Managing energy usage in mobile devices
摘要
說明書
In this example, system the lowest priority action is related to the clock speed of processor 101. Based on this prioritization, when the BATT_PWR_FACTOR exceeds a prescribed threshold, the first action taken by the power management process is to reduce the clock speed to the processor by 30% (Priority 1). If this is not adequate to bring the BATT_PWR_FACTOR down to an acceptable range, the backlight is blanked when scanning (Priority 2). If this is not adequate to bring the BATT_PWR_FACTOR down to an acceptable range, the scanner is disabled (Priority 3) and so on. These priorities may be user manipulated or factory set.
In this example, the BATT_PWR_FACTOR is computed by first reading the temperature, voltage, and current from battery monitor 202. TABLE 2 below shows example ranges of temperature, voltage and current for this example battery pack and factors T, V and I representing a figure of merit ranging from values of 1 to 8 for each. These values can be user manipulated or factory set.
