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Original question:

BQ27Z561EVM-011: bqStudio 1.3.101 Not recognize EVM board

BQ25895: How to configure for shipmode and wake up methods

chad pham
Prodigy 145 points
Part Number: BQ25895
Other Parts Discussed in Thread: BQ27Z561,

Tool/software:

I am using BQ25895RTWR charger and BQ27Z561 gauge for our system.  I am looking for app notes or design guide lines to integrate the 2 ICs with the battery.  I also looking for the instructions/suggestion how to configure the system for ship mode and wake up at the end user.

From the datasheet of the charger, if I set REG09_BIT5 (BATFET_DIS) = 1, I will force the BATFET off to prepare the system for ship mode.  I plan to use external USB charger to plug in and enable the charger which will also provide the power to my MCU.

I don't know if it is a correct idea.

What would I set the gas gauge for ship mode? Do I need to turn off the gas gauge thru I2C command?

  • 0
    TI__Guru 57541 points

    Hi,

    Please refer to below about BQ25895. For BQ27Z561 gauge connecting to chargers, please submit a new inquiry for BQ27Z561 and the corresponding team will support.

    8.2.10.1 BATFET Disable Mode (Shipping Mode)

    To extend battery life and minimize power when system is powered off during system idle, shipping, or storage, the device can turn off BATFET so that the system voltage is zero to minimize the battery leakage current. When the host set BATFET_DIS bit, the charger can turn off BATFET immediately or delay by tSM_DLY as configurated by BATFET_DLY bit.

    8.2.10.2 BATFET Enable (Exit Shipping Mode)

    When the BATFET is disabled (in shipping mode) and indicated by setting BATFET_DIS, one of the following events can enable BATFET to restore system power:

    1. Plug in adapter

    Thanks,

    Ning

  • 0 in reply to Ning T
    Prodigy 145 points

    Hi Ning,

    Thank you so much for the confirmed information of how to Exit Shipping Mode.

    For the connectivity, I was in BQ27Z561 gas gauge support and they refer me to ask charger group.  You can see my question in that thread here.

    .https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1524195/bq27z561evm-011-bqstudio-1-3-101-not-recognize-evm-board/5879006#5879006

    it seem I stuck in the middle and neither charger or gauge groups will be able to help with the question how the 2 ICs connect together with the battery.

  • +1 in reply to chad pham
    TI__Intellectual 1291 points

    Hi, connection between the devices is relatively limited, both devices bat pin's should be connected to the positive terminal of the battery. This design guide should provide a good example, as it pairs a single cell charger with a gas gauge, https://www.ti.com/tool/TIDA-01182 .The charger and gauge can be found on the second page of the schematic files sections.

    In addition both chips may of course be controlled over the same I2C bus, however the interrupt pins should not be wired together as the charger IC uses an open drain INT line and the gauge does not.

    Thank you,

    Sam