SMSC EVB-USB2517 Revision 1.2 (1-7-09)
USER MANUAL
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EVB-USB2517
Evaluation Board User Manual
(Revision A)
EVB-USB2517 Evaluation Board User Manual (Revision A)
Revision 1.2 (1-7-09) 2 SMSC EVB-USB2517 Revision A
USER MANUAL
1 Overview
The SMSC USB2517 is a low-power, OEM configurable, hub controller IC with 7 downstream ports for
embedded USB solutions. The USB2517 is a USB 2.0-compliant MultiTRAK™ hub that supports low-
speed, full-speed, and hi-speed downstream devices. The EVB-USB2517 evaluation board
demonstrates a stand alone application for the hub with all of the features listed below. The SMSC
evaluation board demonstrates advanced power saving options and configurable port assignments.
1.1 Features
Low pin count: 64-pin QFN package
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 V, regulated) 'wall wart' external power supply
Low cost 4-layer design: two outer signal layers, power and ground inner layers
Self-powered operation
Multi-TT enabled
Supports internal default hub configuration (optional support configuration from external EEPROM)
Single onboard +3.3 V regulator
Single crystal clock source
Individual port over-current sensing
Individual port power control
Port OCS/port power control interface with LEDs for optional port power indication
Red LED indicator for Hi-Speed hub state
Standard USB amber/green LED indicators for operational state indication
EMI suppression provided by selection of capacitors and inner power/ground PCB layers
1.2 General Description
The EVB-USB2517 is a low-cost evaluation platform featuring the USB2517 7-port, low-power, hi-
speed USB 2.0 hub with MultiTRAK™ technology. The platform is designed to robustly demonstrate
the unique features of this device using a low-cost PCB implementation with individual port power
control. The EVB-USB2517 is designed with efficient power usage for the implementation of a hi-speed
USB hub with minimal bill-of-materials. Schematics, layout, and bill-of-materials are included to
minimize new product development time.
Revision A of the EVB-USB2517 features a four-layer printed circuit board to improve coupling
between power and ground layers to reduce EMI.
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SMSC EVB-USB2517 Revision A 3 Revision 1.2 (1-7-09)
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2 Hardware Configuration
2.1 Hardware Description
The EVB-USB2517 has one onboard regulator, which generates 3.3 volts from an external 5 volt power
supply. The USB2517 generates its own on-chip 1.8 volt supply. The internal 1.8 volt regulator to the
oscillator and the PLL is turned off during suspend to minimize suspend current. The USB2517 hub
consumes power from the 3.3 volt supply. Downstream port power is distributed by four power switches
(U1, U2, U6 and U7) that consume power from the 5 volt supply.
2.1.1 Port Assignment
Downstream ports are numbered one through seven with individual port power controllers. The port
power controllers provide 5 volts of power with over-current protection to the downstream devices.
Upstream and downstream port connectors have USB 2.0 compliant decoupling and a separate shield
ground.
2.1.2 Hub Configuration
Default: The EVB-USB2517 has been set up to support internal default configuration with no strapping
options enabled as determined by the state of CFG_SEL2, CFG_SEL1 and CFG_SEL0 pins
immediately after reset.
EEPROM Option: The EVB-USB2517 can load configuration from an external two-wire, I2C EEPROM
U5. To enable this option, change the states of CFG_SEL2 and CFG_SEL1. Program and install an
EEPROM at U5. This option allows access to all of the configuration registers and ID strings for the
USB2517 device for detailed and desired functional analysis and exercise. The EVB-USB2517 is
compatible with I2C EEPROMs from several manufacturers. The minimum memory requirement is 256
bytes.
2.1.3 Port Power LEDs
LEDs 9,10,11,12,16,17, and 18 can be arranged to indicate when port power is available. This feature
is optional and consumes power in suspend mode. The recommendation is to leave this feature
unpopulated for low-cost and low-power implementations.
2.1.4 Hi-Speed Indicator LED
A red LED, LED14 or LED15 (depending on the strapping of HS_IND/CFG_SEL1), indicates when the
hub’s upstream port is connected at Hi-Speed.
2.1.5 Powered State LED
An optional LED, LED13, indicates when power is present.
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2.1.6 Connector Description
The EVB-USB2517 has a set of standard USB style connectors:
One type B connector for the upstream port
Seven type A connectors for downstream ports
Power is supplied via a 2.0 mm power jack. Please refer to Table 2.1 for a list of the connectors. For
more details on the pinout of the connectors please refer to the schematics in Figure 2.1 and
Figure 2.2.
2.1.7 Layout Considerations
The EVB-USB2517 is a low-power, hi-speed USB 2.0 compliant hub on four PCB layers. Please refer
to Table 2.2 for a list of the PCB layer stackup. Differential signals from the USB2517 match the
upstream and downstream port placement to simplify the routing of critical signals.
The top layer of the component side is shown in Figure 2.1. The schematic includes silk screen
information to identify component locations.
Table 2.1 Connector Descriptions
CONNECTOR TYPE DESCRIPTION
J0 USB B Upstream Port
J1 USB A Downstream Port 1
J2 USB A Downstream Port 2
J3 USB A Downstream Port 3
J4 USB A Downstream Port 4
J5 USB A Downstream Port 5
J6 USB A Downstream Port 6
J7 USB A Downstream Port 7
J8 Power Jack 2.0 mm +5 V Power Supply
Table 2.2 PCB Layer Stackup
COMPONENT SIDE
Solder mask
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 1.0 oz., nominal
Pre-preg 4.0 - 4.5 mil FR-4
Layer 4 1.3 - 2.3 oz., finished
Solder mask
Solder Side
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Figure 2.1 EVB-USB2517 64-Pin Component Side Top Layer
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Figure 2.2 EVB-USB2517 64-Pin Solder Side Bottom Layer
