Telit Communications S p A GE864QC2 User Manual
GE864-QUAD Hardware User Guide
For GE864-QUAD
1vv0300872 Rev.1 2010-04-02
PRODUCT
GE864-QUAD
APPLICABILITY TABLE
GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
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GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
DISCLAIMER
The information contained in this document is the proprietary information of Telit
Communications S.p.A. and its affiliates (“TELIT”).
The contents are confidential and any disclosure to persons other than the officers,
employees, agents or subcontractors of the owner or licensee of this document,
without the prior written consent of Telit, is strictly prohibited.
Telit makes every effort to ensure the quality of the information it makes available.
Notwithstanding the foregoing, Telit 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 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 reserves the right to make modifications, additions and deletions to this
document due to typographical errors, inaccurate information, or improvements to
programs and/or equipment at any time and without notice.
Such changes will, nevertheless be incorporated into new editions of this document.
Copyright: Transmittal, reproduction, dissemination and/or editing of this document
as well as utilization of its contents and communication thereof to others without
express authorization are prohibited. Offenders will be held liable for payment of
damages. All rights are reserved.
Copyright © Telit Communications S.p.A. 2010
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GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
Contents
APPLICABILITY TABLE ........................................................................................................................................................ 2
1. INTRODUCTION .................................................................................................................................................... 7
1.1. SCOPE .................................................................................................................................................................... 7
1.2. AUDIENCE............................................................................................................................................................... 7
1.3. CONTACT INFORMATION, SUPPORT ............................................................................................................................. 7
1.4. DOCUMENT ORGANIZATION ....................................................................................................................................... 8
1.5. TEXT CONVENTIONS ................................................................................................................................................. 9
1.6. RELATED DOCUMENTS .............................................................................................................................................. 9
1.7. DOCUMENT HISTORY .............................................................................................................................................. 10
2. OVERVIEW .......................................................................................................................................................... 11
3. GE864 MECHANICAL DIMENSIONS ..................................................................................................................... 12
4. GE864 MODULE CONNECTIONS .......................................................................................................................... 13
4.1. PIN-OUT ........................................................................................................................................................... 13
4.1.1. BGA Balls Layout
5. HARDWARE COMMANDS ................................................................................................................................... 19
5.1. TURNING ON THE GE864-QUAD ........................................................................................................................ 19
5.2. TURNING OFF THE GE864-QUAD ...................................................................................................................... 21
5.2.1. Hardware Unconditional Restart
6. POWER SUPPLY .................................................................................................................................................. 25
6.1. POWER SUPPLY REQUIREMENTS ......................................................................................................................... 25
6.2. GENERAL DESIGN RULES .................................................................................................................................... 27
6.2.1. Electrical Design Guidelines
6.2.1.1. +5V input Source Power Supply Design Guidelines ............................................................................................... 27
6.2.1.2. +12V input Source Power Supply Design Guidelines ............................................................................................. 28
6.2.1.3. Battery Source Power Supply Design Guidelines ................................................................................................... 30
6.2.1.4. Battery Charge Control Circuitry Design Guidelines .............................................................................................. 30
6.2.2. Thermal Design Guidelines
6.2.3. Power Supply PCB Layout Guidelines
7. ANTENNA ........................................................................................................................................................... 35
7.1. GSM ANTENNA REQUIREMENTS .......................................................................................................................... 35
7.2. GSM ANTENNA – PCB LINE GUIDELINES ............................................................................................................ 36
7.3. GSM ANTENNA – INSTALLATION GUIDELINES ...................................................................................................... 37
8. LOGIC LEVEL SPECIFICATIONS ............................................................................................................................. 38
................................................................................................................................... 17
........................................................................................................ 22
............................................................................................................... 27
................................................................................................................. 32
................................................................................................ 33
8.1. RESET SIGNAL .................................................................................................................................................... 39
9. SERIAL PORTS ..................................................................................................................................................... 40
9.1. MODEM SERIAL PORT .......................................................................................................................................... 40
9.2. RS232 LEVEL TRANSLATION .............................................................................................................................. 42
9.3. 5V UART LEVEL TRANSLATION........................................................................................................................... 44
10. AUDIO SECTION OVERVIEW ........................................................................................................................... 46
