Dear all,
I come again here before starting my design. I already gave valuable answers to my questions and I would like to thank you again.
So, I will start designing a module with a 1-cell Li-ion (maybe Li-Po) which can be charged and have a fuel gauge to display the state of charge on LEDs. This device will not have any uC/uP, that is why I have to choose carefully the gas gauge in order to have good user experience despite we do not have uC/uP.
Someone from TI already told my that I can use the BQ34Z100-G1 without uC with less features. After checking again, the BQ4050 might also meet my specification.
I have some questions:
- What is the diffence between "implentation: pack or system" when I see device in the list: http://www.ti.com/lsds/ti/power-management/battery-fuel-gauge-products.page#p2192=Battery%20Management%20Unit ?
- Can the BQ4050 also be used without uC (with less feature) like the BQ34Z100-G1 ?
- The BQ4050 acts also as protection. So, would it be useful to have a second protection such as BQ297xx if the BQ4050 fails ?
- If I use the BQ4050, is it mandatory to put a button to display the state of charge? I read that I need to give a high-to-low transition to this pin, but is it possible to have LED permanetly lit ? If no, I also see I can have a flash option when battery is almost empty, is it only to flash LED instead of putting ON? I am talking about the SLUUAQ3 document, section 8.1. It would be nice to inform the user that the battery is almost empty without pressing on a button...
- Finally, if I understand correctly, with the BQ4050, only one LED is turned ON to indicate the state of charge? Because, when I see the LED schematic, it is impossible to turn on some LED together since they are anti-parallel.
Sorry for the long post and thank you in advance. It is my first battery charger design.
Best regards,
Christian