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产品型号USB2412-DZK的概述

USB2412-DZK芯片概述 USB2412-DZK是一款高性能的USB 2.0集线器控制器，专为需要多个USB端口的应用而设计。其主要功能为扩展USB接口，使得设备可以连接多达两个USB设备。该芯片适用于广泛的应用场景，包括电脑外设、移动设备、嵌入式系统，以及需要USB接口的各种电子产品。 USB2412-DZK的设计考虑了系统的易用性和成本效益，特定的电源管理特性和数据传输功能，使其成为流行的选择之一。此芯片支持多种数据传输模式，包括全速（12 Mbps）和低速（1.5 Mbps），能够满足大多数USB外设的需求。芯片详细参数 USB2412-DZK的主要参数包括： 1. 供电电压: 2.7V至5.5V 2. 工作温度范围: -40°C至85°C 3. 封装类型: QFN, 32引脚 4. 数据传输速率: 12 Mbps（全速模式），1.5 Mbps（低速模式） 5. 输入输出...

产品型号USB2412-DZK的Datasheet PDF文件预览

USB2412

2-Port USB 2.0 Hi-Speed

Hub Controller

Datasheet

PRODUCT FEATURES

General Description

Highlights

High performance, low-power, small footprint hub

controller IC with two downstream ports

The SMSC USB2412 hub is a low-power, single

transaction translator (STT) hub controller IC with two

downstream ports for embedded USB applications. The

SMSC hub controller supports low-speed, full-speed,

and hi-speed (if operating as a hi-speed hub)

downstream devices on all of the enabled downstream

ports.

Fully compliant with the USB 2.0 Specification 1.

28QFN low pin count package

Optimized for minimal bill-of-materials and low cost

designs

Applications

Features

Automobile/home audio systems

Cable/DSL modems

Embedded systems

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

Gaming consoles

HDD enclosures

On-chip 24 MHz crystal driver or external 24 MHz

clock input

IP telephony

KVM switches

ESD protection up to 4 kilovolts on all USB pins

Supports self-powered operation

LCD monitors and TVs

Multi-function USB peripherals

Mobile PC docking

Contains a built-in default configuration; no external

configuration options or components are required

PC motherboards

Downstream ports as optional non-removable ports

Supports compound devices on a port-by-port basis

PC media drive bay

Portable hub boxes

28-pin QFN (5 x 5 mm) lead-free RoHS compliant

package

Point-of-Sale (POS) systems

Printers and scanners

Server front panels

Supports the commercial temperature range:

0ºC to +70ºC

Set-top boxes, DVD players, DVR/PVR

Thin client terminals

SMSC USB2412

DATASHEET

Revision 1.3 (12-27-11)

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Order Numbers:

LEAD-FREE

ROHS COMPLIANT

PACKAGE

ORDER NUMBERS^*

PACKAGE SIZE

REEL SIZE

USB2412-DZK

USB2412-DZK-TR

28-Pin QFN Lead-Free, RoHS

Compliant Package

(includes tape and reel option)

5 x 5 x 0.5 mm

This product meets the halogen maximum concentration values per IEC61249-2-21

For RoHS compliance and environmental information, please visit www.smsc.com/rohs

80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000 or 1 (800) 443-SEMI

Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for

construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC

reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications

before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent

rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated

version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors

known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not

designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property

damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of

this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered

trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.

SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE

OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL

DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;

TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD

TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Revision 1.3 (12-27-11)

SMSC USB2412

DATASHEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Conventions

Within this manual, the following abbreviations and symbols are used to improve readability.

Example

BIT

Description

Name of a single bit within a field

Name of a single bit (BIT) in FIELD

Range from x to y, inclusive

Groups of bits from m to n, inclusive

Pin Name

FIELD.BIT

x…y

BITS[m:n]

zzzzb

Binary number (value zzzz)

Hexadecimal number (value zzz)

Hexadecimal number (value zz)

0xzzz

zzh

rsvd

Reserved memory location. Must write 0, read value indeterminate

Instruction code, or API function or parameter

Section or Document name

code

Section Name

Don’t care

{,Parameter}

<> indicate a Parameter is optional or is only used under some conditions

Braces indicate Parameter(s) that repeat one or more times

Brackets indicate a nested Parameter. This Parameter is not real and actually decodes

into one or more real parameters.

