Telit Wireless Solutions GC864 Hardware User's Manual
GC864 Hardware User Guide
1vv0300733 Rev.12 – 2010-06-04
GC864 Hardware User Guide
1vv0300733 Rev.12 – 2009-06-04
APPLICABILITY TABLE
PRODUCT
GC864-QUAD
GC864-PY
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GC864 Hardware User Guide
1vv0300733 Rev.12 – 2009-06-04
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 SpA 2009.©
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GC864 Hardware User Guide
1vv0300733 Rev.12 – 2009-06-04
Contents
APPLICABILITY TABLE.........................................................................................................................................2
1. INTRODUCTION................................................................................................................................6
1.1. SCOPE ........................................................................................................................................................6
1.2. AUDIENCE...................................................................................................................................................6
1.3. CONTACT INFORMATION, SUPPORT.................................................................................................................6
1.4. DOCUMENT ORGANIZATION ...........................................................................................................................7
1.5. TEXT CONVENTIONS .....................................................................................................................................8
1.6. RELATED DOCUMENTS..................................................................................................................................8
1.7. DOCUMENT HISTORY ....................................................................................................................................9
2. OVERVIEW...................................................................................................................................... 11
3. GC864 MECHANICAL DIMENSIONS................................................................................................ 12
3.1. MECHANICAL VIEW OF TELIT GC864-QUAD WITH SIM HOLDER......................................................................13
4. GC864-QUAD/PY MODULE CONNECTIONS ..................................................................................... 14
4.1. PIN-OUT.................................................................................................................................................14
4.1.1. GC864-QUAD/PY Antenna Connector............................................................................................17
5. HARDWARE COMMANDS................................................................................................................ 18
5.1. TURNING ON THE GC864-QUAD / PY.........................................................................................................18
5.2. TURNING OFF THE GC864-QUAD / PY .......................................................................................................20
5.2.1. Hardware Shutdown...................................................................... Error! Bookmark not defined.
5.2.2. Hardware Unconditional Reboot...................................................................................................21
6. POWER SUPPLY............................................................................................................................. 23
6.1. POWER SUPPLY REQUIREMENTS ..................................................................................................................23
6.2. GENERAL DESIGN RULES ............................................................................................................................24
6.2.1. Electrical Design Guidelines .........................................................................................................24
6.2.2. Thermal Design Guidelines...........................................................................................................30
6.2.3. Power Supply PCB Layout Guidelines...........................................................................................31
6.2.4. Parameters for ATEX Applications................................................................................................32
7. ANTENNA ...................................................................................................................................... 34
7.1. GSM ANTENNA REQUIREMENTS ..................................................................................................................34
7.2. GSM ANTENNA – INSTALLATION GUIDELINES................................................................................................35
8. LOGIC LEVEL SPECIFICATIONS...................................................................................................... 36
8.1. RESET SIGNAL...........................................................................................................................................37
9. SERIAL PORTS ...............................................................................................................................38
9.1. MODEM SERIAL PORT ...........................................................................................................................38
9.2. RS232 LEVEL TRANSLATION .......................................................................................................................41
9.3. 5V UART LEVEL TRANSLATION ...................................................................................................................43
10. AUDIO SECTION OVERVIEW ........................................................................................................ 45
1.1 SELECTION MODE .............................................................................................................................................45
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GC864 Hardware User Guide
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1.2 ELECTRICAL CHARACTERISTICS ..........................................................................................................................47
1.2.1 Input Lines Characteristics...................................................................................................................47
1.2.2 Output Lines Characteristics ................................................................................................................48
11. GENERAL PURPOSE I/O ............................................................................................................. 50
11.1. GPIO LOGIC LEVELS ..............................................................................................................................52
11.2. USING A GPIO PAD AS INPUT ................................................................................................................52
11.3. USING A GPIO PAD AS OUTPUT .............................................................................................................53
