are powered off without setting the BATFET_DIS bit?

best regards

  • 0
    TI__Genius 10240 points

    Hi there,

    The shipping mode is to minimize the power consumption of a device when it is in shipping or on the shelf, which means the battery is connected but no adaptor. The BATFET is OFF so there is no voltage on SYS. If the adaptor is connected on the input side, the BATFET will be turned on.

    The shipping mode entry requires setting BATFET_DIS bit. The watching dog timer should be disabled before setting the BATFET_DIS bit. Otherwise, the BATFET will be turned on when the watchdog time is expired. If both VBUS and VBAT are powered off, the device has no power and all register values will not be retained. The charger will enter default mode (not shipping mode) when it is powered from either VBUS or VBAT.  

     

  • 0 in reply to ezhao
    Expert 1020 points

    hello,Eric

    In other words, does the BATFET turn on when the VBAT power is turned on from the following states?

    QON pin is always open and power is not supplied to VBUS and VBAT

    best regards

  • 0 in reply to user777540
    TI__Genius 10240 points

    Hi there,

    The BATFET will be turend on not dependent of QON in the case you described. The charger powers the system with battery only.