Telit Wireless Solutions GE864 Series, GE864-QUAD, GC864 Series, GC864-PY, GC864-QUAD Product Description
...
Telit GE864 and GC864
Product Description
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80273ST10008A Rev. 3 - 10/02/06
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Telit GE864 and GC864
Product Description
This document is relating to the following products:
Model P/N
GE864-QUAD 3990250651
GE864-PY 3990250650
GC864-QUAD 3990250675
GC864-PY 3990250676
GE864-PY Interface 3990250672
80273ST10008A Rev. 3 - 10/02/06
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
Contents
1 OVERVIEW ..................................................................................................................7
2 GENERAL PRODUCT DESCRIPTION........................................................................9
2.1 Size.......................................................................................................................9
2.1.1 GE864 .............................................................................................................................. 9
2.1.2 GC864 ............................................................................................................................ 10
2.2 Weight ................................................................................................................11
2.3 Environmental requirements............................................................................11
2.3.1 Temperature range......................................................................................................... 11
2.3.2 Vibration Test (non functional)........................................................................................ 11
2.3.3 RoHS compliance........................................................................................................... 11
2.4 Operating Frequency ........................................................................................11
2.5 Transmitter output power.................................................................................12
2.6 Reference sensitivity.........................................................................................12
2.7 Antenna..............................................................................................................12
2.7.1 GC864 Antenna connector ............................................................................................. 13
2.8 SIM card holder support (GC864 only)............................................................13
2.9 Supply voltage...................................................................................................13
2.10 Power consumption..........................................................................................13
2.11 Embodied Battery charger................................................................................13
2.12 User Interface.....................................................................................................14
2.12.1 Speech Coding............................................................................................................ 14
2.12.2 SIM Reader ................................................................................................................. 14
2.12.3 SMS............................................................................................................................. 14
2.12.4 Real Time Clock and Alarm......................................................................................... 15
2.12.5 Data/fax transmission.................................................................................................. 15
2.12.6 Local security management ........................................................................................ 15
2.12.7 Call control .................................................................................................................. 15
2.12.8 Phonebook .................................................................................................................. 15
2.12.9 Characters management............................................................................................. 15
2.12.10 SIM related functions ............................................................................................... 15
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Telit GE864 and GC864
Product Description
2.12.11 Call status indication ................................................................................................ 15
2.12.12 Indication of network service availability .................................................................. 16
2.12.13 Automatic answer (Voice, Data or FAX) .................................................................. 16
2.12.14 Supplementary services (SS)................................................................................... 16
2.12.15 Acoustic signaling .................................................................................................... 16
2.12.16 DTMF tones ............................................................................................................. 17
2.12.17 Buzzer output........................................................................................................... 17
2.12.18 RF Transmission Monitor ......................................................................................... 17
80273ST10008A Rev. 3 - 10/02/06
2.13 Logic level specifications.................................................................................17
2.13.1 Reset signal................................................................................................................. 18
2.14 RTC Bypass out.................................................................................................19
2.15 VAUX power output...........................................................................................19
2.16 Audio levels specifications...............................................................................20
2.17 Camera compatibility (EASY CAMERA) ..........................................................21
2.18 Converters .........................................................................................................21
2.18.1 ADC Converter ............................................................................................................ 21
2.18.2 DAC Converter ............................................................................................................ 21
2.19 Board to Board interface ..................................................................................23
2.19.1 GE864 balls allocation................................................................................................. 23
2.19.2 GE864 BGA balls layout.............................................................................................. 27
2.19.3 GC864 pins allocation ................................................................................................. 28
NOTE: RESERVED pins must not be connected ..........................................................30
2.20 Mounting the GE864 on your Board ................................................................31
2.20.1 General........................................................................................................................ 31
2.20.2 Module finishing & dimensions.................................................................................... 31
