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AFE SC Chg Cfg Verification Testing

martin gibbs
Intellectual 520 points

Our Li Ion battery is currently undergoing verification testing. The problem we are having is how to simulate a charge short circuit and verify its response behaviour.

Basically what happens is when a simulated short circuit of the cells occurs there is no volts to power the 20Z45 and hence nothing happens.

My question is what is the idea behind the "AFE SC Chg Cfg" setting?

Thanks

Martin

  • 0
    TI__Guru* 76230 points

    Hi Martin,

    The AFE SC chg prevents damage to the cells in the event of a short circuit occurring on the battery pack by turning off the charge and dsg fets. If a short circuit during charge occurs and the device responds, the IC still remains powered through the pack pin from the charger.

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Intellectual 520 points

    Thanks for the response. The problem we are getting is that the device is not disabling the FETs. Consequently the Charger voltage is collapsing.

    We have concluded the discharge verification tests at overcurrent and discharge and have scope traces to verify at 915us but charge short circuit test does not trip the FETs at our set current. 

    Any suggestions would be welcome.

    Thanks,

    Martin

  • 0 in reply to martin gibbs
    TI__Guru* 76230 points

    Hi Martin,

    What is the value of your sense resistor and what is the short-circuit voltage threshold set to? When you have a sc condition, does the TCA and SCC bit get set? If the RSNS bit is not set if your sense resistor value is small, I would recommend you set it. This divides the AFE SC Chg voltage by two. If you have it already set, and you are seeing this issue, clear it.

    Also, what is your recovery mode set to? Is the NR bit set or cleared? Is the ASCC bit set in the non-removable cfg register? What is your current recovery time set to?

    thanks

    Onyx