SMSC USB2512Ai User Manual

SMSC USB2512Ai

Revision 1.97 (08-11-08) 

T h e   S M S C   2 - P o r t   H u b   i s   a   l o w   p o w e r,   O E M
configurable, STT (single transaction translator) Hub
controller IC with 2 downstream ports for embedded
USB solutions.  The 2-port Hub is fully compliant with
the USB 2.0 Specification and will attach to an upstream
port as a Full-Speed Hub or as a Full-/Hi-Speed Hub.
The 2-Port Hub supports Low-Speed, Full-Speed, and
Hi-Speed (if operating as a Hi-Speed Hub) downstream
devices on all of the enabled downstream ports.

„

Hub Controller IC with 2 downstream ports

„

Enhanced OEM configuration options available 

through either a single serial I

2

C EEPROM, or 

SMBus Slave Port

„

36-pin (6x6mm) QFN lead-free RoHS compliant 

package

„

Supports industrial temperature range of -40ºC to 

85ºC

„

Low power operation

„

Full power management with individual or ganged 

power control of each downstream port

„

On-chip Power-On Reset (POR)

„

Internal 1.8V Voltage Regulator

„

Fully integrated USB termination and Pull-up/Pull-

down resistors

„

On Board 24MHz Crystal Driver, Resonator, or 

External 24MHz clock input

„

Enhanced EMI rejection and ESD protection 

performance

„

Customizable Vendor ID, Product ID, and Device ID

„

Select whether the Hub is part of a compound device: 

When any downstream port is permanently hardwired 
to a USB peripheral device, the Hub is part of a 
compound device

„

Flexible port mapping and disable sequence: Ports 

can be disabled or reordered in any order to support 
multiple product SKUs. The Hub will automatically 
reorder the remaining ports to match the Host 
controller's numbering scheme. 

„

Programmable USB differential-pair pin location: 

Ease PCB layout by aligning USB signal lines directly 
to connectors

„

Programmable USB signal drive strength: Recover 

USB signal integrity due to compromised system 
environment using 2-level driving strength resolution

„

Select the presence of a permanently hardwired USB 

peripheral device on a port-by-port basis

„

Configure the delay time for filtering the over-current 

sense inputs

„

Configure the delay time for turning on downstream 

port power

„

Indicate the maximum current that the 2-port Hub 

consumes from the USB upstream port

„

Indicate the maximum current required for the Hub 

controller 

„

Pin Selectable Option for Default Configuration: 

Select Downstream Ports as Non-Removable Ports 

„

LCD monitors and TVs 

„

Multi-function USB peripherals 

„

PC motherboards 

„

Set-top boxes, DVD players, DVR/PVR 

„

Printers and scanners 

„

PC media drive bay 

„

Portable Hub boxes 

„

Mobile PC docking 

„

Embedded systems