Smsc Usb2502 Users Manual 2 Port USB 2.0 Hub Controller Data Sheet
USB2502 to the manual f2dd32c8-f40f-405d-a730-8c379834c8df
2015-02-05
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USB2502
2-Port USB 2.0 Hub
Controller
PRODUCT FEATURES
Datasheet
Integrated USB 2.0 Compatible 2-Port Hub
—
High-Speed (480Mbits/s), Full-Speed (12Mbits/s) and
Low-Speed (1.5Mbits/s) compatible
— Full power management with ganged power control
— Detects Bus-Power/Self-Power source and changes
mode automatically
Complete USB Specification 2.0 Compatibility
VID/PID/DID, and Port Configuration for Hub via:
— Includes USB 2.0 Transceivers
Default VID/PID/DID, allows functionality when
configuration EEPROM is absent
Hardware Strapping options allow for configuration
without an external EEPROM or SMBus Host
SMSC USB2502
— Single Serial I2C EEPROM
— SMBus Slave Port
On-Board 24MHz Crystal Driver Circuit or 24 MHz
external clock driver
Internal PLL for 480MHz USB 2.0 Sampling
Internal 1.8V Linear Voltage Regulator
Integrated USB termination and Pull-up/Pull-down
resistors
Internal Short Circuit protection of USB differential
signal pins
Basic single-color LED support
1.8 Volt Low Power Core Operation
3.3 Volt I/O with 5V Input Tolerance
36 Pin QFN or 48 Pin TQFP lead-free RoHS
compliant package
DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
ORDER NUMBERS:
USB2502-AEZG FOR 36 PIN LEAD-FREE ROHS COMPLIANT QFN PACKAGE; USB2502-HT FOR 48 PIN LEADFREE ROHS COMPLIANT TQFP PACKAGE
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
Copyright © 2007 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.
SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Revision 2.3 (08-27-07)
2
DATASHEET
SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
Table of Contents
Chapter 1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1
OEM Selectable Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter 2 Pin Table 2-Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 3 Pin Configuration 2-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 4 2-Port Hub Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 5 Functional Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1
5.2
5.3
5.4
5.5
5.6
2-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1
Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.2
VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.1
I2C EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.2
In-Circuit EEPROM Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.3
EEPROM DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.1
Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.2
Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.3
General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.4
Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.5
Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.6
SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.7
Bus Reset Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.8
SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3.9
Internal SMBus Memory Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6.1
External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6.2
USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16
16
18
19
19
19
19
24
24
25
25
26
26
26
26
26
26
32
32
32
33
36
Chapter 6 XNOR Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Chapter 7 DC Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.1
7.2
Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Recommended Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Chapter 8 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8.1
Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.1
SMBus Interface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.2
I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.3
USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42
42
42
42
Chapter 9 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
SMSC USB2502
3
DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
List of Tables
Table 2.1
Table 2.2
Table 4.1
Table 4.2
Table 4.3
Table 4.4
Table 4.5
Table 5.1
Table 5.2
Table 5.3
Table 5.4
Table 5.5
Table 5.6
Table 5.7
Table 7.1
Table 9.1
2-Port Pin Table for 36-QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2-Port Pin Table for 48-TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2-Port Hub Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Miscellaneous Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power, Ground, and No Connect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
User-Defined Descriptor Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SMBus Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SMBus Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SMBus Slave Interface Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
48 Pin TQFP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Revision 2.3 (08-27-07)
4
DATASHEET
SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
List of Figures
Figure 3.1
Figure 3.2
Figure 4.1
Figure 5.1
Figure 5.2
Figure 5.3
Figure 5.4
Figure 9.1
Figure 9.2
2-Port 36-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2-Port 48-Pin TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2-Port Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LED Strapping Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
36 Pin QFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
48 Pin TQFP Package Outline (7x7x1.4 mm body, 2mm Footprint) . . . . . . . . . . . . . . . . . . . 44
SMSC USB2502
5
DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
Chapter 1 General Description
The SMSC 2-Port Hub is fully compliant with the USB 2.0 Specification and will attach to a USB host
as a Full-Speed Hub or as a Full-/High-Speed Hub. The 2-Port Hub supports Low-Speed, Full-Speed,
and High-Speed (if operating as a High-Speed Hub) downstream devices on all of the enabled
downstream ports.
The Hub works with an external USB power distribution switch device to control VBUS switching to
downstream ports, and to limit current and sense over-current conditions.
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.
Throughout this document the upstream facing port of the hub will be referred to as the upstream port,
and the downstream facing ports will be called the downstream ports.
1.1
OEM Selectable Features
A default configuration is available in the USB2502 following a reset. This configuration may be
sufficient for some applications. Strapping option pins make it possible to modify a limited sub-set of
the configuration options.
The USB2502 may also be configured by an external EEPROM or a microcontroller. When using the
microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pin-strapped for
external EEPROM configuration but no external EEPROM is present, then a value of ‘0’ will be written
to all configuration data bit fields (the hub will attach to the host with all ‘0’ values).
The 2-Port Hub supports several OEM selectable features:
Operation as a Self-Powered USB Hub or as a Bus-Powered USB Hub.
Operation as a Dynamic-Powered Hub (Hub operates as a Bus-Powered device if a local power
source is not available and switches to Self-Powered operation when a local power source is
available).
Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from
an external SMBus Host.
Compound device support (port is permanently hardwired to a downstream USB peripheral device).
Hardware strapping options enable configuration of the following features.
Non-Removable Ports
Port Power Polarity (active high or active low logic)
Revision 2.3 (08-27-07)
6
DATASHEET
SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
Chapter 2 Pin Table 2-Port
Table 2.1 2-Port Pin Table for 36-QFN
UPSTREAM USB 2.0 INTERFACE (3 PINS)
USBDP0
USBDN0
VBUS_DET
2-PORT USB 2.0 INTERFACE (10 PINS)
USBDP1
USBDN1
USBDP2
USBDN2
GR1/
NON_REM0
GR2/
NON_REM1
PRTPWR_POL
RBIAS
PRTPWR
OCS_N
SERIAL PORT INTERFACE (3 PINS)
SDA/SMBDATA
SCL/SMBCLK/
CFG_SEL0
CFG_SEL1
MISC (7 PINS)
XTAL1/CLKIN
XTAL2
RESET_N
ATEST/
REG_EN
CLKIN_EN
TEST
SELF_PWR
POWER, GROUND (13 PINS)
SMSC USB2502
7
DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
Table 2.2 2-Port Pin Table for 48-TQFP
UPSTREAM USB 2.0 INTERFACE (3 PINS)
USBDP0
USBDN0
VBUS_DET
2-PORT USB 2.0 INTERFACE (10 PINS)
USBDP1
USBDN1
USBDP2
USBDN2
GR1/
NON_REM0
GR2/
NON_REM1
PRTPWR_POL
RBIAS
PRTPWR
OCS_N
SERIAL PORT INTERFACE (3 PINS)
SDA/SMBDATA
SCL/SMBCLK
CFG_SEL0
CFG_SEL1
MISC (7 PINS)
XTAL1/CLKIN
XTAL2
RESET_N
ATEST/
REG_EN
CLKIN_EN
TEST
SELF_PWR
POWER, GROUND AND NO CONNECT (25 PINS)
Revision 2.3 (08-27-07)
8
DATASHEET
SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
VDD18
VSS
VBUS_DET
RESET_N
TEST
CLKIN_EN
CFG_SEL1
SCL/SMBCLK/CFG_SEL0
SDA/SMBDATA
27
26
25
24
23
22
21
20
19
Chapter 3 Pin Configuration 2-Port Hub
VDD33CR
28
18
VDD18
VSS
29
17
VSS
XTAL2
30
16
SELF_PWR
XTAL1/CLKIN
31
15
OCS_N
VDDA18PLL
32
14
PRTPWR
VDDA33PLL
33
13
PRTPWR_POL
ATEST/REG_EN
34
12
GR2/NON_REM1
11
GR1/NON_REM0
10
VSS
2
3
4
5
6
7
8
9
USBDN0
VSS
USBDN1
USBDP1
VDDA33
USBDP2
USBDN2
36
USBDP0
VSS
1
35
Thermal Slug
(must be connected to VSS)
VDDA33
RBIAS
SMSC
USB2502
(Top View QFN-36)
Indicates pins on the bottom of the device.
