Instrukcja obsługi Microchip USB2503A

Microchip Niesklasyfikowane USB2503A

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SMSC EVB-USB2503 Revision A3 (06-01-07)
Copyright © 2007 SMSC or its subsidiaries. All rights reserved.
The information contained herein is proprietary to SMSC and shall be used solely in accordance with the agreement pursuant to which
it is provided. Although the information is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the
right to make changes to this document and to specifications and product descriptions at any time without notice. Neither the provision
of this information nor the sale of the described semiconductor devices conveys any licenses under any patent rights or other intellectual
property rights of SMSC or others unless specifically specified otherwise. The product may contain design defects or errors known as
anomalies, including but not necessarily limited to any which may be identified in this document, which may cause the product to deviate
from published specifications. 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 will be fully at the risk of the customer. SMSC is a registered trademark of Standard
Microsystems Corporation ("SMSC").
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 REV-ENUES 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-USB2503 Evaluation Board
EVB-USB2503 Evaluation Board
Revision A3 (06-01-07) SMSC EVB-USB2503
2
1 Overview
1.1 Features
Operates from a single voltage (+5.0V, regulated) wall wart external power supply or bus-powered
from upstream VBUS
Onboard +3.3V Regulator (Option A linear, Option B switching regulator)
Self-powered or bus-powered operation dynamically switched
Serial EEPROM for configuration information mounted in a socket
Optional pull-up resistors for disabling individual downstream ports
Green LED indicators
Individual port over-current sense and power switching
Multi-TT enabled
High-speed/Full-speed capable
100mS down stream port power on time
PCB - 2.6” X 3.5”, 4-layers
1.2 General Description
The primary purpose of this board is to demonstrate a full-featured HUB configuration for the SMSC
USB2503 3-port HUB. This does not represent a minimal cost design. A view of the silk screen is
shown in figure 1. The EEPROM allows for modifications to the base configuration - for example one
or more down stream ports can be disabled or configured as non-removable for compound device
application. The DID, PID or DID information can be changed for the HUB.
EVB-USB2503 Evaluation Board
SMSC EVB-USB2503 Revision A3 (06-01-07)
3
2 Hardware Functionality
2.1 Dynamic Power Switching
The EVB-USB2503 supports dynamic switching of power. This feature allows a hub to operate as self-
powered when external power is available or bus-powered when external power is not available. The
USB2503 will reconfigure when it detects pin SELF_PWR changing. For more details on dynamic
power switching feature please refer to the data sheet for the USB2503.
2.1.1 Regulator Options
The EVB-USB2503 supports two different 3.3V regulator solutions A and B. Option A uses a standard
LDO regulator. For true USB-IF certifiable bus power operation the total power budget exceeds the
maximum allowed. However, option B uses a switching regulator with approximately 90% efficiency.
This regulator also has a low suspend current feature. The power budget is shown in the table below
for different operating conditions. The hub controller current is the maximum current when all three
down stream ports are operating.
NOTE:
For reference revision A3 of the schematic in included and is recommended for new designs. The EVB-
USB2503 is shipping as revision A2 and does not incorporate the changes from A2 to A3.
2.1.2 Power Budget
Table 1 Power Budget
HUB
CONTROLLER
DOWNSTREAM
PORTS TOTAL
SELF POWERED
Linear Regulator, Option A 250 mA 1500 mA 1750 mA
Switching regulator, Option B 170 mA 1500 mA 1670 mA
Bus Powered
Linear regulator, Option A 250 mA 300 mA 550 mA
(Note this exceeds USB-IF specification
for bus-powered devices, which is 500 mA
maximum)
Switching regulator, Option B 170 mA 300 mA 470 mA
Suspend
Linear regulator, Option A 1.2 mA 1.5 mA 2.7 mA
Switched regulator, Option B 0.9 mA 1.5 mA 2.4 mA

Specyfikacje produktu

Marka: Microchip
Kategoria: Niesklasyfikowane
Model: USB2503A

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