SLLSEV4 February   2017 TUSB319-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1 Cables, Adapters, and Direct Connect Devices
        1. 7.1.1.1 USB Type-C Receptacles and Plugs
        2. 7.1.1.2 USB Type-C Cables
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Downstream Facing Port (DFP) - Source
      2. 7.3.2 Type-C Current Mode
      3. 7.3.3 VBUS Detection
      4. 7.3.4 Cable Orientation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Unattached Mode
      2. 7.4.2 Active Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 DFP Mode
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
    3. 8.3 Initialization Set Up
  9. 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 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

7 Detailed Description

7.1 Overview

The USB Type-C ecosystem operates around a small form factor connector and cable that is flippable and reversible. Because of the nature of the connector, a scheme is needed to determine the connector orientation. Additional schemes are needed to determine when a USB port is attached and the acting role of the USB port (DFP, UFP), as well as to communicate Type-C current capabilities. These schemes are implemented over the CC pins according to the USB Type-C specifications. The TUSB319-Q1 device provides Configuration Channel (CC) logic for determining USB port attach and detach, cable orientation, and Type-C current mode for DFP applications.

7.1.1 Cables, Adapters, and Direct Connect Devices

Type-C Specifications defines several cables, plugs and receptacles to be used to attach ports. The TUSB319-Q1 device supports all cables, receptacles, and plugs. The device does not support e-marking.

7.1.1.1 USB Type-C Receptacles and Plugs

Below is list of Type-C receptacles and plugs supported by the device:

  • USB Type-C receptacle for USB2.0 and USB3.1 and full-featured platforms and devices
  • USB full-featured Type-C plug
  • USB2.0 Type-C plug

7.1.1.2 USB Type-C Cables

Below is a list of Type-C cables types supported by the device:

  • USB full-featured Type-C cable with USB3.1 full-featured plug
  • USB2.0 Type-C cable with USB2.0 plug
  • Captive cable with either a USB full-featured plug or USB2.0 plug

7.2 Functional Block Diagram

TUSB319-Q1 fbd_sllsev4.gif

7.3 Feature Description

Table 1. Supported Features for the TUSB319-Q1 Device by Mode

SUPPORTED FEATURES DFP
Port attach and detach Yes
Cable orientation Yes
Current advertisement Yes
Legacy cables Yes

7.3.1 Downstream Facing Port (DFP) - Source

The TUSB319-Q1 is a DFP device; it presents the appropriate Rp resistors on both CC pins, based on the state of the CURRENT_MODE pin to advertise the desired current level (USB-standard, 1.5 A and 3 A).

The TUSB319-Q1 can operate with older USB Type-C 1.0 devices except for a USB Type-C 1.0 DRP device. This limitation is a result of backwards compatibility problem between USB Type-C 1.1 DFP and a USB Type-C 1.0 DRP.

7.3.2 Type-C Current Mode

The TUSB319-Q1 device supports both advertising Type-C current by means of the CURRENT_MODE pin, which allows the CC controller to advertise 500 mA (for USB2.0) or 900 mA (for USB3.1) if CURRENT_MODE pin is left unconnected or pulled to GND. If a higher level of current is required, the CURRENT_MODE can be pulled up to VDD through a 500-kΩ resistor to advertise medium current at 1.5 A or pulled up to VDD through a 10-kΩ resistor to advertise high current at 3 A. Table 2 lists the Type-C current advertisements and detection.

Table 2. Type-C Current Advertisement and Detection

TYPE-C CURRENT CURRENT ADVERTISEMENT
Default 500 mA (USB2.0)
900 mA (USB3.1) 		CURRENT_MODE = L
Medium - 1.5 A CURRENT_MODE = M
High - 3 A CURRENT_MODE = H

7.3.3 VBUS Detection

The TUSB319-Q1 device supports VBUS detection according to the Type-C Specification. The system VBUS voltage must be routed through a 900-kΩ resistor to the VBUS_DET pin on the TUSB319-Q1. When voltage on VBUS_DET pin is below the VBUS(THR) and Rd is detected on either CC1 or CC2, the TUSB319 assumes system VBUS is at vSafe0V (VBUS < 800 mV) and will assert ID low.

If VBUS_DET pin is left unconnected system needs to ensure that the VBUS level is below vSafe0V before VBUS is enabled.

7.3.4 Cable Orientation

The TUSB319-Q1 detects the cable orientation by monitoring the voltage on the CC pins. When a voltage level within the proper threshold is detected on CC1, the DIR pin is pulled low. When a voltage level within the proper threshold is detected on CC2, the DIR is pulled high. The DIR pin is an open drain output.

7.4 Device Functional Modes

The TUSB319-Q1 device has two functional modes. Table 3 lists these modes:

Table 3. USB Type-C States According to TUSB319-Q1 Functional Modes

MODES GENERAL BEHAVIOR STATES(1)
Unattached USB port unattached. Unattached.SRC
AttachWait.SRC
Active USB port attached. Attached.SRC
(1) Required; not in sequential order.

7.4.1 Unattached Mode

Unattached mode is the primary mode of operation for the TUSB319-Q1 device, because a USB port can be unattached for a lengthy period of time. In unattached mode, all IOs are operational. After the TUSB319-Q1 device is powered up, the part enters unattached mode until a successful attach has been determined.

7.4.2 Active Mode

Active mode is defined as the port being attached. When in active mode, the TUSB319-Q1 device communicates to the system that the USB port is attached. This happens through the ID pin. The TUSB319-Q1 device exits active mode when the cable is unplugged.