Figure 3.1 2-Port 36-Pin QFN
SMSC USB2502
9
DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
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Figure 3.2 2-Port 48-Pin TQFP
Revision 2.3 (08-27-07)
10
DATASHEET
SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
Chapter 4 2-Port Hub Block Diagram
Upstream
USB Data
8SVWUHDP
VBUS
24 MHz
Crystal
To EEPROM or
SMBus Master
PLL
Bus-Power
'HWHFW
SD
1.8V
3.3V
Upstream
PHY
1.8V Reg
Repeater
SIE
SCK
Serial
Interface
Controller
Port
Controller
Transaction Translator
Routing Logic
OC Sense
Switch Driver
LED Driver
Strapping Options
Downstream PHY #1
Downstream
USB Data
OC
Sense
Switch/LED
Driver/optís
Downstream PHY #2
Downstream
USB Data
Figure 4.1 2-Port Block Diagram
Table 4.1 2-Port Hub Pin Descriptions
NAME
SYMBOL
TYPE
FUNCTION
UPSTREAM USB 2.0 INTERFACE
USB Bus Data
USBDN0
USBDP0
IO-U
These pins connect to the upstream USB bus data signals.
Detect Upstream
VBUS Power
VBUS_DET
I/O8
Detects 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 must be
connected to the VBUS power pin of the USB port that is
upstream of the hub. (Use of a weak pull-down resistor is
recommended.)
For self-powered applications with a permanently attached
host, this pin must be pulled-up to either 3.3V or 5.0V
(typically VDD33).
SMSC USB2502
11
DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
Table 4.1 2-Port Hub Pin Descriptions (continued)
NAME
SYMBOL
TYPE
FUNCTION
2-PORT USB 2.0 HUB INTERFACE
High-Speed USB
Data
USBDN[2:1]
USBDP[2:1]
IO-U
USB Power
Enable
PRTPWR
O8
Port [2:1] Green
LED
&
Port NonRemovable
strapping option.
GR[2:1]/
NON_REM[1:0]
These pins connect to the downstream USB peripheral
devices attached to the Hub’s ports.
Enables power to USB peripheral devices (downstream).
The active signal level of the PRTPWR pin is determined by
the Power Polarity Strapping function of the PRTPWR_POL
pin.
I/O8
Green indicator LED for ports 2 and 1. Will be active low
when LED support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
these pins will be sampled at the rising edge of RESET_N
(see the applicable RESET_N timing table in Section 5.6.1)
to determine if ports [2:1] contain permanently attached
(non-removable) devices. Also, the active state of the LED’s
will be determined as follows:
NON_REM[1:0] = ‘00’, All ports are removable,
GR2 is active high,
GR1 is active high.
NON_REM1:0] = ‘01’, Port 1 is non-removable,
GR2 is active high,
GR1 is active low.
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,
GR2 is active low,
GR1 is active high.
NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable,
GR2 is active low,
GR1 is active low.
Port Power
Polarity strapping.
PRTPWR_POL
I/O8
Port Power Polarity strapping determination for the active
signal polarity of the PRTPWR pin.
While RESET_N is asserted, the logic state of this pin will
(though the use of internal combinatorial logic) determine
the active state of the PRTPWR pin in order to ensure that
downstream port power is not inadvertently enabled to
inactive ports during a hardware reset.
On the rising edge of RESET_N (see the applicable
RESET_N timing table in Section 5.6.1), the logic value will
be latched internally, and will retain the active signal polarity
for the PRTPWR pin.
‘1’ = PRTPWR pin has an active ‘high’ polarity
‘0’ = PRTPWR pin has an active ‘low’ polarity
Over Current
Sense
OCS_N
IPU
Input from external current monitor indicating an overcurrent condition. {Note: Contains internal pull-up to 3.3V
supply}
USB Transceiver
Bias
RBIAS
I-R
A 12.0kΩ (+/− 1%) resistor is attached from ground to this
pin to set the transceiver’s internal bias settings.
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2-Port USB 2.0 Hub Controller
Datasheet
Table 4.1 2-Port Hub Pin Descriptions (continued)
NAME
SYMBOL
TYPE
FUNCTION
SERIAL PORT INTERFACE
Serial Data/SMB
Data
SDA/SMBDATA
IOSD12
(Serial Data)/(SMB Data) signal.
Serial Clock/SMB
Clock
&
Config Select 0
SCL/SMBCLK/
CFG_SEL0
IOSD12
(Serial Clock)/(SMB Clock) signal. This multifunction pin is
read on the rising edge of RESET_N (see the applicable
RESET_N timing table in Section 5.6.1) and will determine
the hub configuration method as described in Table 4.2.
Configuration
Programming
Select
CFG_SEL1
I
This pin is read on the rising edge of RESET_N (see the
applicable RESET_N timing table in Section 5.6.1) and will
determine the hub configuration method as described in
Table 4.2.
Table 4.2 SMBus or EEPROM Interface Behavior
CFG_SEL1
CFG_SEL0
SMBus or EEPROM interface behavior.
0
0
Reserved
0
1
Configured as an SMBus slave for external download of userdefined descriptors. SMBus slave address is 0101100
1
0
Internal Default Configuration via strapping options.
1
1
2-wire (I2C) EEPROMS are supported,
Table 4.3 Miscellaneous Pins
NAME
SYMBOL
TYPE
FUNCTION
Crystal
Input/External
Clock Input
XTAL1/
CLKIN
ICLKx
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.
Crystal Output
XTAL2
OCLKx
24MHz Crystal
This is the other terminal of the crystal, or left
unconnected when an external clock source is used to
drive XTAL1/CLKIN. It must not be used to drive any
external circuitry other than the crystal circuit.
Clock Input
Enable
CLKIN_EN
I
Clock In Enable:
Low = XTAL1 and XTAL2 pins configured for use with
external crystal
High = XTAL1 pin configured as CLKIN, and must be
driven by an external CMOS clock.
RESET Input
RESET_N
IS
This active low signal is used by the system to reset the
chip. The minimum active low pulse is 1us.
Self-Power /
Bus-Power
Detect
SELF_PWR
I
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.
TEST Pin
TEST
IPD
SMSC USB2502
Used for testing the chip. User must treat as a noconnect or connect to ground.
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Datasheet
Table 4.3 Miscellaneous Pins (continued)
NAME
SYMBOL
TYPE
FUNCTION
Analog Test
&
Internal 1.8V
voltage
regulator
enable
ATEST/
REG_EN
AIO
This signal is used for testing the analog section of the
chip, and to enable or disable the internal 1.8v regulator.
This pin must be connected to VDDA33 to enable the
internal 1.8V regulator, or to VSS to disable the internal
regulator.
When the internal regulator is enabled, the 1.8V power
pins must be left unconnected, except for the required
bypass capacitors.When the PHY is in test mode, the
internal regulator is disabled and the ATEST pin
functions as a test pin.
Table 4.4 Power, Ground, and No Connect
NAME
SYMBOL
VDDCORE3P3
VDD33CR
TYPE
FUNCTION
+3.3V I/O Power.
If the internal core 1.8V regulator is enabled, then this pin
acts as the regulator input
VDD1P8
VDD18
+1.8V core power.
