Siemens TC35i Terminal User manual

TC35i
Siemens Cellular Engine
Migration from TC35 to
TC35i
Version: V 01.01
DocID: TC35_TC35i_MIG_01_V01.01
Status: Preliminary

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Document Name: Migration from TC35 to TC35i
Version: V01.01
Date: January,29, 2003
DocId: TC35_TC35i_MIG_01_V01.01
Status: Preliminary
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 non-infringement 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
Copying of this document and giving it to others and the use or communication of the contents thereof,
are forbidden without express authority. Offenders are liable to the payment of damages. All rights
reserved in the event of grant of a patent or the registration of a utility model or design.
Copyright © Siemens AG 2003
Trademark notice
MS Windowsis a registered trademark of Microsoft Corporation.

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Contents
1Revision history.............................................................................................................. 5
2General info .................................................................................................................... 6
2.1 How to use this document.......................................................................................6
3Feature migration........................................................................................................... 7
3.1 General description.................................................................................................7
3.2 Certification and standards .....................................................................................8
4Hardware migration........................................................................................................ 9
4.1 Introduction..............................................................................................................9
4.2 Operating Modes...................................................................................................10
4.3 Interface/connectors comparison TC35i/TC35.....................................................11
4.4 Power Supply........................................................................................................12
4.4.1 General......................................................................................................12
4.4.2 Power up / down scenarios.......................................................................13
4.4.3 Automatic shutdown..................................................................................13
4.4.3.1 Temperature dependent shutdown.........................................................13
4.4.4 Battery pack...............................................................................................14
4.5 RTC backup..........................................................................................................15
4.6 Control signals.......................................................................................................15
4.7 Interfaces...............................................................................................................16
4.7.1 Serial Interface...........................................................................................16
4.7.2 SIM card interface......................................................................................16
4.7.3 Antenna Interface.......................................................................................17
4.7.3.1 General....................................................................................................17
4.7.4 Audio Interface...........................................................................................17
4.8 Electrostatic discharge..........................................................................................18
4.9 Mechanical Dimensions........................................................................................18
4.10 Mounting and installation.......................................................................................19
4.11 Terms and Abbreviations ......................................................................................20
5AT-Commands migration ............................................................................................. 22
5.1 General comments................................................................................................22
5.2 List of jointly supported AT-commands.................................................................23
5.2.1 Standard V.25ter AT Commands..............................................................23
5.2.2 AT Commands for FAX.............................................................................24
5.2.3 AT Commands originating from GSM 07.07.............................................25
5.2.4 AT commands originating from GSM 07.05 for SMS................................27
5.2.5 Siemens defined AT commands for enhanced functions.........................31
5.3 List of new AT-Commands ...................................................................................32
5.3.1 AT Commands for SIM Application Toolkit (GSM 11.14)..........................32
5.3.2 AT Commands originating from GSM 07.07.............................................32
5.3.3 Commands from change requests TC/AC/MC35....................................33
5.3.4 New features for TC35i only – misc..........................................................33
5.3.5 Siemens defined AT commands for enhanced functions.........................33
5.4 List of unsupported AT-Commands......................................................................33
5.5 List of AT-Commands for V.25ter compatibility....................................................33

