SMSC USB2512A User Manual

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USB2512A

USB 2.0 Hi-Speed 2-Port

Hub Controller

PRODUCT FEATURES

Datasheet

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, FullSpeed, 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

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/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

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 USB2512A

DATASHEET

Revision 1.96 (07-11-08)

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

ORDER NUMBERS:

USB2512A-AEZG FOR 36 PIN, QFN LEAD-FREE ROHS COMPLIANT PACKAGE

80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123

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.

Revision 1.96 (07-11-08)

2

SMSC USB2512A

 

DATASHEET

 

USB 2.0 Hi-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 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

SMSC USB2512A

3

Revision 1.96 (07-11-08)

 

DATASHEET

 

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

List of Figures

Figure 1.1 USB2512A 36-Pin QFN (Embedded Footprint) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2.1 USB2512A 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

Revision 1.96 (07-11-08)

4

SMSC USB2512A

 

DATASHEET

 

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

List of Tables

Table 3.1 USB2512A Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3.2 SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 3.3 USB2512A Power, Ground, and No Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 3.4 USB2512A 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 USB2512A

5

Revision 1.96 (07-11-08)

 

DATASHEET

 

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

Chapter 1 Pin Configuration

 

VBUS DET

RESET N

HS IND/CFG SEL1

SCL/SMBCLK/CFG SEL0

VDD33

SDA/SMBDATA/NON REM1

NC

NC

NC

 

 

27

26

25

24

23

22

21

20

19

 

SUSP_IND/LOCAL_PWR/NON_REM0

28

 

 

 

 

 

 

 

18

NC

VDDA33

29

 

 

 

 

 

 

 

17

OCS2_N

USBUP_DM

30

 

 

SMSC

 

 

16

PRTPWR2

USBUP_DP

31

 

 

 

 

15

VDD33CR

 

 

USB2512A

 

XTAL2

32

 

 

 

14

VDD18

Embedded Footprint

XTAL1/CLKIN

33

13

OCS1_N

(Top View QFN-36)

VDD18PLL

34

12

PRTPWR1

 

 

Thermal Slug

 

 

RBIAS

35

 

 

 

 

11

TEST

(must be connected to VSS)

 

 

 

 

VDD33PLL

36

 

 

 

 

 

 

 

10

VDDA33

 

1 2 3 4 5 6 7 8 9

 

 

USBDN1 DM

USBDN1 DP

USBDN2 DM

USBDN2 DP

VDDA33

NC

NC

NC

NC

 

Indicates pins on the bottom of the device.

Figure 1.1 USB2512A 36-Pin QFN (Embedded Footprint)

Revision 1.96 (07-11-08)

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SMSC USB2512A

 

DATASHEET

 

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

Chapter 2 Block Diagram

To U pstream

U pstream U SB

24 M H z C rystal

To EEPR O M or

V B U S

D ata

SM Bus M aster

 

 

 

 

3.3V

1.8V

SD

SC K

 

 

 

 

 

 

 

 

PLL

 

Serial

 

Bus-Pow er

Upstream

 

 

Interface

 

Detect/VB U S

1.8V Reg

 

 

 

PHY

 

 

 

Pulse

 

 

 

 

 

 

 

 

 

 

 

Repeater

SIE

 

Controller

 

 

 

 

 

 

 

 

 

 

 

 

 

TT

 

Port

 

 

 

 

 

Controller

 

 

 

 

 

 

 

 

Routing & Port Re-O rdering Logic

 

 

 

 

 

Port #1

 

Port #2

 

 

 

 

O C

 

O C

 

 

 

PHY#1

Sense

PHY#2

Sense

 

 

 

Sw itch

Sw itch

 

 

 

 

Driver

 

Driver

 

 

 

 

LED

 

LED

 

 

 

 

Drivers

 

Drivers

 

 

U SB D ata O C Sense

U SB D ata

O C Sense

D ow nstream Switch/LED

Downstream

Switch/LED

Drivers

 

Drivers

Figure 2.1 USB2512A Block Diagram

SMSC USB2512A

7

Revision 1.96 (07-11-08)

 

DATASHEET

 

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

Chapter 3 Pin Descriptions

3.1PIN 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 USB2512A Pin Descriptions

 

QFN-36

 

BUFFER

 

SYMBOL

EMB

 

TYPE

DESCRIPTION

 

 

 

 

 

 

 

 

UPSTREAM USB INTERFACES

 

 

 

 

 

USBUP_DP

31

 

IO-U

USB Bus Data

USBUP_DM

30

 

 

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 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

 

 

 

 

 

USBDN_DP[2:1]/

4

 

IO-U

Hi-Speed USB Data

&

2

 

 

These pins connect to the downstream USB peripheral devices

 

 

 

 

 

 

 

3

 

 

attached to the Hub’s port.

