BQ40Z50: Retrieving data from a fuel gauge

Sergio Mendoza

Part Number: BQ40Z50
Other Parts Discussed in Thread: EV2400

Hi -

I have a battery management system board using a BQ40Z50, I am trying to read the data in the fuel gauge using BQ studio and both an EV2300 and an EV2400, but I cannot access the fuel gauge. There are 8 connectors out of the PCB 9 pins out of the board, but none is labeled. Is there a fast/reliable way to read the fuel gauge directly? perhaps removing it and putting in on a TI box?

Any help is appreciated.

Thanks

over 6 years ago

0 Batt over 6 years ago

TI__Mastermind 42535 points

To get access to the gauge, you will need access to the comm bus lines. If the gauge is sealed you can't access data memory, but you can still get data off the registers.

0 Sergio Mendoza over 6 years ago in reply to Batt

Prodigy 135 points

The battery connector has 9 different points. I don't have access to the schematics and I am not sure which connectors are the comm bus lines. Is there a way for me to determine which lines I need to connect to?

Thanks!

0 Batt over 6 years ago in reply to Sergio Mendoza

TI__Mastermind 42535 points

You need the SMBC, SMBD, Vss lines. See where those test points are and blue wire them. They should probably be labeled.

0 Sergio Mendoza over 6 years ago in reply to Batt

Prodigy 135 points

Does the chip need tp be energized? I currently have it on a pcb board that is not connected to a battery pack.

0 Batt over 6 years ago in reply to Sergio Mendoza

TI__Mastermind 42535 points

Yes, you need power to chip.

Power management

Power management forum

BQ40Z50: Retrieving data from a fuel gauge