2.20.3 Stencil.......................................................................................................................... 31
2.20.4 PCB pad design .......................................................................................................... 31
2.20.5 Solder paste ................................................................................................................ 33
2.20.6 GE864 Solder reflow ................................................................................................... 33
2.21 Mounting the GC864 on your board................................................................. 35
2.22 Packing system .................................................................................................36
2.22.1 GE864 orientation on the tray ..................................................................................... 37
2.22.2 GC864 orientation on the tray ..................................................................................... 38
2.22.3 Moisture sensibility ...................................................................................................... 38
3 EVALUATION KIT......................................................................................................39
3.1 Evaluation Kit description ................................................................................40
3.1.1 Power Supply ................................................................................................................. 40
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Telit GE864 and GC864
Product Description
3.1.2 Serial interface................................................................................................................ 40
3.1.3 Audio .............................................................................................................................. 40
3.1.4 GPIO and Leds............................................................................................................... 40
80273ST10008A Rev. 3 - 10/02/06
4 SERVICE AND FIRMWARE UPDATE.......................................................................41
4.1 Step-by-Step upgrade procedure.....................................................................41
4.2 Update the GE864 firmware on your interface board.....................................43
5 SOFTWARE FEATURES...........................................................................................45
5.1 Enhanced Easy GPRS Extension.....................................................................45
5.1.1 Overview......................................................................................................................... 45
5.1.2 Easy GPRS definition ..................................................................................................... 46
5.1.2.1 Configuring the GPRS access ................................................................................. 46
5.1.2.2 Configuring the embedded TCP/IP stack................................................................. 46
5.1.2.3 Defining the Internet peer to be contacted ............................................................... 46
5.1.2.4 Open the connection with the internet host.............................................................. 47
5.1.2.5 Close the Socket and deactivate the context ........................................................... 47
5.1.3 Enhanced Easy GPRS Outgoing connection ................................................................. 47
5.1.3.1 Configuring the GPRS access ................................................................................. 48
5.1.3.2 Configuring the embedded TCP/IP stack................................................................. 48
5.1.3.3 Defining the Internet peer to be contacted ............................................................... 48
5.1.3.4 Request the GPRS context to be activated.............................................................. 48
5.1.3.5 Open the connection with the internet host.............................................................. 49
5.1.3.6 Close the Socket without deactivating the context................................................... 49
5.1.4 Enhanced Easy GPRS Incoming Connection................................................................. 49
5.1.4.1 Defining the Internet Peer that can contact this device (firewall settings)................ 50
5.1.4.2 Request the socket connection to be opened in listen............................................. 51
5.1.4.3 Receiving connection requests ................................................................................ 51
5.1.4.4 Known limitations ..................................................................................................... 51
5.2 Jammed Detect & Report Extension................................................................52
5.2.1 Overview......................................................................................................................... 52
5.3 Easy Script Extension - Python interpreter.....................................................53
5.3.1 Overview......................................................................................................................... 53
5.3.2 Python 1.5.2+ Copyright Notice...................................................................................... 54
5.3.3 Python implementation description................................................................................. 55
5.3.4 Python core supported features...................................................................................... 56
5.3.5 Python Build-in Custom Modules.................................................................................... 56
5.4 AT Commands...................................................................................................57
6 CONFORMITY ASSESSMENT ISSUES....................................................................63
6.1 GE864-QUAD Conformity Assessment ...........................................................64
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
7 SAFETY RECOMMENDATIONS...............................................................................68
8 GE864 AND GC864 TECHNICAL SUPPORT ...........................................................69
9 LIST OF ACRONYMS................................................................................................70
10 DOCUMENT CHANGE LOG......................................................................................72
DISCLAIMER
The information contained in this document is proprietary information of Telit Communications
S.p.A.
Telit Communications S.p.A. makes every effort to ensure the quality of the information it makes
available. Notwithstanding the foregoing, Telit Communications S.p.A. does not make any warranty
as to the information contained herein, and does not accept any liability for any injury, loss or
damage of any kind incurred by use of or reliance upon the information.
Telit Communications S.p.A. disclaims any and all responsibility for the application of the devices
characterized in this document, and notes that the application of the device must comply with the
safety standards of the applicable country, and where applicable, with the relevant wiring rules.
Telit Communications S.p.A. reserves the right to make modifications, additions and deletions to
this document at any time and without notice.
© 2005 Telit Communications S.p.A.
