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Question about bq24104

Ray 16078
Prodigy 40 points
Other Parts Discussed in Thread: BQ24104, BQ24103A

I use bq24104 following the circuit from datasheet, the charging current ,charging voltage  are all right with my setting.

The output of PG pin is right, but the output indications pins: STAT1 & STAT2 are always wrong, (there are 4.7k pull up resistor to STAT1 & STAT2 )

 I replaced bq24104 with bq24103A, the outputs of STAT1 & STAT2 are always wrong,too.

Could anyone help me ?

Thanks very much!

  • 0
    TI__Mastermind 32360 points

    Hi Ray

     

    What is the status on STAT1 & STAT2 and TS?

    Can you please send me your schematic to the following Email?

     

    t-allag@ti.com

     

     

    Thanks

    Tahar

  • 0 in reply to Tahar Allag
    TI__Mastermind 32360 points

    Hi Ray,

     

    Thank you for sending me the schematic through email.

     

    Your TS pin is fine, but I am still confused about the status of the STAT’s and PG pins. Your explanation was not clear in your email. Can you please clarify their status so I can guide to the root of the issue? Or use the help of table 02 on the datasheet.  

     

    • Also, are they connected to an LED through a pull up resistor?
    • Can you used 10K instead of 1 K for in R54?
    • I am not sure why you did not connect SNS and BAT pin directly to RSNS as in the datasheet on figure 02.  
    • Double check your ISET1 and 2 resistor values as explained on page 24in the datasheet.

     

    Thanks

    Tahar

  • 0 in reply to Tahar Allag
    TI__Mastermind 32360 points

    Hi Ray,

     

    Please let keep this issue going through E2E instead of using Email. E2E will help TI and our customers tracking this issue and for future use.

     

    STAT1 and STAT2 are open drains usually we connect them to LED through pull up resistors. Table 2 in the datasheet is based the state of the LED. When it is OFF>>the pin is high and when it is ON>>pin is low.

     

    Having both STA1 and STAT2 >> ON is an undefined state and should not happen. During the charging process you should have STAT1= ON and STAT2=OFF. And when the battery is absent, both STAT 1 & 2 should be OFF.  

     

    For the SNS and BAT they should be connected in your layout directly to the leads of RSNS to avoid picking up noises.

     

    Thanks

    Tahar

  • 0 in reply to Tahar Allag
    Prodigy 40 points

    Hi, Tahar

               Thank you for your help.

               I connected SNS and BAT directly to RSNS.

               I am also confused the STAT status, but I followed your advice and no improvement.

    Thanks

  • 0 in reply to Ray 16078
    TI__Mastermind 32360 points

    Can you please provide me with a detailed explanation of your test procedure and what is your Vin, Vout, #cells...etc?

     

    What are your STAT pins during?

    • Battery removed
    • Charge in process
    • Charge complete
  • 0 in reply to Tahar Allag
    TI__Mastermind 31120 points

    Possible since you say the states are backwards you are misinterpreting the data sheet.  In the STAT table, ON refers to the internal STAT pin's N-CH FET bing on and a low at that stat pin.  Off is a high impedance at the stat pin letting the voltage be pulled up to the pull-up source.