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Original question:

BQ24193: Charge operation problem

BQ24193: battery detection

Shunsuke Nagata
Genius 13050 points
Part Number: BQ24193
Other Parts Discussed in Thread: BQ25892

Hi,

I have a question in bq24193 for battery detection. I guess the device has feature to check if battery is inserted or not.

Is it check with TS pin or Bat pin? (Or  are both pin check if battery is inserted?)

Regards,
Nagata.

  • 0
    TI__Mastermind 25800 points

    Hey Nagata-san,

    This charger does not have the ability to check whether a battery is inserted or not.

    However, if you are using the TS pin with a battery-side thermistor, the charger will automatically enter the TCOLD region when the battery and NTC are removed. However, this is not a direct battery detection; rather it suspends charging.

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    TI__Genius 13050 points

    Hi, Joel -san,

    Thank you for your supports.

    User would like to detect if battery is asserted before starting charge with his HOST (such as MCU). I believe Host can detect from THERM_STAT bit in REG08. Is there another method to detect it with external MCU?

    Regards,
    Nagata.

  • 0 in reply to Shunsuke Nagata
    TI__Mastermind 25800 points

    Hey Nagata-san,

    You may consider using a device like the BQ25892 which has an integrated ADC to monitor the battery voltage as well as other charging parameters.

    Additionally, you can utilize the BAT_LOADEN bit to determine if a battery is present. 

    The BAT_LOADEN bit will sink ~15mA of current into the BAT pin. If there is no battery present, the ADC battery voltage read will be at the lowest reading. This would tell you if the battery is not present. 

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    TI__Genius 13050 points

    Hi, Joel -san,

    Unfortunately, my customer doesn't have time to evaluate new device due to his development schedule. ( He has experience to use bq24193.)

    Could you please let me know the method to detect if battery is asserted by MCU?

    Regards,
    Nagata.

  • 0 in reply to Shunsuke Nagata
    TI__Mastermind 25800 points

    Hey Nagata-san,

    Your customer would have to use the REG09 NTC_FAULT bits to determine if the battery is removed. However, keep in mind that this fault will also assert if the battery is too cold.

    In other words, the customer cannot distinguish between a COLD battery or an absent battery; however both situations would force the TS pin % into the COLD region and suspend charging automatically.  

    Regards,

    Joel H