SLLSEZ6C February   2019  – October 2020 TUSB216


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  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
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 High-speed Boost
      2. 7.3.2 RX Sensitivity
    4. 7.4 Device Functional Modes
      1. 7.4.1 Low-speed (LS) Mode
      2. 7.4.2 Full-speed (FS) Mode
      3. 7.4.3 High-speed (HS) Mode
      4. 7.4.4 High-speed Downstream Port Electrical Compliance Test Mode
      5. 7.4.5 Shutdown Mode
      6. 7.4.6 I2C Mode
      7. 7.4.7 BC 1.2 Battery Charging Controller
    5. 7.5 TUSB216 Registers
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. Test Procedure to Construct USB High-speed Eye Diagram
          1. For a Host Side Application
          2. For a Device Side Application
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

Detailed Design Procedure

The ideal BOOST setting is dependent upon the signal chain loss characteristics of the target platform. The recommendation is to start with BOOST level 0, and then increment to BOOST level 1, and so on. if permissible. Same applies to the RX sensitivity setting where it is recommended to plan for the required pads or connections to change boost settings, but to start with RX sensitivity level 1.

In order for the TUSB216 to recognize any change to the BOOST setting, the RSTN pin must be toggled. This is because the BOOST pin is latched on power up and the pin is ignored thereafter.


The TUSB216 compensates for extra attenuation in the signal path according to the configuration of the RX_SEN pin. This pin is not 5 V tolerant and therefore when selecting the highest RX sensitivity level, the voltage level at RX_SEN pin must be less than 3.6V.

Placement of the device is also dependent on the application goal. Table 8-4 summarizes our recommendations.

Table 8-4 Platform Placement Guideline
Pass USB Near End Mask at the receptacleClose to measurement point (connector)
Pass USB Far End Eye Mask at the plugClose to USB PHY
Cascade multiple TUSB216s to improve device enumerationMidway between each USB interconnect
Table 8-5 Table of Recommended Settings
BOOST and RX_SEN settings (1)for channel loss
Pre-channel cable length (Between USB PHY and TUSB216)BOOSTRX_SEN
0-3 meterLevel 0Medium or High
2-5 meterLevel 1Medium or High
Post-channel cable length (Between TUSB216 and inter-connect)BOOSTRX_SEN
0-2 meterLevel 0Medium or High
1-4 meterLevel 1Medium or High
These parameters are starting values for different cable lengths. Further tuning might be required based on specific host and/or device as well as cable length and loss profile.