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Power Management Unit

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This is an old revision of this page, as edited by 73.1.229.198 (talk) at 11:05, 6 September 2019 (Removed Apple PMU section as it was confusing and too specific to a single brand. If it is notable it should have it's own entry separate from the generic PMU page. Also, Wikipedia is not a manual so the instructions section is inappropriate.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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, and 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 charges
  • Charging batteries when necessary
  • Controlling power to other integrated circuits
  • Shutting down unnecessary system components when they are left idle
  • Controlling sleep and power functions (on and off)
  • Managing the interface for built in keypad and trackpads on portable computers
  • Regulating the real-time clock (RTC)

See also

References

  • "Desktop and Portable Systems: Second Edition" Edited by Owen W. Linzmayer ISBN 0-321-33546-5

External links

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