• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 64 subscribers
  • Views 130 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

BQ24296M: How to turn BMS output OFF, if I2C fails.?

Arjun Udayakumar
Prodigy 30 points
Part Number: BQ24296M

Tool/software:

We have used bq24296M as the BMS for a medical device. A host MCU controls the bq24296M via I2C. The whole power management in the system is done by bq24296M. 

To turn OFF, the host MCU sends an I2C data to BMS which cuts off the entire power supply.

Now to turn ON again, a manual push button is present which controls the internal gate logic inside BMS which turns ON the device again.

The question is how to turn OFF the power out from BMS, if the I2C channel fails.?

  • +1
    TI__Mastermind 27325 points

    Hello Arjun, 

    Thank you for reaching out via E2E.

    Arjun Udayakumar said:
    To turn OFF, the host MCU sends an I2C data to BMS which cuts off the entire power supply.

    In your description are you referring to use of the 'BATFET_Disable' bit in I2C REG07?

    Arjun Udayakumar said:
    The question is how to turn OFF the power out from BMS, if the I2C channel fails.?

    Assuming 'BATFET_Disable' is the feature you are referencing in your question I2C is the only possible method to force BATFET off to disconnect power path from battery to SYS output. 

    For your information the BATFET will turn off on its own if battery discharges below Vbat_dpl threshold (max 2.6V) located on datasheet page 7.

    Best Regards,

    Garrett