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Original question:

[FAQ] BQ25171-Q1: Configuration Pins and Design Questions

BQ25171-Q1: Regarding BQ25171-Q1 IC.

Mahesh Malyam
Prodigy 60 points
Part Number: BQ25171-Q1

Hi Team, 


We are trying to use BQ25171-Q1 IC in our design.
I have one doubt regarding one Pin of  BQ25171-Q1  called CHM_TMR So it sets the Chemical of battery and safety timer till here i understood but in table there is option saying Timer disable.
So this Timer disable How does it work ? 
How will the IC stop charging if timer is disable ? 
Will it be charging the battery until some signal is given to the IC ? 
It will be really helpful if someone would give proper explanation 

Thanks, 
Muhafeez 

  • 0
    TI__Guru* 75956 points

    Hi Muhafeez

    Mahesh Malyam said:
    So this Timer disable How does it work ? 

    Bill J - This will depend on the system and battery requirements, it is an option we provide.  Customer could use an external circuit to terminate charge, possibly trickle charge from low current source or other.

  • 0 in reply to Bill Johns
    Prodigy 60 points

    Hi Bill, 

    Are you referring to using a external circuit at Iset pin? 
    Can you please explain it more ? 

    Thanks,
    Muhafeez

  • +1 in reply to Mahesh Malyam
    TI__Guru* 75956 points

    Hi Muhafeez

    Mahesh Malyam said:
    there is option saying Timer disable.
    So this Timer disable How does it work ? 
    How will the IC stop charging if timer is disable ? 

    Bill J -- If the device is configured to Li+ Timer Disable (CHM_THR = 62k) it will not end the charge cycle based on time.  Charge current will need to decrease below 10% of fast charge current to end charge cycle.  

    Recommend using the 5 hr (100k) or 10 hr (82k) unless your application requires long charge cycles and there is no risk of battery damage.

    The above circuit will change the charge current from high to low.