Siemens Cellular Engine
Hardware
Interface
Version:
DocID:
01.05
TC35i T HD v01.05
Description
TC35i Terminal Hardware Interface Description
Confidential / Released
Document Name:
TC35i Terminal Hardware Interface Description
Version: 01.05
Date: 10.07.2003
DocId: TC35i_T_HD_v01.05
Status:
Confidential / Released
General notes
Product is deemed accepted by Recipient and is provided without interface to Recipient´s products.
The Product constitutes pre-release version and code and may be changed substantially before
commercial release. The Product is provided on an “as is” basis only and may contain deficiencies or
inadequacies. The Product is provided without warranty of any kind, express or implied. To the
maximum extent permitted by applicable law, Siemens further disclaims all warranties, including
without limitation any implied warranties of merchantability, fitness for a particular purpose and
noninfringement of third-party rights. The entire risk arising out of the use or performance of the
Product and documentation remains with Recipient. This Product is not intended for use in life support
appliances, devices or systems where a malfunction of the product can reasonably be expected to
result in personal injury. Applications incorporating the described product must be designed to be in
accordance with the technical specifications provided in these guidelines. Failure to comply with any of
the required procedures can result in malfunctions or serious discrepancies in results. Furthermore, all
safety instructions regarding the use of mobile technical systems, including GSM products, which also
apply to cellular phones must be followed. Siemens AG customers using or selling this product for use
in any applications do so at their own risk and agree to fully indemnify Siemens for any damages
resulting from illegal use or resale .To the maximum extent permitted by applicable law, in no event
shall Siemens or its suppliers be liable for any consequential, incidental, direct, indirect, punitive or
other damages whatsoever (including, without limitation, damages for loss of business profits,
business interruption, loss of business information or data, or other pecuniary loss) arising out the use
of or inability to use the Product, even if Siemens has been advised of the possibility of such damages.
Subject to change without notice at any time.
Copyright notice
Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its
contents and communication thereof to others without express authorization are prohibited. Offenders
will be held liable for payment of damages. All rights created by patent grant or registration of a utility
model or design patent are reserved.
Copyright © Siemens AG 2003
Trademark notice
MS Windows
â
is a registered trademark of Microsoft Corporation.
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Contents
0 Document history....................................................................................................... 5
1 Introduction ................................................................................................................ 6
1.1 References ......................................................................................................... 6
1.2 Standards ........................................................................................................... 7
1.3 Safety precautions .............................................................................................. 8
1.4 Terms and abbreviations....................................................................................10
2 Key features of TC35i Terminal................................................................................12
3 Interface description.................................................................................................13
3.1 Overview............................................................................................................13
3.2 Block diagram of a GSM application ..................................................................14
3.3 The TC35i GSM engine .....................................................................................15
3.4 Operating modes ...............................................................................................16
3.5 Terminal circuit...................................................................................................17
3.5.1 Power supply and On/Off control ............................................................18
3.5.1.1 Maximum number of turn/on & turn/off cycles ......................................19
3.5.2 RTC........................................................................................................20
3.6 Upgrading TC35i Terminal firmware ..................................................................20
3.6.1 RS-232 interface.....................................................................................20
3.6.2 Audio interface........................................................................................22
3.6.3 Radio interface .......................................................................................25
3.6.4 SIM interface ..........................................................................................26
3.6.5 Status LED .............................................................................................26
4 Mechanical characteristics and mounting advice ..................................................27
4.1 Attaching the terminal ........................................................................................28
5 Electrical and environmental characteristics..........................................................29
6 Full type approval......................................................................................................35
6.1 Restrictions ........................................................................................................36
6.2 CE Conformity....................................................................................................36
6.3 EMC...................................................................................................................36
7 List of parts and recommended accessories..........................................................37
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Figures
Figure 1: Block diagram of a TC35i Terminal application (example).....................................14
Figure 2: TC35i GSM engine................................................................................................15
Figure 3: TC35i Terminal circuit block diagram ....................................................................17
Figure 4: Female 6-pole Western plug for power supply, ignition, power down ....................18
Figure 5: Pin assignment RS-232 (D-Sub 9-pole female).....................................................20
Figure 6: Audio Western plug (4-pole female)......................................................................22
Figure 7: Audio block diagram..............................................................................................22
Figure 8: Antenna connector circuit on TC35i module..........................................................25
Figure 9: Recommended antenna connector........................................................................25
Figure 10: Design drawing ...................................................................................................27
Figure 11: Recommended screws........................................................................................28
Figure 12: Attaching TC35i Terminal onto a top-hat rail .......................................................28
Figure 13: Reference equipment for approval ......................................................................35
Tables
Table 1: Terms and abbreviations ........................................................................................10
Table 2: Key features ...........................................................................................................12
Table 3: Overview of operating modes.................................................................................16
Table 4: Female 6-pole Western plug for power supply, ignition, power down .....................19
Table 5: 9-pole D-Sub (female) RS-232 ...............................................................................21
Table 6: Audio modes ..........................................................................................................23
Table 7: Coding of the green status LED .............................................................................26
Table 8: Mechanical characteristics......................................................................................27
Table 9: Absolute maximum ratings .....................................................................................29
Table 10: Operating conditions.............................................................................................29
Table 11: Characteristics power supply................................................................................30
Table 12: Characteristics (requirements) On/Off control lines ..............................................31
Table 13: Characteristics (requirements) RS-232 interface..................................................31
Table 14: Characteristics (requirements) audio interface .....................................................32
Table 15: AT adjustable parameters ....................................................................................33
Table 16: Air interface ..........................................................................................................34
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0 Document history
Preceding document: "TC35i Terminal Hardware Interface Description" Version 00.40
New document: "TC35i Terminal Hardware Interface Description" Version 01.05
Chapter Page What is new
0 6 Added Application Note 24: Application Developers’ Guide
1.2, 7 6, 37 TC35i Terminal now fully type approved and labeled with CE mark
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1 Introduction
This document describes the hardware of the Siemens TC35i Terminal. The information are
intended for users, developers or manufacturers who design and build cellular applications
beyond the standard setup. The scope of this document includes interface specifications,
electrical issues and mechanical characteristics of TC35i Terminal. It specifies standards
pertaining to wireless applications and outlines requirements that must be adhered to for
successful product design. The TC35i Terminal is a compact GSM modem for the transfer of
data, voice, SMS and faxes in GSM networks. Industrial standard interfaces and an
integrated SIM card reader allow using TC35i Terminal easily as a dual band GSM terminal.
