SLVSL35 September   2026 TUSB2514B

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Battery Charging Features
      2. 6.3.2 USB Power Management
      3. 6.3.3 Clock Generation
        1. 6.3.3.1 Crystal Requirements
        2. 6.3.3.2 Input Clock Requirements
      4. 6.3.4 Power-Up and Reset
    4. 6.4 Device Functional Modes
      1. 6.4.1 I2C EEPROM Operation
      2. 6.4.2 SMBus Target Operation
      3. 6.4.3 Port Configuration
  8. 7 Register Maps
    1. 7.1 TUSB2514 Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 TUSB2514B Power Supply
      2. 8.3.2 Downstream Port Power
      3. 8.3.3 Ground
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Placement
        2. 8.4.1.2 Package Specific
        3. 8.4.1.3 Differential Pairs
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

6.3.1 Battery Charging Features

The TUSB2514B provides support for USB Battery Charging (BC1.2) and custom divider-mode charging. Battery charging support can be enabled on a per port basis through the Battery Charging Support Register or the BATENn pins.

USB Battery charging support includes both Charging Downstream Port (CDP) and Dedicated Charging Port (DCP) modes. The DCP mode is compliant with the Chinese Telecommunications Industry Standard YD/T 1591-2009. CDP is enabled when the upstream port has detected valid VBUS, configured, and host sets port power. When the upstream port is not connected and battery charging support is enabled, the TUSB2514B enables DCP mode once all other battery modes such as ACPx have failed or are disabled.

In addition to USB Battery charging (BC1.2), the TUSB2514B supports custom charging indications: Divider Charging (ACP3, ACP2, ACP1 modes), and Galaxy compatible charging. These custom charging modes are only supported when upstream port is unconnected and Automode is enabled. The divided mode places a fixed DC voltage on the port's DP and DM signals which allows devices to identify the capabilities of the charger. Automode, and other battery charging features, can be enabled or disabled as shown in Table 6-1 with detailed descriptions of each register in Section 7.

Table 6-1 Battery Charging Settings
Enable bits Default Value Register Bit Field(s)
Battery Charging X (pin-strap) Battery Charging Support Register bcSupDsn
Automode 0 (enabled) Configuration Register 2 autoModeEnz
Full automode 0 (disabled) Configuration Register 3 FullAutoEn
ACP3 (high current) mode 0 (disabled) Configuration Register 2 HiCurAcpModeEn
Galaxy mode 0 (enabled) Configuration Register 3 Galaxy_Enz

Refer to Figure 6-1 to determine the sequence of attempted battery charging modes. When the upstream port is not connected and battery charging support is enabled for a port, the TUSB2514B drives the port power enable active.


TUSB2514B Battery Charging Diagram

Figure 6-1 Battery Charging Diagram

If AUTOMODE is enabled, then the TUSB2514B remains in highest ACP current mode enabled as long as a pullup is not detected on DP pin. If a pullup is detected on DP pin, then TUSB2514B drives the port power enable inactive and switches to Galaxy mode, if enabled, or to DCP mode if Galaxy mode is disabled. The TUSB2514B again drives the port power enable active. The TUSB2514B remains in Galaxy mode as long as no pullup is detected on DP pin.

If a pullup is detected on the DP pin when in Galaxy mode, then TUSB2514B drives the port power enable inactive and transitions to DCP mode. The TUSB2514B again drives the port power enable active. In DCP mode, the TUSB2514B looks for a pullup detected on DP pin or RxVdat. If a pullup or RxVdat is detected on DP, the TUSB2514B remains in DCP mode. If no pullup or RxVdat is detected on DP pin after 2 seconds, the TUSB2514B drives the port power enable inactive and transitions back to ACPx mode. This sequence repeats until upstream port is connected.