BQ40Z50-R2: Power management forum

pascal Messier

Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: EV2400, BQSTUDIO

Hi,

I am currently designing a device using the BQ40Z50-R2 with a 2 series cell battery. I am a bit lost in the large number of registers hat the IC have and I want to know if it exists a simple Quick start Guide to program to the basic function of the IC with the SMBUS

Currently, I am able to read voltage temperature and current. But I am unable to activate the LED display. Which registers that I need to configure?

I am using the BQ40Z50EMV for development

Thanks a lot

Pascal

over 5 years ago

0 Andy Liu (BMS) over 5 years ago

TI__Guru 52115 points

Hi Pascal,

Basically, you can most of the details in the TRM below. For example, see Section 8 for the details of the LED display.

http://www.ti.com/lit/ug/sluubk0b/sluubk0b.pdf

Note that in order for this gauge device to perform properly, a Chem ID that suits the battery you are using needs to be selected and also a learning cycle will be run.

Andy

0 pascal Messier over 5 years ago in reply to Andy Liu (BMS)

Prodigy 30 points

Hi Andy

Thanks for the answer

I configure the Chem ID with the right cell and the DA Configuration register for 2 cells. I achieve to make the LED toggle but SoC is still 0% in the absolute and Relative register.

Gauging is enable

Do I need to put a load to initiate a discharge to get SoC values?

Thanks

0 Kang Kang over 5 years ago in reply to pascal Messier

TI__Mastermind 24870 points

Hello Pascal,

No, make sure you are sending the GAUGE_EN command.

0 pascal Messier over 5 years ago in reply to Kang Kang

Prodigy 30 points

The Gauging is now enable but I get a Relative SOC of 100% and an Absolute SOC of 0%.

I use BQstudio with EV2400

0 Andy Liu (BMS) over 5 years ago in reply to pascal Messier

TI__Guru 52115 points

Hello Pascal,

In order for a gauge to report an accurate RSOC, you need to perform a learning cycle. See the details.

http://www.ti.com/lit/an/slua903/slua903.pdf

Andy