SMSC USB2422T-I/MJ

USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
PRODUCT FEATURES
Datasheet
General Description
Highlights
The SMSC USB2422 hub is a low-power, single transaction
translator, hub controller IC with two downstream ports for
embedded USB solutions. The SMSC hub controller can
attach to an upstream port as a Hi-Speed and Full-Speed
hub or as a Full-Speed only hub. The SMSC hub supports
Low-Speed, Full-Speed, and Hi-Speed (when configured as
a Hi-Speed hub) downstream devices on the enabled
downstream ports.
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All required resistors on the USB ports are integrated into
the hub. This includes all series termination resistors on D+
and D- pins and all required pull-down and pull-up resistors
on D+ and D- pins. The over-current sense inputs for the
downstream facing ports have internal pull-up resistors.
Applications
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Features
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Supports the USB Battery Charging Specification,
Revision 1.1
Fully integrated USB termination and pull-up/pulldown resistors
Supports a single external 3.3 V supply source;
internal regulators provide 1.2 V internal core voltage
On-chip driver for 24 MHz crystal resonator or
external 24 MHz clock input
ESD protection up to 6 kV on all USB pins
Supports self-powered operation
SMSC hub contains a built-in default configuration;
no external configuration options or components are
required
Downstream ports as non-removable ports
Downstream port power control and over-current
detection on an individual or ganged basis
Supports compound devices on a port-by-port basis
24-pin SQFN (4x4 mm), RoHS-compliant package
Commercial temperature range support:
0ºC to +70ºC
Industrial temperature range support:
-40ºC to +85ºC
SMSC USB2422
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High performance, low-power, small footprint hub
controller IC with two downstream ports
Fully compliant with the USB 2.0 Specification
Optimized for minimal bill-of-materials and low-cost
designs
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
Gaming consoles
Cable/DSL modems
HDD enclosures
KVM switches
Server front panels
Point-of-Sale (POS) systems
IP telephony
Automobile/home audio systems
Thin client terminals
DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Order Numbers:
ORDER NUMBERS
ROHS COMPLIANT
PACKAGE
USB2422/MJ
USB2422T/MJ
USB2422-I/MJ
24-Pin SQFN
4 x 4 mm
USB2422T-I/MJ
TEMP. RANGE
REEL SIZE
0ºC to +70ºC
-
0ºC to +70ºC
4000
-40ºC to +85ºC
-
-40ºC to +85ºC
4000
This product meets the halogen maximum concentration values per IEC61249-2-21
For RoHS compliance and environmental information, please visit www.smsc.com/rohs
Please contact your SMSC sales representative for additional documentation related to this product
such as application notes, anomaly sheets, and design guidelines.
Copyright © 2013 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.
The Microchip name and logo, and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
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 1.0 (06-04-13)
2
DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Conventions
Within this manual, the following abbreviations and symbols are used to improve readability.
Example
BIT
FIELD.BIT
x…y
BITS[m:n]
PIN
zzzzb
0xzzz
zzh
rsvd
code
Section Name
x
<Parameter>
{,Parameter}
[Parameter]
SMSC USB2422
Description
Name of a single bit within a field
Name of a single bit (BIT) in FIELD
Range from x to y, inclusive
Groups of bits from m to n, inclusive
Pin Name
Binary number (value zzzz)
Hexadecimal number (value zzz)
Hexadecimal number (value zz)
Reserved memory location. Must write 0, read value indeterminate
Instruction code, or API function or parameter
Section or Document name
Don’t care
<> indicate a Parameter is optional or is only used under some conditions
Braces indicate Parameter(s) that repeat one or more times
Brackets indicate a nested Parameter. This Parameter is not real and actually decodes
into one or more real parameters.
3
DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Table of Contents
Chapter 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 2 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1
2.2
2.3
2.4
2.5
2.6
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Pin Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pin Descriptions (Grouped by Function). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Strap Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.1
Non-Removable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.2
Internal Pull-Down (IPD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.5.3
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Example Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chapter 3 Battery Charging Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1
3.2
USB Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1
Special Behavior of PRTPWR Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Charging Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1
Battery Charging Enabled via SMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
18
19
19
Chapter 4 Configuration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1
4.2
4.3
4.4
Hub Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1
External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2
USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1
SMBus Slave Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.2
Protocol Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.3
Slave Device Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.4
Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.5
SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.6
Bus Reset Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.7
SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.1
Vendor ID Least Significant Bit Register (VIDL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.2
Vendor ID Most Significant Bit Register (VIDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.3
Product ID Least Significant Bit Register (PIDL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.4
Product ID Most Significant Bit Register (PIDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.5
Device ID Least Significant Bit Register (DIDL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.6
Device ID Most Significant Bit Register (DIDM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.7
Configuration Data Byte 1 Register (CFG1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.8
Configuration Data Byte 2 Register (CFG2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.9
Configuration Data Byte 3 Register (CFG3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.10 Non-Removable Device Register (NRD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.11 Port Disable for Self-Powered Operation Register (PDS) . . . . . . . . . . . . . . . . . . . . . . . .
4.4.12 Port Disable for Bus-Powered Operation Register (PDB) . . . . . . . . . . . . . . . . . . . . . . . .
4.4.13 Max Power for Self-Powered Operation Register (MAXPS) . . . . . . . . . . . . . . . . . . . . . .
4.4.14 Max Power for Bus-Powered Operation Register (MAXPB) . . . . . . . . . . . . . . . . . . . . . .
4.4.15 Hub Controller Max Current for Self-Powered Operation Register (HCMCS) . . . . . . . . .
4.4.16 Hub Controller Max Power for Bus-Powered Operation Register (HCMCB) . . . . . . . . . .
4.4.17 Power-On Time Register (PWRT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.18 Language ID High Register (LANGIDH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision 1.0 (06-04-13)
4
DATASHEET
20
20
20
21
22
22
22
23
23
23
23
23
24
25
25
26
26
26
26
27
29
30
30
31
31
32
32
32
33
33
33
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.19
4.4.20
4.4.21
4.4.22
4.4.23
4.4.24
4.4.25
4.4.26
4.4.27
4.4.28
4.4.29
4.4.30
4.4.31
Language ID Low Register (LANGIDL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manufacturer String Length Register (MFRSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product String Length Register (PRDSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial String Length Register (SERSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manufacturer String Registers (MANSTR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product String Registers (PRDSTR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial String Registers (SERSTR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Charging Enable Register (BC_EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boost Upstream Register (BOOSTUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boost Downstream Register (BOOST40) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port Swap Register (PRTSP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port 1/2 Remap Register (PRTR12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status/Command Register (STCD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
34
34
34
34
35
35
35
36
36
37
38
39
Chapter 5 DC Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.1
5.2
Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.2.1
Pin Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Chapter 6 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1
6.2
6.3
Oscillator/Crystal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2.1
USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44
45
45
45
Chapter 7 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Chapter 8 Datasheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
SMSC USB2422
5
DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
List of Figures
Figure 1.1
Figure 2.1
Figure 2.2
Figure 2.3
Figure 2.4
Figure 2.5
Figure 2.6
Figure 3.1
Figure 4.1
Figure 4.2
Figure 4.3
Figure 5.1
Figure 6.1
Figure 6.2
Figure 7.1
Figure 7.2
Figure 7.3
Figure 7.4
Figure 7.5
USB2422 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
USB2422 24-Pin SQFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Non-Removable Pin Strap Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
IPD Pin Strap Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
LED Pin Strap Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Example Application - SoC Based Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Example Application - Non-SoC Based Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Battery Charging via External Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Hub Configuration Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Block Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Block Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Supply Rise Time Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Formula to Find the Value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
24-SQFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Recommended PCB Land Pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Taping Dimensions and Part Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Reel Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Tape Length and Part Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
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6
DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
List of Tables
Table 2.1
Table 2.2
Table 2.3
Table 2.4
Table 2.5
Table 4.1
Table 4.2
Table 5.1
Table 5.2
Table 6.1
Table 7.1
Table 8.1
USB2422 Pin Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
USB2422 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Strap Option Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example Applications - Resistor/Capacitor Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hub Configuration Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crystal Circuit Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24-SQFN Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMSC USB2422
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DATASHEET
10
11
14
14
17
20
21
41
43
44
46
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Datasheet
Chapter 1 Block Diagram
To Upstream Upstream USB
VBUS
Data
CRFILT PLLFILT
24 MHz Crystal
SMBDATA SMBCLK
3.3V
PLL
Bus-Power
Detect/VBUS
Pulse
To
SMBus Master
Upstream
PHY
Serial
Interface
1.2V Reg
SIE
Repeater
Controller
Port
Controller
TT
Routing & Port Re-Ordering
Logic
Port #1
PHY#1
USB Data
Downstream
Port #2
OC
Sense
Switch
Driver
PHY#2
USB Data
OC Sense
Switch
Downstream
OC
Sense
Switch
Driver
OC Sense
Switch
Figure 1.1 USB2422 Block Diagram
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 2 Pin Descriptions
This chapter is organized by a set of pin configurations followed by a corresponding pin list organized
by function according to their associated interface. A detailed description list of each signal (named in
the pin list) is organized by function in Table 2.2, “USB2422 Pin Descriptions,” on page 11. Refer to
Table 2.3, “Buffer Type Descriptions,” on page 14 for a list of buffer types.
