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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 no t necessarily given. Although the informati on 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 c onditional 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 orde r (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 pub lished specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life suppor t 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 app roval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the custom er. Copies of this document or other SMSC literature, as wel l 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-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board, Revision C User Manual
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board, Revision C User Manual USER MANUAL
1 Overview
The SMSC USB2514 MultiTRAK™ is a Low-Power, full featured Hi-Speed USB 2.0 compliant hub with four down-stream ports. The EVB-USB2514Q36-BAS Evaluation Board demonstrates a stand alone application for the hub with all the features listed below and demonstrates the advanced power saving options and configurable port assignments. Two othe r versions of the evaluation board are available using the same printed circuit board (PCB) populate d with either the USB2512, 2-port hub or the USB2513, 3-port hub with pa rt numbers EVB-USB2512Q36- BAS and EVB-USB251 3Q36-BAS. The PCB is labeled EVB-USB2514BCQFN36, Revi sion A for all assembly versions.
1.1 Features
Low pin count USB2514 36 - pin QFN package - USB2512: 2-port version - USB2513: 3-port version Hi-Speed (480 Mbits/s), Full-Speed (12 Mbits/ s), and Low-Speed (1.5 Mbits/s) compatible. Operates from a single voltage (+5.0 VDC, regulated) 'wall wart' external power supply. Low cost 4-layer design: two outer signal layers - power inner layers - ground inner layers Optional pull-up resistors for disabling individual downstream ports. Self-powered operation. Multi-transaction translator enabled. Supports internal default hub configuration. Single onboard +3.3 VDC regulator. A footprint is provided for alternate regu lator for industrial temperature operation. Single crystal clock source. Individual port over-current sensing. Individual port power control. Port overcurrent sensing (OCS)/por t power control interface with LEDs for port power indication. Red LED indicator for active hub state (not suspend). EMI suppression provided by ferrite beads, sele ction of capacitors, and internal power/ground layers. ESD protection up to 25 kV direct contact to USB signals provided with diode bridges and common mode chokes.
1.2 General Description
The EVB-USB2514Q36-BAS is a demonstration and lo w-cost evaluation platform featuring the USB2514 MultiTRAK™ 4-port, Low-Power High-Speed USB2.0 Hub. It is designed to robustly demonstrate the unique features of this device using a low-cost PCB implementation with individual port power control. The EVB-USB2514 is designed for low cost, power efficient implementation of a Hi-speed USB Hub with minimal bill of materials. Schematics, layout, and bill of materials are included minimizing the customers new product development time. between power and ground to reduce EMI. Ferrite beads have been added on all connector ground and power nets. Protective diode bridges and common mode chokes were added to all USB signals. Figure 2.1 and Figure 2.2 show the top and bottom level silk screen and copper layers.
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board, Revision C User Manual USER MANUAL
2 Hardware Configuration
2.1 Hardware Description
The EVB-USB2514Q36-BAS has one onboard regulator, which generates +3.3 VDC from a +5.0 VDC power supply. An alternate footprint U5 was added to support industrial temperature range. The alternate footprint supports a larger package and has ties into the ground plane for better thermal dissipation. The USB2514 generates is own on chip +1.8 VDC supply. The USB2514 Hub consumes power from the +3.3 VDC supply while the MIC20 26 Power distribution switch consumes power from the +5.0 VDC supply. The MIC2026 Power distribution switch supplies downstream power to each attached device.
2.1.1 Port Assignment
Downstream ports are numbered 1 through 4 with in dividual port power controllers. The port power controllers provide 5 Volt power with over-current protection to the downstream devices. Upstream and downstream port connectors have USB 2.0 compliant decoupling, filtering for EMI on signal ground and power, and a separate shield ground. ESD protection for USB signals is provided by diode bridges and common mode chokes. This gives protection up to 25 kV direct contact to USB signals. Optional pull-up resistors can be placed to disable a USB port, see the schematic on the CD-ROM included with your EVB-USB2514Q36-BAS for implementation.
2.1.2 HUB Configuration
The EVB-USB2514Q36-BAS has been configured to s upport internal default configuration with strapping options enabled as determined by t he state of CFG_SEL[1] and CFG_SEL[0] pins immediately after reset. The internal +1.8 VDC regu lator supplies voltage to the oscillator and PLL is turned off during suspend to minimize suspend current.
2.1.3 Powered State LED
An optional LED (LED5) indicates when +5.0 VDC power is present.
2.1.4 Active State LED
An optional LED (LED6) indicates when the hub is active (configured and not suspended).
2.1.5 Port Power LEDs
LED1, LED2, LED3, and LED4 indicate when port po wer is available to the associated downstream USB port.
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board, Revision C User Manual USER MANUAL
2.1.6 Connector Description
The EVB-USB2514Q36-BAS has a set of standard USB style connec tors, one of type B for the upstream port and four of type A for downstream ports. Power is supplied via a 2.0 mm power jack. Table 2.1 lists all of the connectors. For more details on the pinout of these connectors, please see the EVB-USB2514Q36-BAS schematics on the CD- ROM included with your EVB-USB2514Q36-BAS.
2.1.7 Layout Considerations
The EVB-USB2514Q36-BAS is designed on four PCB layers−−two signal layers and two supply layers. The PCB layer stackup is shown in Table 2.2. All signals are routed on top and bottom layers. Internal layers are ground and power. Note that the differ ential signals from the USB2514 match the upstream and downstream port placement simplifying routing of critical signals. Table 2.1 Connector Description CONNECTOR TYPE DESCRIPTION J1 USB A Downstream USB Port 1 J2 USB A Downstream USB Port 2 J3 USB A Downstream USB Port 3 J4 USB A Downstream USB Port 4 J5 USB B Upstream USB Port 0 J6 Power Jack 2.0 mm +5.0 VDC Power Supply Table 2.2 PCB layer stack Component Side Solder mask Layer 1 1.9 - 2.8 mil, finished Pre-preg 4.25 mil, +/- 0.25 mil FR-4 Layer 2 -- GND 1.3 mil (nominal) Core ~24 mil FR-4 Layer 3 -- POWER 1.3 mil (nominal) Pre-preg 4.25 mil, +/- 0.25 mil FR-4 Layer 4 1.9 - 2.8 mil, finished Solder mask Solder Side
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board, Revision C User Manual USER MANUAL Component side top layer is shown in Figure 2.1 with silk screen information to identify component locations. Figure 2.1 EVB-USB2514Q36-BAS Top Layer - Component Side
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board, Revision C User Manual USER MANUAL Figure 2.2 EVB-USB2514Q36-BAS Bottom Layer - Solder Side