[Parameter]

SMSC USB2412

Revision 1.3 (12-27-11)

DATASHEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Table of Contents

Chapter 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 2 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1

2.2

2.3

2.4

2.5

Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

28-Pin Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Pin Descriptions (Grouped by Function). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Strap Option Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Chapter 3 Internal Default Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1

3.2

Hub Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2.1

3.2.2

External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Chapter 4 DC Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.1

4.2

Maximum Guaranteed Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.1

4.2.2

Pin Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Package Thermal Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Chapter 5 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.1

5.2

Oscillator/Crystal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

External Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.2.1

USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Chapter 6 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.1

Tape and Reel Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Revision 1.3 (12-27-11)

SMSC USB2412

DATASHEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

List of Figures

Figure 1.1 USB2412 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2.1 USB2412 28-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 2.2 Non-Removable Pin Strap Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 2.3 LED Pin Strap Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 3.1 Reset_N Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 4.1 Supply Rise Time Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 5.1 Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 5.2 Formula to Find the Value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 6.1 USB2412 28-Pin QFN Package Outline (5x5 mm Body, 0.5 Pitch, 3.1 ePad). . . . . . . . . . . . 22

Figure 6.2 Recommended Printed Circuit Board (PCB) Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 6.3 28-Pin Package Tape Dimensions and Part Orientation (mm) . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 6.4 28-Pin Package Tape Length and Part Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 6.5 Package Reel Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

SMSC USB2412

Revision 1.3 (12-27-11)

DATASHEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

List of Tables

Table 2.1 USB2412 28-Pin Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 2.2 USB2412 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 2.3 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 3.1 Reset_N Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 4.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 4.2 Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 4.3 28-Pin QFN Package Thermal Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 5.1 Crystal Circuit Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 6.1 Package Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Revision 1.3 (12-27-11)

SMSC USB2412

DATASHEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Chapter 1 Block Diagram

Upstream

USB Data

To Upstream

V_BUS

24 MHz

Crystal

3.3 V

Bus-

Power

Detect/

Regulator

PLL

Upstream

PHY

V_busPulse

Serial

Interface

Engine

Controller

Repeater

3.3 V

Transaction

Translator

Port

Controller

Regulator

CRFILT

Routing & Port Re-Ordering Logic

PHY#2

PHY#1

USB Data

Downstream

USB Data

Downstream

Figure 1.1 USB2412 Block Diagram

SMSC USB2412

Revision 1.3 (12-27-11)

DATASHEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Chapter 2 Pin Descriptions

This chapter is organized by a set of pin configurations followed by a corresponding pin list organized

by function according to their associated interface. A detailed description list of each signal (named in

the pin list) is organized by function in Table 2.2, “USB2412 Pin Descriptions,” on page 10. Refer to

Table 2.3, “Buffer Type Descriptions,” on page 12 for a list of buffer types.

The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal

is at a low voltage level. When “N” is not present after the signal name, the signal is asserted when it

is at the high voltage level.

The terms assertion and negation are used exclusively. This is done to avoid confusion when working

with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a

signal is active, independent of whether that level is represented by a high or low voltage. The term

negate, or negation, indicates that a signal is inactive.

2.1

Pin Configuration

USBDP_UP

XTALOUT

XTALIN/CLKIN

PLLFILT

VDD33

NON_REM1

OCS_N2

PRTPWR2

VDD33

SMSC

USB2412

(Top View QFN-28)

RBIAS

VDD33

CRFILT

OCS_N1

USBDM_DN1

Ground Pad

(must be connected to VSS)

Indicates pins on the bottom of the device.

Figure 2.1 USB2412 28-Pin QFN

Revision 1.3 (12-27-11)

SMSC USB2412

DATASHEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

2.2

28-Pin Table

Table 2.1 USB2412 28-Pin Table

UPSTREAM USB 2.0 INTERFACES (3 PINS)

USBDP_UP

USBDM_UP

VBUS_DET

DOWNSTREAM 2-PORT USB 2.0 INTERFACES (9 PINS)

USBDP_DN1

PRT_PWR1

RBIAS

USBDM_DN1

PRT_PWR2

USBDP_DN2

OCS_N1

USBDM_DN2

OCS_N2

MISC (7 PINS)

RESET_N

TEST

XTALIN / CLKIN

HS_IND

XTALOUT

NON_REM1

SUSP_IND / NON_REM0

POWER, GROUND, AND NO CONNECTS (9 PINS)

CRFILT PLLFILT

(5) VDD33

VSS

TOTAL 28

SMSC USB2412

Revision 1.3 (12-27-11)

DATASHEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

2.3

Pin Descriptions (Grouped by Function)

Table 2.2 USB2412 Pin Descriptions

BUFFER

SYMBOL

TYPE

DESCRIPTION

UPSTREAM USB 2.0 INTERFACES

USBDM_UP

USBDP_UP

IO-U

USB Bus Data: connect to the upstream USB bus data signals (host,

port, or upstream hub).