11.4. USING THE RF TRANSMISSION CONTROL GPIO4 .......................................................................................53
11.5. USING THE RFTXMON OUTPUT GPIO5 ...................................................................................................53
11.6. USING THE ALARM OUTPUT GPIO6 ..........................................................................................................54
11.7. USING THE BUZZER OUTPUT GPIO7.........................................................................................................54
11.8. MAGNETIC BUZZER CONCEPTS ................................................................................................................55
11.8.1. Short Description...........................................................................................................................55
1.2.1 Frequency Behavior ..............................................................................................................................56
11.8.2. Power Supply Influence.................................................................................................................56
11.8.3. Warning..........................................................................................................................................56
11.8.4. Working Current Influence............................................................................................................57
11.9. USING THE TEMPERATURE MONITOR FUNCTION.........................................................................................57
11.9.1. Short Description...........................................................................................................................57
11.9.2. Allowed GPIO .................................................................................................................................57
11.10. INDICATION OF NETWORK SERVICE AVAILABILITY........................................................................................58
11.11. RTC BYPASS OUT ..................................................................................................................................59
11.12. VAUX1 POWER OUTPUT .........................................................................................................................60
12. DAC AND ADC SECTION ............................................................................................................. 61
12.1. DAC CONVERTER ..................................................................................................................................61
12.1.1. Description.....................................................................................................................................61
12.1.2. Enabling DAC.................................................................................................................................61
12.1.3. Low Pass Filter Example...............................................................................................................62
12.2. ADC CONVERTER ..................................................................................................................................62
12.2.1. Description.....................................................................................................................................62
12.2.2. Using ADC Converter.....................................................................................................................62
13. MOUNTING THE GC864-QUAD/PY ON THE BOARD ..................................................................... 63
13.1.1. Debug of the GC864-QUAD/PY in Production ...............................................................................64
14. PACKING SYSTEM ...................................................................................................................... 65
15. CONFORMITY ASSESSMENT ISSUES .......................................................................................... 66
16. SAFETY RECOMMENDATIONS ....................................................................................................68
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GC864 Hardware User Guide
1vv0300733 Rev.12 – 2009-06-04
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 GC864-QUAD / PY module.
1.2. Audience
This document is intended for Telit customers, who are integrators, about to
implement their applications using our GC864 module.
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:
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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GC864 Hardware User Guide
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1.4. Document Organization
This document contains the following chapters:
Chapter 1: “Introduction”
provides a scope for this document, target audience,
contact and support information, and text conventions.
Chapter 2: “Overview”
provides an overview of the document.
Chapter 3: “GC864 Mechanical Dimensions”
Chapter 4: “GC864 Module Connections”
deals with the pin out configuration and
layout.
Chapter 5: “Hardware Commands”
How to control the module via hardware.
Chapter 6: “Power supply”
Power supply requirements and general design rules.
Chapter 7: “Antenna”
The antenna connection and board layout design are the most
important parts in the full product design
Chapter 8: “Logic Level specifications”
Specific values adopted in the implementation
of logic levels for this module.
Chapter 9: “Serial ports”
The serial port on the Telit GC864 is the core of the
interface between the module and OEM hardware
Chapter 10: “Audio Section overview”
Refers to the audio blocks of the Base Band
Chip of the GC864 Telit Modules.
Chapter 11: “General Purpose I/O”
How the general purpose I/O pads can be
configured.
Chapter 12 “DAC and ADC Section”
Deals with these two kind of converters.
Chapter 13: “Mounting the GC864 on the application board”
Recommendations and
specifics on how to mount the module on the user’s board.
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GC864 Hardware User Guide
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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.
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
• GC864 Product description, 80273ST10008a
• SIM Holder Design Guides, 80000NT10001a
• AT Commands Reference Guide, 80000ST10025a
• Telit EVK2 User Guide, 1vv0300704
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GC864 Hardware User Guide
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1.7. Document History
RReevviissiioonn DDaattee
CChhaannggeess
ISSUE#0 2006-06-12 Release First ISSUE# 0
ISSUE #1 2006-09-07 Full Review of the manual
Added ADC description
Added DAC description
Added Pinout and Process flow description
Added Packaging
ISSUE #2 2006-10-03 TGPIO23 now RESERVED
ISSUE #3 2006-11-07 3.1 (table on page 12); PWRCTL must be PWRMON
ISSUE #4 2007-02-08 Pinout updated, Camera removed, Added Stat Led and GPIO5 description, added
VAUX, schematics updated for On_off, reset, level adapter 5V, RS232
transceiver, Power supply. Modified Charger description.
