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BQ40Z50-R2: How to judge the OCD recovery time when sleep mode?

Statham Su
Genius 4990 points
Part Number: BQ40Z50-R2

Hello Sir:

Our customer is testing the OCD functions in sleep mode.

Please refer the tested connection diagram as below figure.

When testing they found that recovery time will be over the setting, such as delay time is 5 seconds but the real recovery time is about 6.3 seconds to 27.2 seconds.

But the other phenomenon if we setup the parameter of voltage time to 5 seconds, the real recovery time will be 20 seconds.

If we setup the parameter of voltage time to 30 seconds, the real recovery time will be 120 seconds.

Please refer the figure as below that customer adjusts the voltage time in the red area.

Also they tried the current time, but it will not effect the recovery time.

Please let us know how to judge the OCD recovery time, we need to explain to customer.

Also I attached the gg file for you reference.C03 1S1P.gg.csv 

  • 0
    TI__Guru** 103165 points

    Hello Statham,

    The gauge will be sampling less frequently in sleep mode which is why the protection time may be longer because it depends on when the discharge starts and the gauge begins sampling.

    Also make sure the current() is continuously over the OCD recovery threshold for the recovery time, I see it is set to 0mA in the .gg file. 

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Genius 4990 points

    Hi Keller:

    Thanks your recommendations.

    As we have been known when OCD happening that DFET is off and current()=0.

    The other if the PACK output voltage has residual voltage when OCD happening, please refer the figure as below.

    The blue line is pack voltage, orange line is current.

    Did you think that residual voltage will effect the recovery time? 

    Please let us know your recommendations.

    Thanks a lot.

     

  • 0 in reply to Statham Su
    TI__Mastermind 24870 points

    Hello Statham,

    The OCD will trip based on a set threshold regardless of pack voltage.