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iPhone trigger circuit

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In this lesson, we will mainly explain the working principle of iPhone 6 to iPhone 6SP trigger circuit

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First of all, when we connect the battery or switch on the adjustable power supply,

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the battery power supply will generate the main power supply

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through the charging tube and the charging chip,

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and provide the working voltage for the power IC

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When the power IC has a main power supply,

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it will generate a standby power supply,

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one will provide the CPU standby working voltage,

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the other will provide a pull-up voltage to the switch pin through a resistor

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At this time, the voltage of the switch pin will become 1.8V

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When we short the switch pin,

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

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This signal is called the power on signal

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It goes one way to the CPU to wake it up,

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and the other way to the main power supply

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After receiving the switch signal, the power IC will output power supply

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The output of the power supply IC provides the operating voltage for the chip in the mainboard

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

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When we press the switch,

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if the adjustable power supply current does not jump,

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it means that the power supply may not be satisfied

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Second, it may be that the power supply is not generating standby power supply

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Third, it is possible that the switch pin signal is not sent to the power supply

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Fourth, it is possible that the power supply itself is damaged

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Fifth, it is possible that the CPU damage caused by the switch pin signal to pull down

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In the future, when there is no trigger fault,

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we need to check these five aspects

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So, that's it for this lesson