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1.1 SELECTION MODE .......................................................................................................................................................... 46
1.2 ELECTRICAL CHARACTERISTICS .......................................................................................................................................... 48
10.1.1. Input Lines Characteristics
1.2.1 Output Lines Characteristics
11. EXTERNAL SIM HOLDER IMPLEMENTATION ................................................................................................... 51
12. GENERAL PURPOSE I/O .................................................................................................................................. 52
12.1. GPIO LOGIC LEVELS ....................................................................................................................................... 54
12.2. USING A GPIO PAD AS INPUT ........................................................................................................................ 55
12.3. USING A GPIO PAD AS OUTPUT .................................................................................................................... 55
12.4. USING THE RF TRANSMISSION CONTROL GPIO4 .............................................................................................. 55
12.5. USING THE RFTXMON OUTPUT GPIO5 .......................................................................................................... 55
12.6. USING THE ALARM OUTPUT GPIO6 ................................................................................................................. 56
12.7. USING THE BUZZER OUTPUT GPIO7 ................................................................................................................ 57
12.8. MAGNETIC BUZZER CONCEPTS......................................................................................................................... 58
12.8.1. Short Description
12.8.2. Frequency Behavior
.................................................................................................................................. 58
.............................................................................................................................. 59
12.8.3. Power Supply Influence
12.8.4. Working Current Influence
12.9. USING THE TEMPERATURE MONITOR FUNCTION ............................................................................................... 60
12.9.1. Short Description
12.9.2. Allowed GPIO
12.10. INDICATION OF NETWORK SERVICE AVAILABILITY ............................................................................................. 61
12.11. RTC BYPASS OUT ........................................................................................................................................... 62
12.12. VAUX1 POWER OUTPUT ................................................................................................................................. 62
.................................................................................................................................. 60
......................................................................................................................................... 60
................................................................................................................. 48
....................................................................................................................... 49
....................................................................................................................... 59
.................................................................................................................. 59
13. DAC AND ADC SECTION .................................................................................................................................. 63
13.1. DAC CONVERTER ............................................................................................................................................ 63
13.1.1. Description
13.1.2. Enabling DAC
13.1.3. Low Pass Filter Example
13.2. ADC CONVERTER ............................................................................................................................................ 64
13.2.1. Description
13.2.2. Using ADC Converter
14. MOUNTING THE GE864 ON THE BOARD ......................................................................................................... 65
14.1. GENERAL ........................................................................................................................................................ 65
14.1.1. Module Finishing & Dimensions
14.1.2. Recommended Foot Print for the Application (GE864)
14.1.3. Suggested Inhibit Area
14.1.4. Debug of the GE864 in Production
14.1.5. Stencil
14.1.6. PCB Pad Design
14.1.7. Solder Paste
14.1.8. GE864 Solder Reflow
14.2. PACKING SYSTEM ........................................................................................................................................... 71
GE864 Orientation on the Tray
14.2.1. Moisture Sensibility
............................................................................................................................................. 63
.......................................................................................................................................... 63
..................................................................................................................... 64
............................................................................................................................................. 64
............................................................................................................................ 64
......................................................................................................... 65
................................................................... 66
......................................................................................................................... 67
...................................................................................................... 68
..................................................................................................................................................... 68
..................................................................................................................................... 68
........................................................................................................................................... 69
............................................................................................................................ 70
............................................................................................................................. 72
.............................................................................................................................. 73
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15. CONFORMITY ASSESSMENT ISSUES ................................................................................................................ 74
16. SAFETY RECOMMENDATIONS ........................................................................................................................ 76
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1. Introduction
1.1. Scope
The aim of this document is the description of some hardware solutions useful for
developing a product with the Telit GE864-QUAD module.
1.2. Audience
This document is intended for Telit customers, who are integrators, about to
implement their applications using our GE864 modules.
