DM3730/AM3703 Shield Cover Datasheet by Beacon EmbeddedWorks

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D LOGIC PD”
PN 1028149A Logic PD, Inc. All Rights Reserved. i
DM3730/AM3703 Torpedo + Wireless SOM
EU Emissions Shield Cover
Application Note 616
Logic PD // Products
Published: February 2016
This document contains valuable proprietary and confidential information and the attached file contains source code, ideas,
and techniques that are owned by Logic PD, Inc. (collectively “Logic PD’s Proprietary Information”). Logic PD’s Proprietary
Information may not be used by or disclosed to any third party except under written license from Logic PD, Inc.
Logic PD, Inc. makes no representation or warranties of any nature or kind regarding Logic PD’s Proprietary Information or
any products offered by Logic PD, Inc. Logic PD’s Proprietary Information is disclosed herein pursuant and subject to the
terms and conditions of a duly executed license or agreement to purchase or lease equipment. The only warranties made
by Logic PD, Inc., if any, with respect to any products described in this document are set forth in such license or
agreement. Logic PD, Inc. shall have no liability of any kind, express or implied, arising out of the use of the Information in
this document, including direct, indirect, special or consequential damages.
Logic PD, Inc. may have patents, patent applications, trademarks, copyrights, trade secrets, or other intellectual property
rights pertaining to Logic PD’s Proprietary Information and products described in this document (collectively “Logic PD’s
Intellectual Property”). Except as expressly provided in any written license or agreement from Logic PD, Inc., this
document and the information contained therein does not create any license to Logic PD’s Intellectual Property.
The Information contained herein is subject to change without notice. Revisions may be issued regarding changes and/or
additions.
© Copyright 2016, Logic PD, Inc. All Rights Reserved.
REV EDITOR DESCRIPTION APPROVAL DATE JMC mtlal Release JMC A 553 2/17/16
AN616 DM3730/AM3703 Torpedo + Wireless SOM EU Emissions Shield Cover
PN 1028149A Logic PD, Inc. All Rights Reserved. ii
Revision History
REV
EDITOR
DESCRIPTION
APPROVAL
DATE
A
JMC
Initial Release
JMC, AF
, BSB
2/1
7
/16
AN616 DM3730/AM3703 Torpedo + Wireless SOM EU Emissions Shield Cover
PN 1028149A Logic PD, Inc. All Rights Reserved. iii
Table of Contents
1 Introduction .................................................................................................................... 1
2 Scope .............................................................................................................................. 1
3 How to Identify Your SOM ............................................................................................... 1
4 EU Spurious Emissions Results ........................................................................................ 1
5 Shield Cover Description and Ordering Information ........................................................ 2
6 Shield Cover Installation ................................................................................................. 2
7 Summary ......................................................................................................................... 3
SOM seen in this example 5 a -30 T+W SOM. A >32 T+W SOM w characters on this 4 line. Addi onal information on the model n Lociic PD Model Number Explanation & Decoder White Paper 293 1mm REV E l5V1MU1215 SOMDManurao NEDAKCR-i com downioads 601 PART NUMBER PART NUMBER REVISION SERIAL NUMBER MODEL NUMBER 2nd HALF OF THE MODEL NUMBER
AN616 DM3730/AM3703 Torpedo + Wireless SOM EU Emissions Shield Cover
PN 1028149A Logic PD, Inc. All Rights Reserved. 1
1 Introduction
This application note describes the application and installation of a mechanical electromagnetic
emissions shield cover for the -32 model Torpedo + Wireless SOM. This shield cover is
necessary in order for the SOM to comply with the European Union (EU) standards for spurious
emissions.
2 Scope
This document, and the shield cover described herein, only apply to the -32 model of the
DM3703/AM3703 Torpedo + Wireless (T+W) SOM. Further, this shield cover is only necessary
when using the -32 model T+W SOM in regions covered by EU standard EN 301 893
v1.8.1:2015. This shield cover is not required for products deployed with the -32 model T+W
SOM in the USA or Canada.
3 How to Identify Your SOM
You can determine which SOM you have by referencing the model number on the label of the
SOM. Figure 1 shows the beginning of the model number in the 4th line of the label. The
SOM seen in this example is a -30 T+W SOM. A -32 T+W SOM will include “-32” as the final
characters on this 4th line. Additional information on the model number can be found in the
Logic PD Model Number Explanation & Decoder White Paper 2931.
Figure 1: DM37x Torpedo + Wireless SOM Label
4 EU Spurious Emissions Results
During EU standards testing of the -32 model T+W SOM, it was found that the SOM did not
comply with the receiver spurious emissions limit specified in section 4.6 of standard EN 301
893 v1.8.1:2015. This testing was performed on WiFi channel 48 where a spectral peak at
approximately 13.1GHz was measured above the allowable spectral limit.
Further testing verified that the out of spec spurious emission was emanating from the case of
the radio module on the SOM. The spurious emission was not found on the antenna ports of
the SOM.
The shield cover described in section 5 was designed as a custom cover to be fitted over the
radio module on the SOM to suppress the offending spurious emission.
1https://support.logicpd.com/downloads/601/
an accessory part th ELD. NOTE ORIENTATION
AN616 DM3730/AM3703 Torpedo + Wireless SOM EU Emissions Shield Cover
PN 1028149A Logic PD, Inc. All Rights Reserved. 2
5 Shield Cover Description and Ordering Information
The shield cover is a single piece metal cap that snaps in place over the metal case of the
radio module that resides on the T+W SOM assembly. An outline drawing of this shield cover
is shown below in Figure 2.
The shield cover is an accessory part that can be ordered from Logic PD’s authorized
distributors (Digi-Key ). The part number assigned to this shield cover is
LPD-SOM-EU-SHIELD.
Figure 2: Shield Cover Outline Drawing
6 Shield Cover Installation
The shield cover is installed by snapping it in place over the radio module on the T+W SOM
assembly as shown in Figure 3. The correct orientation of the shield cover is important to
ensure proper shielding of the emissions coming from the radio module. As shown in Figure 3,
the side of the shield cover that contains the two latching dimples needs to be positioned on
the outside edge of the SOM assembly.
To install the shield cover, position it squarely over the metal case of the radio module and
press down evenly on the shield. When the shield is fully seated you’ll hear the three latching
dimples snap into place as the cover attaches to the radio module metal case.
Figure 3: Shield Cover Installation and Orientation
tional information about this EU emis Log c PD Techn al scus on Group su art 0 IC dcom DGForum s x
AN616 DM3730/AM3703 Torpedo + Wireless SOM EU Emissions Shield Cover
PN 1028149A Logic PD, Inc. All Rights Reserved. 3
7 Summary
Information in this application note has been provided to assist customers using the -32 model
Torpedo + Wireless SOM in regions covered by the European Union electromagnetic emissions
standards.
For customers needing additional information about this EU emissions shield cover application,
please submit a post to the Logic PD Technical Discussion Group2forum.
2https://support.logicpd.com/TDGForum.aspx

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