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iPhone camera circuit repairing

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This video mainly explains the working principle of iPhone 12 and 12Pro wide-angle cameras

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Working principle step 1, when triggering the switch,

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after the camera power supply is in normal working condition,

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it will generate 1.8V power supply to provide the working voltage for the wide-angle camera

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Step 2, the camera power will detect the wide-angle camera through the I2C bus

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Step 3, after the camera power supply detects the wide-angle camera,

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it will send out a 24M clock signal for the camera

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Step 4, when starting up the camera circuit,

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the camera power supply first outputs PPVAR_AVDD2 to provide power for the wide-angle camera,

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and at the same time controls the camera conversion tube,

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so that the camera conversion tube outputs the PPVAR PVDD power supply of the wide-angle camera,

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and PP2V85 power supply, and PP1V1 power supply

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Step 5, the camera power supply sends an open signal to the wide-angle camera

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The working condition of the step 4 and step 5 will only last about 1 second during the startup process,

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and then the signal will be turned off

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After entering the system, when using the camera,

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then step 4 and step 5 working conditions will be issued

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The advantage of this design is that it can save power

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Step 6, when using the camera function,

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click the camera icon on the iPhone,

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the CPU will control the camera power supply,

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and let the camera power supply send the working conditions of the camera

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After the camera has working conditions, it starts to collect image information

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The camera will send the collected image information to the CPU through the LPDP bus

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After the CPU receives the data,

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it will display the information on the screen

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When we click the camera button,

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the CPU will intercept the current LPDP bus data

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and transfer it to the hard disk to complete the camera function

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When we click the recording function,

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the CPU will continuously transfer the LPDP bus data to the hard disk

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When we press stop, the CPU no longer collects LPDP bus data,

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and the video recording is completed

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In the functional block diagram, RCAM_TO_MANY_SYNC is the synchronization signal

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from the wide-angle camera to other cameras

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In the functional block diagram,

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steps 1-6 are the working conditions of the wide-angle camera

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If one is abnormal, it will cause the camera to fail to open

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That's all for this video