I have designed a project that includes a TP4056 with DW01 protection ic and porwer sharing feature. Now I want to include a fuel gauge and the only one I have found is MAX17048 I have readed the MAX17048 datasheet ant it shows you should connect GND and CTG pins to GND but I have 2 different "grounds" one the BAT- pin and the other one is the "real" common GND.
I don't know which one should I use because if I use the BAT- then may be a problem when I interface it with the uC because ground isn't the same, but it I connect it to GND I don't know if it will measure the real battery level. Which one should I use and why (if possible)?
Thanks in advance for your help!
PS: I'm sorry if my english is'nt good enough I have done my best.