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- Q7236366 subject Q6046437.
- Q7236366 subject Q8592709.
- Q7236366 abstract "The Power Management Unit (PMU) is a microcontroller that governs power functions of digital platforms. This microchip has many similar components to the average computer, including firmware and software, memory, a CPU, input/output functions, timers to measure intervals of time, as well as analog to digital converters to measure the voltages of the main battery or power source of the computer. The PMU is one of the few items to remain active even when the computer is completely shut down, powered by the backup battery.For portable computers, the PMU is responsible for coordinating many functions, including:Monitoring power connections and battery chargesCharging batteries when necessaryControlling power to other integrated circuitsShutting down unnecessary system components when they are left idleControlling sleep and power functions (on and off)Managing the interface for built in keypad and trackpads on portable computersRegulating the real-time clock (RTC)The PMU controls almost every power-consuming function in an Apple computer. It is constantly running diagnostics on the various power-related operations and checking them against the current Energy-Saver settings, allowing the PMU to actively manage power consumption for optimum user performance.The PMUs functions may become corrupt over time. If this happens, it may become unresponsive and stop performing tasks. The user may not notice the PMUs malfunctions so much as the side effects of the corruption, including but not limited to:Failure to turn onFailure to restore from sleep modeFailure to recognize connected devices (FireWire, USB, etc.)Resetting the PMU in these circumstances can be a relatively quick and easy fix to some of these issues. There is a keyboard shortcut on newer Apple laptops with an internal battery, nicknamed "SCOP". This stands for Shift Control Option Power. This "reboots" the PMU software in order to get it working as it should. For Apple laptops with a removable battery, resetting the PMU involves unplugging the power adapter, disconnecting the battery, then holding down the power button for five seconds. Another PMU-related fix would be to reset the logic board, where one removes the backup battery on the board for a few minutes, then reinstalls it, causing the PMU to reset itself with clean, fresh parameters (that need to be corrected, if desired, to its previous state) during the next Mac OS boot (for typical PC users, this is similar to "resetting the CMOS").The PMU is very sensitive and a reset may be necessary if a backup battery dies. Even plugging in one's laptop in the wrong order can cause issues (power into the outlet first, THEN power to the computer). Never turn off an attached UPS without first unplugging the AC adapter.".
- Q7236366 wikiPageExternalLink HT3964.
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- Q7236366 wikiPageWikiLink Q6046437.
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- Q7236366 wikiPageWikiLink Q7236367.
- Q7236366 wikiPageWikiLink Q7397.
- Q7236366 wikiPageWikiLink Q7663661.
- Q7236366 wikiPageWikiLink Q80831.
- Q7236366 wikiPageWikiLink Q8592709.
- Q7236366 wikiPageWikiLink Q862594.
- Q7236366 comment "The Power Management Unit (PMU) is a microcontroller that governs power functions of digital platforms. This microchip has many similar components to the average computer, including firmware and software, memory, a CPU, input/output functions, timers to measure intervals of time, as well as analog to digital converters to measure the voltages of the main battery or power source of the computer.".
- Q7236366 label "Power Management Unit".