National Semiconductor LMX9838DONGLE User Manual

LMX9838DONGLE - Hardware User Guide

LMX9838DONGLE - Hardware
User Guide

1.0 Scope

National Semiconductor LMX9838 Bluetooth™ serial dongle
evaluation kit is a plug and play serial adapter for serial
cable replacement applications and more. It is able to sup­port more profiles than just the Serial Port Profile (including
audio support with external codec boards). By using the
enclosed Simply Blue Commander software, it allows user
to develop their own SW applications easily given the built
in interpreter for HEX commands. SBSmart is a higher level
application tool that provides buttons with the built in com­mands to easily set up or demonstrate different profile sup­port using the Simply Blue SPP package.

National Semiconductor
Application Note 1710
Markus Roemer
September 2007

2.0 General Description

2.1 EVALUATION KIT CONTENTS

 LMX9838 Bluetooth serial adapter reference board
 USB Dongle and application software stack
 Null modem cable
 Sedona Lite board (Audio CODEC Board)
 110V to 240V AC to 5V DC power adapter and pigtail
 CDROM with design documents and Simply Blue soft-

ware Applic ation tools.

2.2 LMX9838 BLUETOOTH SERIAL ADAPTER

Figure 1. LMX9838Dongle and Sedona Lite Board

©2007 National Semiconductor Corporation www.national.com

3.0 Qualification

 FCC certified:

AN-1710

• FCC ID: ED9LMX9838

 FCC compliance: The device complies with Part 15 of

FCC Rules. Operati on is subject to the following two co n­ditions:

4.0 Requirement and Setup

• This device may not cause harmful interference

• This device must accept any interference received, in-

cluding interferen ce that ma y caus e unde sired opera­tion

 IC certified:

• IC: 1520A-LMX9838

 Bluetooth SIG QD ID: B012394

4.1 BASIC REQUIREMENT

 X86 PC with serial port.
 One of the following operating system is required.

• Windows 2000

• Windows XP

4.2 APPLICATION SOFTWARE

4.2.1 Simply Blue Commander

Application command oriented tool to generate commands
and watch ev ents in the Simply B lue Command inter face
window. Reference the Simply Blue Commander User
Guide document for detail s.

4.2.2 SBSmart

Easy to use Windows based tool to demonstrate additional
profile support of the Simply Blue functionality. Reference
the SBSmart User Guide for additional details.

4.2.3 Patch Programming

LMX9838 allows for patch programming for firmware
updates if necessary. Reference [2] for details. This can
also be done with the Simply Blue Commander and
SBSmart tools.

5.0 Functional Description

5.1 POWER SUPPLY

 DC Power Jack (6V max)
 Battery Holder (6V max)

5.2 MAIN SYSTEM

 Reset butto n for manual Reset
 Jumper option for Baud rate selection

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Figure 2. System Block Diagram

5.3 UART INTERFACE

DB9 connector for RS232 standard PC interface using On­board level shifter IC for handling LMX9838 module’s 3.3V
UART interface.

5.4 ADVANCE AUDIO INTERFACE

 Support Audio applications
 PCM codec interface (support linear and A-law)
 PCM Master or Slave operation (SW configurable)
 Direct connection to Sedona Lite Board (A-law only)

6.0 Design Consideration

AN-1710

7.1 PCB DESIGN

6.1 POWER MANAGEMENT

 3.3V output single LDO is used to provide power for

RS232 interface chip and Digital po rtion of the LMX983 8.

7.0 Layout

The LMX9838 reference design is split into 2 sections, one
section is RS232 transceiver circuit for PC connection,
another section is LMX9838 main circuit for Host proces­sor.

 4 layers PCB
 1.6 mm overall thickness

7.2 LAYERS CLASSIFICATION

 Top layer is the components and connection wiring
 Layer 2 is Ground plane
 Layer 3 is Power plane
 Bottom layer is interface signals

Figure 3. LMX9838Dongle

8.0 AUDIO CODEC Board

Sedona Lite Board c on t ai ns an audio codec a nd two phone
jacks. This board can be used in conjuction with
LMX9838DONGLE to realize the audio (SCO) transmis­sion and reception capabilities. (See Table 9)

Figure 4. Sedona Lite Audio Codec Board

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