USBDN_DM[2:1]/

1

 

 

 

 

 

 

 

 

PRTPWR[2:1]

16

 

O12

USB Power Enable

 

12

 

 

Enables power to USB peripheral devices downstream.

 

 

 

 

 

 

 

 

Note: The Hub supports active high power controllers only!

 

 

 

 

 

OCS[2:1]_N

17

 

IPU

Over-Current Sense

 

13

 

 

Input from external current monitor indicating an over-current

 

 

 

 

 

 

 

 

condition.

 

 

 

 

{Note: Contains internal pull-up to 3.3V supply}

 

 

 

 

 

Revision 1.96 (07-11-08)

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SMSC USB2512A

 

DATASHEET

 

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

Table 3.1 USB2512A Pin Descriptions (continued)

 

QFN-36

BUFFER

 

SYMBOL

EMB

TYPE

DESCRIPTION

 

 

 

 

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/

22

I/OSD12

Serial Data / SMB Data & Port Non-removable Strap Option

SMBDATA/

 

 

NON_REM1: Non-removable port strap

NON_REM1

 

 

 

 

 

option.

 

 

 

If this strap is enabled by package and configuration settings

 

 

 

(see Table 3.2), 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/

24

I/OSD12

Serial Clock (SCL)

 

 

 

 

SMBCLK/

 

 

SMBus Clock (SMBCLK)

 

 

 

 

CFG_SEL0

 

 

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/

25

I/O12

Hi-Speed Upstream port indicator & Configuration

CFG_SEL1

 

 

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

 

 

 

 

XTAL1/

33

ICLKx

Crystal Input/External Clock Input

CLKIN

 

 

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.

 

 

 

 

SMSC USB2512A

9

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DATASHEET

 

 

 

 

USB 2.0 Hi-Speed 2-Port Hub Controller

 

 

 

Datasheet

 

Table 3.1 USB2512A Pin Descriptions (continued)

 

 

 

 

 

QFN-36

BUFFER

 

SYMBOL

EMB

TYPE

DESCRIPTION

 

 

 

 

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 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/

28

I/O

Active/Suspend status LED or Local-Power & Non-removable

LOCAL_PWR/

 

 

Strap Option

NON_REM0

 

 

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), 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.

 

 

 

 

Revision 1.96 (07-11-08)

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USB 2.0 Hi-Speed 2-Port Hub Controller

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

 

 

 

 

 

 

 

1

 

1

 

2-Wire I2C EEPROMS are supported.

 

 

 

 

 

 

Strap Options Disabled

 

 

 

 

 

 

All Settings Controlled by Registers

 

 

 

 

 

 

 

 

 

Table 3.3 USB2512A 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.

 

 

 

 

 

 

VDDPLL18

 

34

 

 

VDD PLL

 

 

 

 

 

 

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

 

 

 

 

 

 

VSS.

 

 

 

 

 

 

VDDA33

 

5

 

 

VDD Analog I/O

 

 

 

10

 

 

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

 

 

 

29

 

 

 

 

 

 

 

 

VDD33/VDD33CR

 

23

 

 

VDDIO/VDD 3.3 Core Regulator Reference

 

 

 

15

 

 

+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

 

 

No trace or signal should be routed or attached to these pins.

 

 

 

8

 

 

 

 

 

9

 

 

 

 

 

 

18

 

 

 

 

 

 

19

 

 

 

 

 

 

20

 

 

 

 

 

 

21

 

 

 

 

 

 

 

 

 

 

SMSC USB2512A

11

Revision 1.96 (07-11-08)

 

DATASHEET

 

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

3.2Buffer Type Descriptions

 

Table 3.4 USB2512A 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 with 12mA sink.

 

 

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.

 

 

AIO

Analog Input/Output.

 

 

Revision 1.96 (07-11-08)

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SMSC USB2512A

 

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