1.3. Contact Information, Support
For general contact, technical support, to report documentation errors and to order
manuals, contact Telit’s Technical Support Center (TTSC) at:
GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
TS-EMEA@telit.com
TS-NORTHAMERICA@telit.com
TS-LATINAMERICA@telit.com
TS-APAC@telit.com
Alternatively, use:
http://www.telit.com/en/products/technical-support-center/contact.php
For detailed information about where you can buy the Telit modules or for
recommendations on accessories and components visit:
http://www.telit.com
To register for product news and announcements or for product questions contact
Telit’s Technical Support Center (TTSC).
Our aim is to make this guide as helpful as possible. Keep us informed of your
comments and suggestions for improvements.
Telit appreciates feedback from the users of our information.
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1.4. Document Organization
This document contains the following chapters:
provides a scope for this document, target audience,
contact and support information, and text conventions.
Ch provides an overview of the document.
864
Chapter 4 864 deals with the pin out configuration and
layout.
How to operate on the module via hardware.
Power supply requirements and general design rules.
The antenna connection and board layout design are the most
important parts in the full product design.
of logic levels for this module.
The serial port on the Telit GE864 is the core of the
interface between the module and OEM hardware
Chip of the GE864 Telit Modules.
How the general purpose I/O pads can be
configured.
Deals with these two kind of converters.
g the GE864 Recommendations and
GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
Specific values adopted in the implementation
Refers to the audio blocks of the Base Band
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1.5. Text Conventions
Danger – This information MUST be followed or catastrophic equipment failure
or bodily injury may occur.
Caution or Warning – Alerts the user to important points about integrating the
module, if these points are not followed, the module and end user equipment
may fail or malfunction.
Tip or Information – Provides advice and suggestions that may be useful when
integrating the module.
GE864-QUAD Hardware User Guide
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All dates are in ISO 8601 format, i.e. YYYY-MM-DD.
1.6. Related Documents
Telit's GSM/GPRS Family Software User Guide, 1vv0300784
Audio settings application note , 80000NT10007a
Digital voice Interface Application Note, 80000NT10004a
GE864 Product description
SIM Holder Design Guides, 80000NT10001a
AT Commands Reference Guide, 80000ST10025a
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RReevviissiioonn
DDaattee
CChhaannggeess
ISSUE#0
2010-01-18
Release First ISSUE# 0
ISSUE#1
2010-04-02
Added FCC documentation
1.7. Document History
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2. Overview
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 GE864-QUAD module. For further
hardware details that may not be explained in this document refer to the Telit GE864QUAD Product Description document where all the hardware information is reported.
GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
NOTICE:
The integration of the GSM/GPRS GE864-QUAD cellular module within user
application shall be done according to the design rules described in this manual.
The information presented in this document is believed to be accurate and reliable.
However, no responsibility is assumed by Telit Communications 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
Communications S.p.A. other than for circuitry embodied in Telit products. This
document is subject to change without notice.
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GE864-QUAD Hardware User Guide
3. GE864 Mechanical Dimensions
The Telit GE864 module overall dimensions are:
Length: 30 mm
Width: 30 mm
