SLLSFC5C November   2021  – January 2023 ISOUSB211

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  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  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Switching Characteristics
    11. 6.11 Insulation Characteristics Curves
    12. 6.12 Typical Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 Test Circuits
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Power Supply Options
      2. 8.3.2  Power Up
      3. 8.3.3  Symmetric Operation, Dual-Role Port and Role-Reversal
      4. 8.3.4  Connect and Speed Detection
      5. 8.3.5  Disconnect Detection
      6. 8.3.6  Reset
      7. 8.3.7  LS/FS Message Traffic
      8. 8.3.8  HS Message Traffic
      9. 8.3.9  Equalization and Pre-emphasis
      10. 8.3.10 L2 Power Management State (Suspend) and Resume
      11. 8.3.11 L1 Power Management State (Sleep) and Resume
      12. 8.3.12 HS Test Mode Support
      13. 8.3.13 CDP Advertising
    4. 8.4 Device Functional Modes
  10. 9 Power Supply Recommendations
  11. 10Application and Implementation
    1. 10.1 Typical Application
      1. 10.1.1 Isolated Host or Hub
      2. 10.1.2 Isolated Peripheral - Self-Powered
      3. 10.1.3 Isolated Peripheral - Bus-Powered
      4. 10.1.4 Application Curve
        1. 10.1.4.1 Insulation Lifetime
    2. 10.2 Meeting USB2.0 HS Eye-Diagram Specifications
    3. 10.3 Thermal Considerations
      1. 10.3.1 VBUS / V3P3V Power
      2. 10.3.2 VCCx / V1P8Vx Power
      3. 10.3.3 Example Configuration 1
      4. 10.3.4 Example Configuration 2
      5. 10.3.5 Example Configuration 3
  12. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Layout Example
      2. 11.1.2 PCB Material
  13. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  14. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Tape and Reel Information

10.1.3 Isolated Peripheral - Bus-Powered

Figure 10-3 shows an application for isolating a self-powered peripheral using ISOUSB211. In this example, an isolated DC-DC converter (for example: SN6505) is used to create a 3.3-V local supply while deriving power from the USB VBUS. On the microntroller 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 connecting the 3.3-V local 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 connected together connected to an external 1.8-V supply derived from VBUS. Please refer to Thermal ConsiderationsExample Configuration 3Thermal ConsiderationsVBUS / V3P3V PowerVCCx / V1P8Vx PowerExample Configuration 1Example Configuration 2Example Configuration 3 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, including any decoupling capacitors reflected from the secondary side through the isolated DC-DC converter, 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 connector to handle tranisent currents.

ESD diodes with low capacitance and low dynamic resistance, such as PESD5V0C1USF, may be placed on D+ and D- lines. A ferrite bead, with dc resistance less than 100 mΩ, may 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.

GUID-20200820-CA0I-FBXV-CWXP-PMFMPXRBVC7K-low.svg Figure 10-3 Isolated Bus-Powered Peripheral using ISOUSB211.