Some questions of fuel gauges

Hi SS,

Thanks for the interest in our gauges. Please see my response below.

SS Jung said:

1. IT fuel gauges

q1) What is Learning cycle? Why this is necessary? Learning cycle is a series of two charge and discharge cycle with period of relaxation at the end of charge and discharge. This enables the gauge to learn the profile of the cells.

q2) If I know CHEM ID, learning cycle is not necessary? Yes it's still recommended to do the learning cycle and submit the data to TI GPC tool to find the best chem ID match. Even if you know the chem ID, sometimes cell chemistry is tweaked for improvement like deeper discharge voltage, etc. You need to know the best chem ID match to ensure the IT gauge makes accurate prediction of cell impedance, capacity and state of charge. 

q3) If I use single cell, learning cycle is not necessary? Learning is required for single and multi-cell batteries.

q4) User Parameter and CHEM ID write -> learning cycle -> Calibration -> Mass production. This sequence is right? No, it should be User parameters and battery specs >> Calibration >> Learning cycle >> Update Chem ID >> Optimization/learning cycle >> Create golden image files >> Mass production