Cirrus Logic AN255 User Manual

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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

THOLE

Connector, USB, Right Angle, Type A

787616-1

AMP

0603

Resistor, 15K, 1/10W, 5%

ERJ-3GEYJ153V

Panasonic

R127,R128

0603

Resistor, 15 Ohm, 1/10W, 5%

ERJ-3GEYJ150V

Panasonic

R125,R126

0603

Capacitor, 47pF, 50V, NPO

ECJ-1VC1H470J

Panasonic

C115,C117

0603

Capacitor, 0.1uF, 25V, XR7

ECJ-1VB1E104K

Panasonic

C109

Case B

Capacitor, 10uF, 16V, Tantalum

T491B106K016AS

Kemet

C111

Case C

Capacitor, 100uF, 6.3V, Tantalum

EEJ-L0JC107R

Panasonic

C113

JAN ‘05

AN255REV2