VBUS_DET

I/O12

Detect Upstream VBUS Power: detects the state of upstream VBUS

power. The SMSC hub monitors VBUS_DET to determine when to

assert the internal D+ pull-up resistor which signals a connect event.

When designing a detachable hub, this pin should be connected to

VBUS on the upstream port via a 2 to 1 voltage divider.

For self-powered applications with a permanently attached host, this

pin must be connected to a dedicated host control output, or

connected to 3.3 V domain that powers the host.‘

According to Section 7.2.1 of the USB 2.0 Specification 1., 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.

VBUS_DET monitors the state of the upstream VBUS signal and will

not pull-up the D+ resistor if VBUS is not active. If VBUS goes from

an active to an inactive state (Not Powered), the hub will remove

power from the D+ pull-up resistor within 10 seconds.

DOWNSTREAM USB 2.0 INTERFACES

USBDP_DN1

USBDP_DN2

USBDM_DN1

USBDM_DN2

IO-U

Hi-Speed USB Data: connect to the downstream USB peripheral

devices attached to the hub’s ports.

PRTPWR1

PRTPWR2

I/O12

IPU

I-R

USB Power Enable: enables power to USB peripheral devices that are

downstream, where the hub supports active high power controllers

only.

OCS_N1

OCS_N2

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.

RBIAS

USB Transceiver Bias: a 12.0 kΩ (+/- 1%) resistor is attached from

ground to this pin to set the transceiver’s internal bias settings.

MISC

NON_REM1

I/O

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 and 11: ports 1 and 2 are non-removable

See Section 2.5, "Strap Option Pins" for details.

Revision 1.3 (12-27-11)

SMSC USB2412

DATA¹S⁰HEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Table 2.2 USB2412 Pin Descriptions (continued)

BUFFER

TYPE

SYMBOL

DESCRIPTION

SUSP_IND /

I/O

Active/Suspend Status LED (suspend indicator): indicates the USB

hub state. See Section 2.5, "Strap Option Pins" for details.

NON_REM0 = 0: SUSP_IND is active high

NON_REM0 = 1: SUSP_IND is active low

negated = unconfigured, or configured and in USB suspend

asserted = hub is configured and is active (i.e., not in suspend)

NON_REM0

Non-removable Port Strap Option: this pin is sampled (in conjunction

with NON_REM1) 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 and 11: ports 1 and 2 are non-removable

See Section 2.5, "Strap Option Pins" for details.

HS_IND

I/O12

Hi-Speed Upstream Port Indicator

Note:

An LED can be attached for visual indication. See Section

2.5, "Strap Option Pins" for details. When an LED is not used,

this pin requires a 50 kΩ or higher resistor to ground.

negated = the hub is connected at FS

asserted = the hub is connected at HS

XTALIN

CLKIN

ICLKx

24 MHz Crystal Input: this pin connects to either one terminal of the

crystal or to an external 24 MHz clock when a crystal is not used.

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.

XTALOUT

OCLKx

24 MHz Crystal Output: this is the other terminal of the crystal circuit

with 1.2 V p-p output and a weak (< 1mA) driving strength. When an

external clock source is used to drive XTALIN/CLKIN, leave this pin

unconnected, or use with appropriate caution.

TEST

IPD

Treat as a no connect pin or connect to ground. No trace or signal

should be routed or attached to this pin.

RESET_N

RESET Input: the system can reset the chip by driving this input low,

where the minimum active low pulse is 1 μs.

POWER, GROUND, and NO CONNECTS

CRFILT

VDD33

VDD Core Regulator Filter Capacitor: this pin can have up to 0.1 μF

low-ESR capacitor to VSS, or be left unconnected.

