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BQ24020

Shlomi Yehezkia
Mastermind 6150 points
Other Parts Discussed in Thread: BQ24020

Hi,

Please note that I intend to use varta EZ XL pack or similar –attached PDF file with NTC.

 

Q1: what is Taper timer; and USB Taper threshold mean? See page 2.

Q2: please describe how can a  time out  fault accurse – and what is the timeout time for precharge and charge? Can it be changed?  

Q3: TTE input – please explain?

Q4: using the TS pin for temperature sensing (page12). With regards to the battery I am using please explain RT1 and RT2 calculation? 

Q5: What are the decupling capacitors that TI recommended to use for this application?

 

Please find Q6 regarding the GND and power ground of the TP63020 and bq24020.

Q6: the charger bq24020 powers up (VIN) the SPS TP63020. Can the charger ground be the same plan as the SPS GND pin 2. In all hoe should the ground separation between the two IC be like. A sketch will be fine.

 

Thanks,

Shlomi

 4705.varta Bat.pdf 

  • 0
    Mastermind 6150 points

    Hi,

    I have additional question:

    Q6: When charging the battery via a USB port (100mA and 500mA) and during that time the my system is operative, meaning that several modules in my design can reach 1.2A during transmission, can this by any way case harm to the USB port?

     

    Let say I have a dead battery that need to be charged during that charging mode (might be from USB port (100ma-500mA) or AC adaptor (set for 1A) and my system is ON (my system current consumption can reach 1.2A during transitions.

     

    What will be the end result ?

    Could the charger still charge the battery ?

    Attached the block diagram.

    Thanks,

    Shlomi

     

  • 0 in reply to Shlomi Yehezkia
    TI__Mastermind 31120 points

    A_Q6: No.  The USB input is has a current limit that is programmed by the ISET2 and will "clamp" the input current to 100mA or 500mA.  If your system pulls 12A it will come from the battery or battery capacitors or the system will crash.  Therefore, is you cell is dischraged and you have a large pulse, the battery voltage will drop and possibly the system will crash.

    The charger will deliver the programmed current until the timer expires.

    Do you have an adaptor as a source?  You may want to look at a power path part like the bq2403x or bq2407y, where y=2/3/4/5