BQ2973: Would like a better understanding of the NC pin with second source selection in mind

Southern Engineering

Part Number: BQ2973

Hi,

We are considering to use BQ29737DSER in an existing design, but the main track would currently ground the pin that is defined as "NC" for the BQ29737DSER. The BQ29737DSER datasheet states "No Connection (electrically open, do not connect to BAT or VSS)".

It is in other words clear the NC pin should not be grounded, but left open. Still, we are curious about this detail:
- Is it correct to understand that the pin description means "leave electrically open", not that the pin is electrically open (internally)?

Thanks!

7 months ago

0 Maxwell Verboncoeur 7 months ago

TI__Genius 17800 points

Hi,

The pin is not internally connected to anything, so it should be fine to connect it to VSS.

It looks like the instructions to not connect to VSS or BAT are a typo and I've made a note for it to be fixed in the next revision.

Regards,

Max Verboncoeur

0 Southern Engineering 7 months ago in reply to Maxwell Verboncoeur

Intellectual 665 points

Hi,

Sounds like a good thing I asked then. Because if that is the case it could actually save us a lot of effort.

Could I use this information now as-is, or is there additional checks you need to do to really confirm the pin can be connected to VSS (the same potential as the pin 4)?

Thanks!

+1 Maxwell Verboncoeur 7 months ago in reply to Southern Engineering

TI__Genius 17800 points

Hi,

I confirmed with the design team that the pin is not internally bonded, so you can move forward with grounding the pin with no risks.

Regards,

Max Verboncoeur

Power management

Power management forum

BQ2973: Would like a better understanding of the NC pin with second source selection in mind