Telit Wireless Solutions GC864-QUAD-C2 Installation manual

GC864-QUAD-C2 / PY-C2
Hardware User Guide
GC864-QUAD-C2 and GC864-PY-C2 Hardware User Guide
1vv0300744 Rev.1 - 24/10/06

GC864-QUAD-C2/PY-C2 Hardware User Guide
1vv0300744 Rev.1 - 24/10/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 2 of 27
This document is relating to the following products:
Model P/N
GC864-QUAD-C2
GC864-PY-C2
3990250681
3990250686

GC864-QUAD-C2/PY-C2 Hardware User Guide
1vv0300744 Rev.1 - 24/10/06
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Contents
1Overview.........................................................................................................................................5
2Mechanical Dimensions..............................................................................................................6
3Board to Board connector PINOUT connections ......................................................................7
4Hardware Commands....................................................................................................................9
4.1 Turning ON the GC864-C2 .....................................................................................................9
4.2 Turning OFF the GC864-C2 .................................................................................................11
4.2.1 Hardware shutdown....................................................................................................................... 11
4.2.2 Hardware Unconditional Restart.................................................................................................... 11
5Power Supply...............................................................................................................................13
6General Design Rules..................................................................................................................14
7Antenna ........................................................................................................................................15
8Serial Port.....................................................................................................................................16
9VAUX1 power output...................................................................................................................17
10 Audio Section Overview..............................................................................................................18
10.1 Audio Lines Characteristics ............................................................................................19
10.1.1 Microphone Paths Characteristic................................................................................................... 19
10.1.2 Ear Paths Characteristics .............................................................................................................. 19
10.2 Microphone Biasing..........................................................................................................20
10.2.1 On-board default biasing ............................................................................................................... 20
10.2.2 External biasing network................................................................................................................ 21
10.3 EVK2: the Evaluation Kit for Telit Modules ....................................................................21
11 SIM Design Guides ......................................................................................................................22
12 General Purpose I/O ....................................................................................................................23
13 DAC and ADC section .................................................................................................................24
14 Conformity Assessment Issues .................................................................................................25
15 SAFETY RECOMMANDATIONS..................................................................................................26
16 Document Change Log ...............................................................................................................27

GC864-QUAD-C2/PY-C2 Hardware User Guide
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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.
© 2006 Telit Communications S.p.A.

GC864-QUAD-C2/PY-C2 Hardware User Guide
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1 Overview
The aim of this document is the description of some hardware solutions useful for developing a
product with the Telit GC864-C2 module.
In this document all the basic functions of a mobile phone will be taken into account; for each one of
them a proper hardware solution will be suggested and eventually the wrong solutions and common
errors to be avoided will be evidenced. Obviously this document cannot embrace the whole hardware
solutions and products that may be designed. The wrong solutions to be avoided shall be considered
as mandatory, while the suggested hardware configurations shall not be considered mandatory,
instead the information given shall be used as a guide and a starting point for properly developing your
product with the Telit GC864-C2 module.
For further hardware details that may not be explained in this document refer to the Telit GC864-C2
Product Description document where all the hardware information is reported.
NOTICE
GC864-C2
GC864
-
C
2
GC864-C2
GC864-C2
GC864
-
C
2
GC864-C2
GC864-C2
The information presented in this document is believed to be accurate and reliable. However, no responsibility is
assumed by Telit Communication S.p.A. for its use, nor any infringement of patents or other rights of third parties
which may result from its use. No license is granted by implication or otherwise under any patent rights of Telit
Communication S.p.A. other than for circuitry embodied in Telit products. This document is subject to change
without notice.

GC864-QUAD-C2/PY-C2 Hardware User Guide
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2 Mechanical Dimensions
The Telit GC864-C2 module overall dimension are:
• Length: 50 mm
• Width: 33 mm
• Thickness: 5.6 mm
• Weight: 14gr

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3 Board to Board connector PINOUT
connections
Pin Signal Type Function
1 VBATT DC voltage Power
2 GND DC voltage Power
3 VBATT DC voltage Power
4 GND DC voltage Power
5 VBATT DC voltage Power
6 GND DC voltage Power
7 VBATT DC voltage Power
8 GND DC voltage Power
9 VBATT DC voltage Power
10 GND DC voltage Power
11 VBATT DC voltage Power
12 GND DC voltage Power
13 NC Don’t connect
14 ON_OFF* DC voltage Input command for switching power ON or OFF
15 SIMVCC DC voltage External SIM Power
16 SIMIN DC voltage External SIM inside detector
17 SIMRST DC voltage External SIM Reset
18 SIMIO 3V Only External SIM Data I/O
19 SIMCLK Digital Signal External SIM Clock
20 DAC_OUT Digital Output Digital/ Analog converter output
21 TGPIO_01 Digital In/Out General purpose
22 TGPIO_02/JDR Digital In/Out General purpose
23 TGPIO_03 Digital In/Out General purpose
24 TGPIO_04 Digital In/Out General purpose
25 VRTC DC voltage VRTC Backup capacitor
26 ADC_IN1 AC input Analog/Digital converter input
27 ADC_IN2 AC input Analog/Digital converter input
28 ADC_IN3 AC input Analog/Digital converter input
29 - - RESERVED
30 - - RESERVED
31 TGPIO_07/BUZZER Digital In/Out General purpose/Buzzer
32 OUT Digital Output General purpose
33 LED DC voltage Status indicator led
34 VAUX1 DC voltage Power output for external accessories
35 TGPIO_05/RFTXMON Digital In/Out General purpose
36 C125/RING Digital Output Output for Ring indicator signal (RI) to DTE
37 C108/DTR Digital Input Input for Data terminal ready signal (DTR) from DTE
38 C109/DCD Digital Output Output for Data carrier detect signal (DCD) to DTE