If the internal regulator is enabled, then VDD18 pin 27
must have a 4.7μF (or greater) ±20% (ESR <0.1Ω)
capacitor to VSS
VDDAPLL3P3
VDDA33PLL
+3.3V Filtered analog power for the internal PLL
If the internal PLL 1.8V regulator is enabled, then this pin
acts as the regulator input
VDDAPLL1P8
VDDA18PLL
+1.8V Filtered analog power for internal PLL.
If the internal regulator is enabled, then this pin must
have a 4.7μF (or greater) ±20% (ESR <0.1Ω) capacitor
to VSS
VDDA3P3
VDDA33
VSS
VSS
+3.3V Filtered analog power.
Ground.
Table 4.5 Buffer Type Descriptions
BUFFER
I
DESCRIPTION
Input.
IPD
Input, with a weak Internal pull-down.
IPU
Input, with a weak Internal pull-up.
IS
Input with Schmitt trigger.
I/O8
Input/Output 8mA
O8
Output 8mA
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2-Port USB 2.0 Hub Controller
Datasheet
Table 4.5 Buffer Type Descriptions (continued)
BUFFER
DESCRIPTION
IOSD12
Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus Specification Version 2.1
requirements.
ICLKx
XTAL Clock Input
OCLKx
XTAL Clock Output
I-R
RBIAS
IO-U
Defined in USB Specification.
Note: Meets USB 1.1 requirements when operating as a 1.1-compliant device and meets USB
2.0 requirements when operating as a 2.0-compliant device.
AIO
Analog Input/output. Per PHY test requirements.
SMSC USB2502
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2-Port USB 2.0 Hub Controller
Datasheet
Chapter 5 Functional Block Description
5.1
2-Port Hub
SMSC’s USB 2.0 2-Port Hub is fully specification compliant to the Universal Serial Bus Specification
Revision 2.0 April 27,2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 11 (Hub
Specification) for general details regarding Hub operation and functionality.
For performance reasons, the 2-Port Hub provides 1 Transaction Translator (TT) per port (defined as
Multi-TT configuration), divided into 4 non-periodic buffers per TT.
5.1.1
Hub Configuration Options
The SMSC Hub supports a large number of features and must be configured in order to correctly
function when attached to a USB host controller. There are three principal ways to configure the hub:
SMBus, EEPROM, or by internal default settings. In all cases, the configuration method will be
determined by the CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.
5.1.1.1
Vendor ID
Is a 16-bit value that uniquely identifies the Vendor of the user device (assigned by USB-Interface
Forum). This field is set by the OEM using either the SMBus or EEPROM interface options. When
using the internal default option, SMSC’s VID (see Table 5.1) will be reported.
5.1.1.2
Product ID
Is a 16-bit value that the Vendor can assign that uniquely identifies this particular product (assigned
by OEM). This field is set by the OEM using either the SMBus or EEPROM interface options. When
using the internal default option, SMSC’s PID designation of (see Table 5.1) will be reported.
5.1.1.3
Device ID
Is a 16-bit device release number in BCD format (assigned by OEM). This field is set by the OEM
using either the SMBus or EEPROM interface options. When using the internal default option, SMSC’s
DID designation of (see Table 5.1) will be reported.
5.1.1.4
Self-Powered/Bus-Powered
The Hub is either Self-Powered (draws less than 2mA of upstream bus power) or Bus-Powered
(limited to a 100mA maximum of upstream power prior to being configured by the host controller).
When configured as a Bus-Powered device, the SMSC Hub consumes less than 100mA of current
prior to being configured. After configuration, the Bus-Powered SMSC Hub (along with all associated
hub circuitry, any embedded devices if part of a compound device, and 100mA per externally available
downstream port) must consume no more than 500mA of upstream VBUS current. The current
consumption is system dependent, and the OEM must ensure that the USB 2.0 specifications are not
violated.
When configured as a Self-Powered device, <1mA of upstream VBUS current is consumed and all 7
ports are available, with each port being capable of sourcing 500mA of current.
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the SELF_PWR pin determines the Self-powered or Bus-powered status.
Please see the description under Dynamic Power for the self/bus power functionality when dynamic
power switching is enabled.
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2-Port USB 2.0 Hub Controller
Datasheet
5.1.1.5
High-Speed Disable
Allows an OEM to force the Hub to configure as a Full-Speed device only (i.e. High-Speed not
available).
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.6
EOP Disable
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.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.7
Current Sensing
Selects current sensing as all ports ganged, or none.
This field can be set by the OEM using either the SMBus or EEPROM interface options.When using
the internal default option, the SELF_PWR pin determines if current sensing will be ganged, or none
(ganged if self-powered, none if bus-powered)
5.1.1.8
Compound Device
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”.
This field is set by the OEM using either the SMBus or EEPROM interface options.
Note: When configured via strapping options, declaring a port as non-removable automatically causes
the hub controller to report that it is part of a compound device.
5.1.1.9
Non-Removable Device
Informs the Host if one of the active ports has a permanent device that is undetachable from the Hub.
(Note: The device must provide its own descriptor data.)
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the NON_REM[1:0] pins will designate the appropriate ports as being nonremovable.
5.1.1.10
Self-Powered Port DISABLE
During Self-Powered operation, this selects the ports which will be permanently disabled, and are not
available to be enabled or enumerated by a Host Controller. The disabled ports must be in decreasing
order starting with port 2.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.11
Bus-Powered Port DISABLE
During Bus-Powered operation, this selects the ports which will be permanently disabled, and are not
available to be enabled or enumerated by a Host Controller. The disabled ports must be in decreasing
order starting with port 2.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.12
Dynamic Power
Controls the ability of the 2-Port Hub to automatically change from Self-Powered operation to BusPowered operation if the local power source is removed or is unavailable (and from Bus-Powered to
Self-Powered if the local power source is restored). {Note: If the local power source is available, the
2-port Hub will always switch to Self-Powered operation.}
SMSC USB2502
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Datasheet
When Dynamic Power switching is enabled, the Hub detects the availability of a local power source
by monitoring the external SELF_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 in unavailable) or a Self-Powered Hub (if local power is available).
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.13
Over-Current Timer
The time delay (in 2ms increments) for an over-current condition to persist before it is reported to the
Host.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.14
Self-Powered Max Power
When in Self-Powered configuration, Sets value in 2mA increments.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.15
Bus-Powered Max Power
When in Bus-Powered configuration, Sets value in 2mA increments.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.16
Self-powered Hub Controller Current
When in Self-Powered configuration, Maximum current requirements of the Hub Controller in 2mA
increments.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.17
Bus-Powered Hub Controller Current
When in Bus-Powered configuration, Maximum current requirements of the Hub Controller in 2mA
increments.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.18
Power-On Timer
Time (in 2ms intervals) from the time 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.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.19
Power Switching Polarity
The selection of active state “polarity” for the PRTPWR2 pin is made by a strapping option only.
5.1.2
VBus Detect
According to Section 7.2.1 of the USB 2.0 Specification, a downstream port can never provide power
to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.
The VBUS_DET pin on the Hub monitors the state of the upstream VBUS signal and will not pull-up
the D+ or D- resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not
Powered), Hub will remove power from the D+ or D- pull-up resistor within 10 seconds.
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2-Port USB 2.0 Hub Controller
Datasheet
5.2
EEPROM Interface
The SMSC Hub can be configured via a 2-wire (I2C) EEPROM. (Please see Table 4.1, "7-Port Hub
Pin Descriptions" for specific details on how to enable the I2C EEPROM option).
The Internal state-machine will, (when configured for EEPROM support) read the external EEPROM
for configuration data. The hub will then “attach” to the upstream USB host.
Please see Table 5.1 User-Defined Descriptor Data for a list of data fields available.
