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Hello everyone, today we will talk about light sleep standby conditions

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The light sleep standby state is also called the S5 state

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First, here are four conditions for light sleep standby

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The first is SLP_SUS#,

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which is used to turn on and off the main standby power supply

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This SLP_SUS# signal is not used when deep sleep is not supported

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If deep sleep is supported,

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the RTC circuit conditions are normal, and the standby power supply condition in deep sleep is normal

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When the chipset detects the adapter,

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it sends the SLP_SUS# signal to turn on the main standby power supply

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The first is VCCPRIM_3P3, which is the 3.3V standby power supply for PCH

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The second is VCCPRIM_1P0, which is the 1.0V primary standby power supply

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These are generated by PWM circuit control

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After the main standby power supply is normal,

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there will be a delay to generate a good signal of the main standby power supply, which is called RSMRST#

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This signal is also a reset signal for the ACPI controller inside the PCH

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The signal is 3.3V when the main standby power supply is normal

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Let's look at the block diagram of the light sleep standby condition

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Just now we said that when deep sleep standby conditions are normal,

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after detecting the adapter

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PCH will issue the SLP_SUS# signal to turn on the PWM circuit and control the 3.3V PWM output

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3.3V main standby power supply is provided to the main standby power supply pin of the PCH,

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and a good power signal is generated to the RSMRST# pin after a delay

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Some circuits will use their PG signal to turn on the next 1.0V standby supply after the 3.3V supply is normal

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This 1.0V PWM output will supply power to the VCCPRIM_1P0 pin of the PCH

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According to the standard timing diagram of Intel,

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the standby conditions of light sleep state include four conditions:

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light sleep standby power supply, deep sleep standby power supply, and RTC circuit