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iPhone trigger circuit

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In this video we're going to learn about the meanings of the terms involved in the trigger circuits

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Common terms of trigger circuits are PP1V8_ALWAYS,

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which refers to standby power supply

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This voltage is generated when we connect the power cord,

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and it basically provides the operating voltage for the switch

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That's the name for standby power throughout Apple's lineup

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Down below, BUTTON_HOLD_KEY,

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the term used in English for the switch pin,

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is used mainly in 6 to 6SP models

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BUTTON_POWER_KEY, which is also an English name for the switch pin,

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is used on the iPhone 7- XR models

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BUTTON_SIDE, also referred to as the switch pin,

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is used on the iPhone 11 and 12 series

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PMU_TO_AP_BUF_POWER_KEY,

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this is a power on signal from the main power supply to the CPU,

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which is only available on iPhone 7 and above models

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Earlier models before the 6SP did not have this signal

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Let's take the iPhone X model as an example to find the standby power supply

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In the drawing, we only need to enter the name of the standby power supply

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PP1V8_ALWAYS

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After a search, this power supply is standby

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This power supply is output by the U2700 main power supply

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Let's look at it in the bitmap

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The yellow spots in the bitmap belong to standby power supply

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Apple's full range of standby power, we can find this way

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Now let's take a look at the logo of the switch pin of iPhone X model in the drawing

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We first find the position number of the switch seat in the marked drawing,

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and then search the position number of the switch pin in the drawing

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After finding the switch pin,

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we can identify the switch pin according to the English abbreviation

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On iPhone X models, the pin identifier is BUTTON_POWER_KEY

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The ninth pin is labeled BUTTON_POWER_KEY,

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indicating that the ninth pin refers to the switch pin signal

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We can recognize in the bitmap that this pin is the switch pin

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When we connect this pin to the ground wire,

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it will trigger the boot

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Ok, that's it for this lesson