The functionality of the Terminal corresponds to the features of the TC35i module.
1.1 References
[1] TC35i AT Command Set for TC35i and TC35i Terminal, Version 01.05
[2] Release Note, Version 01.05
[3] Application Note 16: Upgrading TC35i Terminal firmware
[4] Application Note 02: Audio Interface Design
[5] Application Note 24: Application Developers’ Guide
[6] Remote Sat User’s Guide
[7] Multiplexer User’s Guide
[8] Multiplexer Driver Developer’s Guide for Windows 2000 and Windows XP
[9] Multiplexer Driver Installation Guide for Windows 2000 and Windows XP
Prior to using the GSM engine, be sure to carefully read and understand the latest product
information provided in the Release Notes.
To visit the Siemens Website you can use the following link:
http://www.siemens.com/wm
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1.2 Standards
TC35i Terminal has been approved to comply with the directives and standards listed below
and is labeled with the CE conformity mark.
Directives
99/05/EC Directive of the European Parliament and of the council of 9 March
1999 on radio equipment and telecommunications terminal
equipment and the mutual recognition of their conformity, in short
referred to as R&TTE Directive 1999/5/EC
89/336/EC Directive on electromagnetic compatibility
73/23/EC Directive on electrical equipment designed for use within certain
voltage limits (Low Voltage Directive)
95/54/EC Automotive EMC Directive
Standards of type approval
ETS 300 607-1 Digital cellular telecommunications system (Phase 2);
Mobile Station (MS) conformance specification;
(equal GSM 11.10-1=>equal 3GPP TS 51.010-1)
EN 301 511 V7.0.1 (2000-12) Candidate Harmonized European Standard
(Telecommunications series) Global System for Mobile
communications (GSM); Harmonized standard for mobile stations in
the GSM 900 and DCS 1800 bands covering essential requirements
under article 3.2 of the R&TTE directive (1999/5/EC) (GSM 13.11
version 7.0.1 Release 1998)
EN 301 489-7 V1.1.1 (2000-09) Candidate Harmonized European Standard
(Telecommunications series) Electro Magnetic Compatibility and
Radio spectrum Matters (ERM); Electro Magnetic Compatibility
(EMC) standard for radio equipment and services; Part 7: Specific
conditions for mobile and portable radio and ancillary equipment of
digital cellular radio telecommunications systems (GSM and DCS)
EN 60 950 Safety of information technology equipment (2000)
Requirements of quality
IEC 60068 Environmental testing
DIN EN 60529 IP codes
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1.3 Safety precautions
The following safety precautions must be observed during all phases of the operation,
usage, service or repair of any cellular terminal or mobile incorporating TC35i Terminal.
Manufacturers of the cellular terminal are advised to convey the following safety information
to users and operating personnel and to incorporate these guidelines into all manuals
supplied with the product. Failure to comply with these precautions violates safety standards
of design, manufacture and intended use of the product. Siemens AG assumes no liability
for customer failure to comply with these precautions.
When in a hospital or other health care facility, observe the restrictions on the
use of mobiles. Switch the cellular terminal or mobile off, if instructed to do so
by the guidelines posted in sensitive areas. Medical equipment may be
sensitive to RF energy.
The operation of cardiac pacemakers, other implanted medical equipment
and hearing aids can be affected by interference from cellular terminals or
mobiles placed close to the device. If in doubt about potential danger, contact
the physician or the manufacturer of the device to verify that the equipment is
properly shielded. Pacemaker patients are advised to keep their hand-held
mobile away from the pacemaker, while it is on.
Switch off the cellular terminal or mobile before boarding an aircraft. Make
sure it cannot be switched on inadvertently. The operation of wireless
appliances in an aircraft is forbidden to prevent interference with
communications systems. Failure to observe these instructions may lead to
the suspension or denial of cellular services to the offender, legal action, or
both.
Do not operate the cellular terminal or mobile in the presence of flammable
gases or fumes. Switch off the cellular terminal when you are near petrol
stations, fuel depots, chemical plants or where blasting operations are in
progress. Operation of any electrical equipment in potentially explosive
atmospheres can constitute a safety hazard.
Your cellular terminal or mobile receives and transmits radio frequency
energy while switched on. Remember that interference can occur if it is used
close to TV sets, radios, computers or inadequately shielded equipment.
Follow any special regulations and always switch off the cellular terminal or
mobile wherever forbidden, or when you suspect that it may cause
interference or danger.
Road safety comes first! Do not use a hand-held cellular terminal or mobile
when driving a vehicle, unless it is securely mounted in a holder for handsfree
operation. Before making a call with a hand-held terminal or mobile, park the
vehicle.
Handsfree devices must be installed by qualified personnel. Faulty installation
or operation can constitute a safety hazard.
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IMPORTANT!
SOS
Cellular terminals or mobiles operate using radio signals and cellular
networks cannot be guaranteed to connect in all conditions. Therefore, you
should never rely solely upon any wireless device for essential
communications, for example emergency calls.