3.3 V Power

PLLFILT

TEST1

PLL Regulator Filter Capacitor: this pin can have up to 0.1 μF low-ESR

capacitor to VSS, or be left unconnected.

This pin must be connected to VSS.

SMSC USB2412

Revision 1.3 (12-27-11)

DATAS¹¹HEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Table 2.2 USB2412 Pin Descriptions (continued)

BUFFER

TYPE

SYMBOL

DESCRIPTION

ePAD

Ground Pad/ePad: this pin must be connected to VSS for the device

and must be tied to ground with multiple vias

No Connect: no signal or trace should be routed or attached to these

pins.

2.4

Buffer Type Descriptions

Table 2.3 Buffer Type Descriptions

BUFFER

DESCRIPTION

I/O

IPD

Input/Output

Input with internal weak pull-down resistor

Input with internal weak pull-up resistor

Input with Schmitt trigger

IPU

I/O12

ICLKx

OCLKx

I-R

Input/Output buffer with 12 mA sink and 12 mA source

XTAL clock input

XTAL clock output

RBIAS

I/O-U

Analog Input/Output defined in USB specification

2.5

Strap Option Pins

The NON_REM[1:0] strap option pins can be enabled using the internal default configuration. The

driver type of each strap pin is I/O (no internal pull-up or pull-down for the input function). Figure 2.2

shows an example of Strap High and Strap Low configurations, where Strap High sets the strap option

to a 1 and Strap Low sets the strap option value to 0. To use an external LED indicator, the options

outlined in Figure 2.3 should be implemented.

50 kΩ

Primary Function/

Strap High

Primary Function/

Strap Low

Strap Pin

HUB

Strap Pin

HUB

50 kΩ

GND

Figure 2.2 Non-Removable Pin Strap Example

Revision 1.3 (12-27-11)

SMSC USB2412

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2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

LED/

Strap High

kΩ

Strap Pin

HUB

Strap Pin

HUB

LED/

kΩ

Strap Low

Figure 2.3 LED Pin Strap Example

SMSC USB2412

Revision 1.3 (12-27-11)

DATA¹S³HEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Chapter 3 Internal Default Configuration

SMSC’s USB 2.0 hub is fully compliant with the USB Specification1.. Refer to Chapter 10 (Hub

Specification) for general details regarding hub operation and functionality.

The hub provides one Transaction Translator (TT) that is shared by both downstream ports (defined

as Single-TT configuration). The TT contains 4 non-periodic buffers.

3.1

Hub Configuration

The USB2412 only supports internal defaults with the exception of the non-removable strap option

(using NON_REM[1:0]). The hub internal default settings are as follows:

Internal Default Configuration without over-rides

Strap options enabled

Self-powered operation enabled

Individual power switching

Individual over-current sensing

3.2

Reset

There are two different resets that the hub experiences. One is a hardware reset via RESET_N and

the second is a USB Bus Reset.

3.2.1

External Hardware RESET_N

A valid hardware reset is defined as assertion of RESET_N for a minimum of 1 μs after all power

supplies are within operating range. While reset is asserted, the hub (and its associated external

circuitry) consumes less than 500 μA of current from the upstream USB power source.

Assertion of RESET_N causes the following:

1. All downstream ports are disabled, 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, 00h).

5. The external crystal oscillator is halted.

6. The PLL is halted.

7. The hub is “operational” 500 μs after RESET_N is negated.

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3.2.1.1

RESET_N

Hardware

reset asserted

Read

NON_REM[1:0]

Outputs to

inactive levels Upstream

USB

USB Reset

recovery

Start completion

request response

Idle

RESET_N

VSS

NON_REM[1:0]

Don’t Care

Valid

Driven by Hub if strap is an output

Don’t Care

VSS

Figure 3.1 Reset_N Timing

Table 3.1 Reset_N Timing

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N asserted

μsec

nsec

μsec

msec

Strap setup time

16.7

Strap hold time

1400

Hub outputs driven to inactive logic states

USB attach (See Note)

Host acknowledges attach and signals USB reset

USB idle

1.5

100

undefined

Completion time for requests (with or without data

stage)

Note: All power supplies must have reached the operating levels mandated in Chapter 4, DC

Parameters, prior to (or coincident with) the assertion of RESET_N.

