TUSB211

USB

TRANSCEIVER

D2P

D2M

High Speed

Compensation

USB

CONNECTOR

Low and Full

Speed Bypass

ESD

PROTECTION

D1P

D1M

Status flags

OPTIONAL

PLD

CD

ENA_HS

Copyright © 2016, Texas Instruments Incorporated

7

TUSB211, TUSB211I

www.ti.com

SLLSEO0D – MAY 2015 – REVISED OCTOBER 2017

Product Folder Links: TUSB211

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Copyright © 2015–2017, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TUSB211 is a USB High-Speed (HS) signal conditioner, designed to compensate for ISI signal loss in a

transmission channel. TUSB211 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.

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.

The footprint of TUSB211 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 TUSB211 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 show 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 Device Functional Modes

7.3.1 Low Speed (LS) Mode

TUSB211 automatically detects a LS connection and does not enable signal compensation. CD pin is asserted

high.

7.3.2 Full Speed (FS) Mode

TUSB211 automatically detects a FS connection and does not enable signal compensation. CD pin is asserted

high.

7.3.3 High Speed (HS) Mode

TUSB211 automatically detects a HS connection and enables signal compensation as determined by the

configuration of the external pulldown resistance on its EQ pin. ENA_HS pin asserted high in addition to the CD

pin.

7.3.4 Disable Mode

TUSB211 can be disabled when its RSTN pin is asserted low. The USB channel is still fully operational, but there

is neither signal compensation, nor any indication from the CD pin or ENA_HS pin as to the status of the

channel.