An N at the end of a signal name indicates that the active (asserted) state occurs when the signal is
at a low voltage level. When the N is not present, the signal is asserted when it is at a high voltage
level. The terms assertion and negation are used exclusively in order 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.
VDD33
SUSP_IND/LOCAL_PWR/(NON_REM0)
VBUS_DET
RESET_N
SMBCLK/CFG_SEL0
SMBDATA/NON_REM1
18
17
16
15
14
13
Pin Configuration
USBDM_UP
19
12
OCS2_N
USBDP_UP
20
11
PRTPWR2
4
5
6
USBDM_DN2/PRT_DIS_M2
USBDP_DN2/PRT_DIS_P2
NC
24
3
RBIAS
Thermal Slug
(must be connected to VSS)
USBDP_DN1/PRT_DIS_P1
23
2
PLLFILT
USBDM_DN1/PRT_DIS_M1
XTALIN/CLKIN
1
XTALOUT/(CLKIN_EN)
SMSC
21
10
USB2422
22 (Top View SQFN-24) 9
VDD33
2.1
CRFILT
VDD33
8
OCS1_N
7
PRTPWR1/(BC_EN1)
Indicates pins on the bottom of the device.
Figure 2.1 USB2422 24-Pin SQFN
SMSC USB2422
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Datasheet
2.2
Pin Table
Table 2.1 USB2422 Pin Table
UPSTREAM USB 2.0 INTERFACES (3 PINS)
USBDM_UP
VBUS_DET
USBDM_UP
DOWNSTREAM 2-PORT USB 2.0 INTERFACES (9 PINS)
USBDP_DN1/
PRT_DIS_P1
USBDM_DN1/
PRT_DIS_M1
USBDP_DN2/
PRT_DIS_P2
USBDM_DN2/
PRT_DIS_M2
PRTPWR1/
BC_EN1
PRTPWR2
OCS1_N
OCS2_N
RBIAS
SERIAL PORT INTERFACE (2 PINS)
SMBDATA/
NON_REM1
SMBCLK/
CFG_SEL
MISC (5 PINS)
XTALIN/
CLKIN
XTALOUT/
CLKIN_EN
RESET_N
SUSP_IND/
LOCAL_PWR/
NON_REM0
NC
POWER, GROUND, AND NO CONNECTS (5 PINS)
(3) VDD33
CRFILT
PLLFILT
VSS
TOTAL 24
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
2.3
Pin Descriptions (Grouped by Function)
Table 2.2 USB2422 Pin Descriptions
PIN
#
SYMBOL
BUFFER
TYPE
DESCRIPTION
UPSTREAM USB 2.0 INTERFACES
19
20
USBDM_UP
USBDP_UP
IO-U
16
VBUS_DET
I
USB Bus Data:
Connect to the upstream USB bus data signals (host, port, or
upstream hub).
Detect Upstream VBUS Power:
Detects the state of upstream VBUS power. The SMSC hub monitors
VBUS_DET to determine when to assert the internal D+ pull-up
resistor (signalling a connect event)
When designing a detachable hub, this pin should be connected to
VBUS on the upstream port via a 2:1 voltage divider. Two 100 kΩ
resistors are suggested.
For self-powered applications with a permanently attached host, this
pin must be connected to a dedicated host control output, or
connected to the 3.3 V domain that powers the host (typically VDD33).
DOWNSTREAM USB 2.0 INTERFACES
5
3
and
4
2
USBDP_DN[2:1]/
PRT_DIS_P[2:1]
and
USBDN_DN[2:1]/
PRT_DIS_M[2:1]
IO-U
Hi-Speed USB Data:
Connect to the downstream USB peripheral devices attached to the
hub’s ports.
Port Disable Strap Option:
If this strap is enabled by package and configuration settings (see
Table 4.1, "Hub Configuration Options"), this pin will be sampled at
RESET_N negation to determine if the port is disabled.
Both USB data pins for the corresponding port must be tied to VDD33
to disable the associated downstream port.
7
PRTPWR1/
O12
USB Power Enable:
Enables power to USB peripheral devices that are downstream, where
the hub supports active high power controllers only.
BC_EN1
IPD
Battery Charging Strap Option:
Port 1 pin will be sampled at RESET_N negation to determine if port
1 supports the battery charging protocol (and thus the supporting
external port power controllers) that would enable a device to draw the
currents per the USB Battery Charging Specification.
This pin has an internal pull-down that will be removed after the strap
option hold time is completed.
BC_EN1= 1: Battery charging feature is supported for port 1
BC_EN1= 0: Battery charging feature is not supported for port 1
11
PRTPWR2
O12
USB Power Enable:
Enables power to USB peripheral devices that are downstream, where
the hub supports active high power controllers only.
8
12
OCS1_N
OCS2_N
SMSC USB2422
IPU
Over-Current Sense:
Input from external current monitor indicating an over-current
condition. This pin contains an internal pull-up to the 3.3 V supply.
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Table 2.2 USB2422 Pin Descriptions (continued)
PIN
#
SYMBOL
BUFFER
TYPE
24
RBIAS
I-R
DESCRIPTION
USB Transceiver Bias:
A12.0 kΩ (+/- 1%) resistor is attached from ground to this pin to set
the transceiver’s internal bias settings.
SERIAL PORT INTERFACE
13
SMBDATA
I/OSD12
NON_REM1
System Management Bus Data
Non-removable Port Strap Option:
This pin is sampled (in conjunction with SUSP_IND/NON_REM0) at
RESET_N negation to determine if ports [2:1] contain permanently
attached (non-removable) devices:
NON_REM[1:0]
NON_REM[1:0]
NON_REM[1:0]
NON_REM[1:0]
=
=
=
=
00:
01:
10:
11:
all ports are removable
port 1 is non-removable
ports 1 and 2 are non-removable
reserved
See Section 2.5, "Strap Pin Configuration" for details.
14
SMBCLK/
I/OSD12
CFG_SEL
System Management Bus Clock
Configuration Select:
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 4.1.
MISC
22
21
XTALIN/
CLKIN
ICLKx
XTALOUT
OCLKx
24 MHz Crystal or External Clock Input:
This pin connects to either one terminal of the crystal or to an external
24 MHz clock when a crystal is not used.
Crystal Output:
This is the other terminal of the crystal circuit with 1.2 V p-p output and
a weak (< 1 mA) driving strength. When an external clock source is
used to drive XTALIN/CLKIN, leave this pin unconnected, or use with
appropriate caution.
15
RESET_N
IS
RESET Input:
The system must reset the chip by driving this input low. The minimum
active low pulse is 1 μs.
6
NC
Revision 1.0 (06-04-13)
IPD
Treat as a no connect pin or connect to ground. No trace or signal
should be routed or attached to this pin.
