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BQ79616: Base Chip Wiring of VC and CB Inputs

Andrew Fillingim

Prodigy 30 points

Part Number: BQ79616

Tool/software:

In our system, we use a base chip that is powered by our LV system to communicate with the HV boards. Right now our LV is 12-14V and powers the base chip. We are looking to move to use this board for a 24V application and had some questions on how to wire the VC and CB pins since they are unused.

How should VC and CB inputs be wired for the base chip for a 24V application?
1. For the 12V application VC1-16 and CB1-16 are all tied to 12V which is BAT
Can we use this same approach for 24V?
1. My concern is that the ratings for CB[n] - CB[n-1] is 16V

0 Luis H. S. 6 months ago

TI__Mastermind 42060 points

Hello Andrew,

Why are you trying to do this type of set-up with this device? If you need a bridge device, you could use the BQ79600.

Yes the CB abs max is definitely a danger and that could cause issues.

Best Regards,

Luis Hernandez Salomon

0 Andrew Fillingim 6 months ago in reply to Luis H. S.

Prodigy 30 points

Hey Luis,

The BQ79616 was used as a base chip in this design instead of the BQ79600 because the BQ79600 was backordered by >1year at the time.

Would it be possible to leave the CB pins floating in the case above?

Thanks,

Andrew

0 Luis H. S. 6 months ago in reply to Andrew Fillingim

TI__Mastermind 42060 points

Hello Andrew,

No, it would not be possible to leave the CB pins floating. Even when unused it is recommended to have a capacitor for every single CB pin.

Best Regards,

Luis Hernandez Salomon