Remember, in order to make or receive calls, the cellular terminal or mobile
must be switched on and in a service area with adequate cellular signal
strength.
Some networks do not allow for emergency calls if certain network services
or phone features are in use (e.g. lock functions, fixed dialling etc.). You may
need to deactivate those features before you can make an emergency call.
Some networks require that a valid SIM card be properly inserted in the
cellular terminal or mobile.
If a power supply unit is used to supply the device, it must meet the demands
placed on SELV circuits in accordance with EN60950. The maximum
permissible connection length between the device and the supply source
should not exceed 3m.
According to the guidelines for human exposure to radio frequency energy,
an antenna connected to the FME jack of the device should be placed at
least 20cm away from human bodies.
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1.4 Terms and abbreviations
Table 1: Terms and abbreviations
Abbreviation Description
ADC Analog-to-Digital Converter
ARP Antenna Reference Point
ASIC Application Specific Integrated Circuit
ATC AT Cellular
BTS Base Transceiver Station
CB Cell Broadcast
CODEC Coder-Decoder
CPU Central Processing Unit
DCE Data Circuit terminating Equipment
DSB Development Support Box
DSP Digital Signal Processor
DSR Data Set Ready
DTR Data Terminal Ready
EFR Enhanced Full Rate
EGSM Enhanced GSM
EMC Electromagnetic Compatibility
ESD Electrostatic Discharge
ETS European Telecommunication Standard
FDMA Frequency Division Multiple Access
FR Full rate
G.C.F. GSM Conformity Forum
GSM Global Standard for Mobile Communication
HF Hands-free
HR Half rate
HW Hardware
IC Integrated Circuit
IF Intermediate Frequency
IMEI International Mobile Equipment Identifier
I/O Input/ Output
IGT Ignition
ISO International Standards Organization
ITU International Telecommunications Union
kbps kbits per second
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Abbreviation Description
Li-Ion Lithium-Ion
LVD Low voltage Directive
Mbps Mbits per second
MMI Machine Machine Interface
MO Mobile Originated
MS Mobile Station
MT Mobile Terminated
NC Not Connected
NTC Negative Temperature Coefficient
PA Power Amplifier
PCB Printed Circuit Board
PCM Pulse Code Modulation
PCS Personal Communication System
PD Power Down
PDU Protocol Data Unit
R&TTE Radio and Telecommunication Terminal Equipment
RAM Random Access Memory
RF Radio frequency
RI Ring Indication
ROM Read Only Memory
RX Receive direction
SIM Subscriber Identification Module
SMS Short Message Service
SRAM Static Random Access Memory
SW Software
TBD To Be Defined
TDD Time Division Duplex
TDMA Time Division Multiple Access
TX Transmit direction
UART Universal Asynchronous Receiver and Transmitter
VAD Voice Activity Detection
ZIF Zero Insertion Force
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2 Key features of TC35i Terminal
Table 2: Key features
Feature Implementation
Transmission Voice, Data, SMS, Fax
Power supply Single supply voltage 8V to 30V
GSM class Small MS
Frequency bands
Transmit power
SIM card reader Internal
External antenna Connected via antenna FME connector
Speech codec Triple rate codec:
SMS MT, MO, CB, Text and PDU mode
DATA 2.4, 4.8, 9.6, 14.4 kbps, non-transparent, V.110
FAX Group 3: Class 1, Class 2
Audio interface Analog (Microphone, Earpiece)
Serial interface
· Dual Band E-GSM 900 and GSM 1800
· Compliant to GSM Phase 2/2+
· Class 4 (2W) for EGSM900
· Class 1 (1W) for GSM1800
· Half Rate (ETS 06.20)
· Full Rate (ETS 06.10)
· Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
Unstructured Supplementary Services Data (USSD) support
· 2.65V level, bi-directional bus for AT commands and data
· Multiplex ability according to GSM 07.10 Multiplexer protocol
· Baud rates from 300bps to 115.200bps
· Autobauding supports: 1.200, 2.400, 4.800, 9.600, 19.200,
38.400, 57.600 and 115.200bps
Supported SIM card 3V
Phonebook management Supported phonebook types: SM, FD, LD, MC, RC, ON, ME
Reset of TC35i Terminal Reset via AT command or Power Down Signal
Firmware upgrade Upgradable via serial interface or SIM interface.
Real time clock Implemented (clock frequency 32.768kHz)
Environmental
Size 65x74x33 mm (approx.)
Weight 130g
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Temperature:
· Normal operation: -20°C to +55°C to +65°C
· Humidity: max. 80 % relative humidity
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3 Interface description
3.1 Overview
TC35i Terminal provides the following connectors for power supply, interfacing and antenna:
· 6-pole Western plug (female) for power supply, ignition, power down signal
· 4-pole Western plug (female) for audio accessory, such as a handset
· 9-pole (female) SUB-D plug for RS-232 serial interface
· FME Jack (male) for antenna (Radio Interface)
· SIM card holder
Status LED
Power supply
Audio interface
SIM card holder
RS-232 interface
Radio interface
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3.2 Block diagram of a GSM application
Figure 1 shows a block diagram of a sample configuration that incorporates a TC35i Terminal
and typical accessories.
Air reference point
GSM Engine TC35i
FFC
(ARP)
LED
Terminal-
circuit
RF interface
RS-232
interface
Power supply
on/off
IGT_IN
PD_IN
Fuse
Antenna
Host
controller
Power
supply
Data
sink/
source
Handset
Module interface
GSM Terminal TC35i T
Audio interface
Customer
application
Figure 1: Block diagram of a TC35i Terminal application (example)
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3.3 The TC35i GSM engine
The TC35i GSM engine is a major functional component of the TC35i Terminal that handles
all the processing for audio, signal and data within a GSM cellular device. Internal software
runs the application interface and the whole GSM protocol stack. A UART forms the
interface to the Terminal Circuit.
