Ericsson C5621 User manual

C5621 and C33 User Guide
USER GUIDE
1/1553-KRD 131 24 Uen Rev D

C5621 and C33 User Guide
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Ericsson Confidential
© Ericsson AB 2011
All rights reserved. The information in this document is the property of
Ericsson. Except as specifically authorized in writing by Ericsson, the
receiver of this document shall keep the information contained herein
confidential and shall protect the same in whole or in part from disclosure
and dissemination to third parties. Disclosure and disseminations to the
receiver's employees shall only be made on a strict need to know basis. The
information in this document is subject to change without notice and
Ericsson assumes no responsibility for factual inaccuracies or typographical
errors.

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Abstract
This document describes the Ericsson Mobile Broadband Modules C5621 and
C33 from a user perspective. End-user value, functionality, features and basic
building blocks are described.
This user guide for C5621 and C33 gives the reader a deeper technical
understanding of the features, applications and configuration of C5621 and
C33. A simplified technical explanation of GSM/GPRS/EDGE and
UMTS/HSPA/HSPA Evolution data services is also included in this document.
Trademark and Acknowledgements
Microsoft, Windows, Windows XP, Windows Vista and Windows 7 are
registered trademarks or trademarks of Microsoft Corporation in the United
States and/or other countries.
Android is the registered trademark of Google Inc.
Ericsson is a trademark of Telefonaktiebolaget LM Ericsson.
All trademarks are the property of their respective owners. All other product or
service names mentioned in this document are trademarks of their respective
companies.

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Contents
1Product Overview ..................................................................................6
1.1 Product Features .....................................................................................6
2Communication......................................................................................8
2.1 Network Technologies .............................................................................8
2.1.1 3G ............................................................................................................8
2.1.2 2G ............................................................................................................9
2.2 Core features ...........................................................................................9
2.2.1 Browsing and Internet access..................................................................9
2.2.2 SMS .........................................................................................................9
2.2.3 GPS .......................................................................................................10
3Hardware Overview..............................................................................11
3.1 General ..................................................................................................11
4Routing guidelines...............................................................................11
4.1 Recommended PCB Footprint ...............................................................12
4.2 Digital I/O routing ...................................................................................13
4.2.1 Clock Routing.........................................................................................14
4.2.2 USB Routing ..........................................................................................14
4.3 Power Routing .......................................................................................15
4.3.1 VBAT Routing ........................................................................................15
4.3.2 GND .......................................................................................................15
4.4 RF Routing.............................................................................................15
5Production Guideline...........................................................................16
5.1 Package type .........................................................................................16
5.2 Floor life and dry storage .......................................................................16
5.3 Screen stencil design.............................................................................16
5.4 Assembly ...............................................................................................16
5.5 Reflow soldering ....................................................................................17
6Packaging – Tape and Reel Information............................................18
7SW integration......................................................................................20
7.1 Driver and Application Architecture........................................................20
7.1.1 Windows XP and Vista Architecture ......................................................20
7.1.2 Windows 7 Architecture .........................................................................21
7.1.3 Linux driver architecture.........................................................................23
7.2 Connection Profile List ...........................................................................24
7.3 Ericsson Mobile Broadband C++ API ....................................................24
7.4 State machine ........................................................................................25
7.5 Service Windows Registry Keys ............................................................26
7.5.1 Module state ..........................................................................................26
7.5.2 TCP/IP Configuration .............................................................................27
8Operational and Regulatory information ...........................................28

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8.1 Operational Information .........................................................................28
8.1.1 Wireless Interoperability.........................................................................28
8.1.2 Safety.....................................................................................................28
8.1.3 Recommendations .................................................................................29
8.1.4 Children..................................................................................................29
8.1.5 Disposal of old electrical & electronic equipment...................................30
8.1.6 Emergency calls.....................................................................................30
8.2 Regulatory Information...........................................................................30
8.2.1 United States, FCC Notices ...................................................................30
8.2.2 European Union, EU Declaration of Conformity ....................................32
8.3 Conformity Assessment of Telecommunication Equipment
regulation in Thailand.............................................................................34
8.4 Related Information................................................................................34
9Environmental Declaration .................................................................34
10 Terminology and Abbreviations .........................................................36