5.2.1
I2C EEPROM
The I2C EEPROM interface implements a subset of the I2C Master Specification (Please refer to the
Philips Semiconductor Standard I2C-Bus Specification for details on I2C bus protocols). The Hub’s I2C
EEPROM interface is designed to attach to a single “dedicated” I2C EEPROM, and it conforms to the
Standard-mode I2C Specification (100kbit/s transfer rate and 7-bit addressing) for protocol and
electrical compatibility.
Note: Extensions to the I2C Specification are not supported.
The Hub acts as the master and generates the serial clock SCL, controls the bus access (determines
which device acts as the transmitter and which device acts as the receiver), and generates the START
and STOP conditions.
5.2.1.1
Implementation Characteristics
Please refer to the MicroChip 24AA00 DataSheet for Protocol and Programming specifics.
5.2.1.2
Pull-Up Resistor
The Circuit board designer is required to place external pull-up resistors (10KΩ recommended) on the
SDA/SMBDATA & SCL/SMBCLK/CFG_SELO lines (per SMBus 1.0 Specification, and EEPROM
manufacturer guidelines) to Vcc in order to assure proper operation.
5.2.1.3
I2C EEPROM Slave Address
Slave address is 1010000.
Note: 10-bit addressing is NOT supported.
5.2.2
In-Circuit EEPROM Programming
The EEPROM can be programmed via ATE by pulling RESET_N low (which tri-states the Hub’s
EEPROM interface and allows an external source to program the EEPROM).
5.2.3
EEPROM DATA
Table 5.1 User-Defined Descriptor Data
DEFAULT
CFG
SELF
(HEX)
DEFAULT
CFG
BUS
(HEX)
2
0424
0424
Vendor ID (assigned by USB-IF).
3:2
2
2502
2502
Product ID (assigned by Manufacturer).
5:4
2
0000
0000
Device ID (assigned by Manufacturer).
BYTE
MSB:
LSB
SIZE
(BYTES)
VID
1:0
PID
DID
FIELD
SMSC USB2502
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DESCRIPTION
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
Table 5.1 User-Defined Descriptor Data (continued)
DEFAULT
CFG
SELF
(HEX)
DEFAULT
CFG
BUS
(HEX)
1
88
0C
Configuration data byte #1 for Hub options.
7
1
90
90
Configuration data byte #2 for Hub options.
Non
Removable
Device
8
1
00
00
Defines the ports that contain attached
devices (this is used only when Hub is part of
a compound device).
Port Disable
Self-Powered
9
1
00
00
Selects the ports that will be permanently
disabled
Port Disable
Bus-Powered
A
1
00
00
Selects the ports that will be permanently
disabled
Max Power
Self-Powered
B
1
01
01
Max Current for this configuration (expressed
in 2mA units).
Max Power
Bus-Powered
C
1
64
64
Max Current for this configuration (expressed
in 2mA units).
Hub Controller
Max Current
Self-Powered
D
1
01
01
Max Current (expressed in 2mA units).
Hub Controller
Max Current
Bus-Powered
E
1
64
64
Max Current (expressed in 2mA units).
Power-On
Time
F
1
32
32
Time until power is stable.
BYTE
MSB:
LSB
SIZE
(BYTES)
Config Data
Byte 1
6
Config Data
Byte 2
FIELD
5.2.3.1
DESCRIPTION
EEPROM Offset 1:0(h) - Vendor ID
BIT
NUMBER
BIT NAME
15:8
VID_MSB
Most Significant Byte of the Vendor ID.
7:0
VID_LSB
Least Significant Byte of the Vendor ID.
5.2.3.2
DESCRIPTION
EEPROM Offset 3:2(h) - Product ID
BIT
NUMBER
BIT NAME
15:8
PID_MSB
Most Significant Byte of the Product ID.
7:0
PID_LSB
Least Significant Byte of the Product ID.
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DESCRIPTION
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2-Port USB 2.0 Hub Controller
Datasheet
5.2.3.3
EEPROM Offset 5:4(h) - Device ID
BIT
NUMBER
BIT NAME
15:8
DID_MSB
Most Significant Byte of the Device ID.
7:0
DID_LSB
Least Significant Byte of the Device ID.
5.2.3.4
DESCRIPTION
EEPROM Offset 6(h) - CONFIG_BYTE_1
BIT
NUMBER
BIT NAME
7
SELF_BUS_PWR
DESCRIPTION
Self or Bus Power: Selects between Self- and Bus-Powered operation.
0 = Bus-Powered operation. (BUS Default)
1 = Self-Powered operation. (SELF Default)
Note: If Dynamic Power Switching is enabled, this bit is ignored and the
SELF_PWR pin is used to determine if the hub is operating from self or bus
power.
6
Reserved
5
HS_DISABLE
Reserved
High Speed Disable: Disables the capability to attach as either a High/Fullspeed device, and forces attachment as Full-speed only i.e. (no High-Speed
support).
0 = High-/Full-Speed. (Default)
1 = Full-Speed-Only (High-Speed disabled!)
4
Reserved
3
EOP_DISABLE
Reserved
EOP Disable: Disables EOP generation at EOF1 when no downstream
directed traffic is in progress.
0 = EOP generation at EOF1 is enabled.
1 = EOP generation at EOF1 is disabled, (normal operation). (Default)
2:1
CURRENT_SNS
Over Current Sense: Indicates whether current sensing is ganged.
00 = Ganged sensing (all ports together). (Default for self-power)
01 = Reserved
1x = Over current sensing not supported. (may be used with Bus-Powered
configurations only!, and is the default for bus-power)
0
5.2.3.5
Reserved
Reserved
EEPROM Offset 7(h) - CONFIG_BYTE_2
BIT
NUMBER
BIT NAME
DESCRIPTION
7
DYNAMIC
Dynamic Power Enable: Controls the ability for the Hub to transition to BusPowered operation if the local power source is removed (can revert back to
Self-Power if local power source is restored).
0 = No Dynamic auto-switching.
1 = Dynamic Auto-switching capable.(Default)
6
SMSC USB2502
Reserved
Reserved
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2-Port USB 2.0 Hub Controller
Datasheet
BIT
NUMBER
BIT NAME
DESCRIPTION
5:4
OC_TIMER
OverCurrent Timer: Over Current Timer delay.
00 = 0.1ms
01 = 2ms (Default)
10 = 4ms
11 = 6ms
3
COMPOUND
Compound Device: Designates if Hub is part of a compound device.
0 = No. (Default)
1 = Yes, Hub is part of a compound device.
2:0
5.2.3.6
Reserved
Reserved.
EEPROM Offset 8(h) - Non-Removable Device
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
NR_DEVICE
Non-Removable Device: Indicates which port(s) include non-removable devices. ‘0’ = port is removable, ‘1’ = port is non-removable.
Bit 7:3= 0; Reserved
Bit 2= 1; Port 2 non-removable.
Bit 1= 1; Port 1 non removable.
Bit 0 is Reserved, always = ‘0’.
5.2.3.7
EEPROM Offset 9(h) - Port Disable For Self Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PORT_DIS_SP
Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
Bit 7:3= 0; Reserved
Bit 2= 1; Port 2 is disabled.
Bit 1= 1; Port 1 is disabled.
Bit 0 is Reserved, always = ‘0’
5.2.3.8
EEPROM Offset A(h) - Port Disable For Bus Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PORT_DIS_BP
Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
Bit 7:3= 0; Reserved
Bit 2= 1; Port 2 is disabled.
Bit 1= 1; Port 1 is disabled.
Bit 0 is Reserved, always = ‘0’
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2-Port USB 2.0 Hub Controller
Datasheet
5.2.3.9
EEPROM Offset B(h) - Max Power For Self Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
MAX_PWR_SP
Max Power Self_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA.