3.2.2

USB Bus Reset

In response to the upstream port signaling a reset to the hub, the hub does the following:

1. Sets default address to 0.

2. Sets configuration to unconfigured.

3. Negates PRTPWR[2:1] 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 specification.

Note: The hub does not propagate the upstream USB reset to downstream devices.

SMSC USB2412

Revision 1.3 (12-27-11)

DATA¹S⁵HEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Chapter 4 DC Parameters

4.1

Maximum Guaranteed Ratings

PARAMETER

SYMBOL

MIN

MAX

UNITS

Storage Temperature

Lead Temperature

3.3 V supply voltage

T_STOR

-55

150

°C

VDD33

PLLFILT

CRFILT

4.6

Voltage on any I/O pin

Voltage on XTALIN

-0.5

5.5

4.0

2.5

Voltage on XTALOUT

Note 4.1 Refer to JEDEC Specification J-STD-020D 5..

Note 4.2 Stresses above the specified parameters could cause permanent damage to the device.

This is a stress rating only and functional operation of the device at any condition above

those indicated in the operation sections of this specification is not implied.

Note 4.3 When powering this device from laboratory or system power supplies, it is important that

the absolute maximum ratings not be exceeded or device failure can result. Some power

supplies exhibit voltage spikes on their outputs when the AC power is switched on or off.

In addition, voltage transients on the AC power line may appear on the DC output. When

this possibility exists, it is suggested that a clamp circuit be used.

4.2

Operating Conditions

PARAMETER

SYMBOL

MIN

MAX

UNITS

COMMENTS

Operating

Temperature

T_A

°C

Ambient temperature in still air.

VDD33

t_RT

3.3 V supply voltage

3.0

3.6

3.3 V supply rise

time

400

μs

See Figure 4.1

Voltage on any I/O

-0.3

5.5

If any 3.3 V supply voltage drops

below 3.0 V, then the MAX becomes:

(3.3 V supply voltage) + 0.5

VDD33

Voltage on XTALIN

-0.3

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Datasheet

Voltage

VDD33

t_RT

3.3 V

100%

90%

10%

VSS

t_90%

Time

t_10%

Figure 4.1 Supply Rise Time Model

Table 4.1 DC Electrical Characteristics

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

COMMENTS

I, IS Type Input Buffer

Low Input Level

V_ILI

V_IHI

I_IL

0.8

TTL Levels

High Input Level

2.0

-10

250

Input Leakage

+10

350

μA

V_IN= 0 to VDD33

Hysteresis (‘IS’ Only)

Input Buffer with Pull-Up (IPU)

Low Input Level

V_HYSI

V_ILI

V_IHI

I_ILL

0.8

TTL Levels

High Input Level

2.0

+35

-10

Low Input Leakage

High Input Leakage

+90

+10

μA

V_IN= 0

I_IHL

V_IN= VDD33

Input Buffer with Pull-Down (IPD)

Low Input Level

V_ILI

V_IHI

I_ILL

0.8

TTL Levels

High Input Level

2.0

+10

-35

Low Input Leakage

-10

-90

μA

V_IN= 0

High Input Leakage

I_IHL

V_IN= VDD33

ICLK Input Buffer

Low Input Level

High Input Level

Input Leakage

V_ILCK

V_IHCK

I_IL

0.5

1.4

-10

+10

μA

V_IN= 0 to VDD33

SMSC USB2412

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2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Table 4.1 DC Electrical Characteristics (continued)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

COMMENTS

O12, I/O12 &I/OSD12 Type Buffer

Low Output Level

V_OL

V_OH

0.4

I_OL= 12 mA @ VDD33

= 3.3 V

High Output Level

2.4

-10

250

Output Leakage

I_OH= -12 mA @ VDD33

= 3.3 V

I_OL

+10

350

μA

Hysteresis (‘SD’ pad only)

V_HYSC

V_IN= 0 to VDD33

(Note 4.1)

Supply Current Unconfigured

Hi-Speed Host

I_CCINTHS

I_CCINTFS

I_HCH1

Supply Current Unconfigured

Full-Speed Host

Supply Current Configured

Hi-Speed Host, 1 downstream port

1 port

base

1 port

base

Supply Current Configured

Hi-Speed Host, each additional

downstream port

25 mA

Supply Current Configured

Full-Speed Host, 1 downstream port

I_FCC1

There is no additional

current for additional

ports.