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1 Product Overview
C5621 and C33 are Mobile Broadband Modules (see photo below) for UMTS
and GSM. They enable host device users to have flexible and high speed
mobile access to the Internet or corporate network, including “always online”
capability. They support data services through HSPA Evolution, UMTS,
EDGE, GPRS, and Data message service. C5621 has a GPS receiver which
is working with most common positioning applications. Updated versions of
the PC application software, drivers and module firmware can be installed by
the end user.
1.1 Product Features
C5621 and C33 are flexible and automatically choose the best data service
available in a particular location, whether it is HSPA Evolution, UMTS, EDGE
or GPRS. This is particularly useful for users roaming on several different
networks.
As a quad-band device, C5621 can operate globally. It automatically chooses
between UMTS band I, II, V/VI, or VIII. C33 is a dual band module for regional
markets. C5621 and C33 are also quad-band GSM devices, and can operate
on GSM systems all over the world. Therefore, users can use wireless
communication from their host devices on all five continents, in over 205
countries.

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With the C5621 and C33 Mobile Broadband Module installed in a host device,
it is always available for data transfer. Connection settings are automatically
configured based on the SIM card. The user simply clicks the “Connect” button
to make an Internet connection. Parameter settings suitable for many
networks are included and can be configured if needed to facilitate manual
configuration where required. A status screen and an icon in the notification
area enable users to check status information such as signal strength, to
perform common functions and to access help.
C5621 and C33 have wide host device compatibility. They are designed to use
the integrated antennas in host devices. C5621 and C33 support the Microsoft
Windows XP, Vista, Windows 7, Linux, and Android operating systems. Since
the modules are designed for host devices, they are better integrated and
provide a superior end-user experience compared to generically produced
USB dongles that need to work across multiple computing platforms.
The built-in GPS receiver in the C5621 module provides positioning data
compatible with most commonly used positioning applications, to show the
position on maps, trace the route, or provide driving directions. There are
product variations, where the GPS is omitted.

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2 Communication
The C5621 and C33 Mobile Broadband Modules keep end users up to date by
providing them the best available mobile service wherever they are.
C5621 and C33 are dual mode devices, able to connect via UMTS/HSPA and
GSM/GPRS/EDGE. The user will remain connected without having to think
about what system is being used – the handover between two systems and
network technologies is automatically managed by C5621 and C33. C5621
comes in a hardware version supporting both quad-band UMTS (Band I, II,
V/VI and VIII) and quad-band GSM/GPRS/EDGE (850/900/1800/1900 MHz).
C33 has dual band support.
2.1 Network Technologies
2.1.1 3G
3G (third-generation) services combine high-speed radio access with IP-based
(Internet Protocol) services. This not only means fast mobile connection to the
Internet, but also a totally new way to communicate, access information,
conduct business, learn and be entertained.
Compared to 2G mobile networks, 3G significantly boosts network capacity, a
much needed feature in densely populated areas. This means that operators
are able to support more users and offer them more sophisticated services.
2.1.1.1 HSPA Evolution
For C5621, HSPA (High Speed Packet Access) Evolution enables downlink
speeds up to 21 Mbps (HSDPA cat 14) and uplink speeds up to 5.76 Mbps
(HSUPA cat 6). Higher order modulation results in higher possible speeds in
the network.
2.1.1.2 HSPA
HSPA is available in all developed 3G markets. With the HSDPA solution,
C5621 is capable of downlink speeds of up to 14.4 Mbps (HSDPA cat 10) and
uplink speeds of up to 5.76 Mbps (HSUPA cat 6). This, together with its
antenna diversity technology, gives C5621 and C33 a fast and reliable
connection.
C33 supports HSPA (High Speed Packet Access) downlink speeds up to 3.6
Mbps (HSDPA cat 6) and uplink speeds up to 384 kbps (WCDMA).

