ZHCSDU0F May   2015  – March 2022 TUSB320

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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 Timing Requirements
    7. 6.7 Switching Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
      1. 7.2.1 Cables, Adapters, and Direct Connect Devices
        1. 7.2.1.1 USB Type-C Receptacles and Plugs
        2. 7.2.1.2 USB Type-C Cables
        3. 7.2.1.3 Legacy Cables and Adapters
        4. 7.2.1.4 Direct Connect Devices
        5. 7.2.1.5 Audio Adapters
    3. 7.3 Feature Description
      1. 7.3.1 Port Role Configuration
        1. 7.3.1.1 Downstream Facing Port (DFP) – Source
        2. 7.3.1.2 Upstream Facing Port (UFP) – Sink
        3. 7.3.1.3 Dual Role Port (DRP)
      2. 7.3.2 Type-C Current Mode
      3. 7.3.3 Accessory Support
        1. 7.3.3.1 Audio Accessory
        2. 7.3.3.2 Debug Accessory
      4. 7.3.4 I2C and GPIO Control
      5. 7.3.5 VBUS Detection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Unattached Mode
      2. 7.4.2 Active Mode
      3. 7.4.3 Dead Battery Mode
      4. 7.4.4 Shutdown Mode
    5. 7.5 Programming
    6. 7.6 Register Maps
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 DRP in I2C Mode
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 DFP in I2C Mode
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
      3. 8.2.3 UFP in I2C Mode
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curves
    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 接收文档更新通知
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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8.2.1.2 Detailed Design Procedure

The TUSB320 device supports a VDD in the range of 2.75 V to 5 V. In this particular use case, VBAT which must be in the required VDD range is connected to the VDD pin. A 100-nF capacitor is placed near VDD.

The TUSB320 device is placed into I2C mode by either pulling the ADDR pin high or low. In this case, the ADDR pin is tied to GND which results in a I2C address of 0x60. The SDA and SCL must be pulled up to either 1.8 V or 3.3 V. When pulled up to 3.3 V, the VDD supply must be at least 3 V to keep from back-driving the I2C interface.

The TUSB320 device can enter shutdown mode by pulling the EN_N pin high, which puts the TUSB320 device into a low power state. In this case, external control of the EN_N pin is not implemented and therefore the EN_N pin is tied to GND.

The INT_N/OUT3 pin is used to notify the PMIC when a change in the TUSB320 I2C registers occurs. This pin is an open drain output and requires an external pullup resistor. The pin should be pulled up to VDD using a 200-kΩ resistor.

The ID pin is used to indicate when a connection has occurred if the TUSB320 device is a DFP while configured for DRP. An OTG USB controller can use this pin to determine when to operate as a USB host or USB device. When this pin is driven low, the OTG USB controller functions as a host and then enables VBUS. The Type-C standard requires that a DFP should not enable VBUS until it is in the Attached.SRC state. If the ID pin is not low but VBUS is detected, then OTG USB controller functions as a device. The ID pin is open drain output and requires an external pullup resistor. It should be pulled up to VDD using a 200-kΩ resistor.

The Type-C port mode is determined by the state of the PORT pin. When the PORT pin is not connected, the TUSB320 device is in DRP mode. The Type-C port mode can also be controlled by the MODE_SELECT register through the I2C interface when the TUSB320 device is in the unattached state.

The VBUS_DET pin must be connected through a 900-kΩ resistor to VBUS on the Type-C that is connected. This large resistor is required to protect the TUSB320 device from large VBUS voltage that is possible in present day systems. This resistor along with internal pulldown keeps the voltage observed by the TUSB320 device in the recommended range.

The USB2 specification requires the bulk capacitance on VBUS based on UFP or DFP. When operating the TUSB320 device in a DRP mode, it alternates between UFP and DFP. If the TUSB320 device connects as an UFP, the large bulk capacitance must be removed. The FET in Figure 8-7 performs this task.

Table 8-2 USB2 Bulk Capacitance Requirements
PORT CONFIGURATIONMINMAXUNIT
Downstream facing port (DFP)120µF
Upstream facing port (UFP)110µF
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