According to one exemplary embodiment, a synchronous power gauge is coupled to a processor for determining total charge consumed from a power source in an electronic device. The synchronous power gauge includes a controller for receiving a synch signal that indicates whether the electronic device is in an operating power mode or a low power mode. The synchronous power gauge further includes an analog to digital converter controlled by the controller and is configured to process a signal associated with current drawn from the power source when the electronic device is in the operating power mode. An accumulator coupled to the analog to digital converter maintains and updates a sum of digital outputs provided by the analog to digital converter when the electronic device is in the operating power mode. The processor uses the sum of digital outputs to determine the total charge consumed from the power source.
