Cirrus Logic AN255 User Manual

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 d e­fault, 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 sourc­es.

2. Instructions

Refer to the CD for the board schematics. The schematic will show the reference designators and the val­ue 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

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 C1 11
7 1 Case C Capacitor, 100uF, 6.3V, Tantalum EEJ-L0JC107R Panasonic C113

Part

Manufacturer

Reference

Designator

http://www.cirrus.com

Copyright © Cirrus Logic, Inc.

2005(All Rights Reserved)

JAN ‘05

AN255REV2

Figure 1. Component Placement

R125

R125

C115

C115

R126

R126
C117

C117

Revision Date Changes

1 13 April 2004 Initial Release
2 Jan 2005 Changed item 7 from 100uF, 100V, XR7 to 100uF, 6.3V, Tantalum.

AN255

Contacting Cirrus Logic Support

For all product questions and inquiries contact a Cirrus Logic Sales Representative.
To find one nearest you go to //www.cirrus.com

IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidi aries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, t h e inf o rmati o n i s su bj ect

to change without not ice and i s provi ded "AS I S" witho ut warrant y of an y kind ( express o r impli ed). Cust omers are advised t o obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
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copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con­sent for copies to be made of the i nformation only for use within your organization with res pect to Cirrus integrated ci rcuits or other products of Cirrus. This consent
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LINUX is a registered trademark of Linus Torvalds.

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