Thickness: 2.9 mm
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Ball
Signal
I/O
Function
Internal PULL UP
Type
Audio
H9
EAR_MT-
AO
Handset earphone signal output, phase -
Audio
G10
EAR_MT+
AO
Handset earphone signal output, phase +
Audio
H10
EAR_HF+
AO
Handsfree ear output, phase +
Audio
J10
EAR_HF-
AO
Handsfree ear output, phase -
Audio
J8
MIC_MT+
AI
Handset mic.signal input; phase+
Audio
G9
MIC_MT-
AI
Handset mic.signal input; phase-
Audio
G8
MIC_HF+
AI
Handsfree mic. input; phase +
Audio
J9
MIC_HF-
AI
Handsfree mic.input; phase -
Audio
F9
AXE I Handsfree switching
100K
CMOS 2.8V
SIM card interface
C10
SIMCLK
O
External SIM signal Clock
1,8 / 3V
E9
SIMRST
O
External SIM signal Reset
1,8 / 3V
D10
SIMIO
I/O
External SIM signal Data I/O
1,8 / 3V
C11
SIMIN
I
External SIM signal Presence (active low)
47K
1,8 / 3V
D41
SIMVCC
-
External SIM signal Power supply for the SIM
1,8 / 3V
Trace
D11
TX_TRACE
O
TX Data for debug monitor
CMOS 2.8V
F10
RX_TRACE
I
RX Data for debug monitor
CMOS 2.8V
Prog. / Data + HW Flow Control
E7
C103/TXD
I
Serial data input (TXD) from DTE
CMOS 2.8V
H8
C104/RXD
O
Serial data output to DTE
CMOS 2.8V
B7
C108/DTR
I
Input for Data terminal ready signal (DTR) from
DTE
CMOS 2.8V
F7
C105/RTS
I
Input for Request to send signal (RTS) from
DTE
CMOS 2.8V
F6
C106/CTS
O
Output for Clear to send signal (CTS) to DTE
CMOS 2.8V
D9
C109/DCD
O
Output for Data carrier detect signal (DCD) to
DTE
CMOS 2.8V
E11
C107/DSR
O
Output for Data set ready signal (DSR) to DTE
CMOS 2.8V
B6
C125/RING
O
Output for Ring indicator signal (RI) to DTE
CMOS 2.8V
DAC and ADC
C7
DAC_OUT
AO
Digital/Analog converter output
D/A
J11
ADC_IN1
AI
Analog/Digital converter input
A/D
H11
ADC_IN2
AI
Analog/Digital converter input
A/D
G11
ADC_IN3
AI
Analog/Digital converter input
A/D
Miscellaneous Functions
A2
RESET*
I
Reset input
4. GE864 Module Connections
4.1. PIN-OUT
GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
1
On this line a maximum of 10nF bypass capacitor is allowed
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Ball
Signal
I/O
Function
Internal PULL UP
Type
E2
VRTC
AO
VRTC Backup capacitor
Power
D8
STAT_LED
O
Status indicator led
CMOS 1.8V
G1
CHARGE
AI
Charger input
Power
G2
CHARGE
AI
Charger input
Power
J5
ON_OFF*
I
Input command for switching power ON or OFF
(toggle command).
47K
Pull up to VBATT
D5
VAUX1
-
Power output for external accessories
-
L8
PWRMON
O
Power ON Monitor
CMOS 2.8V
L4
Antenna
O
Antenna output 50 ohm
RF
D7
DVI2_CLK
-
DVI2_CLK (Digital Voice Interface)
4.7K
CMOS 2.8
C6
DVI1_TX
-
Digital Transmitting Data
4.7K
CMOS 2.8
GPIO
G4
TGPIO_12
I/O
Telit GPIO12 Configurable GPIO
CMOS 2.8V
C2
TGPIO_03
I/O
Telit GPIO03 Configurable GPIO
CMOS 2.8V
B3
TGPIO_04
I/O
Telit GPIO04 Configurable GPIO / RF
Transmission Control
CMOS 2.8V
C3
TGPIO_20
I/O
Telit GPIO20 Configurable GPIO
CMOS 2.8V
B4
TGPIO_14
I/O
Telit GPIO14 Configurable GPIO
CMOS 2.8V
D1
TGPIO_11
I/O
Telit GPIO11 Configurable GPIO
CMOS 2.8V
B1
TGPIO_19
I/O
Telit GPIO19 Configurable GPIO
CMOS 2.8V
C1
TGPIO_01
I/O
Telit GPIO01 Configurable GPIO
CMOS 2.8V
K7
TGPIO_18
I/O
Telit GPIO18 Configurable GPIO/ DVI2_RX
(Digital Voice Interface)
CMOS 2.8V
H5
TGPIO_17
I/O
Telit GPIO17 Configurable GPIO / DVI2_WA
(Digital Voice Interface)
CMOS 2.8V
F5
TGPIO_15
I/O
Telit GPIO15 Configurable GPIO
CMOS 2.8V
K11
TGPIO_08
I/O
Telit GPIO08 Configurable GPIO
CMOS 2.8V
B5
TGPIO_06 / ALARM
I/O
Telit GPIO06 Configurable GPIO / ALARM
CMOS 2.8V
C9
TGPIO_09
I/O
Telit GPIO09 GPIO I/O pin
CMOS 2.8V
E6
TGPIO_02 / JDR
I/O
Telit GPIO02 I/O pin / Jammer detect report
CMOS 2.8V
L9
TGPIO_07 / BUZZER
I/O
Telit GPIO07 Configurable GPIO / Buzzer
CMOS 2.8V
H6
TGPIO_16
I/O
Telit GPIO16 Configurable GPIO
CMOS 2.8V
K10
TGPIO_13
I/O
Telit GPIO13 Configurable GPIO
CMOS 2.8V
K8
TGPIO_05 / RFTXMON
I/O
Telit GPIO05 Configurable GPIO / Transmitter
ON monitor
CMOS 2.8V
L10
TGPIO_21
I/O
Telit GPIO21 Configurable GPIO
CMOS 2.8V
E8
TGPIO_22
I/O
Telit GPIO22 Configurable GPIO
CMOS 1.8V
(not 2.8V !!)