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Figures
Figure 1: RTC supply from capacitor for TC35i.................................................................................15
Figure 2: RTC supply from capacitor for TC35..................................................................................15
Figure 3: TC35 footprint .................................................................................................................18
Figure 4: TC35i footprint ................................................................................................................18
Tables
Table 3-1: General description a)......................................................................................................7
Table 3-2: General description b)......................................................................................................8
Table 4-1: Operating modes...........................................................................................................10
Table 4-2: Host interface PIN assignment - ZIF connector.................................................................11
Table 4-3: Power supply signals.....................................................................................................12
Table 4-4: Power consumption comparison .....................................................................................12
Table 4-5: Maximum ratings and the associated URCs.....................................................................13
Table 4-6: Wake up from SLEEP mode scenarios............................................................................14
Table 4-7: Battery specifications - general.......................................................................................14
Table 4-8: Battery specifications - charging.....................................................................................14
Table 4-9: RS232 – Serial interface.................................................................................................16
Table 4-10: RF interface................................................................................................................17
Table 4-13: Glossary of terms........................................................................................................20
Table 5-1: Standard V.25ter AT commands .....................................................................................23
Table 5-2: AT commands for FAX...................................................................................................24
Table 5-3: AT commands from GSM 07.07......................................................................................25
Table 5-4: AT commands for SMS..................................................................................................27
Table 5-5: Siemens defined AT commands......................................................................................31
Table 5-6: AT commands for SAT...................................................................................................32
Table 5-7: AT commands from GSM 07.07- new..............................................................................32
Table 5-8: AT commands from change requests ..............................................................................33
Table 5-9: New TC35i features........................................................................................................33
Table 5-10: New Siemens defined AT commands.............................................................................33
Table 5-11: V.254ter compatibility commands .................................................................................33

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1 Revision history
Date Author Version Change Comment
021022 LR 00.01 Initial version based on M20T to TC35T migration paper and "Daphne" HW
specification 00/011. Done
021023 LR 00.02 Chapter # 5: AT commands - analysis and breakdown per module Done
021023 NK 00.02 Initial version revision, AT Commands analysis Done
021023 NK 00.03 Chapters # 3.1 – 4: HW Done
021023 LR 00.03 Chapters # 3.1 – 4: HW – revision, Chapter # 2.1: How to use this
document - revision Done
021024 LR 00.03 Chapter # 5: AT-Commands migration – revision, Chapters # 2.1, 5.1,
5.2.1 Done
021024 NK 00.03 Chapters # 4: HW Done
021025 LR 00.03 Chapter # 5.6: AT-Commands reference documents – new, Chapters #
5.2.2, 5.2.3 Done
021025 NK 00.03 Chapters # 4: HW Done
021028 LR 00.03 Chapter # 5.2.4: AT commands originating from GSM 07.05 for SMS Done
021028 NK 00.03 Chapters # 4: HW Done
021029 LR 00.03 Chapter # 5.2.5: Siemens defined AT commands for enhanced functions Done
021029 NK 00.03 Chapters # 3.1 – 4: HW Done
021030 LR 00.03 Chapters # 5.3, 5.4, 5.5, 5.6 Done
021030 NK 00.03 Chapter # 3: Feature migration Done
021104 NK 00.04 Chapter # 4: Hardware migration [all sub chapters] - revision Done
021104 LR 00.04 Chapters [all]: Integration of HW & SW part, additional formatting and
corrections Done
021108 LR 00.05 Chapters [all]: Additional formatting and corrections Done
021108 NK 00.05 Chapter #4: HW - revision, additional content Done
021111 LR 00.05 Chapters [all]: Final formatting and corrections Done
021111 AM 00.05 Chapters [all]: revision Done
021112 AM/NK/LR 00.05 Chapters [all]: revision via telephone conference Done
021112 NK/LR 00.06 Chapters [all]: corrections Done
021112 NK 00.06 Chapters #: 4.6.3, 4.6.3.1, 4.7, 4.10 Done
021112 LR 00.06 Revision and corrections - latest info from TC35i_HD_01_V00.01 included Done
021114 LR 00.07 Additional formatting and corrections Done
021121 LR 00.08 Corrections, new "general notes" chapter Done
021216 NK 00.09 Reducing the document to get a shorter version; additional formatting and
corrections trough the hole document Done
021217 NK 00.09 Reducing the document to get a shorter version; additional formatting and
corrections trough the hole document Done
021219 AM/LR 00.10 Revision, phone conference Done
090103 01.00 Released Done

