Microchip EVB-USB3343 Handleiding

Microchip Niet gecategoriseerd EVB-USB3343

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SMSC EVB-USB3343 SMSC CONFIDENTIAL - USER MANUAL Revision 1.0 (05-06-13)
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EVB-USB3343 USB Transceiver
Evaluation Board User Manual
EVB-USB3343 USB Transceiver Evaluation Board User Manual
Revision 1.0 (05-06-13) 2 SMSC EVB-USB3343
SMSC CONFIDENTIAL - USER MANUAL
1 Introduction
This user manual is for the USB3343 USB Transceiver Evaluation Board (EVB) for use with the
USB3343 products with support for variable I/O voltage levels and 26MHz crystal operation.
The USB3343 features a ULPI interface to support systems with USB Host, Device, or On-the-Go
(OTG) capability.
2 Overview
The EVB-USB3343 is a Daughter Card designed to plug into a user's test system using a T&MT
connector. The card attaches to a USB link layer to create a USB Host, Device, or On-the-Go (OTG)
system. The board edge connector meets the UTMI+ Low Pin Interface (ULPI) Standard requirements
for the T&MT connector.
A link to the ULPI Working Group Page is available at www.smsc.com or may be obtained from your
local FAE. The EVB-USB3343 includes USB3343 packaged silicon and all external components
required for the USB transceiver function.
This manual describes PCB assembly PCB-7202AZ.
2.1 Supplying VBUS Voltage
In Host or OTG operation, the EVB-USB3343 must provide 5 Volts on V
BUS at the USB connector. The
EVB-USB3343 includes a switch that can drive VBUS using the 5 Volt supply that comes from pin 28
of the T&MT connector.
The VBUS switch is controlled by the DRVVBUS signal driven from the Link (T&MT connector). The
5 Volt switch is backdrive protected when in the off state. The switch does not provide protection from
reverse currents when it is on. See Section 2.9 and Section 2.10 for more information on configuring
the EVB-USB3343 for OTG and Host operation.
2.2 ULPI I/O Voltage
The USB3343 supports variable ULPI I/O voltage signaling. The ULPI I/O voltage is supplied in one
of two ways. By default, the EVB is shipped with VDDIO supplied by the on-board LDO.
Resistor R11 is used to set VDDIO, the digital logic high voltage. To change the value of VDDIO,
calculate a new value for R27 (ohms) as follows.
R11 = (VDDIO/1.225-1) x 169000
VDDIO must be in the range of 1.8 Volts - 3.3 Volts nominal.
VDDIO can also be supplied to the USB3343 from the T&MT connector instead of using the LDO. To
do this, the LDO (U10) must be removed.
The VDDIO voltage level that has been configured on the EVB-USB3343 must be the same as the
ULPI I/O voltage level that the link is using.
EVB-USB3343 USB Transceiver Evaluation Board User Manual
SMSC EVB-USB3343 3 Revision 1.0 (05-06-13)
SMSC CONFIDENTIAL - USER MANUAL
2.3 Edge Connector for Digital I/O
The T&MT edge connector is compliant to the ULPI specification. Part numbers and manufacturers for
this connector and it’s mate are given in Table 2.1.
2.4 REFCLK Frequency Selection
The EVB-USB3343 is by default configured for operation with a 26MHz crystal (Y1). The EVB also
accomodates the use of a 26MHz oscillator (X1). To use a 26MHz oscillator, X1, U6, and R4 must be
populated, and Y1, R30, and C22 must be removed.
2.5 USB Connector
A standard Mini-AB connector is provided to attach a USB cable or connector. Provision is made on
the PCB to accept a Micro-AB connector. See the bill of materials in Section 6 for connector part
numbers. Do not substitute a different part number for the Mini-AB receptacle or a short circuit of the
USB signals may result at the micro-AB connector PCB footprint.
2.6 VBUS Present Detection
The USB controller must detect VBUS when a USB cable is attached in device mode or when the USB
controller turns on VBUS in host or OTG mode. The USB connector VBUS signal is connected to the
VBUS pin of the USB3343. The USB3343 includes all of the comparators required to detect VBUS and
report the state of VBUS to the USB controller via the ULPI bus.
2.7 ULPI Signal Test Points
Probe points at location J2, provide access to all ULPI signals. Install the Tektronix logic analyzer probe
retention kit at J2 to probe these signals. Ordering information for the retention kit is provided in the
bill of materials.
2.8 Other Signal Test Points
There are five other test points located on the board for easy access. TP1 connects to the 5V supply
coming from the T&MT connector. TP2 connects to the 3.3V VDD supply coming from the T&MT
connector. TP3 connects to Ground.
2.9 Converting the EVB to an OTG System
“Out of the box”, the EVB-USB3343 is delivered as a USB Device system. To convert it to be a USB
OTG development board, the following modifications must be made:
1. Install R13 (zero ohm resistor). This connects the VBUS 5V switch to the VBUS signal.
Table 2.1 Edge Connector on the EVB-USB3343
PART NUMBER DESCRIPTION MANUFACTURER
2-557101-5 100 pin edge connector on EVB-USB3343 AMP
2-557-101-5 Mating connector to the EVB-USB3343 AMP
1-1734037-0 Alternate 100 pin edge connector for EVB-USB3343 TYCO
1-1734099-0 Alternate mating connector to the EVB-USB3343 TYCO

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: EVB-USB3343

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