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Table 2.2 USB2422 Pin Descriptions (continued)
PIN
#
SYMBOL
BUFFER
TYPE
17
SUSP_IND
I/O12
DESCRIPTION
Suspend Indicator:
Indicates the 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_PWR
Local Power:
This input selects whether the hub reports itself as bus or self-powered
when dynamic power switching is enabled via the Dynamic Power
Enable (DYNAMIC) bit of the Configuration Data Byte 2 Register
(CFG2). This pin is sampled at POR/Reset before the USB Hub Attach
command is sent. Once the hub has entered the attach state (as
indicated by the USB Attach and Write Protect (USB_ATTACH) bit of
the Status/Command Register (STCD)), this pin cannot be changed.
Low : self/local power source is not available (i.e., the Hub gets all
power from the upstream USB VBus).
High : self/local power source is available.
(NON_REM0)
Note:
Never tie this pin directly to VDD33, as doing so may cause
it to act as SUSP_IND.
Note:
This pin assumes the meaning of local power input only if
properly configured via SMBus. If the hub is configured via
straps, it is NON_REM0 at reset and SUSP_IND after reset.
Non-Removable Port Strap Option:
This pin is sampled (in conjunction with SUSP_IND/NON_REM0) at
RESET_N negation to determine if ports [2:1] contain permanently
attached (non-removable) devices:
NON_REM[1:0]
NON_REM[1:0]
NON_REM[1:0]
NON_REM[1:0]
=
=
=
=
00:
01:
10:
11:
all ports are removable
port 1 is non-removable
ports 1 and 2 are non-removable
reserved
See Section 2.5, "Strap Pin Configuration" for details.
POWER, GROUND, and NO CONNECTS
1
9
18
VDD33
10
CRFILT
3.3 V power to the chip.
A 1.0 μF low-ESR capacitor to VSS is required on pin 9 as close as
possible to the pin. A 0.1 μF low-ESR capacitor to VSS is required on
pin 1 as close as possible to the pin.
VDD Core Regulator Filter Capacitor:
This pin requires a 1.0 μF low-ESR capacitor to VSS for proper
operation.
23
PLLFILT
PLL Regulator Filter Capacitor:
This pin can have up to a 0.1 μF low-ESR capacitor to VSS, or be left
unconnected.
VSS
Ground Pad/ePad:
The package slug is the only VSS for the device and must be tied to
ground with multiple vias.
SMSC USB2422
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Datasheet
2.4
Buffer Type Descriptions
Table 2.3 Buffer Type Descriptions
BUFFER
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
I/O12
Input/Output buffer with 12 mA sink and 12 mA source
ICLKx
XTAL clock input
OCLKx
XTAL clock output
I-R
RBIAS
I/O-U
2.5
DESCRIPTION
Analog Input/Output defined in USB specification
Strap Pin Configuration
If a pin's strap function is enabled through hub configuration selection (Table 4.1), the strap pins must
be pulled either high or low using the values provided in Table 2.4. Each strap option is dependent on
the pin’s buffer type, as outlined in the sections that follow.
Table 2.4 Strap Option Summary
STRAP OPTION
Non-Removable
Internal Pull-Down
(IPD)
LED
2.5.1
RESISTOR VALUE
BUFFER TYPE
47 - 100 kΩ
I/O
10 kΩ
IPD
47 - 100 kΩ
I/O
NOTES


Only applicable to port power pins
Contains a built-in resistor
Non-Removable
If a strap pin’s buffer type is I/O, an external pull-up or pull-down must be implemented as shown in
Figure 2.2. Use Strap High to set the strap option to 1 and Strap Low to set the strap option to 0. When
implementing the Strap Low option, no additional components are needed (i.e., the internal pull-down
provides the resistor)
+V
R kΩ
I/O Strap Pin
Strap High
I/O Strap Pin
HUB
HUB
Strap Low
R kΩ
GND
Figure 2.2 Non-Removable Pin Strap Example
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Datasheet
2.5.2
Internal Pull-Down (IPD)
If a strap pin’s buffer type is IPD, one of the two hardware configurations outlined in Figure 2.3 must
be implemented. Use the Strap High configuration to set the strap option value to 1 and Strap Low to
set the strap option value to 0.
+V
R kΩ
IPD Strap Pin
Strap High
IPD Strap Pin
HUB
Strap Low
HUB
VSS
VSS
Figure 2.3 IPD Pin Strap Example
2.5.3
LED
If a strap pin’s buffer type is I/O and shares functionality with an LED, the hardware configuration
outlined below must be implemented. The internal logic will drive the LED appropriately (active high or
low) depending on the sampled strap option. Use the Strap High configuration to set the strap option
value to 1 and Strap Low to set the strap option to 0.
R
kΩ
LED/
Strap High
Strap Pin
Strap Pin
HUB
HUB
R
kΩ
LED/
Strap Low
Figure 2.4 LED Pin Strap Example
SMSC USB2422
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
2.6
Example Applications
Figure 2.5 and Figure 2.6 depict example applications for an SoC based design and a non-SoC based
design, respectively. The corresponding resistor and capacitor values for these examples are provided
in Table 2.5.
USB
Connector
USB2422
RVBUS
RVBUS
Enable
VBUS_DET
USBDP_UP
USBDM_UP
USB Switch
PRTPWR1
OCS1_N
FAULT_N
Connector
USBDP_DN1
USBDM_DN1
PRTPWR2(11)
OCS2_N(12)
USBDP_DN2
USBDM_DN2
Vcc
RESET_N
Embedded
Device
3.3V
SMBCLK
SOC
VDD33 (1,9,18)
SMBDATA
Clock
N/C
RESET_N
PLLFILT
SUSP_IND
CRFILT
RBIAS
RBIAS
CBYP
XTALOUT
XTALIN
COUTCR
COUTPLL
GND
Figure 2.5 Example Application - SoC Based Design
USB
Connector
USB2422
RVBUS
RVBUS
PRTPWR2(11)
OCS2_N(12)
VBUS_DET
USBDP_DN2
USBDP_UP
USBDM_DN2
USBDM_UP
Vcc
R2
NON_REM0(17)
RESET_N
CFG_SEL0(14)
Vcc
R1
PRTPWR1
OCS1_N
USBDP_DN1
USBDM_DN1
Power
Switch
Charger
Enabled
Port
Vcc
VDD33 (1,9,18)
NON_REM1(13)
N/C
R2
R2
Non-removable
Device
PLLFILT
CRFILT
RBIAS
Cx
RBIAS
XTAL1(22)
CBYP
COUTCR
COUTPLL
24MHz
XTAL2(21)
GND
Cx
Figure 2.6 Example Application - Non-SoC Based Design
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Datasheet
Table 2.5 Example Applications - Resistor/Capacitor Values
DESIGNATOR
VALUE
R1
20 kΩ
R2
50 kΩ
Cx
18 pF
CBYP
1.0 uF
1.0 uF
COUTCR
(Note 2.1)
COUTPLL
0.1 uF
(Note 2.2)
RBIAS
12 kΩ
RVBUS
100 kΩ
Note 2.1
COUTCR should be placed as close as possible to pin 9
Note 2.2
COUTPLL should be placed as close as possible to pin 1
SMSC USB2422
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Datasheet
Chapter 3 Battery Charging Support
The USB2422 SMSC hub provides support for battery charging devices on a per port basis in
compliance with the USB Battery Charging Specification, Revision 1.1. The hub can be configured to
individually enable each downstream port for battery charging support either via pin strapping (Port 1
only) as illustrated in Figure 3.1 or by setting the corresponding configuration bits via SMBus (Section
4.1 on page 20).
3.3 V
5.0 V
USB Port Power
Controller
RSTRAP
IN
USB2422
PRTPWR1
OCSx_N
EN
VBUS
FLAG
Figure 3.1 Battery Charging via External Power Supply
Note: RSTRAP enables battery charging.
3.1
USB Battery Charging
A downstream port enabled for battery charging turns on port power as soon as the power on reset
and hardware configuration process has completed. The hub does not need to be enumerated nor
does VBUS_DET need to be asserted for the port power to be enabled. These conditions allow battery
charging in S3, S4, and S5 system power states as well as in the fully operational state. The USB
Battery Charging Specification does not interfere with standard USB operation, which allows a device
to perform battery charging at any time.