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2 General info
2.1 How to use this document
The target audiences for this document are all categories of software and hardware
developers, system integrators and expert end-users of SIEMENS GSM wireless modules.
The content applies in particular to current users and developers whose applications are
utilizing SIEMENS TC35/TC37/TC35T for their communications purposes.
The aim of this document is to provide information and offer support in order to facilitate the
transition towards the new generation of SIEMENS wireless modules, namely, TC35i.
Information provided here is based on official technical manuals and released specifications
for TC35 and TC35i. The naming conventions used in this document follow those of source
documentation.
The authors presume the readers are already familiar with the contents of those manuals.
The document presents migration issues in detail using comparison tables between the
modules and covers topics ranging from hardware specifications to AT-command interface.
Technical specifications and interfaces to GSM telecom services are described and
compared in detail as well as all the relevant features. AT-command interface was given
particular attention since it represents the main tool available to developers through which
applications can be controlled. Available commands for both TC35i and TC35T are listed and
classified according to their implementation within each of the modules. Differences in test,
query and execution syntax as well as in available parameters are noted for each command.
Commands are classified in three main groups: jointly supported commands, commands
new with respect to TC35 and TC35 commands not supported by TC35i.

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3 Feature migration
Feature comparison for both modules is introduced in the table below. Only main
specifications are listed.
3.1 General description
Table 3-1: General description a)
Features Parameter TC35 TC35i
Frequency bands: Dual-band EGSM 900, GSM1800
compliant to GSM Phase 2/2+
Output performance: Class 4 (2W) for EGSM900
Class 1 (1W) for GSM1800
GSM Class: small MS
Control: via AT commands
3VSupported SIM card: External SIM card holder has to be connected via SIM interface connector
Phonebook management: SM, FD, LD, MC, RC, ON, ME
Automatic dial on DTR
line activation: not supported supported, via AT%D
3.3V – 5.5V 3.3 – 4.8 VInput voltage range: Automatic shutdown supported
Component mounting: both sides single-side mounted
Dimensions: 54.5 x 36 x 6.85 mm 54,5 x 36 x 3,6
Weight: 18g 10g
Normal operation: (-20°C; +55°C)
Restricted operation: (-29°C; -25°C) & (+55°C; +70°C)
Storage: (-40°C; +85°C)
Temperature conditions:
Automatic shutdown supported: (>+75°C and <-29°C)
ImplementedReal time clock: Pin 30, VDDLP
Needs an external serial resistor
between VDDLP and capacitor /
battery to limit input current.
If application is battery powered,
additional diode(s) are suggested
between VDDLP and VBATT+ (see
Chapter "RTC backup" in your
"TC3x Hardware Interface
Description").
Pin 30, VDDLP
Includes 1kΩresistor on VDDLP
line
between ZIF connector and PSU.
No
external resistor required.
If used in earlier TC35 application,
removing additional diode(s)
between
VDDLP and VBATT+ line is
required.
Timer function: Programmable via AT command
Antenna design: 50Ωantenna interface.
Antenna connectors: GSC coaxial connector
Product Data
Evaluation kit: DSB 35 Support Box
Half Rate (ETS 06.20)
Full Rate (ETS 06.10)
Speech codec:
Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
Audio
Audio interface: 2 x analogue audio interfaces (hands-free, supports echo cancellation)
General Point-to-point MT and MO SMS
SMS Cell Broadcast
Text and PDU mode SMS MO
bulk SMS MO
enhancement: -+CMMS
SMS
SMS storages: SM SM+ME (25 places)
SAT SIM Application Toolkit: -SAT class 3, GSM 11.14 Release 98

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Table 3-2: General description b)
Features Parameter TC35 TC35i
Supported services: 2400 bps (V.22bis)
4800 bps (V.32)
9600 bps (V.32)
14400 bps (V.34)
2400 bps (V.110)
4800 bps (V.110)
9600 bps (V.110)
14400 bps (V.110)
USSD support: supported
Data
Connection element: non-transparent mode
Fax Supported classes: Group 3: Class 1, Class 2
RF interface: GSC antenna connector onlyExternal
interfaces Application interface: 40-pin ZIF connector
Baud rate: Fixed range
(300bps...115kbps)
Autobauding
(1.2kbps...115kbps)
Fixed range (300bps...230kbps)
Autobauding (1.2kbps...230kbps)
Local character framing: 8N1 - fixed 7E1, 7O1, 8E1, 8N1, 8O1, 7E2, 7O2,
8E2, 8N2, 8O2; via AT command
Multiplex mode: supported, MUX GSM 07.10
Serial interface
Flow control: RTS/CTS hardware handshake and software XON/XOFF flow control.
Software update via RS232 or SIM interface
3.2 Certification and standards
Both TC35 and TC35i comply to the same directives and standards. For further information,
please consult the HW manual.

