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BQ25620: About CE pin connection

teritama
Expert 2155 points
Part Number: BQ25620

Tool/software:

Hi team,

In datasheet, CE pin is said "Battery charging is enabled when EN_CHG bit is 1 and CE pin is LOW.".

Does this means it is need for enable battery charging that EN_CHG bit is 1 and to switching CE pin to connect to GND in the case of CE pin pull-up?

We want to know if in the case of CE pin is fixed Hi, we can control the battery charging with EN_CHG register only or not.

Best regards,

teritama

  • 0
    TI__Mastermind 31120 points

    Hi Teritama-san,

    Please see my comments below.  

    teritama said:
    Does this means it is need for enable battery charging that EN_CHG bit is 1 and to switching CE pin to connect to GND in the case of CE pin pull-up?

    Correct, to enable charge EN_CHG bit needs to be set to 1b and CE pin needs to be pulled to GND. If either EN_CHG or CE pin is not set appropriately charge will be disabled. 

    teritama said:
    We want to know if in the case of CE pin is fixed Hi, we can control the battery charging with EN_CHG register only or not.

    Charge will always be disabled if CE pin is fixed Hi. If you wish to control charging with only EN_CHG register then I recommend having CE pin fixed LOW. 

    Best Regards,

    Garrett 

  • 0 in reply to Garrett Kreger
    Expert 2155 points


    Hi Garrett-san,

    Thank you for quickly answer. I understood when we want to control by EN_CHG register, CE pin should be fixed Low.

    This CE pin feature seems for the case that we need to force stop charge for device protection by hardware control in my understanding.

    Is this correct?

    In my understanding, CE pin is pull-down in typical use case from your comment.

    What is the case of CE pin is pull-up is required?

    We're interested in why charging enable control require both EN_CHG and CE pin.

    Best regards,

    teritama

  • 0 in reply to teritama
    TI__Mastermind 31120 points

    Hi Teritama-san, 

    Please see my answers below. 

    teritama said:

    This CE pin feature seems for the case that we need to force stop charge for device protection by hardware control in my understanding.

    Is this correct?

    Correct. Some customers also use /CE pin to default disable charge via hardware, then once MCU is powered it can make determination of when to enable charge by pulling /CE pin LOW. 

    teritama said:
    What is the case of CE pin is pull-up is required?

    /CE pin pull-up is not required. It is certainly acceptable to leave /CE pin pulled low at all times. 

    The BQ25620 device provides both /CE pin and EN_CHG register charge enable control to allow for greater flexibility of use. Some customers prefer to enable/disable charge via /CE hardware pin and others prefer using EN_CHG register. 

    Best Regards,

    Garrett