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Original question:

BQ24105-Q1: How to use BQ24105-Q1 for NiMH charging without using an external MCU

BQ24105-Q1: About Charging Flow Control Logic

Koji Hayashi92
Mastermind 7020 points
Part Number: BQ24105-Q1

Hi TI-team

My customer has questions about items in the following documents.

http://www.ti.com/jp/lit/an/slua843/slua843.pdf

Regarding the description in the red frame, there is no description in Table 1 that both the statuses of STAT1 and STAT2 are High.
What happens when both are high ?
 
If /CE is set high after STAT1/2 is high and charging is stopped, does STAT1 change from high to low ?
Or is STAT1 going from High to Low after /CE goes from High to Low ?
 
Best Regards,
Koji Hayashi
  • 0
    TI__Guru**** 165766 points

    Hi Hayashi-san,

    In the datasheet tables, OFF indicates that the open-drain transistor is turned off and therefore pulled "high" to the pull up voltage.  ON indicates that the open drain transistor is on pulling the pin "low" to GND.

    Having both STAT1 and STAT2 ON (low) is not a valid state.

    Take /CE high is considered charge suspend so both STAT1 and STAT2 will be OFF (high).  When /CE is taken low, STAT1 turns ON (low).

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Mastermind 7020 points

    Hi Jeff-san

    Thank you for quick response.

    Sorry for my late reply.

     

    It seems that the image I attached could not be displayed, so I will attach it below.

    >Having both STAT1 and STAT2 ON (low) is not a valid state.

    The description in the red frame states that both STAT1 and STAT2 are High.

    What is this state ?

    >Take /CE high is considered charge suspend so both STAT1 and STAT2 will be OFF (high).  When /CE is taken low, STAT1 turns ON (low).

    I understand.

    Best Regards,

    Koji Hayashi

  • 0 in reply to Koji Hayashi92
    TI__Guru**** 165766 points

    Hi Hayashi-san,

    STATx high is OFF.  STAT1=STAT2=OFF is valid and, in the case above, is charge suspended.

    Regards,

    Jeff