Microchip Technology SMSC USB3503 Manual de usuario

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SMSC USB3503 EVB Revision 1.0 (05-06-13)

USER MANUAL

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

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

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

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

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

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

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

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

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

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

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

The Microchip name and logo, and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

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

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

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

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

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

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

USB3503 Evaluation Board User Manual

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USER MANUAL

1 Introduction

This user manual is for the USB3503 Evaluation board. This board can be used to test and evaluate

the functionality of the USB3503 and is ideal for early system integration and software development.

The USB3503 EVB provides access to the HSIC upstream and USB downstream ports, as well as the

I2C communication pins.

SMSC also has evaluation software that can be used with the USB3503 EVB connected to a Total

Phase Aardvark adaptor. This software allows the user to configure the USB3503 in different ways

before enumeration as well as monitor and manipulate select status registers during enumeration. The

software can be used to prototype microprocessor software, evaluate the different configurations, and

test how the desired configuration fits into the entire system.

2 Operation

2.1 Contents of the Kit

The USB3503 EVB includes the basic equipment necessary to evaluate the USB3503. The items

included in the kit are:

1. USB3503 EVB

2. 5V DC Power Supply

3. Documentation and Software CD

The kit does not include any downstream USB devices, I2C master hardware, or other components

for board customization.

2.2 Initial Bring Up

The USB3503 EVB has a default configuration that allows it to operate as a stand alone hub. To begin,

connect the U.FL connectors to the HSIC host. Then, plug the evaluation board into the 5V power

supply. The USB3503 EVB will enumerate as a Generic USB Hub, with the VID and PID equal to the

default values found in the USB3503 Datasheet.

The default configuration of the USB3503 is to enumerate as a Self Powered Hub. This means that,

according to the USB 2.0 specification, the downstream ports are only allowed to provide 500mA of

current to the downsteam device.

Refer to the next chapters to see the customization options associated with the evaluation kit.

3 Hardware

The USB3503 EVB is a board that demonstrates the capabilities of the USB3503. The board consists

of the HSIC upstream and USB downstream ports, a INT_N LED for visual confirmation of the

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interrupts configured, a header exposing the I2C pins, and additional circuitry that is used for I2C

communication.

3.1 HSIC and USB Ports

The downstream USB ports are mounted on the edges of the USB3503 EVB. The downstream ports

use the standard USB Type A receptacle. The label for the port is located near the receptacle. The

HSIC upstream port uses U.FL connectors for Data and Strobe.

Figure 3.1 Block Diagram of the USB3503 EVB

Figure 3.2 Upstream and Downstream Ports

USB3503

Upstream

HSIC

Downstream

USB

Downstream

USB

Downstream

USB

Digital IO

LED

J2: Data

Downstream3 Downstream2 Downstream1

J3: Strobe

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3.2 Test Points, Switches and LEDs

There are multiple test points to confirm that the USB3503 EVB is powered properly. TP1 and TP6

connect to GND, TP2 connects to the VBAT pin, and TP3 connects to the VDD_CORE_REG pin.

The USB3503 EVB also has three switches to manually control the RESET_N and HUB_CONNECT

inputs to the part. Figure 3.3 shows the location of the test points (Red) and switches (Yellow).

The USB3503 SCL, SDA, RESET_N, HUB_CONNECT and INT_B pins are also exposed on the J1

header. These pins are compatible with the Total Phase Aardvark pinout, where pin 1 of the Aardvark

connector connects to pin 1 of header J1 (Refer to Figure 4.1 for the proper way to connect the

Aardvark). The INT_N pin is also connected to LED1 to indicate that an interrupt has occurred. The

LED remains lit until the interrupt is cleared, as described in the USB3503 datasheet.

3.3 Configuration Resistors

There are eight different resistors used to configure the part when the RESET_N pin transitions from

Low (0V) to High(>1.25V). These resistors are used for the REF_SEL pins. Because these resistors

and pads pull up to the 1.8V regulator, any changes to these resistors will need to be done with the

board unpowered. The resistor pads are laid out in a manner that prevents the pull-up resistors from

being populated at the same time as the pull-down resistors, as shown in Figure 3.4. The following

tables show the proper configuration resistor population requirements for the desired results, the

resistor values should match those found in Section 6, "USB3503 EVB Bill of Materials".

Figure 3.3 Test points, Switches, Header and LED

TP2

TP1

J 1

Pin1

LED1

HUB_CONNECT

RESET TP3

TP6

NOT USED

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Note: The Y1 Oscillator will need to be replaced with the proper frequency if the REF_SEL pins are

altered. Refer to Section 6, "USB3503 EVB Bill of Materials" for recommended oscillator

specifications.

