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Microchip Technology USB2422, USB2422T, USB2422-I, USB2422T-I General Description Manual

USB2422
2-Port USB 2.0 Hi-Speed Hub Controller
PRODUCT FEATURES
General Description
The Microchip USB2422 hub is a low-power, single transaction translator, hub controller IC with two downstream ports for embedded USB solutions. The hub controller can attach to an upstream port as a Hi-Speed and Full-Speed hub or as a Full-Speed only hub. The hub supports Low-Speed, Full-Speed, and Hi-Speed (when configured as a Hi-Speed hub) downstream devices on the enabled downstream ports.
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.
Features
Supports the USB Battery Charging Specification,
Revision 1.1
Fully integrated USB termination and pull-up/pull-
down 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 pinsSupports self-powered operationThe hub contains a built-in default configuration; no
external configuration options or components are required
Downstream ports as non-removable portsDownstream port power control and over-current
detection on an individual or ganged basis
Supports compound devices on a port-by-port basis24-pin SQFN (4x4 mm), RoHS-compliant packageCommercial temperature range support:
0ºC to +70ºC
Industrial temperature range support:
-40ºC to +85ºC
Datasheet
Highlights
High performance, low-power, small footprint hub
controller IC with two downstream ports
Fully compliant with the USB 2.0 SpecificationOptimized for minimal bill-of-materials and low-cost
designs
Applications
LCD monitors and TVsMulti-function USB peripheralsPC motherboardsSet-top boxes, DVD players, DVR/PVRPrinters and scannersPC media drive bayPortable hub boxesMobile PC dockingEmbedded systemsGaming consolesCable/DSL modemsHDD enclosuresKVM switchesServer front panelsPoint-of-Sale (POS) systemsIP telephonyAutomobile/home audio systemsThin client terminals
2014 Microchip Technology Inc. DS00001726A-page 1
ORDER NUMBERS
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Order Numbers:
ROHS COMPLIANT
PACKAGE TEMP. RANGE REEL SIZE
USB2422/MJ
USB2422T/MJ 0ºC to +70ºC
USB2422-I/MJ -40ºC to +85ºC
24-Pin SQFN
4 x 4 mm
0ºC to +70ºC
USB2422T-I/MJ -40ºC to +85ºC
-
4000
-
4000
This product meets the halogen maximum concentration values per IEC61249-2-21
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via E-mail at docerrors@microchip.com. We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page. The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur­rent devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site; http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are using.
Customer Notification System
Register on our web site at www.microchip.com to receive the most current information on all of our products.
DS00001726A-page 2  2014 Microchip Technology Inc.
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 Description
BIT
FIELD.BIT
x…y Range from x to y, inclusive
BITS[m:n]
PIN Pin Name
zzzzb Binary number (value zzzz) 0xzzz Hexadecimal number (value zzz)
zzh Hexadecimal number (value zz)
rsvd Reserved memory location. Must write 0, read value indeterminate
code Instruction code, or API function or parameter
Section Name Section or Document name
x Don’t care
<Parameter> <> indicate a Parameter is optional or is only used under some conditions
{,Parameter} Braces indicate Parameter(s) that repeat one or more times
[Parameter]
Name of a single bit within a field Name of a single bit (BIT) in FIELD
Groups of bits from m to n, inclusive
Brackets indicate a nested Parameter. This Parameter is not real and actually decodes into one or more real parameters.
2014 Microchip Technology Inc. DS00001726A-page 3
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 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Pin Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Pin Descriptions (Grouped by Function). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5 Strap Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.1 Non-Removable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.2 Internal Pull-Down (IPD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.5.3 LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.6 Example Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chapter 3 Battery Charging Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1 USB Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1.1 Special Behavior of PRTPWR Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Battery Charging Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.1 Battery Charging Enabled via SMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Chapter 4 Configuration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1 Hub Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2 Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.1 External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.2 USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3 SMBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.1 SMBus Slave Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.2 Protocol Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.3 Slave Device Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.4 Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.5 SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.6 Bus Reset Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.7 SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.4 SMBus Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4.1 Vendor ID Least Significant Bit Register (VIDL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.2 Vendor ID Most Significant Bit Register (VIDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4.3 Product ID Least Significant Bit Register (PIDL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.4 Product ID Most Significant Bit Register (PIDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.5 Device ID Least Significant Bit Register (DIDL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.6 Device ID Most Significant Bit Register (DIDM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.4.7 Configuration Data Byte 1 Register (CFG1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.4.8 Configuration Data Byte 2 Register (CFG2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.4.9 Configuration Data Byte 3 Register (CFG3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4.10 Non-Removable Device Register (NRD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4.11 Port Disable for Self-Powered Operation Register (PDS) . . . . . . . . . . . . . . . . . . . . . . . . 31
