2-Port SS/HS USB Hub Controller

Datasheet

SMSC USB5532B

9

Revision 1.2 (05-31-13)

DATASHEET

Chapter 2 Overview

The SMSC USB5532B hub is a 2-port, low-power, configurable Hub Controller fully compliant with the

USB 3.0 Specification [2]. The USB5532B supports 5 Gbps SuperSpeed (SS), 480 Mbps Hi-Speed

(HS), 12 Mbps Full-Speed (FS) and 1.5 Mbps Low-Speed (LS) USB signalling for complete coverage

of all defined USB operating speeds.

All required resistors on the USB ports are integrated into the hub. This includes all series termination

resistors and all required pull-down and pull-up resistors on D+ and D- pins. The over-current sense

inputs for the downstream facing ports have internal pull-up resistors.

The USB5532B hub includes programmable features such as:



Dedicated TTs help maintain consistent full-speed data throughput regardless of the number of

active downstream connections.



PortSwap: allows direct alignment of USB signals (D+/D-) to connectors to avoid uneven trace

length or crossing of the USB differential signals on the PCB.



PHYBoost: enables 4 programmable levels of USB signal drive strength in downstream port

transceivers. PHYBoost will also attempt to restore USB signal integrity.

2.1

Configurable Features

The SMSC USB5532B hub controller provides a default configuration that is sufficient for most

applications. When the hub is initialized in the default configuration, the following features may be

configured:



Downstream non-removable ports, where the hub will automatically report as a compound device



Downstream disabled ports



Downstream port power control and over-current detection on a ganged or individual basis



USB signal drive strength



USB differential pair pin location

The USB5532B hub controllers can alternatively be configured by OTP or as an SMBus slave device.

When the hub is configured by an OTP or over SMBus, the following configurable features are

provided:



Support for compound devices on a port-by-port basis



Selectable over-current sensing and port power control on an individual or ganged basis to match

the circuit board component selection



Customizable vendor ID, product ID, and device ID



Configurable delay time for filtering the over-current sense inputs



Indication of the maximum current that the hub consumes from the USB upstream port



Indication of the maximum current required for the hub controller



Custom string descriptors (up to 30 characters):

Product, manufacturer, and serial number