SMSC USB2512Ai User manual

SMSC USB2512Ai DATASHEET Revision1.97(08-11-08)
Datasheet
PRODUCT FEATURES
USB2512Ai
Industrial TemperatureRated
USB 2.0 Hi-Speed 2-Port Hub
Controller
General Description
The SMSC 2-Port Hub is a low power, OEM
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.
General Features
Hub Controller IC with 2 downstream ports
Enhanced OEM configuration options available
through either a single serial I2C EEPROM, or
SMBus Slave Port
36-pin (6x6mm) QFN lead-free RoHS compliant
package
Supports industrial temperature range of -40ºC to
85ºC
Hardware Features
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
OEM Selectable Features
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
Applications
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

ORDER NUMBER:
USB2512Ai-AEZG FOR 36 PIN, QFN LEAD-FREE ROHS COMPLIANT PACKAGE
Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
Revision 1.97 (08-11-08) 2 SMSC USB2512Ai
DATASHEET
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 [phone], FAX [phone]
Copyright © 2008 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512Ai 3 Revision 1.97 (08-11-08)
DATASHEET
Table of Contents
Chapter 1 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 3 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 4 Configuration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 2-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.1 Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.2 VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 EEPROM Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.1 Internal Register Set (Common to EEPROM and SMBus) . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.2 I2C EEPROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.2.3 In-Circuit EEPROM Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3 SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3.1 Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3.2 Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.3 General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.4 Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.5 Stretching the SCLK Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.6 SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.7 Bus Reset Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.8 SMBus Alert Response Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.4 Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.5 Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.6 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.6.1 Internal POR Hardware Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.6.2 External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.6.3 USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Chapter 5 DC Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.1 Maximum Guaranteed Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2 Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Chapter 6 AC Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1 Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1.1 SMBus Interface:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1.2 I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1.3 USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Chapter 7 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
Revision 1.97 (08-11-08) 4 SMSC USB2512Ai
DATASHEET
List of Figures
Figure 1.1 USB2512Ai 36-Pin QFN (Embedded Footprint). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2.1 USB2512Ai Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4.1 Block Write. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 4.2 Block Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 4.3 Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 4.4 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 4.5 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 5.1 Supply Rise Time Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 6.1 Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 6.2 Formula to find value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 7.1 36-Pin QFN, 6x6mm Body, 0.5mm Pitch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512Ai 5 Revision 1.97 (08-11-08)
DATASHEET
List of Tables
Table 3.1 USB2512Ai Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3.2 SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 3.3 Power, Ground, and No Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 3.4 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map. . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4.2 Port Remap Register for Ports 1 & 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 4.3 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 4.4 Reset_N Timing for EEPROM Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 4.5 Reset_N Timing for SMBus Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 5.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 5.2 Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
Revision 1.97 (08-11-08) 6 SMSC USB2512Ai
DATASHEET
Chapter 1 Pin Configuration
Figure 1.1 USB2512Ai 36-Pin QFN (Embedded Footprint)
Thermal Slug
(must be connected to VSS)
SMSC
USB2512Ai
Embedded Footprint
(Top View QFN-36)
Indicates pins on the bottom of the device.
26
VDD33
25
RESET_N
24
HS_IND/CFG_SEL1
23
SCL/SMBCLK/CFG_SEL0
22 SDA/SMBDATA/NON_REM1 21 NC 20 NC 19
VBUS_DET
27
NC
18 NC
17 OCS2_N
16 PRTPWR2
15
OCS1_N
14
VDD33CR
13
VDD18
12 PRTPWR1
11 TEST
10 VDDA33
SUSP_IND/LOCAL_PWR/NON_REM0 28
VDDA33 29
USBUP_DP 31
XTAL2 32
XTAL1/CLKIN 33
RBIAS
36
VDD33PLL
35
VDD18PLL 34
USBUP_DM 30
VDDA33
1
USBDN1_DM
2
USBDN1_DP
3
USBDN2_DM
4
USBDN2_DP
5
NC 6 NC 7 NC 8 NC 9