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4 Hardware migration
This chapter contains information regarding the hardware set-up, installation instructions and
physical properties for both modules. Hardware features are listed in comparison tables
related to power supply, RF, audio, SIM and RS232 serial interfaces with functionality
descriptions. All features, except RF, are available through common host application
interface.
4.1 Introduction
TC35i was intended as a "feature-superset" successor to TC35. It is super-slim, single-side
mounted, compact, dual-band GSM OEM module for integration into industrial or mobile
devices.
TC35i incorporates all the TC35 HW features with following additional features:
æAutomatic dial on DTR line activation
æAutobauding up to 230kbps. Character framing and flow control fully supported
æSingle side mounted
æSM+ME (25 places)
æSAT class 3, GSM 11.14

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4.2 Operating Modes
Various operating modes for TC35 and TC35i modules are listed in the table below. TC35i
module supports four additional sleep modes compared to TC35. For further details please
consult the TC35i manual
The table below shows operating modes overview for both devices
Table 4-1: Operating modes
Mode Function TC35 TC35i
GSM SLEEP Power saving mode set with AT+CFUN
command. Software is active to minimum
extent. If the GSM engine was
registered to the GSM network in IDLE
mode, it is registered and paging in
SLEEP mode, too. AT interface is not
responding.
Software is active to a minimum extent. If the
module was registered to a 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.
GSM IDLE Software is active. Once registered to the GSM network, paging with BTS is carried out.
The module is ready to send and receive.
Normal
operation
GSM 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.
POWER DOWN Operating voltage is applied. Only a voltage regulator in the Power Supply ASIC is active
for powering the RTC. Software is not active. The RS-232 interface is not accessible.
Alarm mode Restricted operation launched by RTC alert function while the module is in Power Down
mode. Module will not be registered to GSM network. Limited number of AT commands is
accessible. If application is battery powered: No charging functionality in Alarm mode.
Charge-only
mode Limited operation for battery powered applications. Enables charging while engine is detached from GSM network. Limited number of AT commands is accessible. There are
several ways to launch Charge-only mode:
æFrom Power Down mode: Connect charger to POWER lines when engine was powered
down by AT^SMSO.
æFrom Normal mode: Connect charger to POWER lines, then enter AT^SMSO.
Charge mode
during normal
operation
Normal operation (SLEEP, IDLE, TALK, DATA) and charging running in parallel. Charge
mode changes to Charge-only mode when the module is powered down before charging
has been completed.

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4.3 Interface/connectors comparison TC35i/TC35
TC35 and TC35i are equipped with a 40-pin 0.5mm pitch ZIF connector that connects to the
cellular application platform. The mentioned ZIF connector is completely the same for both
devices. The host interface incorporates several sub-interfaces described in the following
chapters
TC35 and TC35i are totally PIN compatible. Some off the TC35 signal names were
changed with TC35i but the functionality is completely identical.
Table 4-2: Host interface PIN assignment - ZIF connector
Signal Name
Pin No. Function IO TC35 TC35i
1-5 Power supply IVBATT+ BATT+
6-10 Ground Ground GND GND
11-12 Charger IPOWER POWER
13 External supply voltage OVDD VDD
14 Battery Temperature IAKKU_TEMP BATT_TEMP
15 Ignition I/IGT IGT
16 RS232 ODSR0 DSR0
17 RS232 O/RING RING0
18 RS232 ORxD0 RxD0
19 RS232 ITxD0 TxD0
20 RS232 OCTS0 CTS0
21 RS232 IRTS0 RTS0
22 RS232 IDTR0 DTR0
23 RS232 0DCD0 DCD0
24 SIM ICCIN CCIN
25 SIM OCCRST CCRST
26 SIM IO CCIO CCIO
27 SIM OCCCLK CCCLK
28 SIM OCCVCC CCVCC
29 SIM Ground CCGND CCGND
30 RTC Backup OVDDLP VDDLP
31 Power Down I/PD EMERGOFF
32 Synchronization OSYNC SYNC
33 Audio OEPP2 EPP2
34 Audio OEPN2 EPN2
35 Audio OEPP1 EPP1
36 Audio OEPN1 EPN1
37 Audio IMICP1 MICP1
38 Audio IMICN1 MICN1
39 Audio IMICP2 MICP2
40 Audio IMICN2 MICN2

