• Learning center

    Index/
    145. Apple A2159 timing analysis- CPU Standby condition
    Today we will learn about the standby conditions of the CPU in the Apple A2159 circuit.
    93 person
    Collection
    Detail
    Comments

    1

    00:00:00,566 --> 00:00:06,666

    Hello everyone, today we will learn about the standby conditions of the CPU in the Apple A2159 circuit

    2

    00:00:09,166 --> 00:00:11,966

    This mainboard uses Intel's low-power CPU,

    3

    00:00:13,166 --> 00:00:16,066

    and its standby condition is provided by the power chip

    4

    00:00:18,066 --> 00:00:20,400

    Let's take a look at this timing diagram

    5

    00:00:21,666 --> 00:00:26,433

    When the power supply chip is powered by PP3V3_G3H_RTC,

    6

    00:00:28,066 --> 00:00:32,466

    it will output RTC power supply to the VCC_RTC pin of the CPU,

    7

    00:00:35,466 --> 00:00:38,766

    and then delay to provide it with an RTC standby clock

    8

    00:00:38,766 --> 00:00:44,466

    with a frequency of 32.768KHz to the RTCX1 pin of the CPU

    9

    00:00:50,800 --> 00:00:55,133

    The RTC power supply is provided by the LDO module inside the power chip

    10

    00:00:56,266 --> 00:00:58,233

    When the RTC power supply is normal,

    11

    00:00:59,100 --> 00:01:07,233

    the power chip will output LDO1_POK to the two reset pins of the CPU, RTCRST# and SRTCRST#

    12

    00:01:14,800 --> 00:01:18,033

    These are the four major conditions of the RTC circuit

    13

    00:01:18,433 --> 00:01:22,766

    When the power chip gets the main power supply from PP3V3_G3H,

    14

    00:01:23,100 --> 00:01:25,400

    its PWM circuit starts to work,

    15

    00:01:25,533 --> 00:01:30,400

    providing CPU with deep sleep standby power supply VCCDSW_3P3

    16

    00:01:30,400 --> 00:01:34,600

    and main standby power supply VCCPRIM_3P3,

    17

    00:01:35,966 --> 00:01:40,633

    and at the same time pulls up PCH_BATLOW_L

    18

    00:01:44,500 --> 00:01:48,966

    They are provided by PP3V3_S5 output by the power chip

    19

    00:01:50,500 --> 00:01:56,766

    Then it will provide it with 1.8V and 1.0V main standby power supply, and core power supply

    20

    00:01:59,666 --> 00:02:01,800

    After the standby power supply is normal,

    21

    00:02:02,200 --> 00:02:05,800

    the power chip will also provide standby power to the T2 chip

    22

    00:02:13,300 --> 00:02:21,966

    The T2 chip delays sending PM_RSMRST_L to the DSW_PWROK and RSMRST# pins of the CPU

    23

    00:02:30,366 --> 00:02:33,100

    Ok, this is the standby condition for the CPU

    No comments yet
    Come and write your comments
    Related recommendations
    1/1
    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：