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

TUSB215

SLLSEX8A – AUGUST 2017 – REVISED AUGUST 2017

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Product Folder Links: TUSB215

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Copyright © 2017, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TUSB215 is a USB High-Speed (HS) signal conditioner, designed to compensate for ISI signal loss in a

transmission channel. TUSB215 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 TUSB215

provides USB Charging Downstream Port (CDP) controller for applications in which USB host or hub do not have

this function.

Programmable signal AC boost through an external resistor on EQ pin 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 pin helps overcoming the cable losses.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 EQ

The EQ pin of the TUSB215 is used to configure the AC boost of the device. The four levels of AC boost are set

through different values of an external pulldown resistor at this pin.

7.3.2 DC BOOST

The DC_BOOST pin of the TUSB215 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)

40

60

80