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
1 Overview
The Telit GE864 and GC864 modules are small, lightweight, low power consumption and RoHS
compliant devices that allow digital communication services wherever a GSM 850, 900, DCS 1800
or PCS 1900 network is present.
The GE864 is a low cost connector-less best solution for medium to high quantity projects.
The GC864 is provided with a 80 pin Molex board to board connector and a 50 Ohm Murata RF
connector.
The GE864-PY and GC864-PY models integrate the “EASY SCRIPT” on top of all other features of
the GE864-QUAD and GC864-QUAD. The PYTHON, is an engine script interpreter, allowing self
controlled operations. With the EASY SCRIPT feature the GE864-PY and GC864-PY become a finite
product, they just needs your script to be run.
All GE864 and GC864 models includes all state-of-the-art features like GPRS Class 10, Voice, Circuit
Switched Data transfer, Fax, Phonebook and SMS support, ‘EASY GPRS’ embedded TCP/IP
stack and ‘EASY CAMERA’ external camera support and battery charging capabilities.
The GE864 and GC864 are specifically designed and developed by Telit for OEM usage and
dedicated to portable data, voice and telematics applications such as:
• Telemetry and Telecontrol (SCADA applications)
• Security systems
• Automated Meter Reading (AMR)
• Vending machines
• POS terminals
• PDAs and Mobile Computing
• Phones and Payphones
• Automotive and Fleet Management applications
• Battery powered applications needing a battery charger
• Return channel for digital broadcasting
• Applications, where the external application processor can be replaced by the
PYTHON engine provided by the GE864-PY or GC864-PY
All four models support the following functionalities
9 EASY GPRS (AT driven embedded TCP/IP protocol stack)
9 EASY CAMERA (AT driven direct connection CAMERA function)
9 EASY SCAN (full GSM frequency scanning)
9 JAMMING DETECT & REPORT (detect the presence of disturbing devices)
From the interface point of view, the GE864 and GC864 provides the following:
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
9 Full RS232 UART, CMOS level (ASC0) interface for AT commands:
- Autobauding from 2.4 up to 57.6 Kbps
- Fixed baud rate up to 115.2 Kbps
9 Two wires RS232, CMOS level (ASC1) for PYTHON debug:
9 SIM card interface, 1.8 / 3 volts with auto-detection, hot insertion
9 21 x GPIO ports (max)
9 3 x A/D converters
9 1 x D/A converter
9 1 x buzzer output
9 1 x vibrator motor driver output
9 1 x single led supply output
In order to meet the competitive OEM and vertical market stringent requirements, Telit supports its
customers with a dedicated
Telit Evaluation Kit EVK2 to help you develop you application;
A Website with all updated information available;
an high level specialist technical support to assist you in your development;
For more updated information concerning product Roadmap and availability, technical
characteristics, commercial and other issues, please check on the Telit website
Products > Modules.
NOTE
module itself.
The Telit modules SW group is continuously working in order to add new features and improve the
overall performances.
The Telit modules are easily upgradeable by the developer using the Telit Flash Programmer.
Furthermore, all the Telit modules have the conformity assessment against R&TTE.
: Some of the performances of the Telit modules depend on SW version installed on the
Support Policy with:
www.telit.com >
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Telit GE864 and GC864
Product Description
2 General Product Description
2.1 Size
2.1.1 GE864
The Telit GE864 module overall dimension are:
• Length: 30 mm
• Width: 30 mm
• Thickness: 2.8 mm
80273ST10008A Rev. 3 - 10/02/06
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Telit GE864 and GC864
Product Description
2.1.2 GC864
The Telit GC864 module overall dimensions are:
• Length: 36.2 mm
• Width: 30 mm
• Thickness: 3.2 mm
80273ST10008A Rev. 3 - 10/02/06
PRELIMINARY
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
2.2 Weight
GE864: 6 gr
GC864: 8 gr. (preliminary)
2.3 Environmental requirements
The Telit GE864 and GC864 modules are compliant with the applicable ETSI reference
documentation GSM 05.05 Release1998.