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2.1.1.3 WCDMA
The initial implementation of 3G networks enables Internet or corporate
network access at bidirectional data rates of up to 384 kbps.
2.1.2 2G
GSM/GPRS coverage is available in almost all populated areas of the world
and provides a secure fall back so that network connection is maintained.
2.1.2.1 GPRS
GPRS is an enhancement to GSM networks and provides packet data
transmission. The connection setup is fast and, once connected, applications
may send and receive data whenever required.
C5621 and C33 are using GPRS with Multislot class 10, which enables
communication speed up to 100/60 kbps (DL/UL).
2.1.2.2 EDGE
EDGE (Enhanced Data rates for Global Evolution) is an integral part of the
GSM family of open mobile standards. EDGE improves GPRS by increasing
data throughput by a factor of three. GPRS networks enhanced with EDGE
are often referred to as E-GPRS (Enhanced GPRS) networks.
C5621 and C33 are using E-GPRS with Multislot class 10, which enables
communication speeds up to 296/177.6 kbps (DL/UL).
2.2 Core features
2.2.1 Browsing and Internet access
C5621 and C33 provide a standard Internet connection. It is possible to use
the Internet or intranet with a generic browser.
2.2.2 SMS
C5621 and C33 can send and receive text messages. Facilities such as copy
and paste make it fast and easy to send information via text messages from a
computer. The standard maximum length of a text message is 160 characters,
(dependent on character coding), but since concatenation is supported,
messages longer than 160 characters can be sent and received.

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2.2.3 GPS
The Global Positioning System (GPS) gives the positioning information around
the globe and can be used together with the most commonly used positioning
applications. The positioning data from the C5621 module can be used
together will all major positioning applications to, for example, show locations
on maps, trace routes, give information on how to get to a destination, etc.
The product may have GPS function.
C5621 has a built-in standalone GPS receiver with good sensitivity
performance. For increased performance, C5621 supports both network and
Internet assisted GPS, which helps the GPS receiver increase its sensitivity
and perform a faster Time To First Fix (TTFF). There are product variations,
where the GPS is omitted.

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3 Hardware Overview
3.1 General
C5621 and C33 have a form factor of 29 x 29 x 1.9 mm, soldered in board.
The pin out is configured as a 277 pin LGA (Land Grid Array). The ball
diameter is 0.63 mm and the pitch is 1.27 mm. The pin configuration is shown
in the picture below.
4 Routing guidelines
C5621 / C33 Mobile Broadband module is an LGA subassembly, soldered to
the host board, and shares GND plane with the host platform, it is essential
that the host board layout follows the recommendation given in this chapter to
get the best performance out of the module.

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Some of the recommendations provided in this chapter are general PCB
design guideline that may be referred from standard texts concerning the
subject.
4.1 Recommended PCB Footprint
The solder lands of the host PCB should be a mirror image of the 277
Ø ≥0.63 mm solder lands on the component and preferably not routed on the
outer Cu-layer. The pitch is 1.27 mm. Via-in-pad should be Cu-filled (i.e. solid
Cu-microvia).
To improve flux outgassing during reflow, the Solder Mask Opening (SMO) is
recommended to extend 50 µm outside the package outline on all four sides.
Figure 1, Ø 0.63 mm solder lands with one large solder mask opening
extending at least 50 μm outside the package outline on all four
sides
Host PCB Solder Mask
Solder Mask Opening
29.2 mm
29.2 mm

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If solder mask is used on the mother PCB underneath the C5621/C33, it
should be NSMD design with SMO of Ø ≥0.73 mm.
Figure 2, Ø 0.63 mm NSMD solder lands, SMO Ø ≥0.73 mm
4.2 Digital I/O routing
Keep all trace lengths as short as possible
Use stripline structure for signals with high frequency content (on the
module, all 1.8V I/O signals have a rise/fall time of ~1ns, and should
therefore be routed as striplines, since they all are high bandwidth
signals)
Treat all critical (high bandwidth) signals as current loops, and make
sure that they have a return path. This means that you should refrain
from routing any signals over non-continuous power or ground planes,
because this causes interruptions in the impedance and results in
reflections, and might also increase EMI emissions.
Traces routed on adjacent layers should be oriented perpendicular
towards each other; this will reduce risk for crosstalk.
Impedance matching must be maintained to avoid overshoot,
undershoot and ringing. Otherwise, radiated emissions increases.
If nothing else is stated, digital signals should be routed with an
impedance of 50-70 Ohm relative GND.
NSMD Solder lands
Host PCB Solder Mask

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4.2.1 Clock Routing
Must be routed with a controlled impedance (50-60 Ohm)
Should not be routed over a discontinuous GND plane
Keep clock traces as short as possible
Place serial termination close to transmitter output
Crosstalk:
oCrosstalk falls off with the square of the distance, therefore
adequate spacing is a good method in reducing crosstalk
oAs a rule of thumb, 3xH can be used for all clock signals:
Figure 3, Spacing rule
Involved signals:
oSYSCLK
oRTC_CLK
oUIM_CLK
4.2.2 USB Routing
Traces should be routed as a differential pair, matched in length.
Differential Impedance between the traces shall be 90 Ohm
Involved signals:
oUSB_DP
oUSB_DM
H
3xH
Reference plane
Aggressor Victim