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512Ai 7 Revision 1.97 (08-11-08)
DATASHEET
Chapter 2 Block Diagram
Figure 2.1 USB2512Ai Block Diagram
To Upstream
VBUS
3.3V
Upstream
PHY
Upstream USB
Data
Repeater Controller
SIE
Serial
Interface
PLL
24 MHz Crystal To EEPROM or
SMBus Master
Routing & Port Re-Ordering Logic
SCKSD
TT Port
Controller
Bus-Power
Detect/VBUS
Pulse
1.8V
1.8V Reg
PHY#1
Port #1
OC
Sense
Switch
Driver
LED
Drivers
PHY#2
Port #2
OC
Sense
Switch
Driver
LED
Drivers
USB Data
Downstream OC Sense
Switch/LED
Drivers
USB Data
Downstream OC Sense
Switch/LED
Drivers

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
Revision 1.97 (08-11-08) 8 SMSC USB2512Ai
DATASHEET
Chapter 3 Pin Descriptions
3.1 Pin Descriptions
This section provides a detailed description of each signal. The signals are arranged in functional
groups according to their associated interface.
The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal
is at a low voltage level. When “N” is not present before the signal name, the signal is asserted when
at the high voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working
with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a
signal is active, independent of whether that level is represented by a high or low voltage. The term
negate, or negation, indicates that a signal is inactive.
Table 3.1 USB2512Ai Pin Descriptions
SYMBOL QFN-36 EMB BUFFER
TYPE DESCRIPTION
UPSTREAM USB INTERFACES
USBUP_DP
USBUP_DM 31 30 IO-U USB Bus Data
These pins connect to the upstream USB bus data signals such
as the Host port or upstream Hub.
VBUS_DET 27 I/O12 Detect Upstream VBUS Power
Detects state of Upstream VBUS power. The SMSC Hub
monitors VBUS_DET to determine when to assert the internal
D+ pull-up resistor which signals a connect event.
When designing a detachable Hub, this pin must be connected
to the VBUS power pin of the USB port that is upstream from
the Hub.
For self-powered applications with a permanently attached
host, this pin must be connected to 3.3V (typically VDD33).
DOWNSTREAM 2-PORT USB 2.0 INTERFACE
USBDN[2:1]_DP/
&
USBDN[2:1]_DM/
4
2IO-U Hi-Speed USB Data
These pins connect to the downstream USB peripheral devices
attached to the Hub’s port.
3
1
PRTPWR[2:1] 16
12 O12 USB Power Enable
Enables power to USB peripheral devices downstream.
Note: The Hub supports active high power controllers only!
OCS[2:1]_N 17
13 IPU Over-Current Sense
Input from external current monitor indicating an over-current
condition.
{Note: Contains internal pull-up to 3.3V supply}

