SLLU327 May   2020 TUSB217A

 

  1.   Trademarks
  2. 1TUSB217AEVM-BC
  3. 2TUSB217AEVM-BC Board Description
  4. 3TUSB217AEVM-BC Kit Contents
  5. 4EVM Configuration
    1. 4.1 Setting EVM Jumpers
    2. 4.2 Selecting Configuration Levels
    3. 4.3 Battery Charging Functions of TUSB217A
      1. 4.3.1 Automatic DCP/CDP Test Setup
      2. 4.3.2 Manual DCP/CDP Test Setup
  6. 5EVM Operation
  7. 6TUSB217AEVM-BC Schematics
  8. 7TUSB217AEVM-BC Bill of Materials (BOM)

4.3.2 Manual DCP/CDP Test Setup

To manually test DCP/CDP features on the TUSB217AEVM-BC:

If the downstream device is not getting adequate VBUS toggle, to force a reconnect event the downstream device can be disconnected and reconnected or the external EVM power manually toggled:

Entering CDP mode from DCP mode:

  • No jumper on Header 6 × 2, pin 9 (CDP_ENZ in the schematic)
  • Power cycle the VCC_EXT_Px to the EVM or disconnect and reconnect the downstream device

Entering DCP mode from CDP mode:

  • Jumper on header 6 × 2, pin 9 (CDP_ENZ in the schematic) to GND (pin 10 or 11).
  • Power cycle the VCC_EXT_Px to the EVM or disconnect and reconnect the downstream device
Note: The VBUS toggle circuit on the TUSB217AEVM-BC should not be used as a reference design. The resistor divider used to sense upstream VBUS will back drive voltage on upstream VBUS due to the internal pullup on DCP/CDP. A design with a comparator is recommended.