2.3.1 Temperature range
GE864-QUAD /
GE864-PY
Temperature in normal operating conditions
Temperature in extreme operating conditions*
Temperature in storage conditions
* Temperature exceeding the range of normal operating conditions can affect the sensitivity, the performance and
the MTBF of the module.
–10°C ÷ +55°C
–30°C ÷ +80°C
(preliminary)
–30°C ÷ +85°C
–10°C ÷ +55°C
–30°C ÷ +85°C
GC864-QUAD /
GC864-PY
–30°C ÷ +80°C
(preliminary)
2.3.2 Vibration Test (non functional)
• 10 ÷12Hz ASD = 1.92m 2 /s 3
• 12 ÷ 150Hz –3dB/oct
2.3.3 RoHS compliance
As a part of Telit corporate policy regarding environmental protection, the GE864 and GC864 comply
with the RoHS (Restriction of Hazardous Substances) directive of the European Union.(EU
Directive 2002/95/EG).
2.4 Operating Frequency
The operating frequencies in GSM, DCS, PCS modes are conform to the GSM specifications.
Mode Freq. TX (MHz) Freq. RX (MHz) Channels (ARFC) TX - RX offset
850
E-GSM-900
DCS-1800 1710.2 - 1784.8 1805.2 - 1879.8 512 – 885 95 MHz
PCS-1900 1850.2 - 1909.8 1930.2 - 1989.8 512 - 810 80 MHz
824.2÷848.8 869.2÷893.8 0 ÷ 124 45 MHz
890.0 - 914.8 935.0 - 959.8 0 – 124 45 MHz
880.2 - 889.8 925.2 - 934.8 975 - 1023 45 MHz
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
2.5 Transmitter output power
GSM–850/900
The Telit GE864 and GC864 transceiver modules in GSM–850/900 operating mode are class 4 in
accordance with the specifications which determine the nominal 2W peak RF power (+33dBm) on
50 Ohm.
DCS–1800/PCS–1900
The Telit GE864 and GC864 transceiver modules in DCS–1800/PCS–1900 operating mode are class
1 in accordance with the specifications which determine the nominal 1W peak RF power (+30dBm)
on 50 Ohm.
2.6 Reference sensitivity
GSM–850/900
The sensitivity of the Telit GE864 and GC864 modules according to the specifications for the class 4
GSM 850/900 portable terminals are –107 dBm typical in normal operating conditions.
DCS–1800/PCS–1900
The sensitivity of the Telit GE864 and GC864 module according to the specifications for the class 1
portable terminals DCS-1800/PCS 1900 are –106 dBm typical in normal operating conditions.
2.7 Antenna
The antenna that the customer chooses to use should fulfill the following requirements:
Frequency range
Bandwidth
Gain
Impedance
Input power
VSWR absolute
max
VSWR
recommended
Depending by frequency band(s) provided by
the network operator, the customer shall use
the most suitable antenna for that/those
band(s)
136 MHz in GSM 850/900, 170 MHz in DCS,
140 MHz PCS
> 1.5 dBi
50 ohm
> 2 W peak power
10:1
<= 2:1
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
2.7.1 GC864 Antenna connector
The GC864 module is equipped with a 50 Ohm RF connector from Murata, GSC type P/N MM93292700B.
The counterpart suitable is Murata MXTK92 Type or MXTK88 Type.
Moreover, the GC864 has the antenna pads on the back side of the PCB. This allows the manual
soldering of the coaxial cable directly on the back side of the PCB. However, the soldering is not
an advisable solution for a reliable connection of the antenna.
2.8 SIM card holder support (GC864 only)
The GC864 will have on the back side of the PCB, the necessary pads to manually solder a SIM
card holder. The type of the SIM card holder and its final position is being defined and will be
known soon.
2.9 Supply voltage
The external power supply must be connected to VBATT signal and must fulfill the following
requirements:
• Nominal operating voltage 3.8 V
• Operating voltage range 3.4 V - 4.2 V
Note
: Operating voltage range must never be exceeded; care must be taken in order to fulfill
min/max voltage requirements.
