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iPhone trigger circuit

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In this lesson, we mainly measure the standby power supply PP1V8_ALWAYS

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and switching pin voltage of iPhone 6

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From the iphone 6 to the iphone 6SP, the principle is the same

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Last time we learned that when the main power supply has the main power supply,

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the standby power supply will be generated

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The power supply is generated when we switch on the adjustable power supply

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Now, let's go and measure it in the actual mainboard

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We first select the search signal in the bitmap and search PP1V8_ALWAYS

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The location of the yellow dot in the bitmap allows us to measure the voltage

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After the mainboard buckles the boot cable,

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we measure PP1V8_ALWAYS in reverse

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According to the bitmap,

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we find the measuring position and we can see that the voltage is 1.78V

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This voltage is the standby power supply after connecting the power line

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In actual measurement, the measuring point is inside the shield

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We can cut the shield off,

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Standby supply provides voltage to the switch pin through a pull-up resistor

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Now let's measure the voltage of the switch pin

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We found the switch pin according to the picture of the short contact on the iPhone 6

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In the mainboard, the first pin above the connecting seat represents the switch pin

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When the mainboard is energized,

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the switch pin will have voltage, let's measure it

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We can see that the switch pin voltage is about 1.75V

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When we connect the power line, it has this to power it

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Ok, that's it for this lesson