A GSM baseband processor contains all analog and digital functionality of a cellular radio.
Designed to meet the increasing demands of the GSM/PCS cellular subscriber market, it
supports FR, HR and EFR speech and channel coding without the need for external
hardware.
The RF part of the GSM engine TC35i is based on a highly integrated single transceiver chip
solution.
The internal antenna cable connects to the connector type GSC from Murata with a 50!
impedance. This GSC connector is the ARP (Antenna Reference Point) for type approval
measurements as well as for electrical characteristics.
Figure 2: TC35i GSM engine
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3.4 Operating modes
The table below briefly summarizes the various operating modes referred to in the following
chapters.
Table 3: Overview of operating modes
Mode Function
Normal operation
Power Down Operating voltage applied. Only a voltage regulator in the Power Supply ASIC
SLEEP Various power saving modes set by AT+CFUN
command.
Software is active to minimum extent. If the Terminal
was registered to the GSM network in IDLE mode, it
remains, in SLEEP mode, registered and pageable
from the BTS.
Power saving can be chosen at different levels. The
NON-CYCLIC SLEEP mode (AT+CFUN=0) disables
the AT interface. The CYCLIC SLEEP mode
AT+CFUN=5, 6, 7 and 8 alternatingly activate and
deactivate the AT interface to allow permanent
access to all AT commands.
IDLE Software is active. Once registered to the GSM
network, paging with BTS is carried out. The
Terminal is ready to send and receive.
TALK Connection between two subscribers is in progress.
Power consumption depends on network coverage
individual settings, such as DTX off/on, FR/EFR/HR,
hopping sequences, antenna.
is active for powering the RTC. Software is not active. The RS-232 interface
is not accessible.
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3.5 Terminal circuit
SIM
card
interface
SIM
LED
GSM status
VPP
2V9
logic
2V9
LED driver
Microphone
supply
VPP
Overvoltage
protection
Voltage
limiter
2V9
BATT+
RS-232 driver
RS-232 interface
Fuse
EMC
(RS-232)
EMC
Audio
(Power down)
EMC (on(off)
(Ignition)
ON/OFF logic
EMC
(Power)
Power supply
Terminal circuit
(Audio)
PD_IN
IGT_IN
Power
DC
9
9 pin
D-Sub
RS-232
interface
Audio
Western jack
(4 pin)
Power supply
Western jack (6 pin)
CCxxx
FFC
SYNC
/RXD0, /TXD0, /RTS0, /CTS0, /DTR0, /DSR0, /DCD0, /RING0
EP1
MIC1
GSM Engine TC35i
GSM interface
/IGT (Ignition)
ZIF connector (40 pole)
/EMERGOFF
/
BATT+
(Main supply)
VDDLP
(Power down supply)
2V9
2V9
2V9
DTR
Power on/off
Power on/off
Regulator
RF interface
GSC (Antenna reference point)
RF cable
Radio interface
FME
50 Ohm
Figure 3: TC35i Terminal circuit block diagram
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3.5.1 Power supply and On/Off control
The power supply of the TC35i Terminal has to be a single voltage source of V
=8V…30V
PLUS
providing a peak current (pulsed 577ms at T=4.615ms) of about 1.1A at 12V during the
active transmission. The uplink burst causes strong ripple (drop) on the power lines. The
drop voltage should not exceed 1V, but the absolute minimum voltage during drops must be
>7.6V. The terminal is protected from supply voltage reversal and overvoltage. An internal
fuse is not removable and intended for electrical safety according to EN60950. To protect
the device from high voltages (>30V) an additional 1.25A quick-break fuse on Pin 1 of the
6-pole Western plug shall be used. In case you wish to use TC35i Terminal with power
packs and batteries observe the EN60950 guidelines.
A switching regulator regulates the input voltage for the internal supply. In POWER DOWN
mode the switching regulator is turned off by the On/Off logic.
A separate voltage regulator supplies the real time clock in the GSM engine.
When power fails for >1ms, TC35i Terminal resets or switches off and for >7s the RTC will
be reset.
3
2
1
4
5
6
Pin assignment:
1 PLUS
2 free
3 PD_IN
4 IGT_IN
5 free
6 GND
Figure 4: Female 6-pole Western plug for power supply, ignition, power down
Mains adapter:
It is recommended to use the adapter of the type approval reference configuration. Ordering
information can be found in Chapter 7. This 12V mains adapter comes with a 6-pole
Western plug and features an internal connection between IGT_IN pin and PLUS pin for
auto ignition (power up).
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Table 4: Female 6-pole Western plug for power supply, ignition, power down
Pin Signal Name Use Parameters
1 PLUS Power supply 8V – 30V DC, max. 33V for 1 min
2 free --- ---
3 PD_IN Signal for power down mode UIH >5V for t > 3.5s to switch the terminal off,
UIL <2V for normal operation
4 IGT_IN Ignition *) UIH >5V
Ignition > 5V for more than 200ms switches
the terminal on
5 free --- ---
6 GND Ground 0V
*)
The ignition is activated only by a rising edge. The rise time is <20ms.
The IGT_IN signal switches the terminal on (it changes from power down state to the net searching state).
Note :
· Power off exception handling: In the event of software hang-ups etc. the TC35i Terminal
can be switched off by applying a voltage >5V to pin 3 (PD_IN) for more than 3.5s.
To switch on again you have two options: Activate the ignition pin (IGT_IN pin 4) or
switch on the RS-232 DTR line, during /PD_IN not active (pin 3 voltage <2V).
The /PD_IN signal switches the terminal off. All internal supply voltages are off, except
for the power down voltage, which still feeds the real-time clock (RTC). See Chapter
3.5.2 for use of the RTC.
· For all other operating modes the /PD_IN signal must be low (<2V).