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4.3 Power Routing
4.3.1 VBAT Routing
The VBAT pads should have a direct, low impedance connection to a
battery
The decoupling should be placed close to VBAT pads
VBAT net shall be designed such that the supply voltage to the module is
always within its operating range even at the maximum current
consumption (worst case being 2G transmit operation). Refer to chapter
4.3.3.1 for details
4.3.2 GND
On the layers where a power plane is implemented, a cut-out creating a local
GND plane should be implemented. The local plane should be connected to
the complete GND planes with as many vias as possible; this will increase the
thermal coupling.
4.4 RF Routing
RF signals must have a controlled impedance of 50 Ohm
The signals should be directly connected to respective antennas / antenna
connectors
It is important to isolate the RF-lines from any unwanted signal or noise.
RF stripline is a good choice for realization of RF-lines since it provides
good shielding from both radiated and conducted noise. Care must also be
taken to isolate main/diversity/GPS traces with regards to each other.
Via fence around the stripline, creating an embedded RF cage in the PCB,
will improve isolation. Care shall be taken while calculating trace
impedance since via fence placed very close to the RF striplines, may
lower the impedance somewhat.
Via stub should be eliminated or minimized

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5 Production Guideline
5.1 Package type
C5621 / C33 module has ENIG bottom terminations with a LGA design; no
solder mask is present at the underside of the package.
Figure 4, Top view of C5621/C33
5.2 Floor life and dry storage
The CE module should be stored in a dry pack and handled according to
IPC/JEDEC J-STD-033B.1, MSL 3 with bake at:
•125 °C, when supplied on JEDEC tray
•40 °C ≤5% RH when supplied on 44 mm tape and reel
5.3 Screen stencil design
Material: Stainless steel
Thickness: 0.1 mm (~4 mil)
Aperture size: Ø 0.63 mm (277x)
All solder paste deposits should be centered on the PCB.
5.4 Assembly
Pick-up position should be centered on the package topside.
Nozzle Ø: 10-20 mm

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5.5 Reflow soldering
Forced convection soldering in air or N2can be used.
Reflow profile shall be with the stated limits in IPC/JEDEC J-STD-020D.1.
The classification temperature (Tc) is 250 °C1.
1The temperature value is according to the requirements stated in Table 4-2 IPC/JEDEC J-STD-020D.1.

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6 Packaging – Tape and Reel Information
C5621/C33 modules are shipped as tape reels.
Each reel has 724 modules placed into the carrier tape and sealed with the
cover tape. There will be 8 empty pockets as trailer and 18 empty pockets as
leader in each reel.
Figure 5, Reel Direction
724

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1
Label
2
Humidity Indicator
3
Desiccant
4
Shielding Bag
5
Module Orientation Mark
Figure 6, Tape Reel Details
User direction of unreeling
1
C5621/C33
Module
5
2
1
3

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7 SW integration
7.1 Driver and Application Architecture
7.1.1 Windows XP and Vista Architecture
The driver and application architecture for XP and Vista is depicted in Figure
22.
The drivers are based on standard USB functionality. The Mobile Broadband
Module appears as the following devices when examined in Windows Device
Manager:
Device Name
Function
Mobile Broadband Device Management
This port can be used by an application
to control and obtain status from the
Mobile Broadband Module. Port type
WDM
Mobile Broadband Network Adapter
(NDIS)
NDIS interface over which Ethernet
communication can be established.
Appears to Windows as a network
adapter. Port type Ethernet
Mobile Broadband GPS Interface
GPS COM port which streams out
NMEA. Port type ACM
SIM Card Reader (SC)
PC-Smartcard interface. Port type WDM
Wireless Modem
Modem device which may be used for
legacy Dial-Up Networking connection.
Port type ACM.
On top of the drivers is an application, WMCore, running as background
service. The service is started automatically at Windows startup and can be
used to change the state of the Mobile Broadband Module without end-user
interaction also prior to Windows login.
The WMCore service provides a number of functions to control the module
and retrieve information about the module and its states. The functions are
accessible through the Ericsson Mobile Broadband C++ API, see [5]. The
service is also used by Ericsson’s Wireless Manager.