TUSB211A
ZHCST15 –SEPTEMBER 2023
www.ti.com.cn
7 Detailed Description
7.1 Overview
The TUSB211A is a USB High-Speed (HS) signal conditioner designed to compensate for ISI signal loss in a
transmission channel. TUSB211A 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 allows application
in series to cover longer distances, or high loss transmission paths. A maximum of 4 devices can be daisy-
chained.
7.2 Functional Block Diagram
Low and Full
Speed Bypass
D2P
D1P
USB
TRANSCEIVER
High Speed
Compensation
ESD
PROTECTION
USB
CONNECTOR
D1M
D2M
CD
OPTIONAL
PLD
ENA_HS
Status flags
Copyright © 2018, Texas Instruments Incorporated
7.3 Feature Description
7.3.1 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 and by that is 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.
7.4 Device Functional Modes
7.4.1 Low-Speed (LS) Mode
TUSB211A automatically detects an LS connection and does not enable signal compensation. CD pin is
asserted high but ENA_HS will be low.
7.4.2 Full-Speed (FS) Mode
TUSB211A automatically detects an FS connection and does not enable signal compensation. CD pin is
asserted high but ENA_HS will be low.
7.4.3 High-Speed (HS) Mode
TUSB211A 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.
7.4.4 High-Speed Downstream Port Electrical Compliance Test Mode
TUSB211A 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 is in HS eye compliance test mode.
If the RSTN pin is asserted low and de-asserted high while TUSB211A is operating in HS functional mode, then
TUSB211A 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.
Copyright © 2023 Texas Instruments Incorporated
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7
Product Folder Links: TUSB211A
English Data Sheet: SLLSFW2