· When the TC35i Terminal is switched off or enters the Power Down mode, e.g. after you
have issued the AT^SMSO command or activated the /PD_IN signal, all RS-232
interface lines are undefined during internal power shutdown process. This may cause
undefined characters which can be ignored.
· In order to properly shut down the TC35i Terminal be sure to wait 10s after sending
AT^SMSO before switching off the power supply at pin PLUS. This time is needed for
the module to safely log off from the network and finish saving to the internal memory.
Caution: Use the /PD_IN pin only when, due to serious problems, the software is not
responding for more than 5 seconds. Pulling the /PD pin causes the loss of all
information stored in the volatile memory since power is cut off immediately.
Therefore, this procedure is intended only for use in case of emergency, e.g. if
TC35i Terminal fails to shut down properly.
3.5.1.1 Maximum number of turn/on & turn/off cycles
Each time the TC35i Terminal is shut down, data will be written from the volatile memory to
flash memory. The guaranteed maximum number of write cycles is limited to 100.000.
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3.5.2 RTC
The internal Real Time Clock (RTC) of TC35i Terminal is supplied from a dedicated voltage
regulator which is also active when TC35i Terminal is in POWER DOWN mode. The RTC
retains the time and is necessary for the reminder function (even if TC35i Terminal is
disconnected from power supply, see Table 11 for details). For example, you can set an
alarm by using the AT+CALA command. Once the alarm time is reached, a reminder URC
will be returned. See [1] for detailed instructions on use of the command AT+CALA. Please
note that the alarm mode described in [1] is not intended for TC35i Terminal.
It is not recommended to power down TC35i Terminal after setting an alarm, because an
alarm call does not wake up TC35i Terminal from POWER DOWN mode.
3.6 Upgrading TC35i Terminal firmware
The TC35i Terminal firmware can be easily upgraded to the latest firmware releases.
The terminal offers two different solutions for updating firmware. In most cases, you can
update the firmware via the RS-232 interface. In case you wish to use the SIM interface you
will need to purchase a special adapter named BB35 Bootbox. Ordering information can be
found in Chapter 7.
The latest software releases can be obtained from your local Siemens dealer or visit the
Siemens homepage.
3.6.1 RS-232 interface
Via RS-232 interface, the host controller controls the TC35i Terminal and transports data.
1
2
3
4
5
6
7
8
9
Figure 5: Pin assignment RS-232 (D-Sub 9-pole female)
EMC immunity complies with the vehicular environment requirements according to
EN 301 489-7.
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Table 5: 9-pole D-Sub (female) RS-232
Pin no. Signal name I/O Function
1 /DCD O Data Carrier Detected
2 /RXD O Receive Data
3 /TXD I Transmit Data
4 /DTR I Data Terminal Ready
Attention: The ignition of TC35i Terminal is activated via a
rising edge of high potential (+5 ... +15 V)
5 GND - Ground
6 /DSR O Data Set Ready
7 /RTS I Request To Send
8 /CTS O Clear To Send
9 /RI O Ring Indication
The current of all signals is limited by serial resistors:
Outputs: 470 Ohm
Inputs: 1kOhm
TC35i Terminal is designed for use as a DCE. Based on the conventions for DCE-DTE
connections it communicates with the customer application (DTE) using the following
signals:
· Port TxD @ application sends data to TXD of TC35i Terminal
· Port RxD @ application receives data from RXD of TC35i Terminal
The RS-232 interface is implemented as a serial asynchronous transmitter and receiver
conforming to ITU-T V.24 Interchange Circuits DCE. It is configured for 8 data bits, no parity
and 1 stop bit, and can be operated at bit rates from 300bps to 115kbps. Autobauding
supports bit rates from 4.8kbps to 115kbps. Hardware handshake using the /RTS and /CTS
signals and XON/XOFF software flow control are supported.
In addition, the modem control signals /DTR
*)
, /DSR, /DCD and /RING are available. The
modem control signal RING (Ring Indication) can be used to indicate, to the cellular device
application, that a call or Unsolicited Result Code (URC) is received. There are different
modes of operation, which can be set with AT commands.
*)
The /DTR signal will only be polled once per second from the internal firmware
of TC35i.
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6dB-steps
Confidential / Released
3.6.2 Audio interface
The audio interface provides an analog input for a microphone and an analog output for an
earpiece.
· The microphone input and the earpiece output are balanced.
· For electret microphones a supply source is implemented.
· The microphone supply characteristics are optimized for the recommended Votronic
handset. For ordering Information see Chapter 7.
· This handset has been used as the reference handset for type approval. An extra
approval must be obtained for integrating other handsets or amplifiers.
The amplification of sending direction, receiving direction and sidetone depend on the
current audio mode.
EMC immunity complies with the vehicular environment requirements according to
EN 301 489-7.
2
1
3
4
Pin assignment:
1 MICN (Microphone - )
2 EPN (Earpiece)
3 EPP (Earpiece)
4 MICP
(Microphone +)
Figure 6: Audio Western plug (4-pole female)
5.9V
D
(inCalibrate)
-¥...0dB
speechcoder
(sideTone)
MICP
MICN
4k7
4k7
Ri=2k
A
+0..42dB in
(inBbcGain)
EPP
EPN
6R8
6R8
0dB; -6db, 12dB; -18dB
(outBbcGain)
D
A
+
(outCalibrate[n])
n = 0...4
speechdecoder
( ) AT parameter
Figure 7: Audio block diagram
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The audio interface can be configured by AT commands. Please note that the 2nd audio
interface mentioned in [1] is not connected. Audio modes 2, 3 and 6 can be selected by
setting AT^SAIC=2,1,1, for further details refer to [1].