1 port

base

1 port

base

Supply Current Configured

Full-Speed Host, each additional

downstream port

8 mA

Supply Current Suspend

Supply Current Reset

I_CSBY

I_CRST

475

550

1000

1100

μA

All supplies combined

Note 4.4 Output leakage is measured with the current pins in high impedance.

Note 4.5 See USB 2.0 Specification 1. for USB DC electrical characteristics.

Revision 1.3 (12-27-11)

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Datasheet

4.2.1

Pin Capacitance

Table 4.2 Pin Capacitance

LIMITS

PARAMETER

SYMBOL

MIN

TYP MAX UNIT

TEST CONDITION

Clock Input

Capacitance

C_XTAL

All pins except USB pins and the pins

under the test tied to AC ground.

Input Capacitance

C_IN

Capacitance T_A= 25°C

fc = 1 MHz

VDD33 = 3.3 V

Output Capacitance

C_OUT

The maximum capacitance values

include the full length of the pin pad. See

the Y dimension in Figure 6.2.

4.2.2

Package Thermal Specifications

Thermal parameters are measured or estimated for devices with the exposed pad soldered to thermal

vias in a multilayer 2S2P PCB per JESD51. Thermal resistance is measured from the die to the

ambient air.

Table 4.3 28-Pin QFN Package Thermal Parameters

VELOCITY

(meters/sec)

PARAMETER

SYMBOL

VALUE

UNIT

Thermal Resistance

40.3

35.2

0.5

Θ_JA

°C/W

Junction-to-Top-of-Package

Ψ_JT

°C/W

0.6

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Datasheet

Chapter 5 AC Specifications

5.1

Oscillator/Crystal

Parallel Resonant, Fundamental Mode, 24 MHz ± 350 ppm.

XTALIN

(C_{S1 =}C_B1+ C_XTAL1

)

C₁

1 M

Crystal

C_L

C₀

C₂

XTALOUT

(C_{S2 =}C_B2+ C_XTAL2

)

Figure 5.1 Typical Crystal Circuit

Table 5.1 Crystal Circuit Legend

SYMBOL

DESCRIPTION

IN ACCORDANCE WITH

C₀

Crystal shunt capacitance

Crystal load capacitance

Total board or trace capacitance

Stray capacitance

Crystal manufacturer’s specification (See Note 5.1)

C_L

C_B

OEM board design

SMSC IC and OEM board design

SMSC IC

C_S

C_XTAL

C₁

XTAL pin input capacitance

Load capacitors installed on OEM

board

Calculated values based on Figure 5.2, "Formula to Find the

Value of C1 and C2" (See Note 5.2)

C₂

C₁= 2 x (C_L– C₀) – C_S1

C₂= 2 x (C_L– C₀) – C_S2

Figure 5.2 Formula to Find the Value of C₁and C₂

Note 5.1 C₀is usually included (subtracted by the crystal manufacturer) in the specification for C_L

and should be set to 0 for use in the calculation of the capacitance formulas in Figure 5.2,

"Formula to Find the Value of C1 and C2". However, the PCB itself may present a parasitic

capacitance between XTALIN and XTALOUT. For an accurate calculation of C₁and C_2,

take the parasitic capacitance between traces XTALIN and XTALOUT into account.

Note 5.2 Each of these capacitance values is typically approximately 18 pF.

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Datasheet

5.2

External Clock

50% Duty cycle ± 10%, 24 MHz ± 350 ppm, Jitter < 100 ps rms.

The external clock is recommended to conform to the signaling level designated in the JESD76-2

specification on 1.2 V CMOS Logic. XTALOUT should be treated as a no connect.

5.2.1

USB 2.0

The SMSC hub conforms to all voltage, power, and timing characteristics and specifications as set

forth in the USB 2.0 Specification 1. See the USB Specification for more information.

