SMSC USB2512 User Manual

USB2512

USB 2.0 High-Speed
2-Port Hub Controller

PRODUCT FEATURES

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-/High-Speed Hub.
The 2-Port Hub supports Low-Speed, Full- Speed, and
High-Speed (if operating as a High-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

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

 Customize 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/reordered in any order to support
multiple product SKUs. 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

Datasheet

 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 Options for Default Configuration

— Select Downstream Ports as Non-Removable Ports

Applications

 LCD monitors and TVs
 Multi-function USB peripherals
 PC mother boards
 Set-top boxes, DVD players, DVR/PVR
 Printers and scanners
 PC media drive bay
 Portable hub boxes
 Mobile PC docking
 Embedded systems

SMSC USB2512 DATASHEET Revision 1.92 (11-28-07)

USB 2.0 High-Speed 2-Port Hub Controller

ORDER NUMBER(S):

USB2512-AEZG FOR 36 PIN, QFN LEAD-FREE ROHS COMPLIANT PACKAGE

Datasheet

80 ARKAY DRIVE, HAUPPAUGE, NY 11788 [phone], FAX [phone]

Copyright © 2007 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.

Revision 1.92 (11-28-07) 2 SMSC USB2512

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

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 Recommended Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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

SMSC USB2512 3 Revision 1.92 (11-28-07)

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

List of Figures

Figure 1.1 USB2512 36-Pin QFN (Embedded Footprint) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 2.1 USB2512 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 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

SMSC USB2512 4 Revision 1.92 (11-28-07)

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

List of Tables

Table 3.1 USB2512 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3.2 SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 3.3 USB2512 Power, Ground, and No Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 3.4 USB2512 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

SMSC USB2512 5 Revision 1.92 (11-28-07)

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

Chapter 1 Pin Configuration

SUSP_IND/LOCAL_PWR/NON_REM0

VDDA33

USBUP_DM

USBUP_DP

XTAL2

XTAL1/CLKIN

VDD18PLL

RBIAS

VDD33PLL

RESET_N24HS_IND/CFG_SEL123SCL/SMBCLK/CFG_SEL022SDA/SMBDATA/NON_REM121NC20NC

VBUS_DET

26

25

27

28

29

30

31

32

Embedded Footprint

33

(Top View QFN-36)

34

35

(must be connected to VSS)

36

1

USBDN1_DM

USB2512

Thermal Slug

2

3

USBDN1_DP

USBDN2_DM

SMSC

4

USBDN2_DP

VDD33

5NC6NC7NC8NC9

VDDA33

NC

19

18

17

16

15

14

13

12

11

10

NC

OCS2_N

PRTPWR2

VDD33CR

VDD18

OCS1_N

PRTPWR1

TEST

VDDA33

Indicates pins on the bottom of the device.

Figure 1.1 USB2512 36-Pin QFN (Embedded Footprint)

SMSC USB2512 6 Revision 1.92 (11-28-07)

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

Chapter 2 Block Diagram

To Upstream

V

BUS

Bus-Power

Detect/V

BUS

Pulse

Upstream USB

Upstream

PHY

Repeater

Routing & Port Re-Ordering Logic

Data

24 MHz Crystal

3.3V

1.8V Reg

PLL

SIE

TT

1.8V

To EEPROM or

SMBus Master

SCKSD

Serial

Inte rface

Controller

Port

Controller

PHY#1

USB Data

Downstream

Port #1

OC

Sense

Switch

Driver

LED

Drivers

OC Sense

Switch/LED

Drivers

PHY#2

USB Data

Downstream

Figure 2.1 USB2512 Block Diagram

Port #2

OC

Sense

Switch

Driver

LED

Drivers

OC Sense

Switch/LED

Drivers

SMSC USB2512 7 Revision 1.92 (11-28-07)

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

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 USB2512 Pin Descriptions

SYMBOL

USBUP_DP

USBUP_DM

VBUS_DET 27

USBDN_DP[2:1]/

&

USBDN_DM[2:1]/

QFN-36

EMB

31
30

4
2

3
1

BUFFER

TYPE DESCRIPTION

UPSTREAM USB INTERFACES

IO-U USB Bus Data

These pins connect to the upstream USB bus data signals
(Host port, or upstream hub).