4.4.12 Port Disable for Bus-Powered Operation Register (PDB) . . . . . . . . . . . . . . . . . . . . . . . . 31
4.4.13 Max Power for Self-Powered Operation Register (MAXPS) . . . . . . . . . . . . . . . . . . . . . . 32
4.4.14 Max Power for Bus-Powered Operation Register (MAXPB) . . . . . . . . . . . . . . . . . . . . . . 32
4.4.15 Hub Controller Max Current for Self-Powered Operation Register (HCMCS) . . . . . . . . . 32
4.4.16 Hub Controller Max Power for Bus-Powered Operation Register (HCMCB). . . . . . . . . . 33
4.4.17 Power-On Time Register (PWRT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.18 Language ID High Register (LANGIDH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
DS00001726A-page 4  2014 Microchip Technology Inc.
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
4.4.19 Language ID Low Register (LANGIDL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4.20 Manufacturer String Length Register (MFRSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.21 Product String Length Register (PRDSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.22 Serial String Length Register (SERSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.23 Manufacturer String Registers (MANSTR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.24 Product String Registers (PRDSTR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.4.25 Serial String Registers (SERSTR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.4.26 Battery Charging Enable Register (BC_EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.4.27 Boost Upstream Register (BOOSTUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.4.28 Boost Downstream Register (BOOST40) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.4.29 Port Swap Register (PRTSP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4.30 Port 1/2 Remap Register (PRTR12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.4.31 Status/Command Register (STCD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Chapter 5 DC Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.1 Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.2 Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.2.1 Pin Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Chapter 6 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1 Oscillator/Crystal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.2 External Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.2.1 USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.3 SMBus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Chapter 7 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Chapter 8 Datasheet Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
2014 Microchip Technology Inc. DS00001726A-page 5
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
List of Figures
Figure 1.1 USB2422 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 2.1 USB2422 24-Pin SQFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 2.2 Non-Removable Pin Strap Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 2.3 IPD Pin Strap Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 2.4 LED Pin Strap Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 2.5 Example Application - SoC Based Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 2.6 Example Application - Non-SoC Based Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 3.1 Battery Charging via External Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 4.1 Hub Configuration Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 4.2 Block Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 4.3 Block Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 5.1 Supply Rise Time Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 6.1 Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 6.2 Formula to Find the Value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 7.1 24-SQFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 7.2 Taping Dimensions and Part Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 7.3 Reel Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 7.4 Tape Length and Part Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
DS00001726A-page 6  2014 Microchip Technology Inc.
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
List of Tables
Table 2.1 USB2422 Pin Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2.2 USB2422 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 2.3 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 2.4 Strap Option Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 2.5 Example Applications - Resistor/Capacitor Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 4.1 Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 4.2 Hub Configuration Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 5.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 5.2 Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 6.1 Crystal Circuit Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 8.1 Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
2014 Microchip Technology Inc. DS00001726A-page 7