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4.4 Power Supply
4.4.1 General
TC35 and TC35i need to connect the power supply to the ZIF connector (5 pins each VBATT+
and GND). Power supply has to be a single voltage source at BATT+.
Power Supply ASIC handles all the key functions for supplying power.
The following tables show an overview of main power supply points with TC35 and TC35i
Table 4-3: Power supply signals
General
Feature TC35 TC35i
Input voltage range: Five pins of BATT+ and GND must be
switched in parallel for supply purposes
because peaks of up to 2A may occur.
VI= 3.3V to 5.5V
VI,typ = 4.2V
Inom ˜ 2A, in burst
Five pins of BATT+ and GND must be switched
in parallel for supply purposes because peaks of
up to 3A may occur.
VI= 3.3V to 4.8V
VI,typ= 4.2V
Inom ˜ 2A, in burst
Vout = 2.3V
Rout ≈220k.
Vlow,max = 0.45V @ Iout = 10µA
tlow ≈100ms
Signal: falling edge and hold for tlow
Open drain/collector driver is required to
pull down this pin to power on the GSM
Engine.
RI˜ 100kΩ, CI˜ 1nF
VILmax = 0.5V @ Imax = 20µA
VOpenmax = 2.3V
tlow ≈100ms
Signal: falling edge and hold for tlow
Ignition:
ON ~~~|____|~~~ Active Low ≥100ms
Emergency shutdown:
(Watchdog) Via /PD (pin no. 31)
This line must be driven by an Open Drain
or Open Collector driver.
Emergency shutdown deactivates the
modules power supply.
Signal ~~~|______|~~~ Active Low ≥
3.5s
via EMERGOFF (pin no. 31)
This line must be driven by an Open Drain or
Open Collector driver.
Emergency shutdown deactivates the modules
power supply.
Signal ~~~|______|~~~ Active Low ≥3.2s
Synchronization:
Indication of increased current
consumption during uplink
transmission burst
Vout,low,max = 0.2V @I= 0.1mA
Vout,high,min = 2.25V @I=-0.1mA
Vout,high,max = 2.76V
VOLmax = 0.3V @I = 0.1mA
VOHmin = 2.25V @I = -0.1mA
VOHmax = 2.73V
Power saving: Supported trough AT+CFUN
Functionality levels <fun>=0
Supported trough AT+CFUN
Functionality levels <fun>=0, 5 , 6, 7 and
8
Table 4-4: Power consumption comparison
Power consumption
Device Stand-by Sleep Idle Talk mode at
EGSM900/1800 Talk mode (peak) at EGSM900/1800
TC35 50µA typ 3mA typ 10mA typ 300mA/270mA 1.8A typ
TC35i 50µA typ 3mA typ 25mA 300-400mA 2A typ