The electrical characteristics of the voiceband part vary with the audio mode. To suit several
types of audio equipment, three audio modes given by default can be selected by the AT
command AT^SNFS, see [1]. In audio mode 4 and 5, the gain in the microphone, earpiece
and the sidetone path can be adjusted from the cellular device application (different volume
steps can be selected by AT commands). See Table 15: AT adjustable parameters for the
characteristics of the audio modes.
Table 6: Audio modes
Mode No
AT^SNFS=
Name Default Handset User Handset Plain Codec 1
Purpose Recommended
Gains programmable via AT
command
Sidetone YES YES YES
Volume control NO YES YES
Limiter (receive) YES YES NO
Echo control (send) Suppression Suppression NO
Noise suppression NO NO NO
MIC input signal for 0dBm0
@ 1024 Hz
(at default gain settings)
Earpiece output signal in mV eff.
@ 0dBm0, 1024 Hz, no load (at
default gain settings);
@ 3.14 dBm0
1 4 5
User provided
handset (see
chapter 6)
NO YES YES
12.5 mV 12.5 mV 315 mV
275 mV 275 mV
handset
default @ max
volume
Direct access to
speech coder
880 mV
3.7 Vpp
Sidetone gain (at default settings) 27.7 dB 27.7 dB -" dB
Speech processing:
The voiceband filter includes a digital interpolation low-pass filter for received voiceband
signals with digital noise shaping and a digital decimation low-pass filter for voiceband
signals to be transmitted.
After voiceband (interpolation) filtering the resulting 2Mbit/s data stream is digital-to-analog
converted and amplified by a programmable gain stage in the voiceband processing part.
The output signal can directly be connected to the earpiece of the GSM cellular device or to
an external handset earpiece (via I/O connector). In the opposite direction the input signal
from the microphone is first amplified by a programmable amplifier. After analog-to-digital
conversion a 2Mbit/s data stream is generated and voiceband (decimation) filtering is
performed.
The resulting speech samples from the voiceband filters are handled by the DSP of the
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baseband controller to calculate e.g. amplifications, sidetone, echo cancellation or noise
suppression.
Full rate, half rate and enhanced full rate, speech and channel encoding including voice
activity detection (VAD) and discontinuous transmission (DTX) and digital GMSK modulation
are also performed on the GSM baseband processor.
Note: With regard to acoustic shock, the cellular application must be designed to avoid
sending false AT commands that might increase the amplification, e.g. for a high
sensitive earpiece.
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3.6.3 Radio interface
An internal antenna cable adapts the antenna reference point (antenna connector type GSC
from Murata) to the FME (male) connector. The position of the antenna reference point can
be seen in Figure 1.
Inside the TC35i module a 27nH inductor to ground provides additional ESD protection to the
antenna connector. For details see Figure 8.
To protect the inductor from damage no DC voltage must be applied to the antenna circuit.
L (27nH)
Figure 8: Antenna connector circuit on TC35i module
TRX In / Output
· Cable loss of internal cable
<0.4dB @ 900MHz
<0.6dB @ 1800MHz
· The system impedance is 50!.
· In every case, for good RF performance the return loss of the customer application
should be better than 10dB (VSWR < 2).
· TC35i Terminal withstands a total mismatch at this connector when transmitting with
power control level for maximum RF Power.
EMC immunity complies with the vehicular environment requirements according to
EN 301 489-7.
For the application it is recommended to use an antenna with the following FME (female)
connector:
GSC connector (from Murata)
Figure 9: Recommended antenna connector
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3.6.4 SIM interface
The SIM interface is intended for 3V SIM cards in
accordance with GSM 11.12 Phase 2. The card holder is
a five wire interface according to GSM 11.11. A sixth pin
has been added to detect whether or not a SIM card is
inserted.
All signals of the SIM interface are protected from
electrostatic discharge with spark gaps to GND and clamp
diodes to 2.9V and GND.
Removing and inserting the SIM card during operation requires the software to be
reinitialized. Therefore, after reinserting the SIM card it is necessary to restart TC35i
Terminal.
Note: No guarantee can be given, nor any liability accepted, if loss of data is encountered
after removing the SIM card during operation.
Also, no guarantee can be given for properly initializing any SIM card that the user
inserts after having removed a SIM card during operation. In this case, the application
must restart TC35i Terminal.
2.
1.
3.6.5 Status LED
A green LED displays the operating status of the
terminal:
Table 7: Coding of the green status LED
Operating status LED
Power Down off
Not registered to the net (missing SIM, PIN, net) fast blinking
Standby (registered to the net) slow flash (75ms On / 3s Off)
Sleep mode (Power save mode, registered to the net) off
Talk mode on
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4 Mechanical characteristics and mounting advice
Table 8: Mechanical characteristics
Weight 130 g
Dimensions (max) LxWxH = 65x74x33mm
Temperature range -20°C to +55 °C
Protection class IP40 (Avoid exposing TC35i Terminal to liquid or moisture, for
example do not use it in a shower or bath.)
Mechanical vibrations Amplitude 7.5 mm at 5-200 Hz sinus
Max. pulse acceleration 30g pulse with 18 ms duration time
Air humidity 5...80% (non condensing)
Class of flammability UL94 HB
Casing material PC/ABS Cycoloy 1200 HF grey 96444
rear front
bottom top
Figure 10: Design drawing
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4.1 Attaching the terminal
The TC35i Terminal can be attached e.g. to a 35mm top-hat rail installation using two
M3 x 50mm screws and an additional fixture element, see Figure 12. In case you wish to
order the recommended mounting kit, please refer to Chapter 7 for detailed information.
