SLLSF93A June   2019  – January 2025 TUSB8042A

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Variants
    1. 4.1 Device Version Comparison
  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 Timing Requirements
    7. 6.7 Timing Diagrams
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Battery Charging Features
      2. 7.3.2 USB Power Management
      3. 7.3.3 One-Time Programmable (OTP) Configuration
      4. 7.3.4 Clock Generation
      5. 7.3.5 Crystal Requirements
      6. 7.3.6 Input Clock Requirements
      7. 7.3.7 Power-Up and Reset
    4. 7.4 Device Functional Modes
      1. 7.4.1 External Configuration Interface
      2. 7.4.2 I2C EEPROM Operation
      3. 7.4.3 Port Configuration
      4. 7.4.4 SMBus Target Operation
  9. 8 Register Maps
    1. 8.1  Configuration Registers
    2. 8.2  ROM Signature Register
    3. 8.3  Vendor ID LSB Register
    4. 8.4  Vendor ID MSB Register
    5. 8.5  Product ID LSB Register
    6. 8.6  Product ID MSB Register
    7. 8.7  Device Configuration Register
    8. 8.8  Battery Charging Support Register
    9. 8.9  Device Removable Configuration Register
    10. 8.10 Port Used Configuration Register
    11. 8.11 Device Configuration Register 2
    12. 8.12 USB 2.0 Port Polarity Control Register
    13. 8.13 UUID Registers
    14. 8.14 Language ID LSB Register
    15. 8.15 Language ID MSB Register
    16. 8.16 Serial Number String Length Register
    17. 8.17 Manufacturer String Length Register
    18. 8.18 Product String Length Register
    19. 8.19 Device Configuration Register 3
    20. 8.20 USB 2.0 Only Port Register
    21. 8.21 Serial Number String Registers
    22. 8.22 Manufacturer String Registers
    23. 8.23 Product String Registers
    24. 8.24 Additional Feature Configuration Register
    25. 8.25 SMBus Device Status and Command Register
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Discrete USB Hub Product
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Upstream Port Implementation
          2. 9.2.1.2.2 Downstream Port 1 Implementation
          3. 9.2.1.2.3 Downstream Port 2 Implementation
          4. 9.2.1.2.4 Downstream Port 3 Implementation
          5. 9.2.1.2.5 Downstream Port 4 Implementation
          6. 9.2.1.2.6 VBUS Power Switch Implementation
          7. 9.2.1.2.7 Clock, Reset, and Misc
          8. 9.2.1.2.8 TUSB8042A Power Implementation
        3. 9.2.1.3 Application Curves
    3. 9.3 Power Supply Recommendations
      1. 9.3.1 TUSB8042A Power Supply
      2. 9.3.2 Downstream Port Power
      3. 9.3.3 Ground
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 Placement
        2. 9.4.1.2 Package Specific
        3. 9.4.1.3 Differential Pairs
      2. 9.4.2 Layout Examples
        1. 9.4.2.1 Upstream Port
        2. 9.4.2.2 Downstream Port
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

3 Description

The TUSB8042A is a four-port USB 3.2 x1 Gen1 (5Gbps) hub. The device provides simultaneous SuperSpeed USB, high-speed, or full-speed connections on the upstream port. The device also provides SuperSpeed USB, high-speed, full-speed, or low-speed connections on the downstream port. When the upstream port is connected to an electrical environment that only supports high-speed, full-speed, or low-speed connections, SuperSpeed USB connectivity is disabled on the downstream ports.

When the upstream port is connected to an electrical environment that only supports full-speed or low-speed connections, SuperSpeed USB and high-speed connectivity are disabled on the downstream ports.

The TUSB8042A supports per port or ganged power switching and overcurrent protection, and supports battery charging applications.

An individually port power controlled hub switches power on or off to each downstream port as requested by the USB host. Also when an individually port power controlled hub senses an overcurrent event, only power to the affected downstream port is switched off.

A ganged hub switches on power for all the downstream ports when power is required for any port. The power to the downstream ports is not switched off unless all ports are in a state that allows power to be removed. Also when a ganged hub senses an overcurrent event, power to all downstream ports is switched off.

The TUSB8042A downstream ports provide support for battery charging applications by providing Battery Charging Downstream Port (CDP) handshaking support. The device also supports a Dedicated Charging Port (DCP) mode when the upstream port is not connected. The DCP mode supports USB devices which support with the USB Battery Charging, Galaxy Charging, and Chinese Telecommunications Industry Standard YD/T 1591-2009. In addition when upstream port is unconnected, the TUSB8042A supports the divider charging port modes (ACPx modes) and an automatic transition through all modes, starting with ACP3 and ending in DCP.

The TUSB8042A provides pin strap configuration for some features including battery-charging support, and also provides customization though OTP ROM, I2C EEPROM, or through an I2C/SMBus target interface for PID, VID, and custom port and phy configurations. Custom string support is also available when using an I2C EEPROM or the I2C/SMBus target interface.

The device is available in a 64-pin RGC package and is offered in a commercial version (TUSB8042A) for operation over the temperature range of 0°C to 70°C, and in an industrial version (TUSB8042AI) for operation over the temperature range of –40°C to 85°C.

Package Information
PART NUMBER(1)PACKAGEPACKAGE SIZE(2)
TUSB8042ARGC (VQFN, 64)9mm × 9mm
TUSB8042AIRGC (VQFN, 64)9mm × 9mm
(1) For all available packages, see Section 12.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
TUSB8042A DiagramDiagram