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
SMSC USB2512Ai 9 Revision 1.97 (08-11-08)
DATASHEET
RBIAS 35 I-R USB Transceiver Bias
A 12.0kΩ(+/- 1%) resistor is attached from ground to this pin
to set the transceiver’s internal bias settings.
SERIAL PORT INTERFACE
SDA/
SMBDATA/
NON_REM1
22 I/OSD12 Serial Data / SMB Data & Port Non-removable Strap Option
NON_REM1: Non-removable port strap option.
If this strap is enabled by package and configuration settings
(see Table 3.2, "SMBus or EEPROM Interface Behavior"), this
pin will be sampled (in conjunction with LOCAL_PWR/
SUSP_IND/NON_REM0) at RESET_N negation to determine if
ports [2:1] contain permanently attached (non-removable)
devices:
NON_REM[1:0] = ‘00’, All ports are removable.
NON_REM[1:0] = ‘01’, Port 1 is non-removable.
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable.
NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable.
SCL/
SMBCLK/
CFG_SEL0
24 I/OSD12 Serial Clock (SCL)
SMBus Clock (SMBCLK)
Configuration Select_SEL0: The logic state of this multifunction
pin is internally latched on the rising edge of RESET_N
(RESET_N negation), and will determine the Hub configuration
method as described in Table 3.2, "SMBus or EEPROM
Interface Behavior".
HS_IND/
CFG_SEL1 25 I/O12 Hi-Speed Upstream port indicator & Configuration
Programming Select
HS_IND: Hi-Speed Indicator for upstream port connection
speed.
The active state of the LED will be determined as follows:
CFG_SEL1 = ‘0’,
HS_IND is active high,
CFG_SEL1 = ‘1’,
HS_IND is active low,
‘Asserted’ = Hub is connected at HS
‘Negated’ = Hub is connected at FS
CFG_SEL1: The logic state of this pin is internally latched on
the rising edge of RESET_N (RESET_N negation), and will
determine the Hub configuration method as described in
Table 3.2, "SMBus or EEPROM Interface Behavior".
MISC
XTAL1/
CLKIN 33 ICLKx Crystal Input/External Clock Input
24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or to an
external 24MHz clock when a crystal is not used.
Table 3.1 USB2512Ai Pin Descriptions (continued)
SYMBOL QFN-36 EMB BUFFER
TYPE DESCRIPTION

Industrial Temperature Rated USB 2.0 Hi-Speed 2-Port Hub Controller
Datasheet
Revision 1.97 (08-11-08) 10 SMSC USB2512Ai
DATASHEET
XTAL2 32 OCLKx Crystal Output
24MHz Crystal
This is the other terminal of the crystal, or a NO CONNECT
when an external clock source is used to drive XTAL1/CLKIN.
Note: This output must not be used to drive any external
circuitry other than the crystal circuit.
RESET_N 26 IS RESET Input
The system can reset the chip by driving this input low. The
minimum active low pulse is 1 μs.
When the RESET_N pin is pulled to VDD33, the internal POR
(Power-on Reset) is enabled and no external reset circuitry is
required. The internal POR holds the internal logic in reset until
the power supplies are stable.
SUSP_IND/
LOCAL_PWR/
NON_REM0
28 I/O Active/Suspend status LED or Local-Power & Non-removable
Strap Option
Suspend Indicator: Indicates USB state of the Hub.
‘negated’ = Unconfigured, or configured and in USB Suspend
‘asserted’ = Hub is configured, and is active (i.e., not in
suspend)
Local Power: Detects availability of local self-power source.
Low = Self/local power source is NOT available (i.e., Hub gets
all power from Upstream USB VBus).
High = Self/local power source is available.
NON_REM0 Strap Option:
If this strap is enabled by package and configuration settings
(see Table 3.2, "SMBus or EEPROM Interface Behavior"), this
pin will be sampled (in conjunction with NON_REM1) at
RESET_N negation to determine if ports [2:1] contain
permanently attached (non-removable) devices. Also, the
active state of the LED will be determined as follows:
NON_REM[1:0] = ‘00’, All ports are removable, and the LED is
active high
NON_REM[1:0] = ‘01’, Port 1 is non-removable, and the LED
is active low
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable, and the
LED is active high
NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable, and the
LED is active low
TEST 11 IPD TEST pin
XNOR continuity tests all signal pins on the Hub. Please
contact your SMSC representative for a detailed description of
how this test mode is enabled and utilized.
Table 3.1 USB2512Ai Pin Descriptions (continued)
SYMBOL QFN-36 EMB BUFFER
TYPE DESCRIPTION

