Desktop Motherboard Power Sequence Pdf Now

1. Core Concept – Motherboard Power-On Sequence (Simplified)

The power sequence ensures voltages come up in a specific order to prevent latch-up or damage to chipsets, CPU, and RAM.

Power Trigger: The user presses the power button, sending a signal to the SIO. desktop motherboard power sequence pdf

Main Power Activation: SIO sends the PSON signal to the Power Supply Unit (PSU) to turn on all main rails. desktop motherboard power sequence pdf

PSOUT / PWRBTN#: The SIO then "taps" the PCH by sending a corresponding signal to notify it that a power request has been made. desktop motherboard power sequence pdf