2.10 Power consumption
The typical current consumption of the Telit GE864 and GC864 are:
Power off current (typical)
Stand–by current (GSM Idle) < 4 mA
Operating current in voice ch. 170 mA
Operating current in voice ch. < 270 mA
Operating current in GPRS class 10 < 500 mA
< 26 μA;
rms
rms
±20% @ typical network conditions
1.9 A
rms
@ typical network conditions
rms
@ worst network conditions
peak
2.11 Embodied Battery charger
The battery charger is suited for 3.7V Li-Ion rechargeable battery (suggested capacity 5001000mAH). The Charger needs only a CURRENT LIMITED power source input and charges the
battery directly through VBATT connector pins.
Battery charger input pin CHARGE
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Telit GE864 and GC864
Product Description
Battery pins VBATT, GND
Battery charger input voltage min 5.0 V
Battery charger input voltage typ 5.5 V
Battery charger input voltage max 7.0 V
Battery charger input current max 400mA
Battery type Li-Ion rechargeable
NOTE: If embodied battery charger is used, then a LOW ESR capacitor of at least 100μF must be
mounted in parallel to VBATT pin.
NOTE: when power is supplied to the CHARGE pin, a battery must always be connected to the
VBATT pin of the GE864 / GC864.
80273ST10008A Rev. 3 - 10/02/06
2.12 User Interface
The user interface is managed by AT commands specified on the ITU-T V.250, GSM 07.07 and
07.05 specifications.
2.12.1 Speech Coding
The GE864 and GC864 vocoders support the following rates:
Half Rate
Full rate
Enhanced Full Rate
Adaptive Multi Rate
2.12.2 SIM Reader
The GE864 and GC864 support phase 2 GSM11.14 - SIM 3V volts ONLY with an external SIM
connector. For 5V SIM operation an external level translator can be added.
2.12.3 SMS
The GE864 and GC864 support the following SMS types:
Mobile Terminated (MT) class 0 – 3 with signaling of new incoming SMS, SIM full, SMS
read
Mobile Originated class 0 – 3 with writing, memorize in SIM and sending
Cell Broadcast compatible with CB DRX with signaling of new incoming SMS.
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
2.12.4 Real Time Clock and Alarm
The Telit GE864 and GC864 support the Real Time Clock and Alarm functions through AT
commands, furthermore an alarm output pin (GPIO6) can be configured to indicate the alarm with
a hardware line output.
Furthermore the Voltage Output of the RTC power supply is provided so that a backup capacitor
can be added to increase the RTC autonomy.
2.12.5 Data/fax transmission
The Telit GE864 and GC864 support:
GPRS Class 10, MS Class B
CSD up to 14.4 Kbps
Fax service, Class 1 Group 3
2.12.6 Local security management
With lock of Subscriber Identity module (SIM), and security code request at power–up.
2.12.7 Call control
Call cost control function.
2.12.8 Phonebook
This function allows the storing of the telephone numbers in SIM memory.
The capability depends on SIM version/memory.
2.12.9 Characters management
The Telit GE864 and GC864 supports the IRA characters set (International Reference Alphabet), in
TEXT and PDU mode.
2.12.10 SIM related functions
Activation/deactivation of the numbers stored in phone book FDN, ADN and PINs. Extension at the
PIN2 for the PUK2 insertion capability for lock condition.
2.12.11 Call status indication
The call status indication by AT commands is supported.
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
2.12.12 Indication of network service availability
The STAT_LED pin status shows information on the network service availability and Call status.
The pin is an Open Collector output where it is possible to directly connect a LED to show
information on the network service availability and Call status.
Therefore, the status indicated in the following table is reversed with respect to the pin status.
STAT_LED indications
LED status Device Status
permanently off device off
fast blinking
(period 1s, Ton 0,5s)
slow blinking
(period 3s, Ton 0,3s)
Permanently on a call is active
Net search / Not
registered / turning
off
Registered full
service
2.12.13 Automatic answer (Voice, Data or FAX)
After a specified number of rings, the module will automatically answer with a beep. The user can
set the number of rings by means of the command ATS0=<n>.
