USB

TRANSCEIVER

USB

CONNECTOR

ESD

PROTECTION

OPTIONAL

PLD

D1P

D1M

CD

ENA_HS

D2P

D2M

Low and Full

Speed Bypass

Status Flags

High Speed

Compensation

CDP Controller

8

TUSB214

SLLSEX7A – AUGUST 2017 – REVISED SEPTEMBER 2017

www.ti.com

Product Folder Links: TUSB214

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Copyright © 2017, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TUSB214 is a USB High-Speed (HS) signal conditioner, designed to compensate for ISI signal loss in a

transmission channel. TUSB214 has a patent-pending design which is agnostic to USB Low Speed (LS) and Full

Speed (FS) signals and does not alter their signal characteristics, while HS signals are compensated. In addition,

the design is compatible with USB On-The-Go (OTG) and Battery Charging (BC) specifications. The TUSB214

includes a USB BC Charging Downstream Port (CDP) controller.

Programmable signal gain through an external resistor permits fine tuning device performance to optimize signals

helping to pass USB HS electrical compliance tests at the connector. Additional DC boost configurable by three

level input DC_BOOST helps overcoming the cable losses.

The footprint of TUSB214 allows a board layout using this device such that it does not break the continuity of the

DP/DM signal traces. This permits risk free system design of a complete USB channel with flexible use of one or

multiple TUSB214 devices as needed for optimal signal integrity. This allows system designers to plan for this

device and use it only if signal integrity analysis and/or lab measurements sow a need. If such a need is not

warranted, the device can be left unpopulated without any board rework.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 EQ

The EQ pin of the TUSB214 is used to configure the AC boost of the device. The four levels are set through

different values of an external pulldown resistor at this pin.

7.3.2 DC BOOST

The DC_BOOST pin of the TUSB214 is a tri-level pin, used to set the DC gain of the device according to

Table 1.

Table 1. DC Boost Settings

DC BOOST SETTING VIA PIN STRAP

DC_BOOST

DC Boost Setting (mV)

VIL

40

VIM

60

VIH

80