GC864-QUAD-C2/PY-C2 Hardware User Guide
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39 C105/RTS Digital Input Input for Request to send signal (RTS) from DTE
40 C106/CTS Digital Output Output for Clear to send signal (CTS) to DTE
41 C103/TXD Digital Input Serial data input (TXD) from DTE
42 C104/RXD Digital Output Serial data output to DTE
43 NC Don’t connect
44 NC Don’t connect
45 RX_Trace Digital Input RX Data for debug monitor
46 TX_Trace Digital Output TX Data for debug monitor
47 - - RESERVED
48 - - RESERVED
49 - - RESERVED
50 - - RESERVED
51 - - RESERVED
52 - - RESERVED
53 MIC_MT+ DEC Audio Input Handset microphone signal input; phase+,
54 MIC_MT- DEC Audio Input Handset microphone signal input; phase-,
55 EAR_MT+ Audio Output Handset earphone signal output, phase +
56 EAR_MT- Audio Output Handset earphone signal output, phase -
57 EAR_HF+ DEC Audio Output Handsfree ear output, phase +
58 - - RESERVED
59 MIC_HF+ DEC Audio Input Handsfree microphone input; phase +
60 ANALOG GND AC voltage
For more information about balls position and pinout of GE864
module, please refer to 1vv0300694 GE-864 Hardware User Guide

GC864-QUAD-C2/PY-C2 Hardware User Guide
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4 Hardware Commands
4.1 Turning ON the GC864-C2
To turn on the GC864-C2 the ON# line must be tied low for at least 1 second and then released.
The maximum current that can be drained from the ON# line is 0,1 mA.
A simple circuit to do it is:
NOTE: don't use any pull up resistor on the ON# line, it is internally pulled up. Using pull up resistor may bring to
latch up problems on the GC864-C2 power regulator and improper power on/off of the module. The ON# line must
be connected only in open collector configuration.
NOTE: In this document all the lines that are inverted, hence have active low signals are labeled with a name that
ends with a "#" or with a bar over the name.
ON#
Power ON impulse
GND
R1
R2
Q1

GC864-QUAD-C2/PY-C2 Hardware User Guide
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For example:
1- Let's assume you need to drive the ON# line with a totem pole output of a +3/5 V microcontroller
(uP_OUT1):
1s
2- Let's assume you need to drive directly the ON# line inserting the forecast ON/OFF button PL101:

GC864-QUAD-C2/PY-C2 Hardware User Guide
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4.2 Turning OFF the GC864-C2
The turning off of the device can be done in three ways:
• by software command (refer to 1vv0300745 Rev1 GC864-QUAD-C2 / PY-C2 Software User
Guide)
• by hardware shutdown
• by Hardware Unconditional Restart
When the device is shut down by software command or by hardware shutdown, it issues to the
network a detach request that informs the network that the device will not be reachable any more.
4.2.1 Hardware shutdown
To turn OFF the module GC864-C2 the ON# line (pin2-PL101/pin14-PL103) must be tied low for at
least 2 seconds and then released.
The same circuitry and timing for the power on shall be used.
4.2.2 Hardware Unconditional Restart
The device shuts down after the release of the ON# pad.
To unconditionally restart the module GC864-C2, the RESET# line (pin2-PL102) must be tied low for
at least 200 milliseconds and then released.
The maximum current that can be drained from the RESET# line is 0,15 mA.
A simple circuit to do it is:
RESET#
Unconditional Restart
impulse
GND

GC864-QUAD-C2/PY-C2 Hardware User Guide
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NOTE: don't use any pull up resistor on the RESET# line nor any totem pole digital output. Using pull up resistor
may bring to latch up problems on the GC864-C2 power regulator and improper functioning of the module. The
RESET# line must be connected only in open collector configuration.
TIP: The unconditional hardware Restart should be always implemented on the boards and software should use it
as an emergency exit procedure.
For example:
1- Let's assume you need to drive the RESET# line with a totem pole output of a +3/5 V
microcontroller (uP_OUT2):
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.

