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Today we are going to learn what is called PG signal

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PG is short for POWER GOOD

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The PG signal indicates that the power supply is good and describes that the power supply is normal

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It is generally active at high level

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For example, the power supply chip U8470,

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when it controls generating power, it produces a PG signal

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Common abbreviations for PG signal are PG

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There are also SYS_PWROK, PCH_PWROK, POK, PWRG, VCCST_PWRGD, PROCPWRGD, etc

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These are common PG signal identifiers in circuit diagrams

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There are two common PG signal voltages

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The PG signal output voltage of a chip similar to this supply is usually 3.3V

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The signal voltages of SYS_PWROK, PCH_PWROK and APWROK received by PCH are all 3.3V

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After the PCH receives these PG signals,

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the PG signal sent to the CPU is usually 1.05V

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Okay, so that's the PG signal