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4.4.2 Power up / down scenarios
TC35 and TC35i are fully identical regarding the power up/down scenario with the following
exception:
To actually turn off the TC35i, the emergency shutdown line has to be driven to ground for ≥
3.2s. The TC35 emergency shutdown line needs to be driven to ground for ≥3.5s
For further information please consult the HW manual for TC35 and TC35i.
4.4.3 Automatic shutdown
To ensure proper operation of all assemblies under varying conditions, such as temperature,
input voltage, transmission power etc., TC35 and TC35i features protection elements for
automatic shutdown.
Automatic shutdown takes effect if:
•the TC35/TC35i board is exceeding the critical limits of overtemperature or
undertemperature
•the battery is exceeding the critical limits of overtemperature or undertemperature in a
battery application, undervoltage is detected
•overvoltage is detected.
4.4.3.1 Temperature dependent shutdown
The board temperature is constantly monitored by an internal NTC resistor located on the
PCB. The NTC that detects the battery temperature must be part of the battery pack circuit as
described in the manual. The values detected by NTC resistor are measured directly on the
board and the battery and are therefore, not fully identical with the ambient temperature.
Table 4-5: Maximum ratings and the associated URCs
Sending temperature alert
TC35 TC35i
^SCTM_A: 1 Caution: Tamb of battery between +56°C and +60°C.
^SCTM_B: 1 Caution: Tamb of board between +55°C and +75°C. Caution: Tamb of board between +65°C and
+75°C.
^SCTM_A: -1 Caution: Tamb of battery between -14°C and -18°C.
^SCTM_B: -1 Caution: Tamb of board between –20°C and –25°C. Caution: Tamb of board between –25°C and –
29°C.
^SCTM_A: 0 Battery back to uncritical temperature range
^SCTM_B: 0 Board back to uncritical temperature range.
Automatic shutdown (URC appears no matter whether or not presentation was enabled)
^SCTM_A: 2 Alert: Tamb of battery >60°C. TC35 switches off
immediately.
^SCTM_B: 2 Alert: Tamb of board >70°C. TC35 switches off
immediately. Alert: Tamb of board >75°C. TC35iswitches off immediately.
^SCTM_A: -2 Alert: Tamb of battery < -18°C. TC35 switches off
immediately

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^SCTM_B: -2 Alert: Tamb of board <-25°C. TC35iswitches off
immediately. Alert: Tamb of board <-29°C. TC35iswitches off immediately.
The table below shows which conditions will wake up TC35 and TC35i from sleep mode
As it can be seen from the following table TC35i supports four sleep modes (5,6,7,8)
more then TC35.
Table 4-6: Wake up from SLEEP mode scenarios
AT+CFUN=5 or 6 ⇒
AT+CFUN=1 AT+CFUN=7 or 8 ⇒ AT+CFUN=1Event AT+CFUN=0 ⇒
AT+CFUN=1 TC35i only - (TC35 does not support sleep modes: 5-8)*
TC35 TC35i TC35i
Ignition line No No No
/RTS0 or /RTS1 (falling edge) Yes No No
Unsolicited Result Code (URC) Yes Yes No
Incoming voice or data call Yes Yes No
Any AT command (incl. outgoing voice or
data call, outgoing SMS) Not Possible (UART disabled) No No
Incoming SMS depending on mode
selected by AT+CNMI:
AT+CNMI=0,0
(= default, no indication of received SMS)
AT+CNMI=1,1
(= displays URC upon receipt of SMS)
No
Yes
No
Yes
No
No
RTC alarm Yes Yes No
AT+CFUN=1 Not Possible
(UART disabled) Yes Yes
* TC35i supports SLEEP modes 0, 5, 6, 7 and 8. Different events or commands cause a wake-up from a SLEEP mode. The
detailed descriptions of these modes can be found in respective HID documents.
4.4.4 Battery pack
For some applications the use of a battery pack may be required. TC35 and TC35i can be
powered from a Li-Ion battery:
Table 4-7: Battery specifications - general
General
TC35 TC35i
Supported Charging Technique Trickle charging and processor controlled fast charging
Operating modes SLEEP, IDLE or TALK/DATA mode
Output voltage (for charger) 5.5V...8V (under load)
Charging current Limited to 500mA
Maximum voltage spikes 25V and must not exceed 1ms 15V and must not exceed 1ms
Table 4-8: Battery specifications - charging
Module Battery specification Maximum charging voltage Capacity
TC35 3.6 V 4.2 V 600-800 mAh
TC35i 3.6V 4.2 V max 850 mAh