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SMSC USB2512Ai 11 Revision 1.97 (08-11-08)
DATASHEET
Table 3.2 SMBus or EEPROM Interface Behavior
CFG_SEL1 CFG_SEL0 SMBUS OR EEPROM INTERFACE BEHAVIOR
0 0 Internal Default Configuration
Strap Options Enabled
0 1 Configured as an SMBus slave for external download of user-defined
descriptors
SMBus slave address 58 (0101100x)
Strap Options Disabled
All Settings Controlled by Registers
1 0 Internal Default Configuration
Strap Options Enabled
Bus Power Operation
112-WireI
2C EEPROMS are supported
Strap Options Disabled
All Settings Controlled by Registers
Table 3.3 Power, Ground, and No Connect
PACKAGE SYMBOL 36-QFN EMB FUNCTION
VDD18 14 VDD Core
This pin must have a 1.0μF (or greater) ±20% (ESR <0.1Ω) capacitor to
VSS.
VDD33PLL 36 VDD 3.3 PLL Regulator Reference
+3.3V power supply for the PLL. If the internal PLL 1.8V regulator
is enabled, then this pin acts as the regulator input.
VDD18PLL 34 VDD PLL
This pin must have a 1.0μF (or greater) ±20% (ESR <0.1Ω) capacitor to
VSS.
VDDA33 5
10
29
VDD Analog I/O
+3.3V Filtered analog PHY power, shared between adjacent ports.
VDD33/VDD33CR 23
15 VDDIO/VDD 3.3 Core Regulator Reference
+3.3V power supply for the Digital I/O - If the internal core regulator is
enabled, then VDD33CR acts as the regulator input.
NC 6
7
8
9
18
19
20
21
No Connect
No trace or signal should be routed or attached to these pins.

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3.2 Buffer Type Descriptions
Table 3.4 Buffer Type Descriptions
BUFFER DESCRIPTION
I/O Input/Output.
IPD Input with internal weak pull-down resistor.
IPU Input with internal weak pull-up resistor.
IS Input with Schmitt trigger.
O12 Output 12mA.
I/O12 Input/Output buffer with 12mA sink and 12mA source.
I/OSD12 Open drain with Schmitt trigger and 12mA sink. Must meet I2C-Bus Specification
Version 2.1 requirements.
ICLKx XTAL clock input.
OCLKx XTAL clock output.
I-R RBIAS.
I/O-U Analog Input/Output Defined in USB specification.

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Chapter 4 Configuration Options
4.1 2-Port Hub
SMSC’s USB 2.0 2-Port Hub is fully specification compliant to the Universal Serial Bus Specification
Revision 2.0 April 27, 2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 10 (Hub
Specification) for general details regarding Hub operation and functionality.
The 2-Port Hub provides 1 Transaction Translator (TT) that is shared by both downstream ports
(defined as Single-TT configuration), The TT contains 4 non-periodic buffers.
4.1.1 Hub Configuration Options
The SMSC Hub supports a large number of features (some are mutually exclusive), and must be
configured in order to correctly function when attached to a USB host controller. There are three
principal ways to configure the hub: SMBus, EEPROM, or by internal default settings (with or without
pin strapping option over-rides). In all cases, the configuration method will be determined by the
CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.
4.1.1.1 Power Switching Polarity
The hub only supports “active high” port power controllers.
4.1.2 VBus Detect
According to Section 7.2.1 of the USB 2.0 Specification, a downstream port can never provide power
to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.
The VBUS_DET pin on the Hub monitors the state of the upstream VBUS signal and will not pull-up
the D+ resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not Powered),
the Hub will remove power from the D+ pull-up resistor within 10 seconds.
4.2 EEPROM Interface
The SMSC Hub can be configured via a 2-wire (I2C) EEPROM (256x8). (Please see Table 3.1 for
specific details on how to enable configuration via an I2C EEPROM).
The Internal state-machine will (when configured for EEPROM support) read the external EEPROM for
configuration data. The hub will then “attach” to the upstream USB host.
Note: The Hub does not have the capacity to write, or “Program,” an external EEPROM. The Hub only
has the capability to read external EEPROMs. The external eeprom will be read (even if it is blank or
non-populated), and the hub will be “configured” with the values that are read.
Please see Internal Register Set (Common to EEPROM and SMBus) for a list of data fields available.
4.2.1 Internal Register Set (Common to EEPROM and SMBus)
Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map
REG
ADDR R/W REGISTER NAME ABBR INTERNAL DEFAULT ROM
SMBUS AND
EEPROM OR
VALUES
00h R/W VID LSB VIDL 24h 0x00
01h R/W VID MSB VIDM 04h 0x00
02h R/W PID LSB PIDL 12h 0x00