ISSUE#5 2007-06-07
Updated DISCLAIMER, Added note on charger (CFUN4 and ON_OFF), Added
Power consumptions table, Added new table for GPIO status in Reset and Power
on, added RFTXMON timing, modified DB9 picture in par 8.2, Switching
description modified in “+ 12V input Source Power Supply Design Guidelines”,
Added Alternate Function for GPIO4.
ISSUE#6 2007-06-21
Updated Absolute maximum ratings, Added Alternate Function for GPIO2;
added PWRMON description during ON_OFF, updated chapter
ISSUE#7 2008-05-21
Added GC864-QUAD with SIM holder product p/n
Par 3.1: Removed nominal values on Audio, Added DVI pins descriptions
Par 5.1: Added Supply Voltage Range
Par 10.7: GPIO7 description; added section on Buzzer description
Par 9: Audio section removed (a dedicated User guide on audio has been
created)
Par 5.2.1.4: added note on Charger
Par 8.1: tip on RXD pull up added
11.3 added note on reflow not possible
8.3 pull ups referred to VAUX
10.9 Temperature monitor function added
4.2.2 removed table with logic levels
7 removed reference to buffered pins
ISSUE#8 2008-06-30
Added GC864-QUAD with SIM holder drawings (2.1)
4.1 and 4.22 modified example
7 Updated 1.8V CMOS voltage range
ISSUE#9 2009-01-22
Updated operating voltage and P/N list
Updated GC864-PY with SIM Holder module in the list of modules concerned by
this document
Added useful parameters for ATEX Applications
Updated Audio Block Diagram
ISSUE#10 2009-08-31
Applied new layout + minor editing
Modified idle consumption values
Added on/off/reset block diagrams procedures
Added DVI info in the pin-out section + notice
Added DVI App Note in the related documents list
GC864 Hardware User Guide
1vv0300733 Rev.12 – 2009-06-04
Noted in the pin-out section about rts in need of being connected to ground p.18
Updated all schematic drawings
Updated Chapter 10 Audio Section
ISSUE#11 2009-12-16
Modified power consumption values
Fixed minor adobe acrobat issues
ISSUE#12 2010-06-04
Updated Chapter 7.1 Gain values
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GC864 Hardware User Guide
1vv0300733 Rev.12 – 2009-06-04
2. Overview
In this document all the basic functions of a mobile phone are taken into account; for
each one of them a proper hardware solution is suggested and eventually the wrong
solutions and common errors to be avoided are 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-QUAD / PY module. For further
hardware details that may not be explained in this document refer to the Telit GC864QUAD / PY Product Description document where all the hardware information is
reported.
NOTICE:
(EN) The integration of the GSM/GPRS GC864-QUAD / PY 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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GC864 Hardware User Guide
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3. GC864 Mechanical Dimensions
The Telit GC864-QUAD/PY module overall dimensions are:
• Length: 36.2 mm
• Width: 30 mm
• Thickness: 3.2 mm
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GC864 Hardware User Guide
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3.1. Mechanical View of Telit GC864-QUAD with SIM Holder
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4. GC864-QUAD/PY Module Connections
4.1. PIN-OUT
The GC864-QUAD/PY uses a 80 pin Molex p.n. 53949-0878 male connector for the
connections with the external applications. This connector matches the 54150-0878
models.
