Interpreting the Open-Circuit-Voltage (OCV) Fuel Gauge of the DS2786
The DS2786 is an open-circuit-voltage (OCV) based fuel gauge that reports the total energy that is stored in a Li+ cell. The OCV is a good indicator of the stored energy in a Li+ cell over normal operating temperatures. However, because the impedance of the cell varies with temperature, the amount of energy that can actually be delivered to the application will differ from the energy that is stored in the cell. This application note describes how to enhance the DS2786’s OCV-based fuel gauge to accurately estimate the amount of energy that can be delivered to an application over various temperatures and loads.
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