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4.2.1.1 Register 00h: Vendor ID (LSB)
03h R/W PID MSB PIDM 25h 0x00
04h R/W DID LSB DIDL A0h 0x00
05h R/W DID MSB DIDM 0Ah 0x00
06h R/W Config Data Byte 1 CFG1 8Bh 0x00
07h R/W Config Data Byte 2 CFG2 10h 0x00
08h R/W Config Data Byte 3 CFG3 00h 0x00
09h R/W Non-Removable Devices NRD 00h 0x00
0Ah R/W Port Disable (Self) PDS 00h 0x00
0Bh R/W Port Disable (Bus) PDB 00h 0x00
0Ch R/W Max Power (Self) MAXPS 01h 0x00
0Dh R/W Max Power (Bus) MAXPB 32h 0x00
0Eh R/W Hub Controller Max Current
(Self) HCMCS 01h 0x00
0Fh R/W Hub Controller Max Current
(Bus) HCMCB 32h 0x00
10h R/W Power-on Time PWRT 32h 0x00
11h-F5h R/W Reserved N/A 01h 0x00
F6h R/W Boost_Up BOOSTUP 00h 0x00
F7h R/W Reserved N/A 00h 0x00
F8h R/W Boost_2:0 BOOST20 00h 0x00
F9h R/W Reserved N/A 00h 0x00
FAh R/W Port Swap PRTSP 00h 0x00
FBh R/W Port Remap 12 PRTR12 00h 0x00
FC-FEh R/W Reserved N/A 00h 0x00
FFh R/W Status/Command
Note: SMBus register only STCD 00h 0x00
BIT
NUMBER BIT NAME DESCRIPTION
7:0 VID_LSB Least Significant Byte of the Vendor ID. This is a 16-bit value that uniquely
identifies the Vendor of the user device (assigned by USB-Interface Forum).
This field is set by the OEM using either the SMBus or EEPROM interface
options.
Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map (continued)
REG
ADDR R/W REGISTER NAME ABBR INTERNAL DEFAULT ROM
SMBUS AND
EEPROM OR
VALUES

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4.2.1.2 Register 01h: Vendor ID (MSB)
4.2.1.3 Register 02h: Product ID (LSB)
4.2.1.4 Register 03h: Product ID (MSB)
4.2.1.5 Register 04h: Device ID (LSB)
4.2.1.6 Register 05h: Device ID (MSB)
BIT
NUMBER BIT NAME DESCRIPTION
7:0 VID_MSB Most Significant Byte of the Vendor ID. This is a 16-bit value that uniquely
identifies the Vendor of the user device (assigned by USB-Interface Forum).
This field is set by the OEM using either the SMBus or EEPROM interface
options.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 PID_LSB Least Significant Byte of the Product ID. This is a 16-bit value that the Vendor
can assign that uniquely identifies this particular product (assigned by OEM).
This field is set by the OEM using either the SMBus or EEPROM interface
options.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 PID_MSB Most Significant Byte of the Product ID. This is a 16-bit value that the Vendor
can assign that uniquely identifies this particular product (assigned by OEM).
This field is set by the OEM using either the SMBus or EEPROM interface
options.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 DID_LSB Least Significant Byte of the Device ID. This is a 16-bit device release
number in BCD format (assigned by OEM). This field is set by the OEM
using either the SMBus or EEPROM interface options.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 DID_MSB Most Significant Byte of the Device ID. This is a 16-bit device release
number in BCD format (assigned by OEM). This field is set by the OEM
using either the SMBus or EEPROM interface options.

