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BQ2004E: Reliability when the TM1 terminal is connected to GND while energized

user1160324
Prodigy 50 points
Part Number: BQ2004E

In order to shorten the operation time of the initial trickle charge and immediately carry out the operation test of the quick charge, the TM1 terminal is connected to GND while the Energized.
Will the reliability of the IC deteriorate?

  • 0
    TI__Mastermind 24075 points

    Hi,

      TM1 pulled low is a valid state so there is no issue with deterioration of reliability of IC..

  • 0 in reply to Kedar Manishankar
    TI__Genius 13200 points

    hi Kedar-san,

    Thanks for your prompt response on this.

    Maybe, This is my customer, so let me follow up one more their question.

    Are their any other way to force the mode to Quick charge state except asserting TM1 to LOW?

    They used TM1 to change from trickle charge to quick charge mode now, but they would like to make sure if this way is TI recommended or if there is a another recommended method for the mode change in operation.

    Regards,

    Takashi Onawa

  • 0 in reply to Takashi Onawa
    TI__Mastermind 24075 points

    Hi Takashi-san,

        The trickle charge is a safe period when conditions for fast charge are verified before starting fast charge. This is helpful for deeply discharged battery packs as it charges at a low safe current. There is no time limit on this charge pending state; the charger remains in this state as long as the voltage or temperature conditions are outside of the allowed limits.

    You can use TM1 to disable if you don't need this feature.

       

  • 0 in reply to Kedar Manishankar
    TI__Genius 13200 points

    Hi Kedar -san,

    Thanks for your prompt response on this. OK, I understood that TM1 should be recommended.

    By the way, The point they want to check is to assert TM1 Low "during operation", Is there a problem with this operation? For example, TM1 should be determined on power up.

    Regards,

    Takashi Onawa

  • 0 in reply to Takashi Onawa
    TI__Genius 13200 points

    Hi Kedar -san,

    Sorry one more additional question on the TM1 control.

    According to the engineer, They are concerned about whether chattering during the switchover will cause problem. Does TM1 pins have Schmitt trigger function in it or do they need to prevent to be input such the non settled signal to the device?(If yes, I will recommend them to add some logic for secured logic signal input)

    Regards,

    Takashi Onawa

  • 0 in reply to Takashi Onawa
    TI__Mastermind 24075 points

    Hi Takashi-san,

        We don't have that information regarding the TM1 pin for this part. This is an old part so we have limited internal design information regarding it. Customer will have to verify on their board.