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4.5 RTC backup
The internal Real Time Clock of is supplied from a dedicated voltage regulator in the power
supply ASIC which is also active when TC35 and TC35i are in POWER DOWN status. Alarm
function is included that allows waking up TC35 and TC35i without logging to the GSM
network.
On the TC35i board a serial resistor is placed next to the VDDLP line in order to limit
the input current of an empty capacitor. This eliminates the need of adding a resistor
as required in applications based on the earlier TC35 module.
On the TC35 board there is no resistor placed on the board and it should be added when
designing the GSM application
Baseband
processor
RTC
PSU
+
BATT+
1k
ZIF
VDDLP
Figure 1: RTC supply from capacitor for TC35i
Figure 2: RTC supply from capacitor for TC35
4.6 Control signals
Input and Output control signals are identical with both TC35 and TC35i device.
For further information please consult the HW manual for TC35 and TC35i.

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4.7 Interfaces
TC35 and TC35i interfaces are compatible. The following chapters shows a detailed
comparison values for each interface. For further information please consult the TC35i HW
manual
4.7.1 Serial Interface
Each device uses the same serial interface type with identical pin positions.
Compared to TC35 module that supports a fixed local character framing format between TA
and TE, the new TC35i device offers various character framing formats specified in the next
table. For further information please consult the AT command migration part of the document
or the TC35i at command specification.
The table below shows a comparison of values for the serial interface with both devices.
Table 4-9: RS232 – Serial interface
RS232 - Serial interface
Feature TC35 TC35i
Type: Serial asynchronous transmitter and receiver conforming to ITU-T RS232 Interchange Circuits DCE.
Signal levels: Vout,low,max = 0.2V @ I = 0.1mA
Vout,high,min = 2.25V @ I = -0.1mA
Vout,high,max = 2.76V
Vin,high,min = 1.95V, Vi,h,max=3.3V
VOLmax = 0.3V @ I = 0.1mA
VOHmin = 2.25V @ I = -0.1mA
VOHmax = 2.73V
VIHmin = 1.95V, VIHmax = 3.45V
Local character framing: fixed to 8 data bits, no parity and 1 stop bit 7E1, 7O1, 8E1, 8N1, 8O1, 7E2, 7O2, 8E2, 8N2,
8O2
Selectable baud rate Fixed range (300bps...115kbps)
Autobauding (1.2kbps...115kbps) Fixed range (300bps...230kbps) Autobauding (1.2kbps…230kbps)
Flow Control RTS0 / CTS0 and/or software flow control via XON / XOFF.
4.7.2 SIM card interface
There are no changes on the integrated SIM interface with TC35 and TC35i.
For further information please consult the HW manual for TC35 and TC35i.

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4.7.3 Antenna Interface
4.7.3.1 General
Both devices TC35 and TC35i use a GSC connector to establish the RF connection to the
host application. The table below shows a RF interface overview for each device.
Table 4-10: RF interface
RF interface - general
Feature TC35 TC35i
Antenna connector: GSC coaxial connector
Interface type: GSM 900/1800
Max RF power: 2W [EGSM900] / 1W [GSM1800]
RF
Input sensitivity @ ARP
BER Class II < 2.4%
Min -104 [EGSM900]
-102 [GSM1800]
-102dBm [EGSM900, GSM1800]
4.7.4 Audio Interface
Both TC35 and TC35i comprise two analogue audio interfaces, each with an analogue
microphone input and an analogue loudspeaker output (see block diagram below).
To suit several types of equipment, there are several audio modes available which can be
selected with the AT^SNFS command. The electrical characteristics of the voiceband part
vary with the audio mode. For example, sending and receiving amplification, sidetone paths,
noise suppression etc. depend on the selected mode and can be set with AT commands
(except for mode 1).
All analogue microphone inputs and loudspeaker outputs are balanced. A power supply for
electret microphones is implemented in both interfaces, too. If not needed, they have to be
decoupled with capacitors.
Detailed instructions on using AT commands are presented in the AT Command Manual.
TC35i only: Independently of the audio mode, analogue interfaces 1 or 2 can be
selected and configured by AT commands.
Characteristics of audio modes
The electrical characteristics of the voiceband part depend on the current audio mode, set
with AT^SNFS command. Voice band characteristics are the same for TC35 and TC35i. For
further details please consult the HW manual.

