BQ78Z100: 2-s cell without middle point

Vladislav Blad

Prodigy 135 points

Part Number: BQ78Z100
Other Parts Discussed in Thread: BQ34Z100, BQ34Z100-G1

Hello!

I have a board with BQ78Z100, and a 2-s cell battery without middle point.

Would BQ78Z100 work correct if i connect the battery like this:

Thank you for answers.

over 7 years ago

0 Onyx Ahiakwo over 7 years ago

TI__Guru* 76230 points

No it will not. You will be exceeding the max of that pin. I suggest you use the bq34z100 OR

you use the bq27750 and an op amp as described in the attached app note.

2146.using 2s with a single cell gauge_slua496a.pdf

thanks

Onyx

0 Vladislav Blad over 7 years ago in reply to Onyx Ahiakwo

Prodigy 135 points

Hello! Thank you for answer.
The problem is i need a 1-wire interface for communicate, only bq78z100 have it.
Could i use voltage divider with op. amplifier like in your pdf for bq78z100?

0 -Terry over 7 years ago in reply to Vladislav Blad

TI__Expert 5090 points

The bq34z100-G1 includes 1-wire (HDQ) interface and will accommodate your divider-based gauging.

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BQ78Z100: 2-s cell without middle point