Microchip EVB-USB3343 Manual


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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.


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: EVB-USB3343

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