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4.8 Electrostatic discharge
TC35 and TC35i are identical protected against Electrical Discharge. For additional
information about ESD please consult the actual specification
4.9 Mechanical Dimensions
TC35 and TC35i provide the same type of connectors and mounting holes on the board. The
position of mounting holes is identical as with TC35, as well as the order of external
connectors. The outline mechanical dimensions are identical with both devices except the
high. TC35i is a single side mounted device that makes it much thinner compared to TC35.
Figure 3: TC35 footprint
Figure 4: TC35i footprint
TP GND
TPBATT+

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4.10 Mounting and installation
Appropriate installation and mounting to the host housing / enclosure is essential for reliable
operation of the GSM engine.
TC35i & TC35
The TC35 board provides three mounting holes. To properly mount it to the host device you
can use M1.6 or M1.8 screws plus suitable washers. The maximum diameter of the screw
head, including the washer, must not exceed 4 mm.
To prevent mechanical damage, be careful not to force, bend or twist the GSM engine. Make
sure it is positioned flat against the host device.
Avoid placing the TC35 board tightly to the host device. Instead, it is recommended
to set the spacers between the module and the host device. If your design approach does not
allow for spacers make sure the host device provides an opening for the RF part.
Avoid exerting any pressure on the shielding covers. Contact springs or other components
must not be fastened to the covers. In extreme conditions, you run the risk of short-circuit if
the cover was damaged or distorted due to pressure. Furthermore, the covers must not be
used to apply any solder joints.
For snap-in concept please be aware that the TC35i PCB is thinner then the TC35
PCB

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4.11 Terms and Abbreviations
Table 4-11: Glossary of terms
A/D Analogue-to-Digital Converter
AF Audio Frequency
AFC Automatic Frequency Control
AGC Automatic Gain Control
AMR Adaptive Multi Rate
ARP Antenna Reference Point
ASIC Application Specific Integrated Circuit
BB Baseband
CPU Central Processing Unit
CR Change Request
CTR Common Technical Regulation
DAI Digital Audio Interface
DFC Digital Frequency Centering
DSB Development Support Board
DSP Digital Signal Processor
DSR Data Set Ready
DTR Data Terminal Ready
DTX Discontinuous transmission
EFR Enhanced Full Rate
EMC Electro Magnetic Compatibility
E-GAIM Enhanced GSM Analog Interfacing Module
EGSM Enhanced GSM
ESD Electrostatic Discharge
ESR Equivalent Serial Resistance
ETS European Telecommunication Standard
FE Front End
FFC Flat Flexible Cable
FR Full Rate
GAIM GSM Analogue Interface Module
GMSK Gaussian Minimum Shift Keying
GSC (Type of antenna connector)
GSM Global Standard for Mobile Communications
HR Half Rate
HW Hardware
IC Integrated Circuit
IF Intermediate Frequency
IMEI International Mobile Equipment Identity
I/O Input/Output
ISO International Standards Organization
ITU International Telecommunications Union
LDO Low Drop Out
LFBGA Low-Profile Fine-Pitch Ball Grid Array
Li-Ion Lithium-Ion
LNA Low-Noise Amplifier
LO Local Oscillator
Mbps Mbits per second
MMI Man Machine Interface
MTBF Mean Time Between Failures
NTC Negative Temperature Coefficient
OC Offset Compensation
OTP One Time Programmable
PA(C) Power Amplifier (Control)
PCB Printed Circuit Board
PCM Pulse Code Modulation
PGC Programmable Gain-Controlled Amplifier
PLL Phase Locked Loop
PSU Power Supply Unit
RAM Random Access Memory
RF Radio Frequency
RI Ring Indication
ROM Read-Only Memory
RTC Real-Time Clock
Rx Receive direction
SAW Surface Acoustical Wave Filter