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BQ78350-R1: General Questions on BQ78350-R1

David Sandler
Intellectual 1910 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: BQ76930, BQ78350

Hi,

I have been looking at the BQ78350-R1 gas gauge and BMCC to interface with either the BQ76930 or 40 series monitor. So to my understanding both of these IC’s work together for their intended use.

 

I wanted to build a prototype pack consisting of 18650s, and 8-10 cells would be ideal. A ~30 V nominal pack around 3Ah capacity is what I wanted to build and qualify with. As far as management options have gone I decided to go with this series of controller and monitor after researching what I could find on the website.

 

I first wanted to ask about guidance in selecting the best IC’s to do the job, if you have any other recommendations besides what I have listed I would appreciate hearing your concerns.

 

Furthermore, both data sheets for the IC’s layout examples of applications. So I see a schematic of something that looks like it should work but maybe is not guaranteed? For example in the R1 spec sheet I see on page 15 and 16 values for discrete components, resistors, capacitors, diodes etc with listed values with a BOM listed as well. Are these the exact components I need to implement such a battery monitoring system or are these values purely examples and are only for reference? If this is how it is supposed to be done that makes ordering and PCB layout easy or does a much deeper design need to be done?

 

Also what is the use for an EVM? Is this a pcb that is laid out with the IC’s already on and I can plug and play into my battery pack and go through the whole learning procedure? Just wondering what the usefulness of the EVM is and why to justify purchasing one. Say once I use an EVM to qualify I can monitor a pack, what are the next steps? Go about a ground up PCB design for permanent use using the same IC’s?

 

Also, I see in a reference design at  http://www.ti.com/tool/tida-00792 there is a microcontroller as well. So is a microcontroller something I need on top of these IC’s in the full management system for multiple chips to talk or is the microcontroller just to program over I2C or whichever protocol?

Thanks,

David

  • 0
    TI__Guru* 76230 points
    Hi David,
    You can either use the bq78350 or the MCU for gauging. The bq76930 is an AFE that feeds V, I, T measurements to the gauge or MCU for processing to determine SOC of the battery and other fucntions. Most customers have all three on board the system with the MCU controlling other system functionality while the bq78350 does gauging and feeds the host with data.

    Pls review the user guide of both devices to determine what components are needed. The gauge EVMis useful for evaluating gauging accuracy, creating golden files which will be programmed on multiple units and generally is a guide for doing your own design and layout.

    Pls review our battery university pages on ti. com for further details on using the battery and gauges.

    www.ti.com/.../battery-management-products-support-training.page

    thanks
    Onyx