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Hello everyone, today we will learn about the deep sleep standby main standby conditions

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of the Wistron 15221 motherboard.

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First, we have to learn how to tell if it supports deep sleep

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Usually we judge by three signals

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The first signal is the deep sleep standby power supply (VCCDSW_3P3)

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See if this power supply is connected to the main standby power supply (VCCPRIM_3P3)

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If these two power supplies are connected together,

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it means that the deep sleep standby power supply and the main standby power supply

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are generated at the same time

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Unity provided by 3D3V_S5

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This condition indicates that deep sleep is not supported

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The second signal is RSMRST#

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RSMRST# means the main standby power supply is good

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DSW_PWROK means that the deep sleep standby power supply is normal

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If these two signals are connected together, it also means that the machine does not support deep sleep

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There is another signal called SLP_SUS##

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This signal is used to turn on the main standby power supply,

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and it will only be used when deep sleep is supported.

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When this pin is floating, it means that deep sleep is not supported

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This mainboard does not support deep sleep

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Its deep sleep standby power supply is connected to the main standby power supply,

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and RSMRST# and DSW_PWROK are also connected together

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It means that this motherboard does not support deep sleep

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Both the deep sleep standby power supply and the main standby power supply come from 3D3V_S5

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There is also a VCCPRIM_1P0 main standby power supply 1.0V, which comes from 1D0V_S5

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Then the two main standby power supplies come from the standby power supply chip respectively.

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After the PU4501 (standby power supply chip) receives the start signal sent by the EC,

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it controls the output of 3D3V_S5 and 5V_S5

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Provides power to the deep-sleep standby and main standby supply pins of the bridge

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Simultaneously generate 3V5V_POK (power good signal) to turn on 1D0V_S5

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This 1D0V_S5 is generated by the control of PU5201

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So here are the 3 standby power supplies for this bridge

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When the 3.3V_S5 standby power supply is normal, it will pull up BATLOW#

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BATLOW# is a low battery indication signal, active low

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When this signal is low, it means that the battery is low, which will not trigger the fault

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When the power supply of 3D3V_S5 and 1D0V_S5 is normal,

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the EC delays sending a power good signal to the RSMRST# and DSW_PWROK pins of the bridge

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to notify the bridge that the standby power supply is normal

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We collectively refer to these conditions as the top ten standby conditions

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When these standby voltages are normal, the deep sleep standby power supply will internally

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pull up the PWRBTN# switch signal through a resistor

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So this PWRBTN# is also 3.3V high level in standby state

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If it is low, it will cause the machine to fail

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Ok, here are a few standby conditions for the bridge