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BQ76952: BQ7695202

barkha verma
Prodigy 50 points
Part Number: BQ76952

What is the possible way to bring the device out of the discharge cut in case of OCD1 as the document say that the charging current can only bring it out. But usually, in general load removal works as a recovery model for the same. So how can i configure it so that it detects load removal and comes out of the discharge cut.

Also, what is the configuration for OCC , for example we are setting OCC threshold at 10mV but the OCC cut is coming up on 12A and 4mV for 4A but since we have the unit of 2mV so why it is not working accordingly and we cannot see the safety alert on the GUI for the same.

Also help me with the internal balancing configuration because i am not able to check it in charging condition only.

  • 0
    TI__Mastermind 27321 points

    Hello,

    The OCD1 recovery is based on a charging current. The OCDL recovery is the one based on load detect. These are two different protections.
      -> What can be done for OCD1 is set the Protections:OCD:Recovery Threshold to 0mA, this way it won't require a charging current to recover.
     
    As for OCC, it seems like you are using a 1mOhm sense resistor. Further tolerance analysis is required when using a 1mOhm resistor. 10mV / 10 A ~= 0.83. This seems to be a tolerance issue. Can a bigger sense resistor be used? The BQ76952 is less dependent on tolerance when bigger sense resistors are used.

    -> Further tolerance analysis (value tolerance, temperature variation, and so on) and PCB design margin should also be considered, so a sense resistor of 1 mΩ is suitable with a 50-ppm temperature coefficient and power rating of 1 W.

    -> The quality of the Kelvin connections at the sense resistor is critical. The sense resistor must have a temperature coefficient no greater than 50 ppm in order to minimize current measurement drift with temperature. Choose the value of the sense resistor to correspond to the available overcurrent and short-circuit ranges of the BQ76952 device. Parallel resistors can be used as long as good Kelvin sensing is ensured. The device is designed to support a 1-mΩ sense resistor

    barkha verma said:
    Also help me with the internal balancing configuration because i am not able to check it in charging condition only.

    Please check previous answers posted on e2e for cell balancing. CLICK HERE

    Regards,
    Jose Couso