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iPhone audio circuit repairing

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This video mainly explains the meaning of common terms in iPhone audio circuit

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In the different models of iPhone, common terms in audio circuits are basically the same

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After understanding the meaning of terms, it is convenient for us to search the diagrams,

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and we can better understand the working principle of the chip

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Common terms for audio circuits are as follows

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AUDIO refers to audio, or big audio

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CODEC generally refers to audio codec,

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and actually refers to a large audio chip

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ARC refers to the signal of the earpiece

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MIC means microphone

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SPKRAMP means loudspeaker

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FROM represents the starting point

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BIAS stands for error

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FILTP stands for filtering

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LOWER represents the bottom

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PDM stands for handset data transfer bus

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SPI refers to the peripheral data transmission bus

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I2S refers to the built-in audio data transmission bus

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Let's identify common audio terms in the drawings

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For example, we opened the iPhone 12 ProMax schematic

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This is the audio circuit page, and the AUDIO CODEC is marked on it,

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which means the audio codec

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The content is mainly about the signal of the audio circuit

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For example, the line name identifies PP1V8_AUDIO_VA_S2,

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which represents the 1.8V power supply of audio

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For example, the line identifies PP_CODEC_TO_MIC_LOWER_BIAS,

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it represents the bias power supply from the audio codec chip to the bottom microphone

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In the current page, we can see that there are some other signals inside the audio chip,

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such as SPI

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The SPI bus of the audio chip is used by the CPU to detect the large audio chip

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The I2S logo represents the audio data transmission bus inside the big audio

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Ok, that's all for this video