A port that supports battery charging must be able to support 1.5 amps of current on VBUS. Standard
USB port power controllers typically only allow for 0.8 amps of current before detecting an over-current
condition. Therefore, the 5 volt power supply, port power controller, or over-current protection devices
must be chosen to handle the larger current demand compared to standard USB hub designs.
3.1.1
Special Behavior of PRTPWR Pins
The USB2422 enables VBUS by asserting the port power (PRTPWR[2:1]) as soon as the hardware
configuration process has completed. If the port detects an over-current condition, PRTPWR[2:1] will
be turned off to protect the circuitry from overloading. If an over-current condition is detected when the
hub is not enumerated, PRTPWR[2:1] can only be turned on from the host or if RESET_N is toggled.
These behaviors provide battery charging even when the hub is not enumerated and protect the hub
from sustained short circuit conditions. If the short circuit condition persists when the hub is plugged
into a host system the user is notified that a port has an over-current condition. Otherwise
PRTPWR[2:1] turned on by the host system and the ports operate normally.
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Datasheet
3.2
Battery Charging Configuration
The battery charging option can be configured in one of two ways:
3.2.1

When the hub is brought up in the default configuration with strapping options enabled, with the
PRTPWR1/BC_EN1 pin configured (Port 1 only). See the following sections for details:
Section 2.3: Pin Descriptions (Grouped by Function) on page 11
Section 2.5: Strap Pin Configuration on page 14

When the hub is initialized for configuration over SMBus.
Battery Charging Enabled via SMBus
Register memory map location 0xD0 is allocated for battery charging support. The Battery Charging
register at location 0xD0 starting from bit 1 enables battery charging for each downstream port when
asserted. Bit 1 represents port 1, and bit 2 represents port 2. Each port that has battery charging
enabled asserts the corresponding PRTPWR[2:1] pin.
SMSC USB2422
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 4 Configuration Options
SMSC’s USB 2.0 hub is fully compliant with the USB Specification [1]. Refer to Chapter 10 (Hub
Specification) for general details regarding hub operation and functionality.
The hub provides one Transaction Translator (TT) that is shared by both downstream ports (defined
as Single-TT configuration). The TT contains 4 non-periodic buffers.
4.1
Hub Configuration
The USB2422 only supports internal defaults with the exception of the non-removable strap option
(using NON_REM[1:0]). The hub internal default settings are as follows:

Internal Default Configuration without over-rides

Strap options enabled

Self-powered operation enabled

Individual power switching

Individual over-current sensing
Table 4.1 Hub Configuration Options
CFG_SEL
4.2
DESCRIPTION
0
Default configuration:
 Strap options enabled
 Hub descriptors indicate the hub as “self-powered”
1
The hub is configured externally over SMBus (as an SMBus
slave device with address 0101100b):
 Strap options disabled
 Self-powered or bus-powered depending on register
settings
 All registers configured over SMBus
Resets
There are two device resets: a hardware reset via RESET_N, and a USB Bus Reset.
4.2.1
External Hardware RESET_N
A valid hardware reset is defined as assertion of RESET_N for a minimum of 1 μs after all power
supplies are within operating range. While reset is asserted, the hub (and its associated external
circuitry) consumes less than 500 μA of current from the upstream USB power source.
Assertion of RESET_N causes the following:
1. All downstream ports are disabled.
2. The PRTPWR power to downstream devices is turned on when battery charging is enabled for a
specific port, and removed when battery charging is disabled for a specific port.
3. The PHYs are disabled, and the differential pairs will be in a high-impedance state.
4. All transactions immediately terminate; no states are saved.
5. All internal registers return to the default state (in most cases, 00h).
6. The external crystal oscillator is halted.
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Datasheet
7. The PLL is halted.
4.2.1.1
Hub Configuration Timing for Strapping Option
Hardware
reset asserted
Read
NON_REM[1:0]
Drive Strap
Outputs to
inactive levels
t1
Attach
USB
Upstream
Attach
Debounce
Interval
Idle
t7
t6
t5
Start completion
request response
t8
t2
t3
RESET_N
VSS
t4
NON_REM[1:0]
Don’t Care
Valid
Driven by Hub if strap is an output
Don’t Care
VSS
Figure 4.1 Hub Configuration Timing
Table 4.2 Hub Configuration Timing
NAME
DESCRIPTION
MIN
TYP
MAX
UNITS
1
μsec
Strap setup time
16.7
nsec
t3
Strap hold time
16.7
t4
Hub outputs driven to inactive logic states
t5
USB attach (See Note)
t6
Host acknowledges attach and signals USB reset
t7
USB idle
t8
Completion time for requests (with or without data
stage)
t1
RESET_N asserted
t2
1.5
1400
nsec
2
μsec
μsec
3
100
msec
undefined
msec
5
msec
Note: All power supplies must have reached the operating levels mandated in Chapter 5, DC
Parameters, prior to (or coincident with) the assertion of RESET_N.
4.2.2
USB Bus Reset
In response to the upstream port signaling a reset to the hub, the hub does the following:
1. Sets default address to 0.
2. Sets configuration to unconfigured.
3. The PRTPWR power to downstream devices is turned on when battery charging is enabled for a
specific port, and removed when battery charging is disabled for a specific port.
4. Clears all TT buffers.
5. Moves device from suspended to active (if suspended).
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Datasheet
6. Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the reset
sequence. The host then configures the hub and the hub’s downstream port devices in accordance
with the specification.
The hub does not propagate the upstream USB reset to downstream devices.
4.3
SMBus
The SMSC hub can be configured by an external processor via an SMBus interface (see Table 4.1 for
details on enabling the SMBus interface). The SMSC hub waits indefinitely for the SMBus code load
to complete and only appears as a newly connected device on USB after the code load is complete.
The hub’s SMBus acts as a slave-only SMBus device. The implementation only supports block write
(Section 4.3.2.1) and block read (Section 4.3.2.2) protocols. Reference the System Management Bus
Specification [2] for additional information.
Refer to Section 4.4, "SMBus Registers," on page 24 for details on all SMBus accessible registers.
4.3.1
SMBus Slave Address
The 7-bit slave address is 0101100b. The hub will not respond to the general call address of 0000000b.
4.3.2
Protocol Implementation
Typical block write and block read protocols are shown in figures 4.2 and 4.3. Register accesses are
performed using 7-bit slave addressing, an 8-bit register address field, and an 8-bit data field. The
shading shown in the figures during a read or write indicates the hub is driving data on the SMBDATA
line; otherwise, host data is on the SMBDATA line.
The SMBus slave address assigned to the hub (0101100b) allows it to be identified on the SMBus.
The register address field is the internal address of the register to be accessed. The register data field
is the data that the host is attempting to write to the register or the contents of the register that the
host is attempting to read.
Note: Data bytes are transferred MSB first.
4.3.2.1
Block Write/Read
The block write begins with a slave address and a write condition. After the command code, the host
issues a byte count which describes how many more bytes will follow in the message. If a slave had
20 bytes to send, the first byte would be the number 20 (14h), followed by the 20 bytes of data. The
byte count may not be zero. A block write or read allows a transfer maximum of 32 data bytes.
Note: For the following SMBus tables:
Denotes Master-to-Slave
Denotes Slave-to-Master
1
7
1
1
8
1
S
Slave Address
Wr
A
Register Address
A
...
8
1
8
1
8
1
8
1
1
Byte Count = N
A
Data byte 1
A
Data byte 2
A
Data byte N
A
P
Figure 4.2 Block Write
4.3.2.2
Block Read
A block read differs from a block write in that the repeated start condition exists to satisfy the SMBus
specification’s requirement for a change in the transfer direction.
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
1
7
1
1
8
1
1
7
1
1
S
Slave Address
Wr
A
Register Address
A
S
Slave Address
Rd
A
...
8
1
8
1
8
1
8
1
1
Byte Count = N
A
Data byte 1
A
Data byte 2
A
Data byte N
A
P
Figure 4.3 Block Read
4.3.2.3
Invalid Protocol Response Behavior
Note that any attempt to update registers with an invalid protocol will not be updated. The only valid
protocols are write block and read block (described above), where the hub only responds to the 7-bit
hardware selected slave address (0101100b).
