• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 233 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ40Z50: Cell undervoltage value = Shutdown voltage

Roy Chou1
Genius 16170 points
Part Number: BQ40Z50

Hi Team,

May you let me know if we can set Cell undervoltage value = Shutdown voltage?

As I know, they have 8s trip delay which means that if both of cases occurred, BQ40Z50 will do CUV first and then shutdown instead of the same time. Is it correct?

If you don't suggest the same value between both of them, do you have any suggestion for minimum voltage gap? Thank you. 

Regards,

Roy

  • 0
    TI__Guru** 105760 points

    Hello Roy,

    Generally the CUV is much higher than the shutdown voltage as you can see from the default settings, the shutdown is usually wanted when the gauge is very over discharged and the maximum power conservation should be entered. CUV is more meant to stop a discharge if the battery voltage drops very low, either in active discharge or relax to stop from discharging more. This leaves a buffer of energy for the gauge to remain active until the batteries eventually hit the shutdown voltage.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Genius 16170 points

    Hi Wyatt,

    So may you let me know if we set the CUV voltage = shut down voltage, what is the risk? 

    And may you let us know the scenario that suggest use CUV instead of shutdown mode?

    Regards,

    Roy

  • 0 in reply to Roy Chou1
    TI__Guru** 105760 points

    Hello Roy,

    It it up to the application requirements, there is no issue with these settings from a firmware point of view. It is a strange setting since in shutdown the FETs will be off so discharge will be prevented until a charger is applied. So the CUV may have little affect on the behavior.

    Sincerely,

    Wyatt Keller