GC864-QUAD-C2/PY-C2 Hardware User Guide
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5 Power Supply
The power supply circuitry and board layout are a very important part in the full product design and
they strongly reflect on the product overall performances, hence read carefully the requirements and
the guidelines that will follow for a proper design.
For more information please refer to 1vv0300694 GE864 Hardware User Guide

GC864-QUAD-C2/PY-C2 Hardware User Guide
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6 General Design Rules
The principal guidelines for the Power Supply Design embrace three different design steps:
- electrical design
- thermal design
- PCB layout.
For more information about Electrical Design, Thermal Design, Power Supply PCB layout, please refer
to 1vv0300694 GE864 Hardware User Guide.

GC864-QUAD-C2/PY-C2 Hardware User Guide
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7 Antenna
The antenna connection and board layout design are the most important part in the full product design
and they strongly reflect on the product overall performances, hence read carefully and follow the
requirements and the guidelines for a proper design.
For more information about GSM Antenna Requirements, PCB line and Installation Guidelines, please
refer to 1vv0300694 GE864 Hardware User Guide.

GC864-QUAD-C2/PY-C2 Hardware User Guide
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8 Serial Port
The serial port on the Telit GC864-C2 is the core of the interface between the module and OEM
hardware. Several configurations can be designed for the serial port on the OEM hardware, but the
most common are:
• RS232 PC com port
• microcontroller UART @ 2.8V - 3V (Universal Asynchronous Receive Transmit)
• microcontroller UART@ 5V or other voltages different from 2.8V
For more information about Serial port levels, signals and connections, pinout and level translation
please refer to 1vv0300694 GE864 Hardware User Guide.

GC864-QUAD-C2/PY-C2 Hardware User Guide
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9 VAUX1 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.
For more information about VAUX1 source please refer to 1vv0300694 GE864 Hardware User Guide.

GC864-QUAD-C2/PY-C2 Hardware User Guide
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10 Audio Section Overview
The Base Band Chip of the GC864-C2 Telit Module provides two different audio blocks, both in
transmit (Uplink) and in receive (Downlink) direction as shown in the see picture below:
“MT lines” should be used for handset function,
“HF lines” is suited for hands -free function (car kit).
These two blocks can be active only one at a time, selectable by AXE HW line or by dedicated AT
command.
Keep in mind that MT lines work as Differential Input/Output circuits, while HF lines work as Single
Ended Input/Output circuits. For these reasons they have also different audio characteristics.
0,33mV
+10dB
23mV
rms
3,3mV
365mV
rms
+20dB
8
Fully
Differential
Power Buffers
Mic_HF+Ear_HF+
16
-45dBV/Pa
Mic_MT+
Mic_MT-
E-GOLDLiteAudio Paths
-45dBV/Pa
EXTERNAL
AMPLIFIER
Ear_MT+
Ear_MT-
Differential
Line-Out Drivers
Ear_HF-
Mic_HF-
16/
-12dBFS
50cm
7cm

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10.1 Audio Lines Characteristics
10.1.1 Microphone Paths Characteristic
“Mic_MT” 1st differential microphone path
• line coupling AC
• line type balanced
• coupling capacitor ≥100nF
• differential input resistance 50kΩ
• differential input voltage ≤1,03Vpp (365mVrms)
• microphone nominal sensitivity -45 dBVrms/Pa
• analog gain suggested + 20dB
• echo canceller type handset
“Mic_HF” 2nd single ended microphone path
• line coupling AC
• line type single ended
• coupling capacitor ≥100nF
• differential input resistance 50kΩ
• differential input voltage ≤65mVpp (23mVrms)
• microphone nominal sensitivity -45 dBVrms/Pa
• analog gain suggested +10dB
• echo canceller type car kit hands-free
10.1.2 Ear Paths Characteristics
“Ear_MT” Differential Line-out Drivers Path
• line coupling: DC
• line type: bridged
• output load resistance : ≥14 Ω
• internal output resistance: 4 Ω(typical)
• signal bandwidth: 150 - 4000 Hz @ -3 dB
• max. differential output voltage 1310 mVrms (typ, open circuit)
• differential output voltage 328mVrms /16 Ω@ -12dBFS
• SW volume level step - 2 dB
• number of SW volume steps 10

GC864-QUAD-C2/PY-C2 Hardware User Guide
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“Ear_HF” Power Buffers path
• line coupling: AC
• line type: single ended
• output load resistance : ≥14 Ω
• internal output resistance: 4 Ω( >1,7 Ω)
• signal bandwidth: 150 - 4000 Hz @ -3 dB
• max. single ended output voltage 656 mVrms (typ, open circuit)
• SW volume level step - 2 dB
• number of SW volume steps 10
10.2 Microphone Biasing
The electret microphones usually needs a biasing voltage to work properly.
You can use the on-board circuitry on external biasing network.
10.2.1 On-board default biasing
In order to eliminate the noise coming from the power lines, the microphone bias voltage is obtained
from a voltage source filtered by a capacitor multiply circuit (Q101) and connected through R104/R105
to MIC_MT+ line or R104/R106 to MIC_HF+ line.
The voltage source comes from a dedicated voltage regulator (U102), supplied directly by VBATT.
You can use also the inner VAUX1 source; in this case U102 must be removed and R112 inserted.