4.3.3
Slave Device Timeout
Devices in a transfer can abort the transfer in progress and release the bus when any single clock low
interval exceeds 25 ms (TTIMEOUT, MIN). The master must detect this condition and generate a stop
condition within or after the transfer of the interrupted data byte. Slave devices must reset their
communication and be able to receive a new START condition no later than 35 ms (TTIMEOUT, MAX).
Note: Some simple devices do not contain a clock low drive circuit; this simple kind of device typically
resets its communications port after a start or stop condition. The slave device timeout must
be implemented.
4.3.4
Stretching the SCLK Signal
The hub supports stretching of the SCLK by other devices on the SMBus. However, the hub does not
stretch the SCLK.
4.3.5
SMBus Timing
The SMBus slave interface complies with the SMBus Specification Revision 1.0 [2]. See Section 2.1,
AC Specifications on page 3 for more information.
4.3.6
Bus Reset Sequence
The SMBus slave interface resets and returns to the idle state upon a START condition followed
immediately by a STOP condition.
4.3.7
SMBus Alert Response Address
The SMBALERT# signal is not supported by the hub.
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2-Port USB 2.0 Hi-Speed Hub Controller
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4.4
SMBus Registers
This section details the device SMBus registers.
Note: Internal Default ROM values are not visible to THE SMBus interface and cannot be read. When
the hub is configured for SMBus register load, the entire register set must be written.
Table 4.3 Internal Default and SMBus Register Memory Map
INTERNAL
DEFAULT
ROM
SMBUS &
EEPROM
DEFAULT
Vendor ID Least Significant Bit Register (VIDL)
24h
00h
R/W
Vendor ID Most Significant Bit Register (VIDM)
04h
00h
02h
R/W
Product ID Least Significant Bit Register (PIDL)
22h
00h
03h
R/W
Product ID Most Significant Bit Register (PIDM)
24h
00h
04h
R/W
Device ID Least Significant Bit Register (DIDL)
A0h
00h
05h
R/W
Device ID Most Significant Bit Register (DIDM)
00h
00h
06h
R/W
Configuration Data Byte 1 Register (CFG1)
8Bh
00h
07h
R/W
Configuration Data Byte 2 Register (CFG2)
20h
00h
08h
R/W
Configuration Data Byte 3 Register (CFG3)
02h
00h
09h
R/W
Non-Removable Device Register (NRD)
00h
00h
0Ah
R/W
Port Disable for Self-Powered Operation Register (PDS)
00h
00h
0Bh
R/W
Port Disable for Bus-Powered Operation Register (PDB)
00h
00h
0Ch
R/W
Max Power for Self-Powered Operation Register (MAXPS)
01h
00h
0Dh
R/W
Max Power for Bus-Powered Operation Register (MAXPB)
32h
00h
0Eh
R/W
Hub Controller Max Current for Self-Powered Operation Register
(HCMCS)
01h
00h
0Fh
R/W
Hub Controller Max Power for Bus-Powered Operation Register
(HCMCB)
32h
00h
10h
R/W
Power-On Time Register (PWRT)
32h
00h
11h
R/W
Language ID High Register (LANGIDH)
00h
00h
12h
R/W
Language ID Low Register (LANGIDL)
00h
00h
13h
R/W
Manufacturer String Length Register (MFRSL)
00h
00h
14h
R/W
Product String Length Register (PRDSL)
00h
00h
15h
R/W
Serial String Length Register (SERSL)
00h
00h
16h-53h
R/W
Manufacturer String Registers (MANSTR)
00h
00h
54h-91h
R/W
Product String Registers (PRDSTR)
00h
00h
92h-CFh
R/W
Serial String Registers (SERSTR)
00h
00h
D0h
R/W
Battery Charging Enable Register (BC_EN)
00h
00h
E0h-F5h
-
-
-
REG.
ADDRESS
TYPE
00h
R/W
01h
Revision 1.0 (06-04-13)
REGISTER NAME
RESERVED
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Table 4.3 Internal Default and SMBus Register Memory Map (continued)
REG.
ADDRESS
TYPE
F6h
R/W
F7h
-
F8h
R/W
F9h
-
FAh
R/W
FBh
R/W
FCh-FEh
-
FFh
R/W
4.4.1
INTERNAL
DEFAULT
ROM
SMBUS &
EEPROM
DEFAULT
00h
00h
-
-
00h
00h
-
-
Port Swap Register (PRTSP)
00h
00h
Port 1/2 Remap Register (PRTR12)
00h
00h
-
-
00h
00h
REGISTER NAME
Boost Upstream Register (BOOSTUP)
RESERVED
Boost Downstream Register (BOOST40)
RESERVED
RESERVED
Status/Command Register (STCD)
Vendor ID Least Significant Bit Register (VIDL)
Offset:
00h
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Least Significant Byte of the Vendor ID (VID_LSB)
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 the
SMBus interface option.
R/W
00h
4.4.2
Vendor ID Most Significant Bit Register (VIDM)
Address:
01h
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Most Significant Byte of the Vendor ID (VID_LSB)
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 the
SMBus interface options.
R/W
00h
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2-Port USB 2.0 Hi-Speed Hub Controller
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4.4.3
Product ID Least Significant Bit Register (PIDL)
Address:
02h
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Least Significant Byte of the Product ID (PID_LSB)
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 the
SMBus interface options.
R/W
00h
4.4.4
Product ID Most Significant Bit Register (PIDM)
Address:
03h
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Most Significant Byte of the Product ID (PID_LSB)
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 SMBus interface options.
R/W
00h
4.4.5
Device ID Least Significant Bit Register (DIDL)
Address:
04h
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Least Significant Byte of the Device ID (DID_LSB)
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 interface options.
R/W
00h
4.4.6
Device ID Most Significant Bit Register (DIDM)
Address:
05h
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Most Significant Byte of the Device ID (DID_LSB)
This is a 16-bit device release number in BCD format (assigned by OEM).
This field is set by the OEM using the SMBus interface options.
R/W
00h
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.7
Configuration Data Byte 1 Register (CFG1)
Address:
BITS
7
06h
Size:
8 bits
DESCRIPTION
Self or Bus Power (SELF_BUS_PWR)
Selects between Self- and Bus-Powered operation.
TYPE
DEFAULT
R/W
0b
-
-
R/W
0b
R/W
0b
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 Hub consumes less than
100mA of current prior to being configured. After configuration, the BusPowered 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 USB2.0 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 the SMBus interface option.
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
5
High Speed Disable (HS_DISABLE)
Disables the capability to attach as either a High/Full- speed device, and
forces attachment as Full-speed only i.e. (no High-Speed support).
0 = High-/Full-Speed
1 = Full-Speed-Only (High-Speed disabled)
4
Multi-TT Enable (MTT_ENABLE)
Enables one transaction translator per port operation.
Selects between a mode where only one transaction translator is available
for all ports (Single-TT), or each port gets a dedicated transaction translator
(Multi-TT)
Note:
The host may force Single-TT mode only
0 = Single TT for all ports. Default to STT if MTT still exists
1 = One TT per port (multiple TT’s supported)
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BITS
DESCRIPTION
TYPE
DEFAULT
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.
R/W
0b
R/W
00b
R/W
0b
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 = An EOP is generated at the EOF1 point if no traffic is detected
1 = EOP generation at EOF1 is disabled (Note: This is normal USB
operation)
Note:
2:1
This is a rarely used feature in the PC environment. It is included
because it is a permitted feature in Chapter 11 of the USB
specification.
Over Current Sense (CURRENT_SNS)
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 BusPowered configurations)
0
Port Power Switching (PORT_PWR)
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
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.8
Configuration Data Byte 2 Register (CFG2)
Address:
07h
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7
Dynamic Power Enable (DYNAMIC)
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).
R/W
0b
-
-
R/W
00b
R/W
0b
-
-
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 SelfPowered Hub (if local power is available).
