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Original question:

BQ79656-Q1: BQ79656 Reverse Communication

BQ79656-Q1: Are VIF lines same as COMH/COML in BQ79656 Ring Architecture?

Vaishali Balakrishna Shetty
Prodigy 125 points
Part Number: BQ79656-Q1

Tool/software:

Hi,

I'm working with a BQ79656-based daisy chain in a ring architecture. Forward communication (DIR_SEL = 0) works well. But when I switch to  reverse communication (DIR_SEL = 1), I don’t get any response from the stack.

"It is outlined in the datasheet how to switch from north to south communication direction. It looks like you are doing this correctly. Do you have ring architecture set up correctly? Meaning do you have the VIF lines connected in the south direction?"

- Are the VIF lines (VIFP/VIFN) the same as COMH/COML? 

Thank you

  • 0
    TI__Intellectual 2050 points

    Hi Vaishali,

    The VIF lines are used to connect the COMH of one device to the COML of the next device. Vice Versa, COML of a device should be connected to the COMH of the device before it. When using reverse communication, ensure COML of the base is connected to the COMH of the device prior.

    VIFP/VIFN are the positive and negative of the VIF. So technically, COMHP of one device connects to COMLP of next device. COMHN to COMLN.

    Best Regards,

    John