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Original question:

BQ24075: How to find connection/Disconnection of Li-Battery on BAT1&2 Pins?

BQ24075: About Battery Detection Mode

Yuta Nishie
Genius 3200 points
Part Number: BQ24075
Other Parts Discussed in Thread: BQ25185

Hi,

1) The following thread discusses how to find battery connection/disconnection. In conclusion, what are the methods to find?

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1074902/bq24075-how-to-find-connection-disconnection-of-li-battery-on-bat1-2-pins

Our customer puts a gas gauge IC between the BQ24075 and the battery to check the battery level. Therefore, the gas gauge IC cannot detect the battery level because of the VBAT=0V to 3.5V toggle by Battery Detection Mode.

2) What are the benefits of using Battery Detection Mode?

Best Regards,

Nishie

  • +1
    TI__Mastermind 21705 points

    Hi Nishie, 

    Please see my comments below. 

    1) The conclusion from the previous thread you linked is the following. One option is to incorporate circuity into the design to pull CE high when battery is disconnected. With CE pin driven high the battery detection routine will not run. The other option mentioned is to use ~250ohm resistor from BAT to GND to prevent VBAT from toggling between 0V and 3.5V. 

    2) The battery detection feature allows the BQ24075 IC to determine if a battery is connected or not automatically. The feature is a benefit for full standalone charging. As you point out the feature is not designed with a gas gauge IC in mind. 

    An alternative option for your customer to consider is the BQ25185 device. This IC is significantly newer than the BQ24075 with the same functionality, and does not have a battery detection mode.  

    Best Regards,

    Garrett