0 = No Dynamic auto-switching
(pin becomes SUSP_IND) and the hub controller will utilize the inverse of
the SELF_BUS_PWR bit for 'Hub_Status_Field' bit '0' (local power source)
1 = Dynamic Auto-switching capable
(pin becomes LOCAL_PWR) and the hub controller will utilize the
LOCAL_PWR pin for 'Hub_Status_Field' bit '0' (local power source)
6
5:4
RESERVED
Over Current Timer Delay (OC_TIMER)
00
01
10
11
3
=
=
=
=
0.1ms
4ms
8ms
16ms
Compound Device (COMPOUND)
Allows the 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 nonremovable 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
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.9
Configuration Data Byte 3 Register (CFG3)
Address:
BITS
7:4
3
08h
Size:
8 bits
DESCRIPTION
RESERVED
Port Remapping Enable (PRTMAP_EN)
Selects the method used by the hub to assign port numbers and disable
ports
TYPE
DEFAULT
-
-
R/W
0b
-
-
R/W
0b
TYPE
DEFAULT
R/W
00h
0 = Standard Mode
Strap options or the following registers are used to define which ports are
enabled, and the ports are mapped as Port'n' on the hub is reported as
Port'n' to the host, unless one of the ports is disabled, then the higher
numbered ports are remapped in order to report contiguous port numbers to
the host.
Register 0Ah: Port Disable For Self Powered Operation (Reset = 0x00)
Register 0Bh: Port Disable For Bus Powered Operation (Reset = 0x00).
1 = Port Re-Map mode
The mode enables remapping via Register FBh: Port Remap 12
2:1
0
RESERVED
String Enable (STRING_EN)
Enables string descriptor support.
0 = String support disabled
1 = String support enabled
4.4.10
Non-Removable Device Register (NRD)
Address:
BITS
7:0
09h
Size:
8 bits
DESCRIPTION
Non-Removable Device (NR_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 physical 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
Bit
Bit
Bit
Bit
Bit
Bit
Bit
7=
6=
5=
4=
3=
2=
1=
0=
Reserved
Reserved
Reserved
Reserved
Reserved
Port 2 non-removable
Port 1 non removable
Reserved
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.11
Port Disable for Self-Powered Operation Register (PDS)
Address:
BITS
7:0
0Ah
Size:
8 bits
DESCRIPTION
Port Disable Self-Powered (PORT_DIS_SP)
Disables 1 or more ports.
TYPE
DEFAULT
R/W
00h
0 = port is available
1 = port is disabled
During Self-Powered operation, when 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
Bit
Bit
Bit
Bit
Bit
Bit
Bit
4.4.12
7=
6=
5=
4=
3=
2=
1=
0=
Reserved
Reserved
Reserved
Reserved
Reserved
Port 2 Disable
Port 1 Disable
Reserved
Port Disable for Bus-Powered Operation Register (PDB)
Address:
BITS
7:0
0Bh
Size:
8 bits
DESCRIPTION
Port Disable Bus-Powered (PORT_DIS_BP)
Disables 1 or more ports.
TYPE
DEFAULT
R/W
00h
0 = port is available
1 = port is disabled
During Bus-Powered operation, when 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
Bit
Bit
Bit
Bit
Bit
Bit
Bit
SMSC USB2422
7=
6=
5=
4=
3=
2=
1=
0=
Reserved
Reserved
Reserved
Reserved
Reserved
Port 2 Disable
Port 1 Disable
Reserved
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Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.13
Max Power for Self-Powered Operation Register (MAXPS)
Address:
0Ch
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Max Power Self-Powered (MAX_PWR_SP)
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.
R/W
00h
Note:
4.4.14
The USB2.0 Specification does not permit this value to exceed
100mA.
Max Power for Bus-Powered Operation Register (MAXPB)
Address:
0Dh
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Max Power Bus-Powered (MAX_PWR_BP)
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.
R/W
00h
4.4.15
Hub Controller Max Current for Self-Powered Operation Register
(HCMCS)
Address:
0Eh
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Hub Controller Max Current Self-Powered (HC_MAX_C_SP)
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.
R/W
00h
Note:
The USB2.0 Specification does not permit this value to exceed
100mA.
Revision 1.0 (06-04-13)
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2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.16
Hub Controller Max Power for Bus-Powered Operation Register
(HCMCB)
Address:
0Fh
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Hub Controller Max Power Bus-Powered (MAX_PWR_BP)
Value in 2mA increments that the Hub consumes from an upstream port
(VBUS) when operating as a bus- powered hub. This value will include the
hub silicon along with the combined power consumption (from VBUS) of all
associated circuitry on the board. This value will NOT include the power
consumption of a permanently attached peripheral if the hub is configured
as a compound device.
R/W
00h
4.4.17
Power-On Time Register (PWRT)
Address:
10h
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Power-On Time (POWER_ON_TIME)
The length of time that is takes (in 2 ms intervals) from the time the host
initiated power-on sequence begins on a port until power is good on that
port. System software uses this value to determine how long to wait before
accessing a powered-on port.
R/W
00h
TYPE
DEFAULT
R/W
00h
TYPE
DEFAULT
R/W
00h
4.4.18
Language ID High Register (LANGIDH)
Address:
BITS
7:0
4.4.19
Size:
8 bits
DESCRIPTION
USB Language ID High (LANG_ID_H)
Upper 8 bits of the 16-bit language ID field.
Language ID Low Register (LANGIDL)
Address:
BITS
7:0
11h
12h
Size:
DESCRIPTION
USB Language ID Low (LANG_ID_L)
Lower 8 bits of the 16-bit language ID field.
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DATASHEET
8 bits
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.20
Manufacturer String Length Register (MFRSL)
Address:
BITS
7:0
4.4.21
Size:
DEFAULT
R/W
00h
TYPE
DEFAULT
R/W
00h
TYPE
DEFAULT
R/W
00h
TYPE
DEFAULT
R/W
00h
8 bits
Product String Length (PRD_STR_LEN)
Maximum string length is 31 characters.
Serial String Length Register (SERSL)
15h
Size:
8 bits
DESCRIPTION
Serial String Length (SER_STR_LEN)
Maximum string length is 31 characters.
Manufacturer String Registers (MANSTR)
Address:
BITS
7:0
14h
DESCRIPTION
BITS
4.4.23
TYPE
Product String Length Register (PRDSL)
Address:
7:0
8 bits
Manufacturer String Length (MFR_STR_LEN)
Maximum string length is 31 characters.
BITS
4.4.22
Size:
DESCRIPTION
Address:
7:0
13h
16h-53h
Size:
8 bits
DESCRIPTION
Manufacturer String (MFR_STR)
UNICODE UTF-16LE per USB 2.0 Specification.
Maximum string length is 31 characters (62 Bytes).
Note:
The String consists of individual 16 Bit UNICODE UTF-16LE
characters. The Characters will be stored starting with the LSB at
the least significant address and the MSB at the next 8-bit location
(subsequent characters must be stored in sequential contiguous
address in the same LSB, MSB manner).
Revision 1.0 (06-04-13)
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DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.24
Product String Registers (PRDSTR)
Address:
BITS
7:0
8 bits
Product String (PRD_STR)
UNICODE UTF-16LE per USB 2.0 Specification.
Maximum string length is 31 characters (62 Bytes).
4.4.25
TYPE
DEFAULT
R/W
00h
TYPE
DEFAULT
R/W
00h
TYPE
DEFAULT
R/W
00h
The String consists of individual 16 Bit UNICODE UTF-16LE
characters. The Characters will be stored starting with the LSB at
the least significant address and the MSB at the next 8-bit location
(subsequent characters must be stored in sequential contiguous
address in the same LSB, MSB manner).
Serial String Registers (SERSTR)
Address:
BITS
92h-CFh
Size:
8 bits
DESCRIPTION
Serial String (SER_STR)
UNICODE UTF-16LE per USB 2.0 Specification.
Maximum string length is 31 characters (62 Bytes).
Note:
4.4.26
The String consists of individual 16 Bit UNICODE UTF-16LE
characters. The Characters will be stored starting with the LSB at
the least significant address and the MSB at the next 8-bit location
(subsequent characters must be stored in sequential contiguous
address in the same LSB, MSB manner).
