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Terms explanation

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This video mainly demonstrates how to identify the power supply, ground wire

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and signal in the schematic diagram of different models

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First check the power supply, ground wire and signal identification in the schematic diagram of the Apple model

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For example, on the current page,

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the logo PP_VDD_MAIN represents power supply

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Some power supply lines will directly mark the supply voltage

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For example, PP3V0 means that the power supply is 3V,

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and PP1V8 means that the power supply is 1.8V

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Some power supplies will use VDD to identify inside the chip

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Let's check the ground

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For example, under the chip,

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the internal pin identification GND and PGND both represent the ground wire

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In addition to the power supply and ground wire,

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there are some English marks on the bottom left of the chip, such as these English marks refer to the signal line

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In Apple's drawings, the signal line is generally drawn thinner,

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and the power supply is generally drawn thicker

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Next, let's look at the power supply, ground wire

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and signal identification in Huawei's schematic diagram

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In the current page, the line name identifies VDD_CPU_B,

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VDD_CPU_M, and VDD_CPU_L

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These three logos belong to the power supply, and they all start with VDD

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The power supply mark of this road is VBUCK5_0V8,

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which means that the power supply voltage is 0.8V

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VOUT7_1V8 also represents the power supply,

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indicating that the power supply is 1.8V

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AVSS is marked inside the box on the current page,

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VSS represents the ground wire, and the entire page represents ground

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In the schematic diagram, except for the power supply and ground wires,

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they belong to the signal wires

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For example, in the current page, like CSI3_DATA0 belongs to the signal line,

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ISP_SDA2 belongs to the signal line

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The VDD mark represents the power supply

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Let's look at the power supply, ground wire

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and signal identification in the Xiaomi series schematic diagram

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For example, in the current page,

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if the power supply logo has VREG_L6E_RCM_1P8,

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it means that the power supply is a 1.8V power supply

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QET6100_VDD2, VDD also represents power supply

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In the lower corner of the chip,

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we can see that the internal identification of the pin is GND,

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and GND represents the ground wire

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In addition to the red power supply, this chip also has a ground wire

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Lines marked in gray represent signals

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Like SDR_PRX16, RF_N77_TRX_CH0,

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these are all signal lines

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Ok, that's it for this lesson