Pin Signal I/O Function
Internal
Pull up
Type
Power Supply
1 VBATT - Main power supply Power
2 VBATT - Main power supply Power
3 VBATT - Main power supply Power
4 VBATT - Main power supply Power
5 GND - Ground Power
6 GND - Ground Power
7 GND - Ground Power
Audio
8 AXE I Handsfree switching 100KΩ CMOS 2.8V
9 EAR_HF+ AO Handsfree ear output, phase + Audio
10 EAR_HF- AO Handsfree ear output, phase - Audio
11 EAR_MT+ AO Handset earphone signal output, phase + Audio
12 EAR_MT- AO Handset earphone signal output, phase - Audio
13 MIC_HF+ AI Handsfree microphone input; phase Audio
14 MIC_HF- AI Handsfree microphone input; phase Audio
15 MIC_MT+ AI Handset microphone signal input; phase+ Audio
16 MIC_MT- AI Handset microphone signal input; phase- Audio
SIM Card Interface
181 SIMVCC - External SIM signal – Power supply for the SIM 1.8 / 3V
19 SIMRST O External SIM signal – Reset 1.8 / 3V
20 SIMIO I/O External SIM signal - Data I/O 1.8 / 3V
21 SIMIN I External SIM signal - Presence (active low) 47KΩ 1.8 / 3V
22 SIMCLK O External SIM signal – Clock 1.8 / 3V
Trace
23 RX_TRACE I RX Data for debug monitor/ DVI1_WA (Digital Voice Interface) CMOS 2.8V
24 TX_TRACE O TX Data for debug monitor/ DVI1_CLK (Digital Voice Interface) CMOS 2.8V
Prog. / Data + Hw Flow Control
1
On this line a maximum of 10nF bypass capacitor is allowed
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Pin Signal I/O Function
Internal
Pull up
Type
25 C103/TXD I Serial data input (TXD) from DTE CMOS 2.8V
26 C104/RXD O Serial data output to DTE CMOS 2.8V
27 C107/DSR O
Output for Data set ready signal (DSR) to DTE/ DVI1_RX (Digital Voice
Interface)
CMOS 2.8V
28 C106/CTS O Output for Clear to send signal (CTS) to DTE CMOS 2.8V
29 C108/DTR I Input for Data terminal ready signal (DTR) from DTE CMOS 2.8V
30 C125/RING O Output for Ring indicator signal (RI) to DTE CMOS 2.8V
31 C105/RTS I Input for Request to send signal (RTS) from DTE CMOS 2.8V
32 C109/DCD O Output for Data carrier detect signal (DCD) to DTE CMOS 2.8V
DAC and ADC
37 ADC_IN1 AI Analog/Digital converter input A/D
38 ADC_IN2 AI Analog/Digital converter input A/D
39 ADC_IN3 AI Analog/Digital converter input A/D
40 DAC_OUT AO Digital/Analog converter output D/A
Miscellaneous Functions
45 STAT_LED O Status indicator led CMOS 1.8V
46 GND - Ground Ground
49 PWRMON O Power ON Monitor CMOS 2.8V
50 VAUX1 - Power output for external accessories -
51 CHARGE AI Charger input Power
52 CHARGE AI Charger input Power
53 ON/OFF* I
Input command for switching power ON or OFF (toggle command). The
pulse to be sent to the GC864-QUAD/PY must be equal or greater than
1 second.
47KΩ Pull up to VBATT
54 RESET* I Reset input
55 VRTC AO VRTC Backup capacitor Power
36 DVI2_CLK - Digital Voice Interface Clock 4.7KΩ CMOS 2.8V
Telit GPIO
56 TGPIO_19 I/O Telit GPIO19 Configurable GPIO CMOS 2.8V
57 TGPIO_11 I/O Telit GPIO11 Configurable GPIO CMOS 2.8V
58 TGPIO_20 I/O Telit GPIO20 Configurable GPIO CMOS 2.8V
59 TGPIO_04 I/O Telit GPIO4 Configurable GPIO / RF Transmission Control CMOS 2.8V
60 TGPIO_14 I/O Telit GPIO14 Configurable GPIO CMOS 2.8V
61 TGPIO_15 I/O Telit GPIO15 Configurable GPIO CMOS 2.8V
62 TGPIO_12 I/O Telit GPIO12 Configurable GPIO CMOS 2.8V
63 TGPIO_10 I/O Telit GPIO10 Configurable GPIO / DVI2_TX (Digital Voice Interface) CMOS 2.8V
64 TGPIO_22 I/O Telit GPIO22 Configurable GPIO CMOS 1.8V
65 TGPIO_18 I/O Telit GPIO18 Configurable GPIO / DVI2_RX (Digital Voice Interface) CMOS 2.8V
66 TGPIO_03 I/O Telit GPIO3 Configurable GPIO CMOS 2.8V
67 TGPIO_08 I/O Telit GPIO8 Configurable GPIO CMOS 2.8V
GC864 Hardware User Guide
