ZHCSDS6D May 2015 – October 2017 TUSB211
PRODUCTION DATA.
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.