Cirrus Logic AN255 User Manual
Warning
Copyright
© Cirrus Logic, Inc.
2005(All Rights Reserved)
http://www.cirrus.com
AN255
Populating the USB Components on the EDB9301
Development Board
1. Introduction
This document provides the information needed to populate the USB area of the EDB9312 board. By de-
fault, the USB components are not installed at time of PCB assembly. This document has a short Bill of
Material (BOM) in Table 1 that identifies the part numbers and reference designators of the components
required for USB operation. Figure 1 shows the component placement on the PCB. The part numbers in
the BOM are all available from DigiKey (www.digikey.com) as well as a variety of other component sourc-
es.
2. Instructions
Refer to the CD for the board schematics. The schematic will show the reference designators and the val-
ue for the parts. Located at the bottom of page 2 of the EDB9301 schematics is the USB circuit. The BOM
for the USB circuit is at the end of this document.
WARNING
The customer is allowed to populate the USB portion of the EDB9301 circuit board without voiding any
warranty only as long as appropriate anti-static precautions, proper soldering techniques and professional
standards of workmanship are followed.
Table 1. USB Circuit Bill of Material (BOM)
Item Quantity Footprint
Description
Part
Number
Part
Manufacturer
Reference
Designator
1
1
THOLE
Connector, USB, Right Angle, Type A
787616-1
AMP
J8
2
2
0603
Resistor, 15K, 1/10W, 5%
ERJ-3GEYJ153V
Panasonic
R127,R128
3
2
0603
Resistor, 15 Ohm, 1/10W, 5%
ERJ-3GEYJ150V
Panasonic
R125,R126
4
2
0603
Capacitor, 47pF, 50V, NPO
ECJ-1VC1H470J
Panasonic
C115,C117
5
1
0603
Capacitor, 0.1uF, 25V, XR7
ECJ-1VB1E104K
Panasonic
C109
6
1
Case B
Capacitor, 10uF, 16V, Tantalum
T491B106K016AS
Kemet
C111
7
1
Case C
Capacitor, 100uF, 6.3V, Tantalum
EEJ-L0JC107R
Panasonic
C113
JAN ‘05
AN255REV2