EVB-USB2514Q36-BAS, USB2513 and USB2512 36

EVB-USB2514Q36-BAS, USB2513 and USB2512 36
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin
QFN Evaluation Board User Manual
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SMSC EVB-USB2514Q36-BAS Revision B
Revision 1.1 (10-22-08)
USER MANUAL
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board User Manual
1 Overview
The SMSC USB2514 MultiTRAK™ is a Low-Power Full-Featured High-Speed USB2.0 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 other versions of the evaluation board are
available using the same printed circuit board populated with either the USB2512, 2-port hub or the
USB2513, 3-port hub with part numbers EVB-USB2512Q36-BAS and EVB-USB2513Q36-BAS.
1.1
1.2
Features
„
USB2514 36 - pin QFN package low pin count. USB2512 for 2-port version and USB2513 for 3port version.
„
High-Speed (480Mbits/s), Full-Speed (12Mbits/s), and Low-Speed (1.5Mbits/s) compatible.
„
Operates from a single voltage (+5.0V, regulated) 'wall wart' external power supply.
„
Low Cost 4-Layer Design: two outer signal layers, power and ground inner layers.
„
Optional pull-up resistors for disabling individual downstream ports.
„
Self-powered operation.
„
Multi-TT enabled (USB2513/14 only).
„
Supports internal default hub configuration.
„
Single Onboard +3.3V Regulator. A footprint is provided for alternate regulator for industrial
temperature operation.
„
Single Crystal Clock Source.
„
Individual port over-current sensing.
„
Individual port power control.
„
Port OCS/Port Power Control interface with LEDs for port power indication.
„
Red LED indicator for active hub state (not suspend).
„
EMI suppression provided by ferrite beads, selection 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.
General Description
The EVB-USB2514Q36-BAS is a demonstration and low-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
High speed USB Hub with minimal bill of materials. Schematics, Layout, and Bill of Materials are
included minimizing the customers new product development time.
Revision B of the EVB-USB2514Q36-BAS has a four-layer printed circuit board to improve coupling
between power and ground to reduce EMI. Ferrite beads were added on all connector ground and
power nets. Protective diode bridges and common mode chokes were added to all USB signals.
Revision 1.1 (10-22-08)
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USER MANUAL
SMSC EVB-USB2514Q36-BAS Revision B
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board User Manual
2 Hardware Configuration
2.1
Hardware Description
The EVB-USB2514Q36-BAS has one on board regulator, which generates 3.3V from 5V 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 1.8V supply. The USB2514 Hub consumes power from the 3.3V
supply while the MIC2026 Power distribution switch consumes power from the 5V supply. The
MIC2026 Power distribution switch supplies downstream power to each attached device.
2.1.1
Port Assignment
Down-stream ports are numbered 1 through 4 with individual port power controllers. The port power
controllers provide 5 Volts 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 schematic for implementation.
2.1.2
HUB Configuration
The EVB-USB2514Q36-BAS has been configured to support internal default configuration with
strapping options enabled as determined by the state of CFG_SEL1 and CFG_SEL0 pins immediately
after reset. The internal 1.8V regulator supplies voltage to the oscillator and PLL is turned off during
suspend to minimize suspend current.
2.1.3
Port Power LEDs
LEDs 1-4 can be placed to indicate when port power is available. This feature is optional and
consumes power in suspend mode. The recommendation is to leave unpopulated for low cost and low
power implementations.
2.1.4
Active State LED
A red LED, LED6 indicates when the hub is not in suspend.
2.1.5
Powered State/Backlight LED
An optional LED, LED5 indicates when 5V power is present.
2.1.6
Connector Description
The EVB-USB2514Q36-BAS has a standard set of USB style connectors, one of type B for upstream
ports and four of type A for downstream ports. Power is supplied via a 2.0 mm power jack. Table 2.1
lists all the connectors. For more details on the pinout of the connectors please see the schematic.
Table 2.1 Connector Description
CONNECTOR
TYPE
DESCRIPTION
J5
USB B
Upstream Port
J1
USB A
Downstream Port 1
J2
USB A
Downstream Port 2
J3
USB A
Downstream Port 3
SMSC EVB-USB2514Q36-BAS Revision B
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USER MANUAL
Revision 1.1 (10-22-08)
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board User Manual
Table 2.1 Connector Description (continued)
2.1.7
CONNECTOR
TYPE
DESCRIPTION
J4
USB A
Downstream Port 4
J6
Power Jack 2.0mm
+5V Power Supply
Layout Considerations
The EVB-USB2514Q36-BAS is a Low-Power High-Speed USB2.0 compliant hub on four PCB layers
see Table 2.2 for PCB stackup. All signals are routed on the top layer demonstrating the simplicity of
implementation. Differential signals from the USB2514 match the upstream and downstream port
placement, simplifying routing of critical signals.
Component side top layer is shown in Figure 2.1 with silk screen information to identify component
locations.
Table 2.2 PCB stackup
Component Side
Soldermask
Layer 1
1.3 - 2.3 oz., finished
pre-preg
4.0 - 4.5 mil FR-4
Layer 2
1.0 oz., nominal
core
28 mil FR-4
Layer 3
1.0oz., nominal
pre-preg
4.0 - 4.5 mil FR-4
Layer 4
1.3 - 2.3 oz., finished
Soldermask
Solder Side
Revision 1.1 (10-22-08)
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USER MANUAL
SMSC EVB-USB2514Q36-BAS Revision B
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board User Manual
Figure 2.1 EVB_USB2514-36 Pin Component Side Top Layer
SMSC EVB-USB2514Q36-BAS Revision B
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USER MANUAL
Revision 1.1 (10-22-08)
EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board User Manual
Figure 2.2 EVB_USB2514-36 Pin Solder Side Bottom Layer
Revision 1.1 (10-22-08)
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USER MANUAL
SMSC EVB-USB2514Q36-BAS Revision B
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