Figure 11: Recommended screws
Figure 12: Attaching TC35i Terminal onto a top-
hat rail
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5 Electrical and environmental characteristics
Table 9: Absolute maximum ratings
Parameter Port / Description Min. Max. Unit
Supply voltage PLUS -50 30 V
Overvoltage PLUS / for 1h 33 V
Input voltage for on/off
Control lines
Microphone input line
voltage
Earpiece input voltage EPP, EPN -0.3 +3.3 V
Immunity against discharge
of static electricity
Protection Class IP40 (avoid exposing TC35i Terminal to
Mechanical vibrations
amplitude
Mechanical pulseacceleration
/IGT_IN, /PD_IN -5 30 V
/TXD, /DTR, /RTS -30 +30 V RS-232 input voltage range
/RXD, /CTS, /DSR, /DCD, /RING -0.3 +5.3 V
MICP, MICN -0.3 +10 V
all connectors (lines) -8 +8 kV
IP 40
liquid or moisture, for example do not use it
in a shower or bath)
@ 5-200Hz 7.5 mm
@ 18 ms duration 30 g
Table 10: Operating conditions
Parameter Min Typ Max Unit
Ambient temperature -20 25 55 °C
Supply voltage PLUS
measured at (6-pole)
western jack plug (1 to 6)
7.6 lowest voltage
(minimum peak) incl. all
ripple and drops
12 30 V
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Table 11: Characteristics power supply
Parameter Description Conditions Min Typ Max Unit
V
Allowed voltage ripple
PLUS
(peak-peak), drop
during transmit burst
peak current
Talk Mode, power control
level for P
max 1)
out
1 V
I
PLUS 2)
Average supply current
(average time 3 min.)
Peak supply current
(during 577µs
transmission slot every
4.6ms)
Power Down
mode
SLEEP mode
NET Searching
mode
IDLE mode
TALK mode
(max. current
@GSM 900,
Power Level 5)
Power control
level for Pout
max
@8V 480 550
@12V 700 800
@30V 1750 1850
@8V 45
@12V 30
@30V 17
@8V 70
@12V 50
@30V 30
@8V 60
@12V 45
@30V 25
@8V 270 560
@12V 170 330
@30V 72 125
@8V 1.7 3.2
@12V 1.2 2.4
@30V 0.7 1.2
µA
mA
mA
mA
mA
A
PLUS-Fail
Allowed powerfail time
without terminal reset
After this time the Terminal
will be reset or switched off
1 ms t
or power down
Allowed powerfail time
without RTC (real time
After this time the RTC will
be reset
7 s
clock) reset
t
Allowed rise time of
R_PLUS
LE
Length of supply cable 3 m
Cable
1)
Lowest voltage (minimum peak) incl. all ripple and drops >7.6V including voltage drop, ripple and
V
PLUS
0% to 100% 20 ms
spikes, measured at western jack (6-pole) pin (1 to 6)
2)
Typical values measured with antenna impedance = 50 Ohm (return loss >20dB)
Maximum values measured with mismatched antenna
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Table 12: Characteristics (requirements) On/Off control lines
Parameter Description Conditions Min Typ Max Unit
V
active high 5 V
high
V
low
RIN Input resistance of
Input voltage
/IGT_IN, /PD_IN, /DTR
/IGT_IN, /PD_IN
2 V
47 kOhm
RIN Input resistance of
4 6 8 kOhm
/DTR
t
Duration of active high
D_IGT
200 ms
/IGT_IN, /DTR
t
Duration of active high
D_PD
3.5 s
/PD_IN
t
Rise time /IGT_IN for
R_IGT
0% to 100% 20 ms
power up
t
Rise time /DTR
R_RTS
0% to 100% 20 ms
for power up
t
D_passive
Duration passive (low)
after power down 1 s
of /IGT_IN, /DTR
before restart
Table 13: Characteristics (requirements) RS-232 interface
Parameter Description Conditions Min Typ Max Unit
V
Transmitter Output
OUT
@ 5kOhm load
±5 ±6 ±7
V
Voltage for
/RXD, /CTS, /DSR,
/DCD, /RING
R
Transmitter Output
OUT
770 Ohm
Resistance
/RXD, /CTS, /DSR,
/DCD, /RING
RIN Receiver Input
4 6 8 kOhm
Resistance
/TXD, /RTS, /DTR
V
Input Hysteresis 0.2 0.5 1 V
RIHYS
V
Input Threshold Low 1.0 1.8 V
Ilow
V
Input Threshold High 2.4 3 V
Ihigh
Autobauding 4.8 115 kbps Baudrate
Fixed range 0.300 115 kbps
LE
Length of RS-232 cable 1.8 2 m
Cable
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Table 14: Characteristics (requirements) audio interface
Parameter Min. Typ. Max. Unit
Microphone
MICP, MICN
Earpiece
EPP, EPN
DC (no load) at MICP 5.6 5.9 6.2 V
DC at MICP
0 V
in POWER DOWN
DC (no load) at MICN 0 V
DC Resistance differential
9.3 9.4 9.5 kOhm
MICN, MICP (balanced)
Impedance
1.4 1.5 1.7 kOhm
Zi (balanced)
Input level
U
imax
Gain range
1.03 VPP
0 42 dB
6 dB steps
Frequency Range 300 3400 Hz
fine scaling by DSP (inCalibrate) -" 0 dB
Impedance (audio not active) 30 kOhm
Impedance
15 Ohm
(balanced)
AC output level U
O
3.3 3.7 4.07 VPP
Gain = 0dB @ 3.14 dBm0
no load
audio mode = 5,
outBbcGain = 0,
outCalibrate = 32767
Gain range -18 0 dB
Gain accuracy 0.8 dB
Frequency area 300 3400 Hz
DC Offset
100 mV
(balanced)
Attenuation distortion
1 dB
for 300...3900Hz
Out-of-band discrimination 60 dB
LE
Length of Audio (Handset) cable 3 m
Audio
Unless otherwise stated, all specified values are valid for gain setting (gs) 0dB and 1kHz test
signal.
gs = 0dB means audio mode = 5 for EPP to EPN, inBbcGain= 0, inCalibrate = 32767,
outBbcGain = 0, OutCalibrate = 16384, sideTone = 0.