5.2.3.10
EEPROM Offset C(h) - Max Power For Bus Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
MAX_PWR_BP
Max Power Bus_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
A value of 50 (decimal) indicates 100mA.
5.2.3.11
EEPROM Offset D(h) - Hub Controller Max Current For Self Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
HC_MAX_C_SP
Hub Controller Max Current Self-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a selfpowered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA, which is the default value.
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Datasheet
5.2.3.12
EEPROM Offset E(h) - Hub Controller Max Current For Bus Powered Operation
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
HC_MAX_C_BP
Hub Controller Max Current Bus-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a selfpowered 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.
A value of 50 (decimal) indicates 100mA, which is the default value.
5.2.3.13
EEPROM Offset F(h) - Power-On Time
BIT
NUMBER
BIT NAME
DESCRIPTION
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.
5.3
SMBus Slave Interface
Instead of loading User-Defined Descriptor data from an external EEPROM, the SMSC Hub can be
configured to receive a code load from an external processor via an SMBus interface. The SMBus
interface shares the same pins as the EEPROM interface, if CFG_SEL1 & CFG_SEL0 activates the
SMBus interface, external EEPROM support is no longer available (and the user-defined descriptor
data must be downloaded via the SMBus). Due to system issues, 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 implementation is a subset of the SMBus interface to the host. The device is a
slave-only SMBus device. The implementation in the device is a subset of SMBus since it only supports
two protocols.
The Write Byte and Read Byte protocols are the only valid SMBus protocols for the Hub. The Hub
responds to other protocols as described in Section 5.3.2, "Invalid Protocol Response Behavior," on
page 25. Reference the System Management Bus Specification, Rev 1.0.
The SMBus interface is used to read and write the registers in the device. The register set is shown
in Section 5.3.9, "Internal SMBus Memory Register Set," on page 26.
5.3.1
Bus Protocols
Typical Write Byte and Read Byte protocols are shown below. Register accesses are performed using
7-bit slave addressing, an 8-bit register address field, and an 8-bit data field. The shading indicates
the Hub driving data on the SMBDATA line; otherwise, host data is on the SDA/SMBDATA line.
The slave address is the unique SMBus Interface Address for the Hub that identifies it on 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 (msb first).
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SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
5.3.1.1
Byte Protocols
When using the Hub SMBus Interface for byte transfers, a write will always consist of the SMBus
Interface Slave Address byte, followed by the Internal Address Register byte, then the data byte.
The normal read protocol consists of a write to the HUB with the SMBus Interface Address byte,
followed by the Internal Address Register byte. Then restart the Serial Communication with a Read
consisting of the SMBus Interface Address byte, followed by the data byte read from the Hub. This
can be accomplished by using the Read Byte protocol.
Note: For the following SMBus tables:
Denotes Master-to-Slave
Denotes Slave-to-Master
Write Byte
The Write Byte protocol is used to write data to the registers. The data will only be written if the protocol
shown in Table 5.2 is performed correctly. Only one byte is transferred at a time for a Write Byte
protocol.
Table 5.2 SMBus Write Byte Protocol
Field:
Start
Bits:
Slave Addr
1
7
Wr
Ack
1
1
Reg. Addr
Ack
8
Reg. Data
1
8
Ack
Stop
1
1
Read Byte
The Read Byte protocol is used to read data from the registers. The data will only be read if the
protocol shown in Table 5.3 is performed correctly. Only one byte is transferred at a time for a Read
Byte protocol.
Table 5.3 SMBus Read Byte Protocol
Field:
Start
Slave
Addr
Wr
Ack
Bits:
1
7
1
1
5.3.2
Reg.
Addr
8
Ack
Start
Slave
Addr
Rd
Ack
Reg.
Data
Nack
Stop
1
1
7
1
1
8
1
1
Invalid Protocol Response Behavior
Registers that are accessed with an invalid protocol are not updated. A register is only updated
following a valid protocol. The only valid protocols are Write Byte and Read Byte, which are described
above.
The Hub only responds to the hardware selected Slave Address.
Attempting to communicate with the Hub over SMBus with an invalid slave address or invalid protocol
results in no response, and the SMBus Slave Interface returns to the idle state.
The only valid registers that are accessible by the SMBus slave address are the registers defined in
the Registers Section. See Section 5.3.3 for the response to undefined registers.
5.3.3
General Call Address Response
The Hub does not respond to a general call address of 0000_000b.
SMSC USB2502
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Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
5.3.4
Slave Device Time-Out
According to the SMBus Specification, V1.0 devices in a transfer can abort the transfer in progress
and release the bus when any single clock low interval exceeds 25ms (TTIMEOUT, MIN). Devices that
have detected this condition must reset their communication and be able to receive a new START
condition no later than 35ms (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.
5.3.5
Stretching the SCLK Signal
The Hub supports stretching of the SCLK by other devices on the SMBus. The Hub does not stretch
the SCLK.
5.3.6
SMBus Timing
The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing
in the “Timing Diagram” section.
5.3.7
Bus Reset Sequence
The SMBus Slave Interface resets and returns to the idle state upon a START field followed
immediately by a STOP field.
5.3.8
SMBus Alert Response Address
The SMBALERT# signal is not supported by the Hub.
5.3.9
Internal SMBus Memory Register Set
The following table provides the SMBus slave interface register map values.
Table 5.4 SMBus Slave Interface Register Map
REG
ADDR
R/W
ABBR
BIT 7
(MSB)
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
(LSB)
00h
R/W
Status/Command
STCD
7
6
5
4
3
2
1
0
01h
R/W
VID LSB
VIDL
7
6
5
4
3
2
1
0
02h
R/W
VID MSB
VIDM
7
6
5
4
3
2
1
0
03h
R/W
PID LSB
PIDL
7
6
5
4
3
2
1
0
04h
R/W
PID MSB
PIDM
7
6
5
4
3
2
1
0
05h
R/W
DID LSB
DIDL
7
6
5
4
3
2
1
0
06h
R/W
DID MSB
DIDM
7
6
5
4
3
2
1
0
07h
R/W
Config Data Byte 1
CFG1
7
6
5
4
3
2
1
0
08h
R/W
Config Data Byte 2
CFG2
7
6
5
4
3
2
1
0
09h
R/W
Non-Removable
Devices
NRD
7
6
5
4
3
2
1
0
0Ah
R/W
Port Disable (Self)
PDS
7
6
5
4
3
2
1
0
0Bh
R/W
Port Disable (Bus)
PDB
7
6
5
4
3
2
1
0
REGISTER NAME
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SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
Table 5.4 SMBus Slave Interface Register Map (continued)
REG
ADDR
R/W
REGISTER NAME
ABBR
BIT 7
(MSB)
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
(LSB)
0Ch
R/W
Max Power (Self)
MAXPS
7
6
5
4
3
2
1
0
0Dh
R/W
Max Power (Bus)
MAXPB
7
6
5
4
3
2
1
0
0Eh
R/W
Hub Controller
Max Current (Self)
HCMCS
7
6
5
4
3
2
1
0
0Fh
R/W
Hub Controller
Max Current (bus)
HCMCB
7
6
5
4
3
2
1
0
10h
R/W
Power-on Time
PWRT
7
6
5
4
3
2
1
0
5.3.9.1
Register 00h: Status/Command (Reset = 0x00)
BIT
NUMBER
BIT NAME
7:3
Reserved
2
RESET
DESCRIPTION
Reserved. {Note: Software must never write a ‘1’ to these bits}
Reset the SMBus Interface and internal memory back to RESET_N assertion
default settings. {Note: During this reset, this bit is automatically cleared to
its default value of 0.}
0 = Normal Run/Idle State.
