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WEBENCH® Tools/BQ25606: Micro-controller restarting when battery removed from from the Output terminal.

RAJARSHI ROY
Prodigy 140 points
Part Number: BQ25606

Tool/software: WEBENCH® Design Tools

Hello Everyone,

We have been using the BQ25606 battery charging IC for quite some time, but recently we have faced a problem.

The VSYS voltage is not constant and it's constantly fluctuating (ranging from +3.7 V to +4.4 V ) when the battery is removed. So, in this situation the micro-controllers connected to the VSYS is getting restarted(in our case our ATMEGA) every-time.
But when the battery is connected, the device is running perfectly.
Can you please suggest a possible solution to our problem. 
  • 0
    TI__Mastermind 25800 points

    Hey Rajarshi,

    That is normal operation when charge is enabled. When there is no battery, the charger is going through a "mini" charge cycle with any capacitance on the BAT pin. This only occurs when charging is enabled.

    One solution customers have used in the past with a removable battery in their system is to use the NTC thermistor on their battery connected to the TS pin of the charger. The TS pin on the charger is typically used with an NTC thermistor attached to the battery to monitor battery temperature, and if removed from the Resistor network, will force charge to be disabled. 

    Alternatively, if you know the time of the removal event, you may pull the /CE pin high. 

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    Prodigy 140 points
    Hey Joel,

    Thanks for the prompt reply.

    But is there any other way this can be resolved? I mean for the 'voltage fluctuation' part such that we get a more stable output ,rather than just cutting the output voltage off? Does the BQ25606 at all work this way?