H3
TGPIO_10
I/O
Telit GPIO10 Configurable GPIO / DVI2_TX
(Digital Voice Interface)
CMOS 2.8V
Power Supply
J1
VBATT
-
Main power supply
Power
K1
VBATT
-
Main power supply
Power
J2
VBATT
-
Main power supply
Power
K2
VBATT
-
Main power supply
Power
A1
GND - Ground
Power
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Ball
Signal
I/O
Function
Internal PULL UP
Type
F1
GND - Ground
Power
H1
GND - Ground
Power
L1
GND - Ground
Power
H2
GND - Ground
Power
L2
GND - Ground
Power
J3
GND - Ground
Power
K3
GND - Ground
Power
L3
GND - Ground
Power
K4
GND - Ground
Power
K5
GND - Ground
Power
D6
GND - Ground
Power
K6
GND - Ground
Power
L6
GND - Ground
Power
A11
GND - Ground
Power
F11
GND - Ground
Power
L11
GND - Ground
Power
RESERVED
A10 - A3 - A4 - A5 - A6 - A7 -
A8 -
A9 - B10 - B11 - B2 - B8 - B9 - C4 - C8 - D2 - D3 - E1 -
E10 -
E3 - E4 - F2 - F3 - F4 - G6 - G7 - H4 -
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Ball
Signal
I/O
Function
Internal PULL UP
Type
H7 - J4 - J6 - J7 -
K9 -
L5 - E5 -
L7 -
G5 - G3 - F8 - C5 -
pin
signal
J1,K1,J2,K2
VBATT
A1,F1,H1,L1,H2,L2,J3,K3,L3,
K4,K5,D6,K6,L6,A11,F11,L11
GND
J5
ON/OFF*
E7
TXD
A2
RESET*
H8
RXD
GE864-QUAD Hardware User Guide
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NOTE:
The GE864-QUAD has one DVI port on the system interface.
the DVI2 port as this minimizes the impact on the module functionality.
NOTE:
RESERVED pins must not be connected
NOTE:
If not used, almost all pins must be left disconnected. The only exceptions are the
following pins2:
2
RTS should be connected to the GND (on the module side) if flow control is not used.
