Earlier today i changed the value of the shunt resistor of my LTC4150 coulomb counter from 0.05 ohm to 0.5 ohm to get more precise readings.In the datasheet it was specified that voltage drop of the shunt resistor should not be above 50mV for proper operation, with that in mind, i connected an appropriate resistor as my load to limit the current wihtin this restriction .
Since my Vin is 7.4v i picked 10kΩ to be on the safe side and to test my expected, low current resolution.
Oddly enough the board stopped producing interrupts. It used to signal low everytime some amount of charge(Depending on shunt resistor and voltage to frequency gain)have passed and it still remained broken even after i reverted the resistor change i made earlier .After a series of unsuccessful repair attempts (i even changed the IC with a brand new one to no avail.), i decided to check the resistance value of each resistor on the board with the help of the product schematic.
When i measured the resistances with a multimeter i saw that both of the 75k SMD resistors were at 39k (85C), while both of the 47k resistors were 0,01 ohms(473). 3.3k resistors were doing okey but all of the resistors except 47ks failed the continuity test .Do you think the reason i got inaccurate readings is that i didnt dismantle the components from the board ? Or what does failing continuity test while still having correct resistance mean for a resistor ? Have a nice day people :)
Edit : I removed the resistors from the circuit and it looks like they are not the cause of my problem.Interrupt pin of my IC is an open-drain output , its is supposed to provide me with a high signal whenever (which i will see as low since it's open drain) a certain amaount of charge has passed.Even after ı changed the IC still does not work. I am not asking for a direct solution but rather an approach to what to look for next in my troubleshooting scenario