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 (signaling 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 of 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

IO-U High-Speed USB Data

These pins connect to the downstream USB peripheral devices
attached to the hub’s port.

PRTPWR[2:1] 16

12

OCS[2:1]_N 17

13

RBIAS 35

SMSC USB2512 8 Revision 1.92 (11-28-07)

O12 USB Power Enable

Enables power to USB peripheral devices downstream.

Note: The hub supports active high power controllers only!

IPU Over Current Sense

Input from external current monitor indicating an over-current
condition.
{Note: Contains internal pull-up to 3.3V supply}

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.

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

Table 3.1 USB2512 Pin Descriptions (continued)

Datasheet

SYMBOL

SDA/

SMBDATA/

NON_REM1

SCL/

SMBCLK/

CFG_SEL0

QFN-36

EMB

22

24

BUFFER

TYPE DESCRIPTION

SERIAL PORT INTERFACE

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 Ta bl e 3 .2 ), this pin will be sampled (in conjunction
with LOCAL_PWR/SUSP_IND/NON_REM0) at RESET_N
negation to determine if imports [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 nonremovable.

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable.

NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable.

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

XTAL1/

CLKIN

25

33

I/O12 High-Speed Upstream port indictor & Configuration

Programming Select

HS_IND: High 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

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.

Revision 1.92 (11-28-07) 9 SMSC USB2512

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

Table 3.1 USB2512 Pin Descriptions (continued)

BUFFER

TYPE DESCRIPTION

SYMBOL

QFN-36

EMB

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.
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 us.

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 Ta bl e 3 .2 ), 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 nonremovable, 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

Used for testing the chip. User must treat as a no-connect or
connect to ground.

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

SMSC USB2512 10 Revision 1.92 (11-28-07)

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

Table 3.2 SMBus or EEPROM Interface Behavior (continued)

CFG_SEL1 CFG_SEL0 SMBUS OR EEPROM INTERFACE BEHAVIOR

Datasheet

0 1 Configured as an SMBus slave for external download of user-defined

1 0 Internal Default Configuration

1 1 2-Wire I2C EEPROMS are supported.

Table 3.3 USB2512 Power, Ground, and No Connect

PACKAGE SYMBOL 36-QFN EMB

VDD18 14

VDD33PLL 36

descriptors.

 SMBus slave address 58 (0101100x)
 Strap Options Disabled
 All Settings Controlled by Registers

 Strap Options Enabled
 Bus Power Operation

 Strap Options Disabled
 All Settings Controlled by Registers

FUNCTION

VDD Core

This pin must have a 1.0μF (or greater) ±20% (ESR <0.1Ω) capacitor to
VSS.

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.

VDDPLL18 34 VDD PLL

This pin must have a 1.0μF (or greater) ±20% (ESR <0.1Ω) capacitor to
VSS.

VDDA33 5

10
29

VDD33/VDD33CR 23

15

VDD Analog I/O

+3.3V Filtered analog PHY power, shared between adjacent ports.

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

No Connect
7
8

Leave unconnected on the circuit board.
9

18
19
20
21

Revision 1.92 (11-28-07) 11 SMSC USB2512

DATASHEET

USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

3.2 Buffer Type Descriptions

Table 3.4 USB2512 Buffer Type Descriptions

BUFFER DESCRIPTION

I Input.

IPD Input with internal weak pull-down resistor.

IPU Input with internal weak pull-up resistor.

IS Input with Schmitt trigger.

O12 Output 12mA.

OD12 Open drain... 12mA sink.

I/O12 Input/Output buffer with 12mA sink and 12mA source.

I/OSD12

ICLKx XTAL clock input.

OCLKx XTAL clock output.

I-R RBIAS.

I/O-U Analog Input/Output Defined in USB specification.

AIO Analog Input/Output.

Open drain...12mA sink with Schmitt trigger, and must meet I2C-Bus Specification
Version 2.1 requirements.

SMSC USB2512 12 Revision 1.92 (11-28-07)

DATASHEET