• Learning center

    Index/
    89. Working principle of trigger circuit 2
    n this lesson, we will mainly explain the working principle of the trigger circuit of iPhone 6 to iPhone 6SP, and how to identify signals in the circuit diagram
    29 person
    Collection
    Detail
    Comments

    1

    00:00:01,000 --> 00:00:02,800

    iPhone trigger circuit

    2

    00:00:03,166 --> 00:00:06,400

    In this lesson, we will mainly explain the working principle

    3

    00:00:06,400 --> 00:00:09,666

    of the trigger circuit of iPhone 6 to iPhone 6SP,

    4

    00:00:09,766 --> 00:00:12,833

    and how to identify signals in the circuit diagram

    5

    00:00:13,333 --> 00:00:15,433

    In order for a main power supply to work,

    6

    00:00:15,766 --> 00:00:18,300

    it must first have a main power supply

    7

    00:00:18,800 --> 00:00:22,533

    This power supply is what we talked about in the previous lesson

    8

    00:00:24,500 --> 00:00:27,500

    In the schematic diagram, we can look for the signal,

    9

    00:00:27,766 --> 00:00:32,100

    just look for the standby power supply PP1V8_ALWAYS,

    10

    00:00:32,800 --> 00:00:35,433

    switch pin to the CPU and power line

    11

    00:00:40,233 --> 00:00:42,800

    Let's take the iPhone 6 as an example

    12

    00:00:43,300 --> 00:00:47,000

    and look at its standby power supply and the pin to power line

    13

    00:00:50,733 --> 00:00:57,066

    First of all, we open the component map, circuit diagram and bitmap of the iPhone 6

    14

    00:00:59,333 --> 00:01:01,800

    In the last video, we talked about that

    15

    00:01:01,800 --> 00:01:07,666

    the Apple's entire line of standby power is labeled PP1V8_ALWAYS

    16

    00:01:08,800 --> 00:01:13,133

    We simply type the name into the bitmap to find the standby power supply

    17

    00:01:15,700 --> 00:01:19,233

    We go to the search box, select the search signal,

    18

    00:01:21,400 --> 00:01:25,333

    type PP1V8_ALWAYS, and click Search

    19

    00:01:27,800 --> 00:01:33,266

    In the bitmap, we can see that this power supply is generated by the power supply IC,

    20

    00:01:35,133 --> 00:01:36,633

    one way to the CPU,

    21

    00:01:37,100 --> 00:01:41,333

    the other way through a resistor to supply power to the switch pins

    22

    00:01:43,766 --> 00:01:46,700

    The switch pin connects the CPU to the main power supply

    23

    00:01:46,700 --> 00:01:49,166

    and also connects a pull-up resistor

    24

    00:01:50,966 --> 00:01:52,333

    Now let's look it up

    25

    00:01:53,666 --> 00:01:56,966

    First, locate the switch connector in the component map,

    26

    00:01:57,833 --> 00:02:01,266

    and then search for the switch connector in the circuit diagram

    27

    00:02:03,066 --> 00:02:05,266

    After the switch socket is searched,

    28

    00:02:06,600 --> 00:02:11,866

    the English identifier of the iPhone 6 switch socket is BUTTON_HOLD_KEY,

    29

    00:02:14,133 --> 00:02:16,466

    according to its English abbreviation

    30

    00:02:16,800 --> 00:02:20,200

    In this seat, the second pin is the boot pin

    31

    00:02:22,033 --> 00:02:27,266

    In the circuit diagram, the switch pin will reach the power supply and CPU

    32

    00:02:31,366 --> 00:02:34,733

    After searching the circuit diagram for the name of the switch,

    33

    00:02:35,333 --> 00:02:40,300

    this signal is first connected to an inductor FL0809,

    34

    00:02:41,000 --> 00:02:44,466

    next to which an antistatic diode is connected

    35

    00:02:50,933 --> 00:02:56,566

    After passing the inductor, it will connect a capacitor C0810

    36

    00:02:57,533 --> 00:03:01,766

    After passing through the inductor, where does the signal connect to?

    37

    00:03:02,266 --> 00:03:04,966

    We need to search for the signal behind the inductor

    38

    00:03:07,933 --> 00:03:14,000

    After a search, we find that the signal is connected to a resistor, R0314

    39

    00:03:15,500 --> 00:03:20,300

    This resistor is connected to PP1V8_ALWAYS at one end

    40

    00:03:20,400 --> 00:03:22,333

    and a switch signal at the other

    41

    00:03:23,033 --> 00:03:25,666

    This resistor is the pull-up resistor

    42

    00:03:29,633 --> 00:03:34,533

    This signal is also connected to a chip, the U0201,

    43

    00:03:35,233 --> 00:03:37,266

    which is actually the CPU

    44

    00:03:39,400 --> 00:03:42,733

    This signal is also connected to the power IC

    45

    00:03:52,266 --> 00:03:55,266

    Let's look at number three in the search list

    46

    00:03:56,466 --> 00:04:00,966

    This signal comes in and is connected to the chip U1202,

    47

    00:04:01,500 --> 00:04:03,133

    which is the main power supply

    48

    00:04:05,933 --> 00:04:09,100

    In this way, we according to the circuit diagram,

    49

    00:04:09,500 --> 00:04:13,133

    the switch pin signals connected to the components are found

    50

    00:04:14,300 --> 00:04:16,500

    Ok, that's it for this lesson

    No comments yet
    Come and write your comments
    Video
    115. BIOS structure introduction
    ¥0.00
    38 people are learning
    Series of lessons
    LCD backlight screen circuit maintenance
    ¥0.00
    33 people are learning
    Video
    167. Intel 6th~9th Power supplies generation seque
    ¥0.00
    40 people are learning
    Video
    354. I2S bus from baseband to CPU of iPhone 12 12 Pro
    ¥0.00
    37 people are learning
    Video
    192. Network card introduction
    ¥0.00
    82 people are learning
    Next lesson
    Video
    Xinzhizao Download and Install Redemption Code Instructions
    0 people are learning
    Links：