BQ34Z100: Bat- Pin and Pack- Pin

Nick Walsh

Prodigy 30 points

Part Number: BQ34Z100

What do I hook the Pack- pin and Bat - pin to? I have a multicell stack up and only have two inputs (Bat+ and Bat-).

over 4 years ago

0 Wyatt Keller over 4 years ago

TI__Guru** 105590 points

Hello Nick,

The two nodes are only separated by the gauge sense resistor. BAT- should be connected directly to the terminal. PACK- and PACK+ are used in your final system. You can reference the EVM schematic.

www.ti.com/.../sluu904

Sincerely,

Wyatt Keller

0 Nick Walsh over 4 years ago in reply to Wyatt Keller

Prodigy 30 points

So the Bat- comes in and goes through the sense resistor and that's how it connects to GND?

this also shows Bat- connected directly to GND (unless thats just shield) which is the part that makes it a little more confusing.

I am guessing that Bat- comes in and goes through the sense resistor and becomes the board GND or load GND, so Pack- = board GND???

+1 Jessica H. over 4 years ago in reply to Nick Walsh

TI__Genius 11535 points

Hi Nick,

The diagram in Section 2.2 EVM Connections of the EVM User's Guide explains the connections a little more clearly. You directly connect your battery cells to Bat- and Bat+. The charger and system load should be connected across BAT+ and PACK–.

Best,

Jessica

0 Nick Walsh over 4 years ago in reply to Jessica H.

Prodigy 30 points

thank you!

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BQ34Z100: Bat- Pin and Pack- Pin