Chapter 1 Block Diagram

To Upstream
V
BUS
3.3V
Upstream
PHY
Upstream USB
Data
Repeater
Controller
SIE
Serial
Interface
PLL
24 MHz Crystal
To
SMBus Master
Routing & Port Re-Ordering
Logic
SMBCLK
SMBDATA
Port
Controller
Bus-Power Detect/V
BUS
Pulse
TT
PHY#1
Port #1
OC
Sense
Switch
Driver
PHY#2
Port #2
OC
Sense
Switch
Driver
USB Data
Downstream
OC Sense
Switch
USB Data
Downstream
OC Sense
Switch
CRFILT PLLFILT
1.2V Reg
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Figure 1.1 USB2422 Block Diagram
DS00001726A-page 8  2014 Microchip Technology Inc.
2-Port USB 2.0 Hi-Speed Hub Controller
Thermal Slug
(must be connected to VSS)
12
11
10
9
8
7
USBDP_UP
19
XTALOUT/(CLKIN_EN)
20
XTALIN/CLKIN
21
RBIAS
24
23
PLLFILT
22
1
VDD33
2
USBDP_DN1/PRT_DIS_P1
3
USBDM_DN2/PRT_DIS_M2
4
USBDP_DN2/PRT_DIS_P2
5
6
USBDM_DN1/PRT_DIS_M1
NC
USBDM_UP
17
SUSP_IND/LOCAL_PWR/(NON_REM0)16VBUS_DET
RESET_N
15
14
SMBCLK/CFG_SEL0
VDD33
18
13
SMBDATA/NON_REM1
Indicates pins on the bottom of the device.
OCS1_N
PRTPWR1/(BC_EN1)
VDD33
CRFILT
PRTPWR2
OCS2_N
USB2422
(Top View SQFN-24)
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.

2.1 Pin Configuration

2014 Microchip Technology Inc. DS00001726A-page 9
Figure 2.1 USB2422 24-Pin SQFN

2.2 Pin Table

2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Table 2.1 USB2422 Pin Table
UPSTREAM USB 2.0 INTERFACES (3 PINS)
USBDM_UP
USBDP_DN1/
PRT_DIS_P1
PRTPWR1/
BC_EN1
RBIAS
SMBDATA/
NON_REM1
XTALIN/
CLKIN
NC
USBDM_UP
DOWNSTREAM 2-PORT USB 2.0 INTERFACES (9 PINS)
USBDM_DN1/
PRT_DIS_M1
PRTPWR2 OCS1_N OCS2_N
SERIAL PORT INTERFACE (2 PINS)
SMBCLK/
CFG_SEL
MISC (5 PINS)
XTALOUT/ CLKIN_EN
VBUS_DET
USBDP_DN2/
PRT_DIS_P2
RESET_N
USBDM_DN2/
PRT_DIS_M2
SUSP_IND/
LOCAL_PWR/
NON_REM0
POWER, GROUND, AND NO CONNECTS (5 PINS)
(3) VDD33 CRFILT PLLFILT VSS
TOTAL 24
DS00001726A-page 10 2014 Microchip Technology Inc.
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
19 20
16 VBUS_DET I Detect Upstream VBUS Power:
5 3
and
4 2
USBDM_UP USBDP_UP
USBDP_DN[2:1]/
PRT_DIS_P[2:1]
and USBDN_DN[2:1]/ PRT_DIS_M[2:1]
BUFFER
TYPE DESCRIPTION
UPSTREAM USB 2.0 INTERFACES
IO-U USB Bus Data:
Connect to the upstream USB bus data signals (host, port, or upstream hub).
Detects the state of upstream VBUS power. The 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
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
2014 Microchip Technology Inc. DS00001726A-page 11
OCS1_N OCS2_N
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.
2-Port USB 2.0 Hi-Speed Hub Controller
Table 2.2 USB2422 Pin Descriptions (continued)
Datasheet
PIN
# SYMBOL
BUFFER
TYPE DESCRIPTION
24 RBIAS I-R 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 System Management Bus Data
NON_REM1 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] = 00: all ports are removable NON_REM[1:0] = 01: port 1 is non-removable NON_REM[1:0] = 10: ports 1 and 2 are non-removable NON_REM[1:0] = 11: reserved
See Section 2.5, "Strap Pin Configuration" for details.
14 SMBCLK/ I/OSD12 System Management Bus Clock
CFG_SEL 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 XTALIN/
CLKIN
ICLKx 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.
21 XTALOUT OCLKx 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 IPD Treat as a no connect pin or connect to ground. No trace or signal
should be routed or attached to this pin.
DS00001726A-page 12 2014 Microchip Technology Inc.
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Table 2.2 USB2422 Pin Descriptions (continued)
PIN
# SYMBOL
BUFFER
TYPE DESCRIPTION
17 SUSP_IND I/O12 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.
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_REM0) 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] = 00: all ports are removable NON_REM[1:0] = 01: port 1 is non-removable NON_REM[1:0] = 10: ports 1 and 2 are non-removable NON_REM[1:0] = 11: reserved
See Section 2.5, "Strap Pin Configuration" for details.
POWER, GROUND, and NO CONNECTS
1 9
18
VDD33 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.
10 CRFILT 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.
2014 Microchip Technology Inc. DS00001726A-page 13