SMSC USB2412

Revision 1.3 (12-27-11)

DATA²S¹HEET

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Datasheet

Chapter 6 Package Outline

Figure 6.1 USB2412 28-Pin QFN Package Outline (5x5 mm Body, 0.5 Pitch, 3.1 ePad)

Table 6.1 Package Parameters

MIN

NOMINAL

MAX

NOTE

REMARKS

0.80

0.85

0.02

1.00

0.05

0.80

5.10

4.95

3.20

0.50

0.30

Overall Package Height

Standoff

0.60

4.90

4.55

3.00

0.30

0.18

0.45

Mold Cap Thickness

X/Y Overall Body Size

X/Y Mold Cap Size

X/Y Exposed Pad Size

Terminal Length

D/E

D1/E1

D2/E2

5.00

4.75

3.10

0.40

0.25

0.55

0.50 BSC

Terminal Width

Terminal to ePad Clearance

Terminal Pitch

Notes:

1. All dimensions are in millimeters.

2. Position tolerance of each terminal and exposed pad is ±0.05 mm at maximum material condition. Instances of dimension “b”

apply to plated terminals and is measured between 0.15 and 0.33 mm from the terminal tip.

3. Details of terminal #1 identifier are optional. However, they must be located within the area indicated.

4. Coplanarity zone applies to exposed pad and terminals.

Revision 1.3 (12-27-11)

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Datasheet

Figure 6.2 Recommended Printed Circuit Board (PCB) Land Pattern

SMSC USB2412

Revision 1.3 (12-27-11)

DATA²S³HEET

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Datasheet

6.1

Tape and Reel Specification

Figure 6.3 28-Pin Package Tape Dimensions and Part Orientation (mm)

Figure 6.4 28-Pin Package Tape Length and Part Quantity

Revision 1.3 (12-27-11)

SMSC USB2412

DATA²S⁴HEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Figure 6.5 Package Reel Specifications

SMSC USB2412

Revision 1.3 (12-27-11)

DATA²S⁵HEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Appendix A (Acronyms)

I²C^®:

OCS:

PCB:

PHY:

PLL:

QFN:

RoHS:

SCL:

SIE:

Inter-Integrated Circuit¹

Over-Current Sense

Printed Circuit Board

Physical Layer

Phase-Locked Loop

Quad Flat No Leads

Restriction of Hazardous Substances Directive

Serial Clock

Serial Interface Engine

System Management Bus

Transaction Translator

SMBus:

TT:

1.I²C is a registered trademark of Philips Corporation.

Revision 1.3 (12-27-11)

SMSC USB2412

DATA²S⁶HEET

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Appendix B References

1. Universal Serial Bus Specification, Version 2.0, April 27, 2000 (12/7/2000 and 5/28/2002 Errata)

USB Implementers Forum, Inc. http://www.usb.org

2. I²C-Bus Specification Version 1.1

NXP (formerly a division of Philips). http://www.nxp.com

3. System Management Bus Specification, version 1.0

SMBus. http://smbus.org/specs/

4. MicroChip 24AA02/24LC02B (Revision C)

Microchip Technology Inc. http://www.microchip.com/

5. JEDEC Specifications: JESD76-2 (June 2001) and J-STD-020D.1 (March 2008)

JEDEC Global Standards for the Microelectronics Industry.

http://www.jedec.org/standards-documents

SMSC USB2412

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USB2412-DZK产品参数

型号:	USB2412-DZK
是否Rohs认证：	符合
生命周期：	Active
零件包装代码：	QFN
包装说明：	HVQCCN, LCC28,.2SQ,20
针数：	28
Reach Compliance Code：	compliant
HTS代码：	8542.31.00.01
Factory Lead Time：	4 weeks
风险等级：	1.02
地址总线宽度：
最大时钟频率：	24 MHz
外部数据总线宽度：
JESD-30 代码：	S-XQCC-N28
JESD-609代码：	e3
长度：	5 mm
端子数量：	28
最高工作温度：	70 °C
最低工作温度：
封装主体材料：	UNSPECIFIED
封装代码：	HVQCCN
封装等效代码：	LCC28,.2SQ,20
封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	3.3 V
认证状态：	Not Qualified
座面最大高度：	1 mm
子类别：	Bus Controllers
最大压摆率：	65 mA
最大供电电压：	3.6 V
最小供电电压：	3 V
标称供电电压：	3.3 V
表面贴装：	YES
技术：	CMOS
温度等级：	COMMERCIAL
端子面层：	Matte Tin (Sn) - annealed
端子形式：	NO LEAD
端子节距：	0.5 mm
端子位置：	QUAD
处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	5 mm
uPs/uCs/外围集成电路类型：	BUS CONTROLLER, UNIVERSAL SERIAL BUS
Base Number Matches：	1

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