Manuali utente per SMSC USB2512i

Sommario

• Chapter 1 Pin Configuration

  6
  • Figure 1.1 USB2512i 36-Pin QFN (Embedded Footprint)

    6
• Chapter 2 Block Diagram

  7
  • Figure 2.1 USB2512i Block Diagram

    7
• Chapter 3 Pin Descriptions

  8
  • 3.1 PIN Descriptions

    8
    • Table 3.1 USB2512i Pin Descriptions

      8
    • Table 3.2 SMBus or EEPROM Interface Behavior

      10
    • Table 3.3 USB2512i Power, Ground, and No Connect

      11
  • 3.2 Buffer Type Descriptions

    12
    • Table 3.4 USB2512i Buffer Type Descriptions

      12
• Chapter 4 Configuration Options

  13
  • 4.1 2-Port Hub

    13
    • 4.1.1 Hub Configuration Options

      13
    • 4.1.2 VBus Detect

      13
  • 4.2 EEPROM Interface

    13
    • 4.2.1 Internal Register Set (Common to EEPROM and SMBus)

      13
      • Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map

        13
      • Table 4.2 Port Remap Register for Ports 1 & 2

        23
    • 4.2.2 I2C EEPROM

      24
    • 4.2.3 In-Circuit EEPROM Programming

      25
  • 4.3 SMBus Slave Interface

    25
    • 4.3.1 Bus Protocols

      25
      • Figure 4.1 Block Write

        26
      • Figure 4.2 Block Read

        26
    • 4.3.2 Invalid Protocol Response Behavior

      26
    • 4.3.3 General Call Address Response

      26
    • 4.3.4 Slave Device Time-Out

      26
    • 4.3.5 Stretching the SCLK Signal

      27
    • 4.3.6 SMBus Timing

      27
    • 4.3.7 Bus Reset Sequence

      27
    • 4.3.8 SMBus Alert Response Address

      27
  • 4.4 Default Configuration Option:

    27
  • 4.5 Default Strapping Options:

    27
  • 4.6 Reset

    27
    • 4.6.1 Internal POR Hardware Reset

      27
    • 4.6.2 External Hardware RESET_N

      28
      • Figure 4.3 Reset_N Timing for Default/Strap Option Mode

        28
      • Table 4.3 Reset_N Timing for Default/Strap Option Mode

        28
      • Figure 4.4 Reset_N Timing for EEPROM Mode

        29
      • Table 4.4 Reset_N Timing for EEPROM Mode

        29
      • Figure 4.5 Reset_N Timing for SMBus Mode

        30
      • Table 4.5 Reset_N Timing for SMBus Mode

        30
    • 4.6.3 USB Bus Reset

      30
• Chapter 5 DC Parameters

  32
  • 5.1 Maximum Guaranteed Ratings

    32
  • 5.2 Recommended Operating Conditions

    32
    • Table 5.1 DC Electrical Characteristics

      33
    • Table 5.2 Pin Capacitance

      35
• Chapter 6 AC Specifications

  36
  • 6.1 Oscillator/Clock

    36
    • Figure 6.1 Typical Crystal Circuit

      36
    • Figure 6.2 Formula to find value of C1 and C2

      36
    • 6.1.1 SMBus Interface:

      36
    • 6.1.2 I2C EEPROM:

      36
    • 6.1.3 USB 2.0

      36
• Chapter 7 Package Outline

  37
  • Figure 7.1 36-Pin QFN, 6x6mm Body, 0.5mm Pitch

    37