6 Detailed Description

6.1 Overview

The TUSB211A-Q1 is a USB High-Speed (HS) signal conditioner designed to compensate for ISI signal loss in

a transmission channel. TUSB211A-Q1 has a patented design for USB Low Speed (LS) and Full Speed (FS)

signals. It does not alter the signal characteristics. HS signals are compensated. 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. This helps pass USB HS electrical compliance tests at the connector. The TUSB211A-Q1 allows

application in series to cover longer distances, or high loss transmission paths. A maximum of 4 devices can be

daisy-chained.

6.2 Functional Block Diagram

USB

TRANSCEIVER

High Speed

Compensation

USB

CONNECTOR

Low and Full

Speed Bypass

Status flags

OPTIONAL

PLD

ESD

PROTECTION

D2P

D2M

D1P

D1M

CD

ENA_HS

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6.3 Feature Description

6.3.1 High-Speed EQ

The high-speed EQ (combination of edge boost and DC boost) improves the eye width for USB2.0 high-speed

signals. It is direction independent, which makes it compatible to OTG systems. The EQ pin is configuring the

EQ strength with different values of pull down resistors to set 4 levels of EQ.

6.4 Device Functional Modes

6.4.1 Low-Speed (LS) Mode

TUSB211A-Q1 automatically detects an LS connection and does not enable signal compensation. CD pin is

asserted high but ENA_HS will be low.

6.4.2 Full-Speed (FS) Mode

TUSB211A-Q1 automatically detects an FS connection and does not enable signal compensation. CD pin is

asserted high but ENA_HS will be low.

6.4.3 High-Speed (HS) Mode

TUSB211A-Q1 automatically detects an HS connection and will enable signal compensation as determined by

the external pull down resistance on its EQ pin.

CD pin and ENA_HS pin are asserted high when high-speed EQ is active.

6.4.4 High-Speed Downstream Port Electrical Compliance Test Mode

TUSB211A-Q1 will detect an HS compliance test fixture and enter the downstream port high-speed eye diagram

test mode. CD pin will be low and ENA_HS pin is asserted high when TUSB211A-Q1 is in HS eye compliance

test mode.

If the RSTN pin is asserted low and de-asserted high while TUSB211A-Q1 is operating in HS functional mode,

then TUSB211A-Q1 will transition to HS eye compliance test mode, the CD asserts low, and ENA_HS remains

high. When all this occurs, signal compensation is enabled.

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TUSB211A-Q1

SLLSFX8 – FEBRUARY 2024

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