2.12.14 Supplementary services (SS)
Call Barring,
Call Forwarding,
Calling Line Identification Presentation (CLIP),
Calling Line Identification Restriction (CLIR),
Call Waiting, other party call Waiting Indication,
Call Hold, other party Hold / Retrieved Indication,
Closed User Group supplementary service (CUG),
Advice of Charge,
Unstructured SS Mobile Originated (MO)
2.12.15 Acoustic signaling
The acoustic signaling of the GE864 and GC864 on the selected acoustic device are the following:
Call waiting;
Ringing tone;
SMS received tone;
Busy tone;
Power on/off tone;
Off Hook dial tone;
Congestion tone;
Connected tone;
Call dropped;
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Telit GE864 and GC864
Product Description
No service tone;
Alarm tone.
80273ST10008A Rev. 3 - 10/02/06
2.12.16 DTMF tones
The DTMF tones are managed by specific AT commands. These tones are generated with AT
commands only during voice calls. The minimum duration of a DTMF tone is 100 ms.
Group high
Group low
697 Hz 1 2 3
770 Hz 4 5 6
852 Hz 7 8 9
941 Hz * 0 #
NOTE
by the network switches on commands sent by the Mobile Station (MS). Thus, the default duration
parameters may vary from network to network. In case that the devices to be controlled by DTMF
are sensitive related to the duration of the tones and timing of the sequences, dedicated
investigations on the parameter settings have to be made.
: The GSM system architecture defines that the audio signal of the DTMF tones is inserted
1209 Hz 1336 Hz 1477 Hz
2.12.17 Buzzer output
The General Purpose I/O pin GPIO7 can be configured to output the BUZZER output signal, with
only an external Mosfet/transistor and a diode a Buzzer can be directly driven.
The ringing tone and the other signaling tones can be redirected to this Buzzer output with a
specific AT command.
2.12.18 RF Transmission Monitor
As alternate function of the GPIO5, the GE864 and GC864 provide the RF transmission monitor.
When the alternate function is activated, the pin of GPIO5 changes to HIGH every time the module
transmits an RF signal and remains HIGH for the duration of the transmission sequence, i.e. it
does not change with every GSM signal burst.
2.13 Logic level specifications
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels.
The following table shows the logic level specifications used in the GE864 and GC864 interface
circuits:
Absolute Maximum Ratings -Not Functional
Parameter Min Max
Input level on any -0.3V +3.75V
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Telit GE864 and GC864
Product Description
digital pin when on
Input voltage on
analog pins when on
-0.3V +3.0 V
80273ST10008A Rev. 3 - 10/02/06
Operating Range - Interface levels (2.8V CMOS)
Level Min Max
Input high level 2.1V 3.3V
Input low level 0V 0.5V
Output high level 2.2V 3.0V
Output low level 0V 0.35V
For 2,0V signals:
Operating Range - Interface levels (2.0V CMOS)
Level Min Max
Input high level 1.6V 3.3V
Input low level 0V 0.4V
Output high level 1,65V 2.2V
Output low level 0V 0.35V
2.13.1 Reset signal
Signal Function I/O GE864 ball GC864 pin
RESET Phone reset I/O A2 54
RESET is used to reset the GE864 and GC864. Whenever this signal is pulled low, the GE864 / GC864
is reset. When the device is reset it stops any operation and after the release of the reset it shuts
down, without doing any detach operation from the network where it is registered to. This behavior
is not a proper shut down because any GSM device is requested to issue a detach request on turn
off. For this reason the Reset signal must not be used to normally shutting down the device, but
only as an emergency exit in the rare case the device remains stuck waiting for some network
response.
The RESET is internally controlled on start-up to achieve always a proper power-on reset
sequence, so there's no need to control this pin on start-up. It may only be used to reset a device
already on that is not responding to any command.
NOTE: do not use this signal to power off the Telit GE864 / GC864 module.
Use the ON_OFF* signal to perform this function or the AT#SHDN command.
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
Reset Signal Operating levels:
Signal Min Max
RESET Input high 2.2V* 3.3V
RESET Input low 0V 0.2V
* this signal is internally pulled up so the pin can be left floating if not used.
