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iPhone 5 Power On Time Sequence











1) After a battery voltage of 3.8V inputs "PP_BATT_VCC" to U7 Pin E1, E2. (1st time voltage input to U7)





2) U7 combines with components: Y1, C276, C283 generates a clock signal of 32.768 Khz at U7 Pin P1, N1. U7 outputs a standby voltage of 1.8V "PP1V8_ALWAYS" at Pin P17.





3) Press the Power button or short out DZ1 triggers a digital signal 1.8V-0V-1.8V or "HOLD_KEY_L" at J2 Pin 9 which then goes to U7 Pin K6, an output voltage of 3.8V "PP_VCC_MAIN" at U7 Pin Q15 is generated.





4) "VCC_MAIN" inputs to a total of 9 pins on U48's VCC_MAIN module. They are A5, A7, A10, D11, H10, G10, K5, K3, K11. (2nd time voltage input to U48)









































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Source of all circuit diagram are from Apple's schematic. iPad, iPhone, iPod, Macbook are trademarks of Apple company.