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Audio Modes:
The electrical characteristics of the voiceband part depend on the current audio mode
selected by the AT command AT^SNFS. See Table 6: Audio modes.
The audio modes 4 and 5 can be adjusted by parameters. Each audio mode is assigned a
separate parameter set.
Table 15: AT adjustable parameters
Parameter Influence to Range Gain range Calculation
inBbcGain MICP/MICN analogue amplifier
gain of baseband controller before
ADC
inCalibrate digital attenuation of input signal
after ADC
outBbcGain EPP/EPN analogue output gain of
baseband controller after DAC
outCalibrate[n]
n = 0...4
sideTone digital attenuation of sidetone
digital attenuation of output signal
after speech decoder, before
summation of sidetone and DAC
present for each volume step[n]
is corrected internally by
outBbcGain to obtain a constant
sidetone independently to output
volume
0...7 0...42dB 6dB steps
0...32767 -"...0dB 20 * log
(inCalibrate/
32768)
0...3 0...-18dB 6dB steps
0...32767 -"...+6dB 20 * log (2 *
outCalibrate[n]/
32768)
0...32767 -"...0dB 20 * log
(sideTone/
32768)
Note: The parameters inCalibrate, outCalibrate and sideTone accept also values from 32768
to 65535. These values are internally truncated to 32767.
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Table 16: Air interface
Parameter Min Typ Max Unit
E-GSM 900 880 915 MHz Frequency range
Uplink (MS ® BTS)
Downlink (BTS ® MS)
RF power @ ARP at 50# load E-GSM 900 30.5 33 35 dBm
GSM 1800 27.5 30 32 dBm
Carrier spacing 200 kHz
Multiplex, Duplex TDMA / FDMA, FDD
Time slots per TDMA frame 8
Time slots usable RX / TX 1 / 1
Frame duration 4.615 ms
Time slot duration 577 µs
Modulation GMSK
Receiver input sensitivity @ ARP
Under all propagation conditions
according to GSM specification
GSM 1800 1710 1785 MHz
E-GSM 900 925 960 MHz Frequency range
GSM 1800 1805 1880 MHz
E-GSM 900 174 Number of carriers
GSM 1800 374
E-GSM 900 45 MHz Duplex spacing
GSM 1800 95 MHz
E-GSM 900 - 102 dBm
GSM 1800 - 102 dBm
E-GSM 900 -107 dBm Receiver input sensitivity @ ARP
BER Class II < 2.4% @ static input level
(no fading)
Length of antenna cable 3 m
GSM 1800 -106 dBm
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A
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6 Full type approval
The Siemens reference setup submitted to type approve TC35i Terminal consists of the
following components:
· TC35i Terminal with approved GSM Engine TC35i
· Votronic Handset type
· PC as MMI
· Power Supply: Mains adapter Sphere Design Type FW7207/12
PC
Power supply
RS-232
Figure 13: Reference equipment for approval
TC35i
Terminal
Handset
For ordering information please refer to Chapter 7.
SIM
RP
ntenna or
50 Ohm
cable to the
system
simulator
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6.1 Restrictions
Later enhancements and modifications beyond the certified configuration require extra
approvals. Each supplementary approval process includes submittal of the technical
documentation as well as testing of the changes made.
· No further approvals are required for customer applications that comply with the
approved TC35i Terminal configuration.
· Extra approval must be obtained for applications using other accessories than those
included in the approved TC35i Terminal configuration (handset, power supply, MMI
implementation supported by AT commands).
6.2 CE Conformity
The TC35i Terminal meets the requirements of the EU directives listed below:
· R&TTE Directive 1999/5/EG
· LVD 73/23/EEC
· EMC conformity in accordance with Directive 89/336/EEC
6.3 EMC
The TC35i Terminal meets EN 301489-7 requirements of equipment for vehicular and fixed
use.
(Note: V
power fail time>1ms resets the terminal)
PLUS
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7 List of parts and recommended accessories
Description Supplier Ordering information
TC35i Terminal Siemens Siemens ordering number
L36880-N8610-A100
Mounting kit for top/hat rail
installation
Sphere
Design
Ordering number: 20100
Sphere Design
Saarpfalz-Park 17
D-66450 Bexbach / Saar
Phone: +49-6826-5200-0
Fax: +49-6826-5200-25
E-Mail: info@spheredesign.de
http://www.spheredesign.de
Power supply unit Sphere
Design
Ordering number: 39001
Sphere Design
Saarpfalz-Park 17
D-66450 Bexbach / Saar
Phone: +49-6826-5200-0
Fax: +49-6826-5200-25
E-Mail: info@spheredesign.de
http://www.spheredesign.de
Handset Votronic Ordering number: HH-SI-30.3/V1.1/0
Votronic GmbH
Saarbrücker Str. 8
D-86386 St. Ingbert
Phone: +49-6894-9255-44
Fax: +49-6894-9255-88
Antenna (900 – 1800 MHz) Märtens Ordering number: various types available
Märtens Systemelektronik GmbH &Co. KG
Kablekamp 2
D-30179 Hannover
Phone: +49-511-674 95 826
Fax: +49-511-63 63 41
E-Mail: mc-gsm-data@t-online.de
http://www.maertens-communication.com
RS-232 cable
(9 pin D-Sub)
Tecline Ordering number: 300574
Tecline
Behrener Str. 8
D-66117 Saarbrücken
Phone: +49-681-926 78-29
Fax: +49-681-926 78-50
BB35 Bootbox Siemens Siemens ordering number:
L36880-N8102-A100
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