1 = Force a reset.
1
WRITE_PROT
Write Protect: The external SMBus host sets this bit after the Hub’s internal
memory is loaded with configuration data. {Note: The External SMBus Host
is responsible for verification of downloaded data.}
0 = The internal memory (address range 01-10h) is not write protected.
1 = The internal memory (address range 01-10h) is “write-protected” to
prevent unintentional data corruption.}
{Note: This bit is write once and is only cleared by assertion of the external
RESET_N pin.}
0
USB_ATTACH
USB Attach & power-down the SMBus Interface.
0 = Default; SMBus slave interface is active.
1 = Hub will signal a USB attach event to an upstream device, Note: SMBus
Slave interface will completely power down after the ACK has completed.
{Note: This bit is write once and is only cleared by assertion of the external
RESET_N pin.}
5.3.9.2
Register 01h: Vendor ID (LSB) (Reset = 0x00)
BIT
NUMBER
BIT NAME
7:0
VID_LSB
SMSC USB2502
DESCRIPTION
Least Significant Byte of the Vendor ID.
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Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
5.3.9.3
Register 02h: Vendor ID (MSB) (Reset = 0x00)
BIT
NUMBER
BIT NAME
7:0
VID_MSB
5.3.9.4
BIT NAME
7:0
PID_LSB
BIT NAME
7:0
PID_MSB
BIT NAME
7:0
DID_LSB
DESCRIPTION
Most Significant Byte of the Product ID.
DESCRIPTION
Least Significant Byte of the Device ID.
Register 06h: Device ID (MSB) (Reset = 0x00)
BIT
NUMBER
BIT NAME
7:0
DID_MSB
5.3.9.8
Least Significant Byte of the Product ID.
Register 05h: Device ID (LSB) (Reset = 0x00)
BIT
NUMBER
5.3.9.7
DESCRIPTION
Register 04h: Product ID (MSB) (Reset = 0x00)
BIT
NUMBER
5.3.9.6
Most Significant Byte of the Vendor ID.
Register 03h: Product ID (LSB) (Reset = 0x00)
BIT
NUMBER
5.3.9.5
DESCRIPTION
DESCRIPTION
Most Significant Byte of the Device ID.
Register 07h: CONFIG_BYTE_1 (Reset = 0x00)
BIT
NUMBER
BIT NAME
7
SELF_BUS_PWR
DESCRIPTION
Self or Bus Power: Selects between Self- and Bus-Powered operation.
0 = Bus-Powered operation.
1 = Self-Powered operation.
Note: If Dynamic Power Switching is enabled, this bit is ignored and the
SELF_PWR pin is used to determine if the hub is operating from self or bus
power.
6
Reserved
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Reserved
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2-Port USB 2.0 Hub Controller
Datasheet
BIT
NUMBER
BIT NAME
DESCRIPTION
5
HS_DISABLE
High Speed Disable: Disables the capability to attach as either a High/Fullspeed 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
Reserved
3
EOP_DISABLE
Reserved
EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.
0 = EOP generation is normal.
1 = EOP generation is disabled.
2:1
CURRENT_SNS
Over Current Sense: Indicates whether current sensing isganged.
00 = Ganged sensing (all ports together).
01 = Reserved1x = Over current sensing not supported. (must only be used
with Bus-Powered configurations!)
0
5.3.9.9
Reserved
Reserved
Register 08h: Configuration Data Byte 2 (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7
DYNAMIC
Dynamic Power Enable: Controls the ability for the Hub to transition to BusPowered operation if the local power source is removed (can revert back to
Self-Power if local power source is restored).
0 = No Dynamic auto-switching.
1 = Dynamic Auto-switching capable.
6
Reserved
5:4
OC_TIMER
Reserved
OverCurrent Timer: Over Current Timer delay.
00 = 0.1ms
01 = 2ms
10 = 4ms
11 = 6ms
3
COMPOUND
Compound Device: Designates if Hub is part of a compound device.
0 = No.
1 = Yes, Hub is part of a compound device.
2:0
SMSC USB2502
Reserved
Reserved
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2-Port USB 2.0 Hub Controller
Datasheet
5.3.9.10
Register 09h: Non-Removable Device (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
NR_DEVICE
Non-Removable Device: Indicates which port(s) include non-removable devices. ‘0’ = port is removable, ‘1’ = port is non-removable.
Bit 7:3: Reserved, always = ‘0’
Bit 2= 1; Port 2 non-removable.
Bit 1= 1; Port 1 non removable.
Bit 0 is Reserved, always = ‘0’.
5.3.9.11
Register 0Ah: Port Disable For Self Powered Operation (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PORT_DIS_SP
Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
Bit 7:3= 0; ReservedBit 2= 1; Port 2 is disabled.
Bit 1= 1; Port 1 is disabled.
Bit 0 is Reserved, always = ‘0’
5.3.9.12
Register 0Bh: Port Disable For Bus Powered Operation (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
PORT_DIS_BP
Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
Bit 7:3= 0; ReservedBit 2= 1; Port 2 is disabled.
Bit 1= 1; Port 1 is disabled.
Bit 0 is Reserved, always = ‘0’
5.3.9.13
Register 0Ch: Max Power For Self Powered Operation (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
MAX_PWR_SP
Max Power Self_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA.
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2-Port USB 2.0 Hub Controller
Datasheet
5.3.9.14
Register 0Dh: Max Power For Bus Powered Operation (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
MAX_PWR_BP
Max Power Bus_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combined power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
A value of 50 (decimal) indicates 100mA.
5.3.9.15
Register 0Eh: Hub Controller Max Current For Self Powered Operation (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
HC_MAX_C_SP
Hub Controller Max Current Self-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a selfpowered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA, which is the default value.
5.3.9.16
Register 0Fh: Hub Controller Max Current For Bus Powered Operation (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
HC_MAX_C_BP
Hub Controller Max Current Bus-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a buspowered 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.
A value of 50 (decimal) would indicate 100mA, which is the default value.
5.3.9.17
Register 10h: Power-On Time (Reset = 0x00)
BIT
NUMBER
BIT NAME
DESCRIPTION
7:0
POWER_ON_TIME
Power On Time: The length of time that it 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.
5.3.9.18
Undefined Registers
The registers shown in Table 5.4 are the defined registers in the Hub. Reads to undefined registers
return 00h. Writes to undefined registers have no effect and do not return an error.
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Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
5.3.9.19
Reserved Registers
Unless otherwise instructed, only a ‘0’ may be written to all reserved registers or bits.
5.4
Default Configuration Option:
The SMSC Hub can be configured via its internal default configuration. (please see for specific details
on how to enable default configuration.
Please refer to Table 5.1 on page 19 for the internal default values that are loaded when this option is
selected.
5.5
Default Strapping Options:
The SMSC Hub can be configured via a combination of internal default values and pin strap options.
Please see Table 4.1, "7-Port Hub Pin Descriptions" for specific details on how to enable the
default/pin-strap configuration option.
The strapping option pins only cover a limited sub-set of the configuration options. The internal default
values will be used for the bits & registers that are not controlled by a strapping option pin. Please
refer to Table 5.1 on page 19 for the internal default values that are loaded when this option is selected.
The Green LED pins are sampled after RESET_N negation, and the logic values are used to configure
the hub if the internal default configuration mode is selected. The implementation shown below (see
Figure 5.1) shows a recommended passive scheme. When a pin is configured with a “Strap High”
configuration, the LED functions with active low signalling, and the PAD will “sink” the current from the
external supply. When a pin is configured with a “Strap Low” configuration, the LED functions with
active high signalling, and the PAD will “source” the current to the external LED.
+V
Strap High
50K
GR1
HUB
GR2
Strap Low
50K
Figure 5.1 LED Strapping Option
5.6
Reset
There are two different resets that the Hub experiences. One is a hardware reset (via the RESET_N
pin) and the second is a USB Bus Reset.
