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BQ79616-Q1: what the VC pin current and short circuit protection

Yuan Tan63
Expert 3280 points
Part Number: BQ79616-Q1

hi team,

as titled, 

1.what the VC pin current range? it seems not list in datasheet.

2. when contact resistance get bigger, it may trigger false protection for short circuit, can it be avoided?

thank you

B&R

Yuan

  • 0
    TI__Intellectual 2280 points

    HI Yuan,

    Could you be more specific on these 2 question:

    1. For the VC pin current are you referring to the leakage current? If yes, the DS has spec Ivc around 8-12uA, Ivc_delta around 2uA(when ADC is on)

    2. Could you clarify further on the contact resistance and short circuit in the question? Are you referring to the cell cable or connector resistance? And for short circuit do you mean the VC short to CB fault? 

  • +1
    TI__Intellectual 2280 points

    HI Yuan,

    Per talk, you can configure different threshold properly to distinguish the VC short to CB fault from the cable/contactor shifting resistance fault. For example when fault VC short to CB pin, the voltage drop when enable the CB typically less than 50%.Take 10ohm CB resistance as example, 50% threshold means around minimum 20ohm contactor resistance shifting you'll be able to differentiate.

    P.s. Actually contactor/cable resistance needs to be shifting a lot to create mV level accuracy error due to very small pin leakage.