SLLSFC5D November   2021  – April 2025 ISOUSB211

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Power Ratings
    6. 5.6  Insulation Specifications
    7. 5.7  Safety-Related Certifications
    8. 5.8  Safety Limiting Values
    9. 5.9  Electrical Characteristics
    10. 5.10 Switching Characteristics
    11. 5.11 Insulation Characteristics Curves
    12. 5.12 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Test Circuits
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Power Supply Options
      2. 7.3.2  Power Up
      3. 7.3.3  Symmetric Operation, Dual-Role Port, and Role-Reversal
      4. 7.3.4  Connect and Speed Detection
      5. 7.3.5  Disconnect Detection
      6. 7.3.6  Reset
      7. 7.3.7  LS/FS Message Traffic
      8. 7.3.8  HS Message Traffic
      9. 7.3.9  Equalization and Pre-emphasis
      10. 7.3.10 L2 Power Management State (Suspend) and Resume
      11. 7.3.11 L1 Power Management State (Sleep) and Resume
      12. 7.3.12 HS Test Mode Support
      13. 7.3.13 CDP Advertising
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Typical Application
      1. 8.1.1 Isolated Host or Hub
      2. 8.1.2 Isolated Peripheral - Self-Powered
      3. 8.1.3 Isolated Peripheral - Bus-Powered
      4. 8.1.4 Application Curve
        1. 8.1.4.1 Insulation Lifetime
      5. 8.1.5 Meeting USB 2.0 HS Eye-Diagram Specifications
    2. 8.2 Thermal Considerations
      1. 8.2.1 VBUS / V3P3V Power
      2. 8.2.2 VCCx / V1P8Vx Power
      3. 8.2.3 Example Configuration 1
      4. 8.2.4 Example Configuration 2
      5. 8.2.5 Example Configuration 3
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Layout Example
        2. 8.4.1.2 PCB Material
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Tape and Reel Information

8.1.2 Isolated Peripheral - Self-Powered

Figure 8-2 shows an application for isolating a self-powered peripheral using ISOUSB211. In this example, on the microcontroller side, V3P3V2 and VBUS2 are together connected to an external 3.3-V supply. The V1P8V2 supply is generated using the internal 1.8-V LDO by providing 3.3-V supply to VCC1. On the connector side, the VBUS from the USB connector is connected to VBUS1 and the V3P3V1 supply is generated using the internal 3.3-V LDO. VCC1 and V1P8V1 are together connected to an external 1.8-V supply derived from VBUS. Please refer to Thermal Considerations for options on optimizing power dissipation inside ISOUSB211 as required.

Decoupling capacitors are placed next to ISOUSB211 according to the recommendations provided in the Power Supply Recommendations section. Note that the USB standard requires that, for a peripheral, the total capacitor value on VBUS must be less than 10-μF. However, a total of at least 5-µF capacitance is recommended on VBUS. A 100-nF capacitor is recommended close to the VBUS pin to handle transient currents.

ESD diodes with low capacitance and low dynamic resistance, such as PESD5V0C1USF, can be placed on D+ and D- lines. A ferrite bead, with DC resistance less than 100 mΩ, can be optionally placed between VBUS pin of the connector and the VBUS pin of ISOUSB211, as shown in the figure, to suppress transients such as ESD.

ISOUSB211 Isolated Self-Powered Peripheral With ISOUSB211 Figure 8-2 Isolated Self-Powered Peripheral With ISOUSB211