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.
5 EVM Operation
To install the EVM, perform the following steps:
1. Upstream connection: attach a USB cable from a host PC Type A connector to the Type B connector (P2 or
P4) of the EVM or connect P6 directly to the host PC.
2. Downstream connection: attach a USB device directly or via a USB cable plugged into the Type A receptacle
connector (P1, P3 or P5) on the EVM.
3. The upstream connection and downstream connections must be on the same board section of the EVM.
The TUSB217A will only re-drive USB 2.0 high-speed signals.
EVM Configuration
SLLU327 – MAY 2020
TUSB217AEVM-BC Evaluation Module
5
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