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iPhone trigger circuit

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In this video, we're going to learn how the trigger circuit of iPhone 7 and above works

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The trigger circuit works the same way on iPhone7 and above

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The difference between them is the way the main power supply is converted

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For a more detailed look at how the main power switch works,

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check out the video on the iPhone's standby circuit

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Step 1, when we connect the battery or adjustable power supply,

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the main power supply will be generated,

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and the main power supply will provide the operating voltage for the power IC

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Step 2, after the main power supply,

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it will generate standby power supply PP1V8_ALWAYS

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Step 3, after the standby power is generated from the main power supply,

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it will provide a pull-up voltage to the switch pin through the chip

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The pull-up voltage of iPhone 7- X models is 1.8V,

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and the pull-up voltage of 11 series and above models is about 1.5V

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Step 4, when we short switch,

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the switch pin voltage will change from 1.8V to 0V

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This is a switch signal

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This signal is sent to the main power supply

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After receiving the power-on signal,

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the main power supply converts the power-on signal to the CPU to wake up the CPU and start working

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After the main power has converted the power signal,

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it will generate power supply

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The power supply IC output provides the operating voltage for many chips

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At this point, the current will be displayed on the adjustable power supply

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If it doesn't trigger, we need to start with the main power supply, standby power supply,

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switch pin signal, power signal, and CPU

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If something goes wrong in any of these places,

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it will not trigger

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Ok, that's it for this lesson