9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The purpose of the TUSB217A is to re-store the signal integrity of a USB High-speed channel up to the USB

connector. The loss in signal quality stems from reduced channel bandwidth due to high loss PCB trace and

other components that contribute a capacitive load. This can cause the channel to fail the USB near end eye

mask. Proper use of the TUSB217A can help to pass this eye mask.

A secondary purpose is to use the CD pin of the TUSB217A to control other blocks on the customer platform, if

so desired.

9.2 Typical Application

A typical application for TUSB217A with dynamic mode change between DCP and CDP is shown in Figure 9-1.

BC 1.2 controller mode will be based on host/hub active state in this application. When host/hub is not active the

controller will be in DCP mode and when the host/hub is active the controller will be in CDP mode. Downstream

VBUS needs to be toggled by the power controller to change advertisement and for portable device to re-detect

the BC 1.2 controller charging mode. In this setup, D2P and D2M face the USB connector while D1P and D1M

face the USB host. The orientation may be reversed [that is, D2 faces transceiver and D1 faces connector]

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TUSB217A

SLLSFK5 – JUNE 2021

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Product Folder Links: TUSB217A