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2-Port USB 2.0 Hub Controller
Datasheet
5.6.1
External Hardware RESET_N
A valid hardware reset is defined as, assertion of RESET_N for a minimum of 1us after all power
supplies are within operating range. While reset is asserted, the Hub (and its associated external
circuitry) consumes less than 500μA of current from the upstream USB power source (300μA for the
Hub and 200μA for the external circuitry).
Assertion of RESET_N (external pin) causes the following:
1. All downstream ports are disabled, and PRTPWR power to downstream devices is removed.
2. The PHYs are disabled, and the differential pairs will be in a high-impedance state.
3. All transactions immediately terminate; no states are saved.
4. All internal registers return to the default state (in most cases, 00(h)).
5. The external crystal oscillator is halted.
6. The PLL is halted.
7. LED indicators are disabled.
The Hub is “operational” 500μs after RESET_N is negated.
Once operational, the Hub immediately reads OEM-specific data from the external EEPROM (if the
SMBus option is not disabled).
5.6.1.1
RESET_N for Strapping Option Configuration
Hardware
reset
asserted
Drive Strap
Outputs to
inactive
levels
Read Strap
Options
t1
Attach
USB
Upstream
USB Reset
recovery
t5
Start
completion
request
response
Idle
t7
t6
t8
t2
t3
RESET_N
VSS
t4
Strap Pins
Don’t Care
Valid
Driven by Hub if strap is an output.
Don’t Care
VSS
Figure 5.2 Reset_N Timing for Default/Strap Option Mode
Table 5.5 Reset_N Timing for Default/Strap Option Mode
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).
t1
RESET_N Asserted.
t2
SMSC USB2502
2.0
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1400
nsec
1.5
μsec
100
msec
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
Table 5.5 Reset_N Timing for Default/Strap Option Mode (continued)
NAME
DESCRIPTION
MIN
t6
Host acknowledges attach and signals USB
Reset.
t7
USB Idle.
t8
Completion time for requests (with or without data
stage).
TYP
MAX
UNITS
100
msec
undefined
msec
5
msec
Notes:
5.6.1.2
When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
100mA from the upstream USB power source during t1+t5.
All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
RESET_N for EEPROM Configuration
Hardware
reset
asserted
Attach
USB
Upstream
Read EEPROM
+
Set Options
Read Strap
Options
USB Reset
recovery
Start
completion
request
response
Idle
t4
t1
t2
t5
t3
t6
t7
RESET_N
VSS
Figure 5.3 Reset_N Timing for EEPROM Mode
Table 5.6 Reset_N Timing for EEPROM Mode
NAME
DESCRIPTION
MIN
t1
RESET_N Asserted.
t2
Hub Recovery/Stabilization.
t3
EEPROM Read / Hub Config.
t4
USB Attach (See Note).
t5
Host acknowledges attach and signals USB
Reset.
t6
USB Idle.
t7
Completion time for requests (with or without data
stage).
TYP
MAX
UNITS
μsec
1
2.0
500
μsec
99.5
msec
100
msec
100
msec
undefined
msec
5
msec
Notes:
When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
100mA from the upstream USB power source during t4+t5+t6+t7.
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2-Port USB 2.0 Hub Controller
Datasheet
All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
RESET_N for SMBus Slave Configuration
5.6.1.3
Hardware
reset
asserted
Reset
Negation
t1
SMBus Code
Load
t2
Hub PHY
Stabilization
Attach
USB
Upstream
t3
t4
USB Reset
recovery
Start
completion
request
response
Idle
t6
t5
t7
RESET_N
VSS
Figure 5.4 Reset_N Timing for SMBus Mode
Table 5.7 Reset_N Timing for SMBus Mode
NAME
DESCRIPTION
MIN
t1
RESET_N Asserted.
t2
Hub Recovery/Stabilization.
t3
SMBus Code Load (See Note).
t4
Hub Configuration and USB Attach.
t5
Host acknowledges attach and signals USB
Reset.
t6
USB Idle.
t7
Completion time for requests (with or without data
stage).
TYP
MAX
UNITS
μsec
1
10
500
μsec
99.5
msec
100
msec
100
msec
Undefined
msec
5
msec
Notes:
For Bus-Powered configurations, the 99.5ms (MAX) is required, and the Hub and its associated
circuitry must not consume more than 100mA from the upstream USB power source during
t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load
the configuration is determined by the external SMBus host.
All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
SMSC USB2502
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2-Port USB 2.0 Hub Controller
Datasheet
5.6.2
USB Bus Reset
In response to the upstream port signaling a reset to the Hub, the Hub does the following:
Note: The Hub does not propagate the upstream USB reset to downstream devices.
1. Sets default address to 0.
2. Sets configuration to: Unconfigured.
3. Negates PRTPWR to all downstream ports.
4. Clears all TT buffers.
5. Moves device from suspended to active (if suspended).
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 USB
Specification.
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2-Port USB 2.0 Hub Controller
Datasheet
Chapter 6 XNOR Test
XNOR continuity tests all signal pins on the Hub (every pin except for NC, XTAL1/CLKIN, XTAL2,
ATEST/REG_EN, RBIAS, TEST, Power, and Ground). This functionality is enabled by driving TEST
and CFG_SEL[1] high, driving SCLK low and transition RESET_N from low to high. The output from
the XNOR chain is driven to GR2 . For each pin tested for continuity GR2 should toggle.
SMSC USB2502
37
DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
Chapter 7 DC Parameters
7.1
Maximum Guaranteed Ratings
PARAMETER
SYMBOL
MIN
MAX
UNITS
Storage
Temperature
TA
-55
150
°C
325
°C
Lead
Temperature
1.8V supply
voltage
VDDA18PLL
VDD18
-0.3
2.5
V
3.3V supply
voltage
VDDA33
VDDA33PLL
-0.3
4.0
V
Voltage on any
I/O pin
-0.3
(3.3V supply voltage + 2) ≤ 6
V
Voltage on
XTAL1
-0.3
4.0
V
Voltage on
XTAL2
-0.3
VDD18 + 0.3V
V
COMMENTS
Soldering < 10 seconds
VDD33CR
Note: 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. 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.
