BQ27750: How to start work with BQ27750?

Spider

Part Number: BQ27750

Hello! I have custom design Cell protection boards for develop and I have EV2400. I installed BQStudio and downloaded 7802.1750_0_04-bq27750.bqz
What now? :))) Sorry.
Now FET is closed.
I can communicate with bq27750, but what I must do at minimum to Open FET?
I connected one cell 18650 Li-Ion.

Please help.

over 6 years ago

0 Onyx Ahiakwo over 6 years ago

TI__Guru* 76230 points

Hi Spider

Pls follow the instructions in the app note below. Though written for a different gauge, the bq28z610 and the bq27750 have similar hardware and firmware.
www.ti.com/.../slua777

thanks
Onyx

0 Spider over 6 years ago in reply to Onyx Ahiakwo

Intellectual 350 points

I don't know what I do wrong, but my BQ don't "open" key to power up my device from battery.
Can you show minimum configuration to make it work with one Li-ion 18650 battery?

0 Onyx Ahiakwo over 6 years ago in reply to Spider

TI__Guru* 76230 points

Hi
Is bqstudio able to automatically detect the device upon power up of the EVM? are you able to set up the evm following the evm user guide ?

The previous app note i attached describes the minimum that has to be done to use the EVM.

thanks
Onyx

0 Spider over 6 years ago in reply to Onyx Ahiakwo

Intellectual 350 points

Yes, bqstudio automatically detect my devices.
Yes, I configured (as I can understand) and look like work. But several devices don't open power key and several open but sometimes goes to "blink" mode - open and close key in circle mode.

0 Onyx Ahiakwo over 6 years ago in reply to Spider

TI__Guru* 76230 points

saying several devices go blink is very vague. You have to provide more for us to work with. Pictures of bqstudio when you say go "Blink". Measure the TS pin to make sure to see if it pulsing once every second... What voltage does the pbi pin measure? What is the voltage on the charge and discharge fet pins?

thanks
Onyx

Power management

Power management forum

BQ27750: How to start work with BQ27750?