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BQ78350-R1: Documentation discrepancy

Anton Kanyshev
Prodigy 210 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: BQ76920, BQ76930, , BQ76940

Hello again.

My colleagues going to start a new project based on BQ78350-R1 and bq769x0 family. But suddenly there is a discrepancy of information about BQ78350-R1. As we can see at product filter at Battery Fuel Gauge category, BQ78350-R1 is compatible for> 4 power cells. Exactly more than 4 cells. But if we take a look at online datasheet and pdf version of it - we can see the following feature: "Flexible Configuration for 3- to 5-Series (bq76920), 6- to 10-Series (bq76930), and 9- to 15-Series (bq76940) Li-Ion and LiFePO4 Batteries ".

So problem lies here: How many cells does BQ78350-R1 truly support and why there is such discrepancy?

I'm attaching all needed screenshots to understand situation.

P.S. - also, about month ago I discovered cognate problem in BQ78350-R1 documentation. That one lies in disinformation about address compatibility of BQ78350-R1 and BQ769x0 family. I've been told, that this will be fixed, but I can't see changes. Here is topic of that problem on this forum.

Thanks for help

Anton Kanyshev

  • 0
    TI__Guru 73830 points

    Anton,

    The bq78350-R1 is a gauge that is used with an AFE to form a chipset to support the battery pack. The gauge can support a pack with 3 cells up to a pack with 15 cells and the user will select the appropriate AFE for the pack. The gauge does communicate with the AFE via an internal I2C bus and the AFE provides power to the gauge. The gauge only supports I2C address 0x08 and it must have a 2.5V supply voltage to operate. There are several AFE device options available to the user, so you will need to select one that will work with the gauge. The device options are listed in the options table in the AFE datasheet. The gauge will not work with the 0x18 I2C address option nor the 3.3V supply voltage option AFEs. These are offered to allow the use to use the AFE with a uC.

    Tom