Shanghai SIMCom Wireless Solutions Limited 8PSA301 User Manuals

Table of Contents

• 1. SIM8905A Description

  3
  • 1.1. Summarize

    3
  • 1.2. Feature

    3
  • 1.3. Pin

    5
  • 1.4. Picture

    6
  • 1.5. Dimension

    7
• 2. Detail Block Diagram

  8
• 3. Interface Application

  8
  • Power Supply

    8
  • Power on/off

    10
    • Power on

      10
    • Power off

      11
  • VRTC

    11
  • Output Power Management

    12
  • USB Interface

    12
  • Linear Battery Charger

    13
    • Charging Control

      13
    • VBAT_SNS

      14
  • UART/SPI/I2C

    14
  • Secure Digital Interface

    15
  • Display Interface

    15
  • Touch Screen Interface

    16
  • Camera Interface

    17
  • Audio

    18
    • Microphone

      19
    • Headset

      20
    • Earpiece

      21
    • Speaker

      21
    • Microphone bias

      22
  • USIM Interface

    23
  • ADC

    24
  • Vibrator

    24
  • Antenna Interface

    25
    • MAIN Antenna reference circuit

      25
    • DRX Antenna reference circuit

      26
• PCB Layout

  27
  • Stack-up Options

    27
  • General Placement Guidelines

    27
  • PCB Layout Guideline Details

    27
  • RF Trace

    27
  • Power/GND

    27
  • USIM Card

    27
  • MIPI_DSI/CSI

    28
  • USB

    28
  • SDC Signal

    29
  • Audio

    29
• Electrical and Reliability

  31
  • Absolute Maximum Ratings

    31
  • Temperature Range

    31
  • Operating Voltage

    31
  • Digital-logic Characteristics

    32
  • PWRKEY Characteristics

    33
  • VRTC Characteristics

    33
  • Current Consumption (VBAT=3.9V)

    33
  • Electro-Static Discharge

    33
  • Module Operating Frequencies

    34
  • Module Output power

    34
  • Module Receiving Sensitivity

    35