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BQ27Z561: BQ27Z561: Learning Cycle Charging Rate

Shivani Patel
Prodigy 145 points
Part Number: BQ27Z561
Other Parts Discussed in Thread: BQ25601

Hello TI Team,

We are using BQ27z561 fuel gauge IC and BQ25601 Charger IC in our custom board. We need to perform the learning cycle for 2000mAh battery.

With which values we need to charge the battery and discharge battery in learning cycle procedure?

Regards,

Shivani Patel

  • 0
    TI__Mastermind 26341 points

    Hello Shivani, 

    Please refer to the Achieving The Successful Learning Cycle document for which values you need to set to successfully complete the learning cycle. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 145 points

    Hello Jonny,

    Okay, so in Achieving The Successful Learning Cycle, it is mentioned for charging that C/2 charge rate is recommended, however the charge rate is of no consequence.

    So, I have few more queries in this, can you please clarify below points?

    1. Can I choose the charge rate other than C/2 as stated in the document in the learning cycle (golden image generation) procedure ? If yes then, is there any impact on learning cycle performance? 

    2. I have 2000 mAh battery, so in learning cycle (golden image generation)  procedure if I charge battery by 2000/2 = 1A, then can I change my charge  rate in my actual application? which means is it possible that if i charge my battery by 1A in learning cycle (golden image generation) and after that can I change the charging current (ICHG) to 2A in application or do I need to set charging current 1A only in application as well? Can you please advice here?

    Kindly provide your inputs for above queries.

    Regards,

    Shivani

  • +1 in reply to Shivani Patel
    TI__Mastermind 26341 points

    Hello Shivani, 

    I have answered your questions below: 

    1. Yes you can choose a charge rate other than C/2, this is just the recommended value. The charge rate will affect the speed of the learning cycle, but will not have an impact on the learning cycle performance. Be sure to use a charge rate that is within your battery's recommended operating conditions as stated in the battery datasheet. 
    2. You can have a different charge rate during the learning cycle than what is used in the application. As long as you are charging within the maximum rate specified in the battery datasheet, there should not be an issue here. 

    Regards, 

    Jonny.