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BQ24005: 1Hz pulse Fault simulation

gaurav gothoskar
Prodigy 40 points
Part Number: BQ24005
Other Parts Discussed in Thread: BQ25171-Q1, , BQ24004
Hello,  I need to know how to simulate the 1Hz fault signal on the STAT1 pin. 
Can I subject the IC to an OVP event or heat the IC to trigger an die over temp? 

I need to ensure that the IC actually outputs this 1Hz pulse under certain conditions. 

Thanks,
Gaurav
  • 0
    TI__Mastermind 20570 points

    Hi Gaurav,

    Yes, typically if charge is suspended by APG/THM fault, the charge status pin will indicate a fault condition. However, since this is a legacy device, we have very limited support and knowledge, I would like to recommend BQ25171-Q1 if you would like to use a linear charger for 2S Li-ion battery charging. This device is our latest release which has much higher accuracy in charging parameters and easier to use. 

  • 0 in reply to Jing Zou
    Prodigy 40 points

    Hello,

    I need to use a controller that has a Vsense pin to compensate for the voltage drop between the output of the controller and the actual battery contacts. The IC you suggested does not have the Vsense pin. I also need autonomous charging without the intervention of a MCU and BQ24005 fits the bill nicely. 

    On the BQ24005, there are 2 types of faults, one which is caused by the APG/THERM which causes both the STAT1 and STAT2 lines to be pulled low. The other one is caused because of some other reasons (seems like timer expiry from flowchart on Fig 15) WHICH RESULTS IN THE 1HZ FLASH ON THE STAT1 PIN. 

    I NEED TO UNDERSTAND HOW TO SIMULATE THIS 1HZ FAULT PULSE ON THE STAT1 PIN. 

    Thanks,

    Gaurav

  • 0 in reply to gaurav gothoskar
    TI__Mastermind 20570 points

    Hi Gaurav,

    Sorry about the confusion. Below is what I found in the user guide. The red LED mentioned below is connected to the STAT1.

    "The bq24004/5/6 enters preconditioning mode if the battery is below the LowV threshold. In this mode, the bq24004/5/6 trickle-charges with approximately 65 mA for approximately 23 minutes. If the battery does not reach the LowV threshold during this period, then the charge current is terminated and the bq24004/5/6 enters fault mode. The red LED flashes in fault mode. This feature may be tested by removing input power, replacing the battery with a 30–40-Ω resistor from BAT+ to DC–, and applying power (Vin) for more than 23 minutes. Fault mode is reset by toggling input power or enable pin."

  • 0 in reply to Jing Zou
    Prodigy 40 points

    Hi Jing Zou,

    This is exactly what I was looking for. Many thanks!

    Regards,

    Gaurav