Battery Charging Enable Register (BC_EN)
Address:
BITS
7:0
Size:
DESCRIPTION
Note:
7:0
54h-91h
D0h
Size:
DESCRIPTION
Battery Charging Enable (BC_EN)
Enables the battery charging feature for the corresponding port.
8 bits
0 = Battery Charging support is not enabled
1 = Battery charging support is enabled
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
SMSC USB2422
7=
6=
5=
4=
3=
2=
1=
0=
Reserved
Reserved
Reserved
Reserved
Reserved
Port 2 Battery Charging Enable
Port 1 Battery Charging Enable
Reserved
35
DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.27
Boost Upstream Register (BOOSTUP)
Address:
BITS
F6h
Size:
8 bits
DESCRIPTION
7:2
RESERVED
1:0
Boost Upstream (BOOST_IOUT_A)
USB electrical signaling drive strength Boost Bit for Upstream Port 'A'.
00
01
10
11
4.4.28
=
=
=
=
DEFAULT
-
-
R/W
00b
TYPE
DEFAULT
-
-
R/W
00b
R/W
00b
Normal electrical drive strength
Elevated electrical drive strength (+4% boost)
Elevated electrical drive strength (+8% boost)
Elevated electrical drive strength (+12% boost)
Boost Downstream Register (BOOST40)
Address:
BITS
F8h
Size:
8 bits
DESCRIPTION
7:4
RESERVED
3:2
Boost Downstream Port 2 (BOOST_IOUT_2)
USB electrical signaling drive strength Boost Bit for Upstream Port '2'.
00
01
10
11
1:0
TYPE
=
=
=
=
Normal electrical drive strength
Elevated electrical drive strength (+4% boost)
Elevated electrical drive strength (+8% boost)
Elevated electrical drive strength (+12% boost)
Boost Downstream Port 1 (BOOST_IOUT_1)
USB electrical signaling drive strength Boost Bit for Upstream Port '1'.
00
01
10
11
=
=
=
=
Normal electrical drive strength
Elevated electrical drive strength (+4% boost)
Elevated electrical drive strength (+8% boost)
Elevated electrical drive strength (+12% boost)
Revision 1.0 (06-04-13)
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DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.29
Port Swap Register (PRTSP)
Address:
BITS
7:0
FAh
Size:
8 bits
DESCRIPTION
Port Swap (PRTSP)
Swaps the Upstream and Downstream USB DP and DM Pins for ease of
board routing to devices and connectors.
TYPE
DEFAULT
R/W
00h
0 = USB D+ functionality is associated with the DP pin and Dfunctionality is associated with the DM pin.
1 = USB D+ functionality is associated with the DM pin and Dfunctionality is associated with the DP pin
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
SMSC USB2422
7=
6=
5=
4=
3=
2=
1=
0=
Reserved
Reserved
Reserved
Reserved
Reserved
Port 2 DP/DM Swap
Port 1 DP/DM Swap
Upstream Port DP/DM Swap
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DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.30
Port 1/2 Remap Register (PRTR12)
Address:
FBh
Size:
8 bits
BITS
DESCRIPTION
TYPE
DEFAULT
7:0
Port 1/2 Remap (PRTR12)
When a hub is enumerated by a USB Host Controller, the hub is only
permitted to report how many ports it has, the hub is not permitted to select
a numerical range or assignment. The Host Controller will number the
downstream ports of the hub starting with the number '1', up to the number
of ports that the hub reported as having.
R/W
00h
The host's port number is referred to as “Logical Port Number” and the
physical port on the hub is the “Physical Port Number”. When remapping
mode is enabled (PRTMAP_EN in the Configuration Data Byte 3 Register
(CFG3)), the hub's downstream port numbers can be remapped to different
logical port numbers assigned by the host.
Note:
The OEM must ensure that Contiguous Logical Port Numbers are
used, starting from one up to the maximum number of enabled
ports. This ensures that the hub's ports are numbered in
accordance with the way a Host will communicate with the ports.
Bits[7:4] =
Bits[3:0] =
Revision 1.0 (06-04-13)
0000
Physical Port 2 is disabled
0001
Physical Port 2 is mapped to Logical Port 1
0010
Physical Port 2 is mapped to Logical Port 2
0011
to
1111
RESERVED
Will default to 0000 value.
0000
Physical Port 1 is disabled
0001
Physical Port 1 is mapped to Logical Port 1
0010
Physical Port 1 is mapped to Logical Port 2
0011
to
1111
RESERVED
Will default to 0000 value.
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DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.31
Status/Command Register (STCD)
Address:
BITS
7:3
2
FFh
Size:
8 bits
DESCRIPTION
RESERVED
SMBus Interface Power Down (INTF_PW_DN)
TYPE
DEFAULT
-
-
R/W
0b
R/W
0b
R/W
0b
0 = Interface is active
1 = Interface power down after ACK has completed
Note:
1
This bit is write once and is only cleared by assertion of the
external RESET_N pin.
Reset (RESET)
Resets the SMBus Interface and internal memory back to RESET_N
assertion default settings.
0 = Normal Run/Idle State
1 = Force a reset of the registers to their default state
Note:
0
During this reset, this bit is automatically cleared to its default value
of 0.
USB Attach and Write Protect (USB_ATTACH)
0 = SMBus slave interface is active
1 = Hub will signal a USB attach event to an upstream device, and the
internal memory that is not Modify capable in the address range 00hFEh, is “write-protected” to prevent unintentional data corruption.
Note:
SMSC USB2422
This bit is write once and is only cleared by assertion of the
external RESET_N pin.
39
DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 5 DC Parameters
5.1
Maximum Guaranteed Ratings
PARAMETER
SYMBOL
Storage Temperature
TSTOR
MIN
MAX
-55
UNITS
150
°C
Lead Temperature
3.3 V supply voltage
Refer to JEDEC Specification
J-STD-020D [3]
VDD33
4.6
V
Voltage on any I/O pin
-0.5
5.5
V
Voltage on XTALIN
-0.5
4.0
V
Voltage on XTALOUT
-0.5
2.5
V
5.2
COMMENTS
Note 5.1
Refer to JEDEC Specification J-STD-020D [3].
Note 5.2
Stresses above the specified parameters could cause permanent damage to the device.
This is a stress rating only and functional operation of the device at any condition above
those indicated in the operation sections of this specification is not implied.
Note 5.3
When powering this device from laboratory or system power supplies, it is important that
the absolute maximum ratings not be exceeded or device failure can result. Some power
supplies exhibit voltage spikes on their outputs when the AC power is switched on or off.
In addition, voltage transients on the AC power line may appear on the DC output. When
this possibility exists, it is suggested that a clamp circuit be used.