3.4 Additional Circuitry

The U1 Regulator provides 3.3V to the VBAT pin, and also supplies power to the 26MHz clock

oscillator. If a higher VBAT voltage is desired, remove R1 and supply the power through TP2.

The U2 Regulator provides 1.8V to the VDD_CORE_REG pin as well as providing the pull up voltage

for the digital control pins. To provide external power to the VDD_CORE_REG pin remove R8 and

supply the power through TP3.

The USB3503 can function with a single power supply; to do this remove R8 and place a 0Ohm

resistor on R9. This connects the VDD_CORE_REG pin to the VDD33_BYP pin allowing the

USB3503’s internal 3.3V regulator to supply the VDD_CORE_REG voltage.

Table 3.1 REF_SEL Options

R18R21R27R30 REFCLK(MHZ)

EMPTY EMPTY INSTALL INSTALL 38.4

EMPTY INSTALL INSTALL EMPTY 26.0 (Default)

INSTALL EMPTY EMPTY INSTALL 19.2

INSTALL INSTALL EMPTY EMPTY 12.0

Figure 3.4 Configuration Resistors

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Below is a summary of the different power options and what resistors need to be populated to support

these options:

Table 3.2 VBAT and VDD_CORE_REG Source Control

R1 R8 R9 VBAT SOURCE VDD_CORE_REG SOURCE

INSTALL INSTALL EMPTY Onboard Regulator Onboard Regulator

EMPTY INSTALL EMPTY External (TP2) Onboard Regulator

EMPTY EMPTY EMPTY External (TP2) External (TP3)

INSTALL EMPTY INSTALL Onboard Regulator VDD33_BYP

EMPTY EMPTY INSTALL External (TP2) VDD33_BYP

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Below are the locations of the resistors on the back side of the board:

Figure 3.5 Regulator Resistors

R35

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4 Software

The USB3503 EVB comes with a CD that contains evaluation software that can be used with the Total

Phase Aardvark USB-I2C adaptor (not included with the Evaluation Kit). To install the software, run

Setup.exe, found on the CD. This will install the USB3503 Evaluation Software, the LabVIEW Run-

time engine (to run the executable), and the Total Phase drivers to communicate with the Aardvark.

Once the software has been installed, locate and run the USB3503 Evaluation.exe program on the

computer. Connect the Aardvark to the USB3503 EVB with the red wire facing the power port, as in

Figure 4.1.

Figure 4.1 Aardvark Connection

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The software allows the user to control the digital input pins RESET_N and CONNECT. It also can

monitor the INT_N pin for interrupts. There is a section to communicate with the I2C serial port, as well

as some quick configuration and customization options.

4.1 Digital Control

The RESET_N and HUB_CONNECT pins can be controlled in real time with the Digital Control array.

Each button in the array corresponds to the pin with the matching name. When the button is orange,

the pin is at logic level High. When the button is black the voltage is a logic level Low. Refer to the

green box in Figure 4.3 for the digital control array location.

Set the RESET_N pin low to reset the part and place it into the lowest power state. If the CONNECT

pin is low when the RESET pin transitions from low to high, the USB3503 will remain in a state that

allows the serial interface registers to be manipulated. To enumerate the hub, either write 00h to

Once the USB3503 has enumerated, the serial interface registers should not be modified.

Figure 4.2 USB3503 Evaluation Screen

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Notes: To prevent the Aardvark from driving against another voltage, the Aardvark is running in an

Open/Drain mode, therefore it is important that all switches on the board pull the pins up to

the Vcc value.

4.2 I2C Communication

The application also contains a general I2C register read/write section. The Bit and Description

display the serial interface register descriptions found in the USB3503 datasheet. The Register display

can be used to select the proper serial interface register to manipulate. Click on the Value or Bit box

above to change the value of the register. Once the desired value and register are selected, press the

Write button to change the value on the part. Click on the Read button and the Value and Bit boxes

will update the current value on the part. Refer to the USB3503 datasheet for a detailed description of

each register and operation of the device

4.3 Quick Configuration and Customization

The USB3503 Evaluation program also contains some quick configuration and customization options

that automatically update the registers to match the desired configuration. The USB3503 can

enumerate as a Self Powered or Bus Powered Hub with 1, 2 or 3 downstream ports. The VID, PID,

DID and enumeration strings can also be customized to allow the USB3503 to enumerate with

whatever identification is desired.

Figure 4.3 Digital Control (Green) and I2C (Yellow) Sections

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