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Original question:

BQ27531-G1: BQ27531-G1

BQ27531-G1: Pack infomation

Shunsuke Nagata
Genius 13070 points
Part Number: BQ27531-G1

Hi,

My customer found  that life time of battery is suddenly decreased as below graph.
The life time is changed from 12 hour to 8 hour…

Y-axis : Life time of battery from 100% to 0%(unit : hour)
X-axis : number of charge-discharge cycle

 

With their field information, the system seems to experienced shut-down ( Battery voltage sometimes below the EDV).
Bq27531 has two Pack information (Pack0 and Pack1). They guess bq27531-G1 selects different Pack_x information once the system recovered from shut down and update different FCC at the time.

 To confirm their scenario, they request bellows
1. How to select Pack0 and Pack1 profile manually.
Or how to check which profile is using

 2. Is it possible #1 in TI EVM?

They will collect the device from field and analysis the failure.
This issue is happened in the field. So, the emergency action is required…. Could you please give me your support?

Regards,
Nagata

  • 0
    TI__Guru* 76230 points

    Hi Nagata,

    There is the choose_chem_id A, 0x0018 command and the choose_chem_id B, 0x0019. After the initial OCV measurements has been taken, the command has to be sent by the host.

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    TI__Genius 13070 points

    Hi, Onyx -san,

    I would like to know about 7.2 chapter in TRM.

    With the infomation, Only way to select Pack0 or Pack1 infomation is sending the command by Host.
    - Is my understanding correct?
    - Even if user insert another battery pack to system, Will Pack not change without sending command by Host? (e.g when default pack 0 is used, Pack0 always will be select after insert another battery pack)

    I would like to check the selection of Pack 0 or Pack 1. When user insert battery, algorizum check battery parameter and select Pack0 or Pack 1 automatically.

    Regards,
    Nagata.

  • 0 in reply to Shunsuke Nagata
    TI__Guru* 76230 points

    The guage automatically selects which profile matches the inserted battery based on initial ocv measurements. However, using the commands allows the user select a different profile.

    thanks

    Onyx