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BQ24650EVM-639: help in understanding use of VSYS

Part Number: BQ24650EVM-639

Hi!

I've been working with BQ24650EVM-639 and have successfully charged a battery with a couple of solar cells. I've even done the test suggested on the User's Guide and everything works as expected. My only doubt is regarding VSYS, I don't understand what is it's use. I would like to understand because on a project I'm working, I need to charge a battery AND at the same time, have 12V available for another part of the circuit, and I'm not sure if VSYS could be my solution. If it's not, I still think it's important to understand what is VSYS for. Thanks in advance!