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BQ76PL455A-Q1: COMMH/L Lines

Alex Terry
Intellectual 625 points
Part Number: BQ76PL455A-Q1

Hi, 

In the datasheet for the BQ76PL455A-Q1 it recommends including TVS diodes on either side of the communication line for IC's on the same PCB, the centre of these diodes is both shown as grounded as in the picture below, should these be grounded the the GND of their individual IC's or should both be grounded the the lowest IC out of the 2?

Thanks,

Alex

  • 0
    TI__Genius 11480 points
    Hi Alex,

    This should be the local GND for the PCB. If you go to the lowest GND you will cross the isolation barrier provided by the 1nF capacitors.

    Also, you should use a TVS with the lowest possible capacitance to maintain signal integrity.