Microchip USB2251 Handleiding

Microchip Niet gecategoriseerd USB2251

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SMSC EVB-USB2250 USER MANUAL Revision 0.3 (03-06-09)
Copyright © 2009 SMSC or its subsidiaries. All rights reserved.
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.
EVB-USB2250 User Manual Revision B
EVB-USB2250 User Manual Revision B
Revision 0.3 (03-06-09) 2 SMSC EVB-USB2250
USER MANUAL
1 Overview
The SMSC EVB-USB2250 is an Ultra Fast USB 2.0 Multi-Slot Flash Media Controller with CF, SD,
MS, and xD connectors. The EVB-USB2250 Evaluation Board demonstrates a standalone Hi-Speed
Mass Storage Class Peripheral Controller intended for reading and writing to more than 24 popular
flash media formats from the Compact FlashTM (CF), SmartMediaTM (SM), xD Picture CardTM (xD),
Memory Stick® (MS), Secure Digital (SD), and MultiMediaCardTM (MMC) families.
1.1 Features
îš„Operates either USB bus-powered or from a single voltage (+5.0 Volts, regulated) 'wall wart'
external power supply.
îš„Supports these media types:
- Compact FlashTM 4.1
- MultiMediaCardTM 2.0 / 4.2
- xD Picture CardTM
- Smart MediaTM 1.2 / 1.3
- Secure Digital (SD2.0, HS-SD, HC-SD)
- Memory Stick® 1.43
- Hi-Speed Memory StickTM
- Memory Stick Pro-HGTM
- Memory Stick Duo Memory Stick ProTM
îš„Simultaneous access for up to four memory devices
îš„Flash memory socket for external firmware
îš„Single onboard +3.3 Volt regulator
îš„Internal individual FET power switch for each media socket
îš„Single 24 MHz crystal clock source
îš„Media activity LED
îš„RoHS compliant
îš„Optional serial EEPROM for customized configuration
îš„Optional ESD and EMI footprints are provided
1.2 General Description
The EVB-USB2250 is a platform fe a Controller. The EVB-USB2250aturing the USB2250 Flash Medi
connects to a USB 2.0 port (J1), and optionally to a 5.0 Volt external supply (JP2: 2.1mm, tip -- POS).
The platform provides four media sockets supporting 24 different media formats. This platform
demonstrates a small footprint, low-cost implementation of the USB2250 with a rich feature set. The
platform features a socket for an onboard EEPROM for configuration and serial number data. The
platform also features a socket for a flash memory for external firmware. The schematic for the EVB-
USB2250 indicates the components that are required for each programming and configuration option.
EVB-USB2250 User Manual Revision B
SMSC EVB-USB2250 3 Revision 0.3 (03-06-09)
USER MANUAL
2 Hardware Configuration
2.1 Hardware Description
The EVB-USB2250 has one onboard regulator which generates 3.3 Volts from the 5 Volt power supply.
The USB2250 generates its own on-chip 1.8 Volt supply. The USB2250 Flash Media Controller
consumes power from the 3.3 Volt supply and supplies voltage to all four media connectors. The EVB-
USB2250 also supports an optional flash memory for external firmware or an optional serial EEPROM
for customized configuration.
2.1.1 External Serial EEPROM
The EVB-USB2250 has a socket (U4) for an optional I
2C EEPROM. This option provides custom
configuration of the USB2250. USBDM. Please visit http://www.smsc.com/main/catalog/usb225x.html
to locate the USBDM available in the software release package. Scroll down to the bottom of the page
and select “OBJ Hub Card Reader”. Then, read and accept the SMSC Software Download Agreement.
If you select “Confirm”, then you will be taken to the USB225x release package zip file where you can
download the tool set. The EVB-USB2250 is compatible with I
2C EEPROMs, 256 bytes or larger from
several manufacturers in 8-pin DIP packages.
2.1.2 External Flash Memory
The EVB-USB2250 has a socket (U3) for optional flash memory. The flash memory stores external
firmware that the USB2250 executes and can be updated in the field. The firmware can be uploaded
from the USBDM utility. Most 8-bit wide flash memory that is 128 kilobytes or larger in a 32-pin PLCC
package with access time of 70 ns or less are compatible with the EVB-USB2250.
2.1.3 Connector Description
The EVB-USB2250 has a standard set of media storage style connectors, which supports up to 24
popular flash media formats from the CompactFlashTM (CF), SmartMediaTM (SM), xD Picture CardTM
(xD), Memory Stick® (MS), Secure Digital (SD), and MultimediaCardTM (MMC) families.
2.1.4 Power Supply
The EVB-USB2250 receives power from either the host via the upstream connector J1 or from J8
depending upon JP1 shunt installation. For host power shunt pins 2 and 3, or for self-powered
operation shunt pins 1 and 2 of JP1.
2.1.5 Layout Considerations
The EVB-USB2250 is designed on four PCB layers--two signal layers and two supply layers. The PCB
layer stack is shown in Table 1. All signals are routed on the top and bottom layers. Internal layers are
ground and power.
Table 2.1 Connector Descriptions
CONNECTOR TYPE
J2 SD/MMC4.0
J6 XD
J7 MS Normal Mount
J9 Compact Flash

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: USB2251

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