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Top view
A B C D E F G H J K
L
1
GND
TGPIO_19
TGPIO_01
TGPIO_11
-
GND
CHARGE
GND
VBATT
VBATT
GND 2 RESET*
-
TGPIO_03
-
VRTC - CHARGE
GND
VBATT
VBATT
GND 3 -
TGPIO_04
TGPIO_20
- - - - TGPIO_10
GND
GND
GND 4 --
TGPIO_14
-
SIMVCC
- - TGPIO_12
- - GND
Antenna
5
-
TGPIO_06 /
ALARM
VAUX1
-
TGPIO_15
-
TGPIO_17
ON_OFF*
GND
-
6
-
C125/RING
GND
TGPIO_02 /
JDR
C106 / CTS
-
TGPIO_16
-
GND
GND 7 -
C108 / DTR
DAC_OUT
DVI2_CLK
C103 / TXD
C105 / RTS
- - -
TGPIO_18
- 8 - - -
STAD_ LED
TGPIO_22
-
MIC_HF+
C104 / RXD
MIC_MT+
TGPIO_05 /
RFTXMON
PWRMON
9
- - TGPIO_09
C109 / DCD
SIMRST
AXE
MIC_MT-
EAR_MT-
MIC_HF-
-
TGPIO_07 /
BUZZER
10
- - SIMCLK
SIMIO
-
RX_TRACE
EAR_MT+
EAR_HF+
EAR_HF-
TGPIO_13
TGPIO_21
11
GND - SIMIN
TX_TRACE
C107 / DSR
GND
ADC_IN3
ADC_IN2
ADC_IN1
TGPIO_08
GND
4.1.1. BGA Balls Layout
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AUDIO Signals balls
SIM CARD interface balls
TRACE Signals balls
Prog. / data + Hw Flow Control signals balls
DAC and ADC signals balls
MISCELLANEOUS functions signals balls
TELIT GPIO balls
POWER SUPPLY VBATT balls
POWER SUPPLY GND balls
RESERVED
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5. Hardware Commands
5.1. Turning ON the GE864-QUAD
To turn on the GE864-QUAD the pad ON# must be tied low for at least 1 second and
then released.
The maximum current that can be drained from the ON# pad is 0,1 mA.
A simple circuit to do it is:
GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
NOTE:
Do not 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 GE864-QUAD power regulator and
improper power on/off of the module. The line ON# 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.
NOTE:
The GE864-QUAD turns fully on also by supplying power to the Charge pad (Module
provided with a battery on the VBATT pads).
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GE864-QUAD Hardware User Guide
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A flow chart showing the proper turn on procedure is displayed below:
TIP:
To check if the device has powered on, the hardware line PWRMON must be
monitored. After 900ms the line raised up the device could be considered powered
on.
PWRMON line rises up also when supplying power to the Charge pad
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GE864-QUAD Hardware User Guide
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For example:
Let us assume you need to drive the ON# pad with a totem pole output of a +3/5 V
micro controller (uP_OUT1):
Let us assume you need to drive the ON# pad directly with an ON/OFF button:
5.2. Turning OFF the GE864-QUAD
The turning off of the device can be done in two ways:
via AT command (see GE864-QUAD Software User Guide)
by tying low pin ON#
Either ways, when the device issues a detach request to the network informing that
the device will not be reachable any more.
To turn OFF the GE864-QUAD the pad ON# must be tied low for at least 2 seconds
and then released.
The same circuitry and timing for the power on shall be used.
The device shuts down after the release of the ON# pad.
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GE864-QUAD Hardware User Guide
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TIP:
To check if the device has powered off, the hardware line PWRMON must be
monitored. When PWRMON goes low, the device has powered off.
5.2.1. Hardware Unconditional Restart
WARNING:
The hardware unconditional Restart must not be used during normal operation of the
device since it does not detach the device from the network. It shall be kept as an
emergency exit procedure to be done in the rare case that the device gets stacked
waiting for some network or SIM responses.
To unconditionally restart the GE864-QUAD, the pad RESET# must be tied low for at
least 200 milliseconds and then released.
The maximum current that can be drained from the ON# pad is 0.15 mA.
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GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
A simple circuit to do it is:
NOTE:
Do not 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 GE864-QUAD power
regulator and improper functioning of the module. The line RESET# must be
connected only in open collector configuration.
TIP:
The unconditional hardware Restart must always be implemented on the boards and
must be used by the software as an emergency exit procedure.
- All Rights Reserved. Page 23 of 77
GE864-QUAD Hardware User Guide
1vv0300872 Rev.1 2010-04-02
The following flow chart shows the proper Reset procedure:
For example:
Let us assume you need to drive the RESET# pad with a totem pole output of a +3/5 V
microcontroller (uP_OUT2):
This signal is internally pulled up so the pin can be left floating if not used.
- All Rights Reserved. Page 24 of 77
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