SMSC EVB-USB2514Q36-BAS, Руководство пользователя

Страница: 4 / 6

EVB-USB2514Q36-BAS, USB2513 and USB2512 36-Pin QFN Evaluation Board, Revision C User Manual
Revision 0.3 (08-12-10) 4 SMSC EVB-USB2514Q36-BAS Revision C
USER MANUAL
2.1.6 Connector Description
The EVB-USB2514Q36-BAS has a set of standard USB style connectors, 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 differential 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