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4.2.1.7 Register 06h: CONFIG_BYTE_1
BIT
NUMBER BIT NAME DESCRIPTION
7 SELF_BUS_PWR Self or Bus Power: Selects between Self- and Bus-Powered operation.
The Hub is either Self-Powered (draws less than 2mA of upstream bus
power) or Bus-Powered (limited to a 100mA maximum of upstream power
prior to being configured by the host controller).
When configured as a Bus-Powered device, the SMSC Hub consumes less
than 100mA of current prior to being configured. After configuration, the Bus-
Powered SMSC Hub (along with all associated hub circuitry, any embedded
devices if part of a compound device, and 100mA per externally available
downstream port) must consume no more than 500mA of upstream VBUS
current. The current consumption is system dependent, and the OEM must
ensure that the USB 2.0 specifications are not violated.
When configured as a Self-Powered device, <1mA of upstream VBUS
current is consumed and all ports are available, with each port being capable
of sourcing 500mA of current.
This field is set by the OEM using either the SMBus or EEPROM interface
options.
Please see the description under Dynamic Power for the self/bus power
functionality when dynamic power switching is enabled.
0 = Bus-Powered operation
1 = Self-Powered operation
Note: If Dynamic Power Switching is enabled, this bit is ignored and the
LOCAL_PWR pin is used to determine if the hub is operating from self or
bus power.
6 Reserved Reserved
5 HS_DISABLE Hi-Speed Disable: Disables the capability to attach as either a Hi-/Full-Speed
device, and forces attachment as Full-Speed only (i.e. no Hi-Speed support).
0 = Hi-/Full-Speed
1 = Full-Speed-Only (Hi-Speed disabled!)
4 Reserved Reserved
3 EOP_DISABLE EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.
During FS operation only, this permits the Hub to send EOP if no
downstream traffic is detected at EOF1. See Section 11.3.1 of the USB 2.0
Specification for additional details. Note: generation of an EOP at the EOF1
point may prevent a Host controller (operating in FS mode) from placing the
USB bus in suspend.
0 = EOP generation is normal
1 = EOP generation is disabled
2:1 CURRENT_SNS Over-Current Sense: Selects current sensing on a port-by-port basis, all
ports ganged, or none (only for bus-powered hubs). The ability to support
current sensing on a port or ganged basis is hardware implementation
dependent.
00 = Ganged sensing (all ports together)
01 = Individual port-by-port
1x = Over-current sensing not supported (must only be used with Bus-
Powered configurations!)

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4.2.1.8 Register 07h: Configuration Data Byte 2
0 PORT_PWR Port Power Switching: Enables power switching on all ports simultaneously
(ganged), or port power is individually switched on and off on a port- by-port
basis (individual). The ability to support power enabling on a port or ganged
basis is hardware implementation dependent.
0 = Ganged switching (all ports together)
1 = Individual port-by-port switching
BIT
NUMBER BIT NAME DESCRIPTION
7 DYNAMIC Dynamic Power Enable: Controls the ability of the Hub to automatically
change from Self-Powered operation to Bus-Powered operation if the local
power source is removed or is unavailable (and from Bus-Powered to Self-
Powered if the local power source is restored). {Note: If the local power
source is available, the Hub will always switch to Self-Powered operation.}
When Dynamic Power switching is enabled, the Hub detects the availability
of a local power source by monitoring the external LOCAL_PWR pin. If the
Hub detects a change in power source availability, the Hub immediately
disconnects and removes power from all downstream devices and
disconnects the upstream port. The Hub will then re-attach to the upstream
port as either a Bus-Powered Hub (if local-power is unavailable) or a Self-
Powered Hub (if local power is available).
0 = No Dynamic auto-switching
1 = Dynamic Auto-switching capable
6 Reserved Reserved
5:4 OC_TIMER OverCurrent Timer: Over-current Timer delay.
00 = 0.1 ms
01 = 4.0 ms
10 = 8.0 ms
11 = 16.0 ms
3 COMPOUND Compound Device: Allows OEM to indicate that the Hub is part of a
compound (see the USB Specification for definition) device. The
applicable port(s) must also be defined as having a "Non-Removable
Device".
Note: When configured via strapping options, declaring a port as non-
removable automatically causes the hub controller to report that it
is part of a compound device.
0 = No
1 = Yes, Hub is part of a compound device
2:0 Reserved Reserved
BIT
NUMBER BIT NAME DESCRIPTION