Revision 2.3 (08-27-07)
38
DATASHEET
SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
7.2
Recommended Operating Conditions
PARAMETER
SYMBOL
MIN
MAX
UNITS
Operating
Temperature
TA
0
70
°C
1.8V supply voltage
VDDA18PLL
VDD18
1.62
1.98
V
3.3V supply voltage
VDDA33
VDDA33PLL
3.0
3.6
V
-0.3
5.5
V
COMMENTS
VDD33CR
Voltage on any I/O pin
If any 3.3V supply voltage drops
b e l o w 3 . 0 V, t h e n t h e M A X
becomes:
(3.3V supply voltage + 0.5)
Voltage on XTAL1
-0.3
VDDA33
V
Voltage on XTAL2
-0.3
VDD18
V
Table 7.1 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
IIL
-10
VHYSI
250
Input Leakage
Hysteresis (‘IS’ Only)
TTL Levels
V
300
+10
uA
350
mV
0.8
V
VIN = 0 to VDD33CR
Input Buffer with Pull-Up
(IPU)
Low Input Level
VILI
High Input Level
VIHI
2.0
IILL
+5
+45
uA
IIHL
-10
+10
uA
Low Input Leakage
High Input Leakage
TTL Levels
V
VIN = 0
VIN = VDD33CR
Input Buffer with Pull-Down
IPD
Low Input Level
VILI
High Input Level
VIHI
2.0
IILL
+10
-10
uA
IIHL
-80
-160
uA
Low Input Leakage
High Input Leakage
SMSC USB2502
0.8
V
TTL Levels
V
VIN = 0
VIN = VDD33CR
39
DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
Table 7.1 DC Electrical Characteristics (continued)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
0.8
V
COMMENTS
ICLK Input Buffer
Low Input Level
VILCK
High Input Level
VIHCK
2.0
IIL
-10
+10
uA
VHYSC
50
100
mV
0.4
V
Input Leakage
Hysteresis
TTL Levels
V
VIN = 0 to VDD33CR
O8 and I/O8 Type Buffer
Low Output Level
High Output Level
Output Leakage
VOL
VOH
2.4
IOL
-10
V
IOL = 8 mA @ VDD33CR = 3.3V
IOH = -4mA @ VDD33CR = 3.3V
+10
uA
0.4
V
IOL = 12 mA @ VDD33CR = 3.3V
+10
µA
350
mV
VIN = 0 to VDD33CR
(Note 1)
VIN = 0 to VDD33CR
(Note 1)
I/OSD12 Type Buffer
Low Output Level
VOL
Output Leakage
IOL
-10
VHYSI
250
Hysteresis
300
IO-U
(Note 2)
I-R
(Note 3)
Supply Current Unconfigured
High-Speed Host
Full-Speed Host
ICCINIT
ICCINIT
73
65
mA
mA
Supply Current
Configured
(High-Speed Host)
2 Ports @ FS/LS
2 Ports @ HS
1 Port HS, 1 Port FS/LS
Total from all supplies
IHCC2
IHCH2
IHCH1C1
120
170
140
mA
mA
mA
Total from all supplies
Supply Current
Configured
(Full-Speed Host)
1 Port
2 Ports
Revision 2.3 (08-27-07)
IFCC1
IFCC2
90
90
40
DATASHEET
mA
mA
SMSC USB2502
2-Port USB 2.0 Hub Controller
Datasheet
Table 7.1 DC Electrical Characteristics (continued)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
COMMENTS
Supply Current
Suspend
ICSBY
320
425
uA
Total from all supplies.
Supply Current
Reset
IRST
160
300
uA
Total from all supplies.
Notes:
1. Output leakage is measured with the current pins in high impedance.
2. See USB 2.0 Specification for USB DC electrical characteristics.
3. RBIAS is a 3.3V tolerant analog pin.
CAPACITANCE TA = 25°C; fc = 1MHz; VDD33CR = 3.3V
LIMITS
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
TEST CONDITION
All pins except USB pins (and pins under
test tied to AC ground)
Clock Input
Capacitance
CIN
12
pF
Input Capacitance
CIN
8
pF
COUT
12
pF
Output Capacitance
Power Sequencing
There are no power supply sequence restrictions for the Hub. The order in which power supplies
power-up and power-down is implementation dependent.
SMSC USB2502
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DATASHEET
Revision 2.3 (08-27-07)
2-Port USB 2.0 Hub Controller
Datasheet
Chapter 8 AC Specifications
8.1
Oscillator/Clock
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ±100ppm.
External Clock: 50% Duty cycle ± 10%, 24 MHz ± 100ppm, Jitter < 100ps rms.
8.1.1
SMBus Interface:
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the SMBus 1.0 Specification for Slave-Only devices (except as noted in Section 5.3).
8.1.2
I2C EEPROM:
Frequency is fixed at 59KHz ± 20%.
8.1.3
USB 2.0
The Hub conforms to all voltage, power, and timing characteristics and specifications as set forth in
the USB 2.0 Specification. Please refer to the USB Specification for more information.
Revision 2.3 (08-27-07)
42
DATASHEET
SMSC USB2502
REVISION HISTORY
D
DESCRIPTION
DATE
RELEASED BY
-
SEE SPEC FRONT PAGE FOR REVISION HISTORY
-
-
D2
D1
3
REVISION
TERMINAL #1
IDENTIFIER AREA
(D/2 X E/2)
e
3
TERMINAL #1
IDENTIFIER AREA
(D1/2 X E1/2)
E1
E
E2
EXPOSED PAD
0.6(MAX)
36X L
0.6(MAX)
CHAMFERED CORNERS
ARE OPTIONAL 4X
4
36X 0.2 MIN
TOP VIEW
36X b 2
BOTTOM VIEW
4X 0°-12°
43
DATASHEET
C
4
A2
ccc C
A
A1
A3
SIDE VIEW
D2 / E2 VARIATIONS
CATALOG PART
3-D VIEWS
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN MILLIMETERS
AND TOLERANCES ARE:
SMSC USB2502
NOTES:
1. ALL DIMENSIONS ARE IN MILLIMETER.
2. POSITION TOLERANCE OF EACH TERMINAL IS ± 0.05mm AT MAXIMUM MATERIAL CONDITION. DIMENSIONS
"b" APPLIES TO PLATED TERMINALS AND IT IS MEASURED BETWEEN 0.15 AND 0.30 mm FROM THE
TERMINAL TIP.
3. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL BUT MUST BE LOCATED WITHIN THE AREA INDICATED.
4. COPLANARITY ZONE APPLIES TO EXPOSED PAD AND TERMINALS.
DECIMAL
±0.1
X.X
X.XX ±0.05
X.XXX ±0.025
THIRD ANGLE PROJECTION
80 ARKAY DRIVE
HAUPPAUGE, NY 11788
USA
ANGULAR
±1°
TITLE
NAME
DATE
S.K.ILIEV
12/6/04
DIM AND TOL PER ASME Y14.5M - 1994
MATERIAL
FINISH
-
DRAWN
S.K.ILIEV
S.K.ILIEV
Figure 9.1 36 Pin QFN Package
REV
DWG NUMBER
CHECKED
MO-36-QFN-6x6
12/6/04
APPROVED
PRINT WITH "SCALE TO FIT"
DO NOT SCALE DRAWING
PACKAGE OUTLINE
36 TERMINAL QFN, 6x6mm BODY, 0.5mm PITCH
SCALE
12/6/04
STD COMPLIANCE
1:1
JEDEC: MO-220
F
SHEET
1 OF 1
2-Port USB 2.0 Hub Controller
Datasheet
Revision 2.3 (08-27-07)
Chapter 9 Package Outlines
2-Port USB 2.0 Hub Controller
Datasheet
Figure 9.2 48 Pin TQFP Package Outline (7x7x1.4 mm body, 2mm Footprint)
Table 9.1 48 Pin TQFP Package
MIN
NOMINAL
MAX
REMARKS
A
A1
A2
D
D1
E
E1
H
L
L1
~
0.05
1.35
8.80
6.90
8.80
6.90
0.09
0.45
~
1.60
0.15
1.45
9.20
7.10
9.20
7.10
0.20
0.75
~
e
θ
~
~
~
~
~
~
~
~
0.60
1.00
0.50 Basic
Overall Package Height
Standoff
Body Thickness
X Span
X body Size
Y Span
Y body Size
Lead Frame Thickness
Lead Foot Length
Lead Length
Lead Pitch
0o
~
7o
Lead Foot Angle
W
R1
R2
ccc
0.17
0.08
0.08
~
0.22
~
~
~
0.27
~
0.20
0.08
Lead Width
Lead Shoulder Radius
Lead Foot Radius
Coplanarity
Notes:
1. Controlling Unit: millimeter.
2. Tolerance on the true position of the leads is ± 0.04 mm maximum.
3. Package body dimensions D1 and E1 do not include the mold protrusion.
Maximum mold protrusion is 0.25 mm.
4. Dimension for foot length L measured at the gauge plane 0.25 mm above the seating plane.
5. Details of pin 1 identifier are optional but must be located within the zone indicated.
Revision 2.3 (08-27-07)
44
DATASHEET
SMSC USB2502
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