LTC4015 ADC Readings

Hello, can you share your layout? Make sure charging is happening normally and not stopping/restarting. Look at the SW node on the scope as well as the charge current, if possible. Check if the charge status is flickering.

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Just to note out:
Below the coil is a plane empty polygon and the polygon is surrounded by a GND plane. 
The 2p5VCC cap is in the vicinity of the chip with a direct connection to the GND plane through 2 GND vias.

Just to note out:
Below the coil is a plane empty polygon and the polygon is surrounded by a GND plane. 
The 2p5VCC cap is in the vicinity of the chip with a direct connection to the GND plane through 2 GND vias.

The layout looks generally good and charging at 1A I wouldn't expect noise to interfere much. I do have some notes for your next revision:

- Remove thermal relief from switching components (inductor, caps, FETs)

- You should put GND directly below the inductor; we typically do this on layer 2.

Try suspending the charger and then reading the data.

Also, have you built up multiple boards? Please build at least 3 and determine if this issue happens on all of them. Otherwise there may just be some assembly issue.

Regards,
Zack

Thank you, Zack, 
I assembled the circuit on another PCB it worked like a charm. 
I wonder what might have been the problem because i moved the same components into another PCB it woked, might be a defect caused while assembling the circuit. 
One more question any reference documents that might help in using the Coulomb Counter to report SOC (state of charge), example code?  

Glad it is working now!

We do not really have any source code for this - we generally leave the SoC characterization up to the user.

You should characterize your battery's capacity and use the charge information along with the voltage (at temperature & current) to assist in determining SoC. And, of course, set the SoC to 100% when charging terminates normally.