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BQ25619: Register state after exiting Ship Mode

Zhonghui Xu
Expert 5445 points
Part Number: BQ25619
Other Parts Discussed in Thread: BQ25618, LM10506

Hi team,

We use BQ25619 with a portable product. It connects to a 18650 Li-Ion cell and the main system board with an MCU controlling the BQ25618 is powered by the PMID output. A LM10506 provides core and VIO supplies for the MCU. To conserve charge on the battery, we actively put the BQ25650 in ship mode when applicable. This removes all power to the main system board and minimizes current consumption from the battery. We get it out of ship mode by activating /QON with a switch. We need the booster to start operating immediately when the BQ25619 is forced out of ship mode with /QON pulled down (VBAT > VBST_BAT), without host control. Is this possible? It seems that whenever BQ25619 is put in ship mode (BATFET = OFF), the registers has POR values -> BST_CONFIG = 0. This is a major problem for us as LM10506 VUVLO_RISING = 2.9V condition is never met with VBAT < 3.5-3.6V if the booster is not running and consequently we have no active main system board and MCU to set BST_CONFIG = 1.

Best regards,

  • 0
    TI__Genius 10385 points

    Zhonghui and ,

    Let me draw your attention to 8.3.7.2 BATFET Enable (Exit Ship Mode).

    Specifically let’s discuss the method of exiting ship mode you have mentioned: via /QON. This is numbered item #4.

    “A logic high to low transition on QON pin with tSHIPMODE deglitch time to enable BATFET to exit ship mode. EN_HIZ bit is set to 1 (regardless of adapter present or not). Host has to set EN_HIZ bit to 0 before boost mode enable. Once adapter plugs in, EN_HIZ will be cleared.”

    It is clearly stated that the EN_HIZ bit will be set to 1 autonomously when entering ship mode. It is not possible to operate in boost mode when EN_HIZ is 1, so we say that EN_HIZ must first be set to 0 when exiting ship mode before boost mode can be enabled. Based on your application the host will obviously not be able to do this.

    In conclusion, the charging IC does not POR in ship mode. Additionally, it will not be possible for you to instantly transition out of ship mode and into boost mode in the current system level configuration.

    So what are the alternatives for the end user?

    The end user can insert the adapter to exit ship mode and then the MCU will be powered from the adapter via PMID.

    Would it be possible to operate the MCU from the SYS output?

    Let us continue this discussion in the email thread has already established.

    Best Regards,

    Ricardo