Operating Conditions
PARAMETER
SYMBOL
MIN
MAX
UNITS
COMMENTS
USB2422 Operating
Temperature
TA
0
70
°C
Ambient temperature in still air
USB2422-i Operating
Temperature
TA
-40
85
°C
Ambient temperature in still air
3.3 V supply voltage
VDD33
3.0
3.6
V
3.3 V supply rise time
tRT33
0
400
μs
See Figure 5.1
-0.3
5.5
V
If any 3.3 V supply voltage drops
below 3.0 V, then the MAX
becomes:
Voltage on any I/O pin
(3.3 V supply voltage) + 0.5
Voltage on XTALIN
Revision 1.0 (06-04-13)
-0.3
VDD12
+ 0.3
40
DATASHEET
V
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Voltage
tRT33
VDD33
3.3 V
100%
90%
VSS
10%
t90%
t10%
Time
Figure 5.1 Supply Rise Time Model
Table 5.1 DC Electrical Characteristics
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
0.8
V
COMMENTS
I, IS Type Input Buffer
Low Input Level
VILI
High Input Level
VIHI
2.0
Input Leakage
IIL
-10
+10
μA
Hysteresis (IS only)
VHYSI
250
350
mV
0.8
V
TTL Levels
V
VIN = 0 to VDD33
Input Buffer with Pull-Up (IPU)
Low Input Level
VILI
High Input Level
VIHI
2.0
Low Input Leakage
IILL
+35
+90
μA
VIN = 0
High Input Leakage
IIHL
-10
+10
μA
VIN = VDD33
0.8
V
TTL Levels
TTL Levels
V
Input Buffer with Pull-Down (IPD)
Low Input Level
VILI
High Input Level
VIHI
2.0
Low Input Leakage
IILL
+10
-10
μA
VIN = 0
High Input Leakage
IIHL
-35
-90
μA
VIN = VDD33
0.3
V
V
ICLK Input Buffer
Low Input Level
VILCK
High Input Level
VIHCK
0.9
Input Leakage
IIL
-10
SMSC USB2422
41
DATASHEET
V
+10
μA
VIN = 0 to VDD33
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Table 5.1 DC Electrical Characteristics (continued)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
0.4
V
COMMENTS
O12, I/O12 & I/OSD12 Type Buffer
Low Output Level
VOL
IOL = 12 mA @
VDD33 = 3.3 V
High Output Level
VOH
2.4
V
IOH = -12 mA @
VDD33 = 3.3 V
Output Leakage
IOL
-10
+10
μA
Hysteresis (SD pad only)
VHYSC
250
350
mV
VIN = VDD33
(Note 5.1)
Supply Current Unconfigured
ICCINTHS
40
45
mA
Supply Current
ICCINTFS
35
40
mA
Note 5.8
Supply Current
IHCH1
47
58
mA
Note 5.8
Supply Current
IHCH2
70
89
mA
Note 5.8
Supply Current
IFCC1
29
40
mA
Note 5.8
Supply Current
IFCC2
35
45
mA
Note 5.8
Supply Current Suspend
ICSBY
425
Note
5.6
μA
Supply Current Reset
ICRST
300
Note
5.7
μA
Hi-Speed Host
Hi-Speed Host, each additional
downstream port
Hi-Speed Host, 1 downstream port
Hi-Speed Host, 2 downstream ports
Full-Speed Host, 1 downstream port
Full-Speed Host, 2 downstream ports
Note 5.4
Output leakage is measured with the current pins in high impedance.
Note 5.5
See USB 2.0 Specification [1] for USB DC electrical characteristics.
Note 5.6
1000 μA for commercial temperature part, and 1200 μA for industrial temperature part.
Note 5.7
800 μA for commercial temperature part, and 1000 μA for industrial temperature part.
Note 5.8
Current measured during peak USB traffic and does not reflect the average current draw.
Revision 1.0 (06-04-13)
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DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
5.2.1
Pin Capacitance
Table 5.2 Pin Capacitance
LIMITS
PARAMETER
Clock Input
Capacitance
Input Capacitance
Output Capacitance
SMSC USB2422
SYMBOL
MIN
TYP
MAX
UNIT
CXTAL
6
pF
All pins except USB pins and the pins
under the test tied to AC ground.
CIN
6
pF
Capacitance TA = 25°C
fc = 1 MHz
VDD33 = 3.3 V
COUT
6
pF
The maximum capacitance values
include the full length of the pin pad.
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DATASHEET
TEST CONDITION
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 6 AC Specifications
6.1
Oscillator/Crystal
Parallel Resonant, Fundamental Mode, 24 MHz ±350 ppm.
XTALIN
(CS1 = CB1 + CXTALIN)
C1
Crystal
C0
CL
C2
XTALOUT
(CS2 = CB2 + CXTALOUT)
Figure 6.1 Typical Crystal Circuit
Table 6.1 Crystal Circuit Legend
SYMBOL
DESCRIPTION
IN ACCORDANCE WITH
C0
Crystal shunt capacitance
CL
Crystal load capacitance
CB
Total board or trace capacitance
OEM board design
CS
Stray capacitance
SMSC IC and OEM board design
CXTAL
XTAL pin input capacitance
SMSC IC
C1
Load capacitors installed on OEM
board
Calculated values based on Figure 6.2, "Formula to Find the
Value of C1 and C2" (See Note 6.2)
C2
Crystal manufacturer’s specification (See Note 6.1)
C1 = 2 x (CL – C0) – CS1
C2 = 2 x (CL – C0) – CS2
Figure 6.2 Formula to Find the Value of C1 and C2
Note 6.1
C0 is usually included (subtracted by the crystal manufacturer) in the specification for CL
and should be set to 0 for use in the calculation of the capacitance formulas in Figure 6.2,
"Formula to Find the Value of C1 and C2". However, the PCB itself may present a parasitic
capacitance between XTALIN and XTALOUT. For an accurate calculation of C1 and C2,
take the parasitic capacitance between traces XTALIN and XTALOUT into account.
Note 6.2
Each of these capacitance values is typically approximately 18 pF.
Revision 1.0 (06-04-13)
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DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
6.2
External Clock
50% Duty cycle ± 10%, 24 MHz ± 350 ppm.
The external clock is recommended to conform to the signaling level designated in the JESD76-2
specification on 1.2 V CMOS Logic. XTALOUT should be treated as a weak (< 1 mA) buffer output.
6.2.1
USB 2.0
The SMSC hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the USB 2.0 Specification [1]. See the USB Specification for more information.
6.3
SMBus Interface
The SMSC hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the SMBus 1.0 Specification [2] for slave-only devices (except as noted in Section 4.3,
"SMBus," on page 22).
SMSC USB2422
45
DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 7 Package Outline
Figure 7.1 24-SQFN Package
Table 7.1 24-SQFN Dimensions
A
A1
D/E
D2/E2
L
b
k
e
MIN
0.80
0
3.90
2.40
0.35
0.18
0.25
NOMINAL
0.90
0.02
4.00
2.50
0.40
0.25
0.35
0.50 BSC
MAX
1.00
0.05
4.10
2.60
0.45
0.30
-
REMARKS
Overall Package Height
Standoff
X/Y Body Size
X/Y Exposed Pad Size
Terminal Length
Terminal Width
Pin to Exposed Pad Clearance
Terminal Pitch
Notes:
1. All dimensions are in millimeters unless otherwise noted.
2. Dimension “b” applies to plated terminals and is measured between 0.15 and 0.30 mm from the terminal tip.
3. The pin 1 identifier may vary, but is always located within the zone indicated.
Revision 1.0 (06-04-13)
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DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Figure 7.2 Recommended PCB Land Pattern
Figure 7.3 Taping Dimensions and Part Orientation
SMSC USB2422
47
DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Figure 7.4 Reel Dimensions
Figure 7.5 Tape Length and Part Quantity
Note: Standard reel size is 4000 pieces per reel.
Revision 1.0 (06-04-13)
48
DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 8 Datasheet Revision History
Table 8.1 Customer Revision History
REVISION LEVEL & DATE
Rev. 1.0 (06-04-13)
SMSC USB2422
SECTION/FIGURE/ENTRY
CORRECTION
Initial Revision
49
DATASHEET
Revision 1.0 (06-04-13)
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Appendix A (Acronyms)
OCS: Over-Current Sense
PCB: Printed Circuit Board
PHY: Physical Layer
PLL: Phase-Locked Loop
SQFN: Sawn Quad Flat No Leads
RoHS: Restriction of Hazardous Substances Directive
SCL: Serial Clock
SIE: Serial Interface Engine
SMBus: System Management Bus
TT: Transaction Translator
Revision 1.0 (06-04-13)
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DATASHEET
SMSC USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Appendix B (References)
[1] Universal Serial Bus Specification, Version 2.0, April 27, 2000 (12/7/2000 and 5/28/2002 Errata)
USB Implementers Forum, Inc. http://www.usb.org
[2] System Management Bus Specification, version 1.0
SMBus. http://smbus.org/specs/
[3] JEDEC Specifications: JESD76-2 (June 2001) and J-STD-020D.1 (March 2008)
JEDEC Global Standards for the Microelectronics Industry.http://www.jedec.org/standards-documents
[4] USB Battery Charging Specification, Revision 1.1, April 15, 2009
USB Implementers Forum, Inc. http://www.usb.org
SMSC USB2422
51
DATASHEET
Revision 1.0 (06-04-13)