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4.2.1.9 Register 08h: Configuration Data Byte 3
4.2.1.10 Register 09h: Non-Removable Device
BIT
NUMBER BIT NAME DESCRIPTION
7:4 Reserved Reserved
3 PRTMAP_EN Port Re-mapping enable: Selects the method used by the hub to assign port
numbers and disable ports.
‘0’ = Standard Mode
‘1’ = Port Re-map mode
2:0 Reserved Reserved
BIT
NUMBER BIT NAME DESCRIPTION
7:0 NR_DEVICE Non-removable Device: Indicates which port(s) include non-removable
devices. ‘0’ = port is removable, ‘1’ = port is non-removable.
Informs the Host if one of the active ports has a permanent device that is
undetachable from the Hub. (Note: The device must provide its own
descriptor data.)
When using the internal default option, the NON_REM[1:0] pins will
designate the appropriate ports as being non- removable.
Bit 7= Reserved, always = ‘0’
Bit 6= Reserved, always = ‘0’
Bit 5= Reserved, always = ‘0’
Bit 4= Reserved, always = ‘0’
Bit 3= Reserved, always = ‘1’
Bit 2= 1; Port 2 non-removable
Bit 1= 1; Port 1 non removable
Bit 0= Reserved, always = ‘0’

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4.2.1.11 Register 0Ah: Port Disable For Self-Powered Operation
4.2.1.12 Register 0Bh: Port Disable For Bus-Powered Operation
BIT
NUMBER BIT NAME DESCRIPTION
7:0 PORT_DIS_SP Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
During Self-Powered operation when remapping mode is disabled
(PRTMAP_EN='0'), this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a Host
Controller. The ports can be disabled in any order, the internal logic will
automatically report the correct number of enabled ports to the USB Host,
and will reorder the active ports in order to ensure proper function.
Bit 7= Reserved, always = ‘0’
Bit 6= Reserved, always = ‘0’
Bit 5= Reserved, always = ‘0’
Bit 4= Reserved, always = ‘0’
Bit 3= Reserved, always = ‘1’
Bit 2= 1; Port 2 is disabled
Bit 1= 1; Port 1 is disabled
Bit 0= Reserved, always = ‘0’
BIT
NUMBER BIT NAME DESCRIPTION
7:0 PORT_DIS_BP Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
During Self-Powered operation when remapping mode is disabled
(PRTMAP_EN='0'), this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a Host
Controller. The ports can be disabled in any order, the internal logic will
automatically report the correct number of enabled ports to the USB Host,
and will reorder the active ports in order to ensure proper function.
When using the internal default option, the PRT_DIS[1:0] pins will disable the
appropriate ports.
Bit 7= Reserved
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= Reserved, always = ‘1’
Bit 2= 1; Port 2 is disabled
Bit 1= 1; Port 1 is disabled
Bit 0 is Reserved, always = ‘0’

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4.2.1.13 Register 0Ch: Max Power For Self-Powered Operation
4.2.1.14 Register 0Dh: Max Power For Bus-Powered Operation
4.2.1.15 Register 0Eh: Hub Controller Max Current For Self-Powered Operation
BIT
NUMBER BIT NAME DESCRIPTION
7:0 MAX_PWR_SP Max Power Self_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
BIT
NUMBER BIT NAME DESCRIPTION
7:0 MAX_PWR_BP Max Power Bus_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
BIT
NUMBER BIT NAME DESCRIPTION
7:0 HC_MAX_C_SP Hub Controller Max Current Self-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a self-
powered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA, which is the default value.