2.4 Buffer Type Descriptions

HUB
I/O Strap Pin Strap High
+V
HUB
I/O Strap Pin Strap Low
GND
R kΩ
R kΩ
Table 2.3 Buffer Type Descriptions
BUFFER DESCRIPTION
I/O Input/Output
IPD Input with internal weak pull-down resistor
IPU Input with internal weak pull-up resistor
IS Input with Schmitt trigger
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 Analog Input/Output defined in USB specification
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet

2.5 Strap Pin Configuration

If a pin's strap function is enabled through hub configuration selection (Ta b le 4 .1 ), the strap pins must be pulled either high or low using the values provided in Ta bl e 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 RESISTOR VALUE BUFFER TYPE NOTES
Non-Removable 47 - 100 kΩ I/O
Internal Pull-Down (IPD)
10 kΩ IPD
LED 47 - 100 kΩ I/O

2.5.1 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)
Only applicable to port power pinsContains a built-in resistor
DS00001726A-page 14 2014 Microchip Technology Inc.
Figure 2.2 Non-Removable Pin Strap Example
2-Port USB 2.0 Hi-Speed Hub Controller
HUBHUB
IPD Strap Pin Strap High
R kΩ
+V
VSS
IPD Strap Pin Strap Low
VSS
HUB
Strap Pin
LED/
Strap High
HUB
Strap Pin
LED/
Strap Low
R
kΩ
R
kΩ
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.
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.
2014 Microchip Technology Inc. DS00001726A-page 15
Figure 2.4 LED Pin Strap Example

2.6 Example Applications

Embedded
Device
SOC
USB2422
SMBCLK
SMBDATA
RESET_N
XTALOUT
XTALIN
SUSP_IND
RBIAS
VDD33 (1,9,18)
PLLFILT
CRFILT
N/C
PRTPWR1
OCS1_N
USBDP_DN1
USBDM_DN1
PRTPWR2(11)
OCS2_N(12) USBDP_DN2 USBDM_DN2
GND
R
BIAS
C
BYPCOUTCRCOUTPLL
Vcc
USB Switch
Enable
FAULT_N
RESET_N
Clock
VBUS_DET
USBDP_UP
USBDM_UP
Connector
3.3V
USB
Connector
R
VBUS
R
VBUS
USB2422
VBUS_DET
USBDP_UP
USBDM_UP
CFG_SEL0(14)
NON_REM1(13)
RESET_N
XTAL1(22)
XTAL2(21)
NON_REM0(17)
RBIAS
VDD33 (1,9,18)
PLLFILT
CRFILT
N/C
PRTPWR2(11)
OCS2_N(12)
USBDP_DN2
USBDM_DN2
PRTPWR1
OCS1_N
USBDP_DN1
USBDM_DN1
GND
R2
R2
R
BIAS
C
BYP
C
OUTCR
C
OUTPLL
USB
Connector
Charger Enabled
Port
Non-removable
Device
R
VBUS
R
VBUS
R2
Vcc
Vcc
R1
Vcc
24MHz
Power Switch
Cx
Cx
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 Ta b le 2 .5 .
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Figure 2.5 Example Application - SoC Based Design
DS00001726A-page 16 2014 Microchip Technology Inc.
Figure 2.6 Example Application - Non-SoC Based Design
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