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BQ25856-Q1: VAC pins ambiguity

Nicolas Murguizur
Prodigy 210 points
Part Number: BQ25856-Q1

Tool/software:

Hi,

Reading the datasheet it states:

"Input Voltage Detection and Power – Connect a 1-µF capacitor from pin to PGND. Pin 33 is the input bias to power the IC, and ACOV/ACUV resistor divider should be connected relative to pin 33. When Reverse Mode is enabled, pin 32 is regulated to VAC_REV."

So it kinda implies that both signals have a different purpose yet the pin names are the same and thus the normal layout implementation will be to short them together. Since they are 0.5mm apart, electrically whatever noise or imperfections present in one pin will be equal in the other. 

Can you please confirm it's just fine to connect pins 32 and 33 together?

Regards

  • +1
    TI__Expert 6755 points

    Hi Nicolas,

    Pins 32 and 33 should be connected together. They do have different purposes, but that is more of an internal difference to the IC than anything else. They will both need to be connected to your board's input terminal anyway.

    Best,
    Michael