If unused, this signal may be left unconnected. If used, then it must always be connected with an
open collector transistor, to allow to the internal circuitry the power on reset and under voltage
lockout functions.
2.14 RTC Bypass out
The VRTC signal brings out the Real Time Clock supply which is separate from the rest of the
digital part, allowing having only RTC going on when all the other parts of the device are off.
To this power output a backup capacitor can be added in order to increase the RTC autonomy
during power off of the battery. NO Devices must be powered from this pin.
2.15 VAUX power output
A regulated power supply output is provided in order to supply small devices from module.
This output is active when the module is ON and goes off when module is shut down.
The operating range characteristics of the supply are:
Operating Range - Vout power supply
Min Typ Max
Output voltage 2.75V 2.85V 2.95V
Output current 100mA
Output bypass capacitor 2.2μF
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
2.16 Audio levels specifications
The audio of the GE864 / GC864 is organized into two main paths:
- internal path (called also MT)
- external path (called also HF)
These two paths are meant respectively for handset and headset/hands-free use. The GE864 /
GC864 has a built in echo canceller and a noise suppressor, tuned separately for the two audio
paths; for the internal path the echo canceller parameters are suited to cancel the echo generated
by a handset, while for the external audio path they are suited for a hands-free use.
For more information on the audio refer to the Hardware User Guide.
The following table reports all the audio level specifications.
Microphone characteristics
Internal audio mic. input External audio mic. input
Line coupling
AC (100nF cond.) AC (100nF cond.)
Line type
Differential input resistance
Line nominal sensitivity 50mV
Max input voltage 360mV
Microphone nominal sensitivity
-45dB
Balanced Balanced
50kΩ 50kΩ
±2dB 3mV
rms
22mV
rms
±2dB / +24dB -45dB
Vrms/Pa
Vrms/Pa
±2dB
rms
rms
±2dB / +10dB
– Analog Gain suggested
Echo canceller type handset Car kit hands free
Speaker characteristics
Internal audio ear. output External audio ear. output
Line coupling DC DC
Line type
Speaker impedance
Minimum load impedance
≥ 16Ω ± 5% @ 1kHz ≥ 16Ω ± 5% @ 1kHz
Bridged Bridged
15Ω 15Ω
Signal bandwidth 150-8000 Hz @ -3dB 150-8000 Hz @ -3dB
Maximum output 1,3 V
1,3 V
rms
rms
Maximum power output
80mW/16Ω 80mW/16Ω
Volume level steps (SW) -2dB -2dB
Number of volume steps (SW) 14 14
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
2.17 Camera compatibility (EASY CAMERA)
The GE864 / GC864 provides a direct support for the camera whose characteristics are the following:
Model: TRANSCHIP TC5747
Technology: CMOS COLOR camera
Max picture size: VGA 640x480 pixels
Output format: JPEG
Sensitivity: 4V/lux-sec (including gain)
The camera will be directly managed by the hardware/software with some interface circuitry,
providing a custom AT command interface to operate with it.
The camera interface requires the pins and GPIOs:
Signal GE864 ball GC864 pin
CAM_SDA D7 36
CAM_SCL C6 35
CAM_CLK F8 44
CAM_ON K11 67
CAM_RST C9 76
When the camera is activated, then these pins are not accessible as GPIO.
The AT commands of the module allows to take a snapshot and successively download it through
the serial line in various formats.
2.18 Converters
2.18.1 ADC Converter
The on board A/D are 11-bit converter. They are able to read a voltage level in the range of 0÷2
volts applied on the ADC pin input, store and convert it into 11 bit word.
Input Voltage range 0 2 Volt
AD conversion - 11 bits
Resolution - < 1 mV
Sampling rate 1 (idle) 60 (on traffic) secs
2.18.2 DAC Converter
The on board DAC is a 10 bit converter, able to generate a analogue value based a specific input
in the range from 0 up to 1023. However, an external low-pass filter is necessary. See the HW
User Guide for the details.
Min Max Units
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Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
Voltage range (filtered) 0 2 Volt
Range 0 1023 Steps
Min Max Units
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