SNLS757B June   2024  – November 2024 TUSB2E221

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Variants
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Timing Requirements
    8. 6.8 Typical Characteristics
  8. 7 Parametric Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 USB 2.0
      2. 8.3.2 eUSB2
      3. 8.3.3 Cross MUX
    4. 8.4 Device Functional Modes
      1. 8.4.1  Repeater Mode
      2. 8.4.2  Power-Down Mode
      3. 8.4.3  UART Mode
      4. 8.4.4  Auto-Resume ECR
      5. 8.4.5  L2 State Interrupt Modes
      6. 8.4.6  Attach Detect Interrupt Mode
      7. 8.4.7  GPIO Mode
        1. 8.4.7.1 EQ0 as GPIO0
        2. 8.4.7.2 EQ1 as GPIO1
        3. 8.4.7.3 EQ2/INT as GPIO2
      8. 8.4.8  CROSS
      9. 8.4.9  USB 2.0 High-Speed HOST Disconnect Detection
      10. 8.4.10 Frame Based Low Power Mode
    5. 8.5 Programming
      1. 8.5.1 I2C Target Interface
      2. 8.5.2 Register Access Protocol (RAP)
  10. 9 Register Map
    1. 9.1 TUSB2E221 Registers
  11. 10Applications and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application: Dual Port System
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 eUSB PHY Settings Recommendation
      3. 10.2.3 Application Curve
    3. 10.3 Power Supply Recommendations
      1. 10.3.1 Power-Up Reset
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Example Layout
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.4.9 USB 2.0 High-Speed HOST Disconnect Detection

USB 2.0 specification does not specify high-speed output differential swing VOD during disconnect without external load. Only chirp level and HS host disconnect threshold are specified. Specification implicitly assumes high-speed output differential swing VOD will double during disconnect. However, the high-speed output differential swing during disconnect depends on the USB 2.0 TX output swing and pre-emphasis setting, as the common-mode voltage increase can saturate the output swing level and may not double.

The high-speed host disconnect threshold can be adjusted to provide the most margin to avoid false disconnect as well as failure to detect a disconnect. See Table 8-3.

Table 8-3 Recommended USB 2.0 High-Speed HOST Disconnect Thresholds per USB HSTX Amplitude and Pre-Emphasis
USB HS TX Pre-Emphasis
USB HS TX Amplitude (Vp-p) 0.5dB (0h) 0.9dB (1h) 1.2dB (2h) 1.7dB (3h) 2.1dB (4h) 2.5dB (5h)
740mV (0h ) 545mV (1h) 545mV (1h) 545mV (1h) 545mV (1h) 545mV (1h) 545mV (1h)
760mV (1h ) 565mV (2h) 565mV (2h) 565mV (2h) 565mV (2h) 565mV (2h) 565mV (2h)
780mV (2h ) 585mV (3h) 585mV (3h) 585mV (3h) 585mV (3h) 585mV (3h) 585mV (3h)
800mV (3h ) 585mV (3h) 585mV (3h) 585mV (3h) 585mV (3h) 585mV (3h) 585mV (3h)
820mV (4h ) 605mV (4h) 605mV (4h) 605mV (4h) 605mV (4h) 605mV (4h) 605mV (4h)
840mV (5h ) 625mV (5h) 625mV (5h) 625mV (5h) 625mV (5h) 625mV (5h) 625mV (5h)
860mV (6h ) 645mV (6h) 645mV (6h) 645mV (6h) 645mV (6h) 625mV (5h) 625mV (5h)
880mV (7h ) 645mV (6h) 645mV (6h) 645mV (6h) 645mV (6h) 645mV (6h) 645mV (6h)
900mV (8h ) 665mV (7h) 665mV (7h) 665mV (7h) 665mV (7h) 665mV (7h) 645mV (6h)
920mV (9h ) 685mV (8h) 685mV (8h) 685mV (8h) 665mV (7h) 665mV (7h) 665mV (7h)
940mV (Ah ) 685mV (8h) 685mV (8h) 685mV (8h) 685mV (8h) 665mV (7h) 665mV (7h)
960mV (Bh ) 705mV (9h) 705mV (9h) 705mV (9h) 685mV (8h) 685mV (8h) 665mV (7h)
980mV (Ch ) 725mV (Ah) 705mV (9h) 705mV (9h) 705mV (9h) 685mV (8h) 685mV (8h)
1000mV (Dh ) 725mV (Ah) 725mV (Ah) 705mV (9h) 705mV (9h) 685mV (8h) 685mV (8h)
1020mV (Eh ) 725mV (Ah) 725mV (Ah) 725mV (Ah) 705mV (9h) 705mV (9h) 685mV (8h)
1040mV (Fh ) 745mV (Bh) 725mV (Ah) 725mV (Ah) 705mV (9h) 705mV (9h) 685mV (8h)