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Pin Signal I/O Function
Internal
Pull up
Type
68 TGPIO_06 / ALARM I/O Telit GPIO6 Configurable GPIO / ALARM CMOS 2.8V
70 TGPIO_01 I/O Telit GPIO1 Configurable GPIO CMOS 2.8V
71 TGPIO_17 I/O Telit GPIO17 Configurable GPIO / DVI2_WA (Digital Voice Interface) CMOS 2.8V
72 TGPIO_21 I/O Telit GPIO21 Configurable GPIO CMOS 2.8V
73 TGPIO_07 / BUZZER I/O Telit GPIO7 Configurable GPIO / Buzzer CMOS 2.8V
74 TGPIO_02 / JDR I/O Telit GPIO02 I/O pin / Jammer detect report CMOS 2.8V
75 TGPIO_16 I/O Telit GPIO16 Configurable GPIO CMOS 2.8V
76 TGPIO_09 I/O Telit GPIO9 Configurable GPIO CMOS 2.8V
77 TGPIO_13 I/O Telit GPIO13 Configurable GPIO CMOS 2.8V
78 TGPIO_05/ RFTXMON I/O Telit GPIO05 Configurable GPIO / Transmitter ON monitor CMOS 2.8V
RESERVED
17 -
33 -
34 -
41 -
42 -
43 -
44 -
47 -
48 -
79 -
69 -
80 -
35 DVI1_TX - Digital Voice Interface Transmitted Data 4.7KΩ CMOS 2.8V
NOTE:
The GC864 family Wireless Modules (GC864-QUAD and GC864-PY) has two DVI ports
on the system interface.
Only one port can be selected and be active at the time. The choice of DVI port
depends on the needs of the application, but Telit suggests that applications only use
the DVI2 port as this minimizes the impact on the module functionality.
GC864 Hardware User Guide
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NOTE:
Reserved pins must not be connected.
NOTE:
RTS must be connected to the GND (on the module side) if flow control is not used.
NOTE:
If not used, almost all pins must be left disconnected. The only exceptions are the
following pins
2
:
Pin Signal Function
1 VBATT Main power supply
2 VBATT Main power supply
3 VBATT Main power supply
4 VBATT Main power supply
5 GND Ground
6 GND Ground
7 GND Ground
46 GND Ground
25 C103/TXD Serial data input (TXD) from DTE
26 C104/RXD Serial data output to DTE
31 C105/RTS Input for Request to send signal (RTS) from DTE
53 ON/OFF* Input command for switching power ON or OFF (toggle command).
54 RESET* Reset input
4.1.1. GC864-QUAD/PY Antenna Connector
The GC864-QUAD/PY module is equipped with a 50 RF connector from Murata,
GSC type P/N MM9329-2700B.
The counterpart suitable is Murata MXTK92 Type or MXTK88 Type.
Moreover, the GC864-QUAD/PY 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
RTS should be connected to the GND (on the module side) if flow control is not used.
GC864 Hardware User Guide
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5. Hardware Commands
5.1. Turning ON the GC864-QUAD / PY
To turn the GC864-QUAD / PY on, the pad ON# must be tied low for at least 1 second
and then released. A pulse duration less than 1 second should also start the power
on procedure, but this is not guaranteed.
The maximum current that can be drained from the ON# pad is 0,1 mA.
A simple circuit to do it is:
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.
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 GC864-QUAD / PY power regulator
and improper power on/off of the module. The line ON# must be connected only in
open collector configuration.
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.
The GC864-QUAD / PY turns fully on also by supplying power to the Charge pad
(Module provided with a battery on the VBATT pads).
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GC864 Hardware User Guide
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For example:
1- Let us assume you need to drive the ON# pad with a totem pole output of a +3/5 V
microcontroller (uP_OUT1):
2- Let us assume you need to drive the ON# pad directly with an ON/OFF button:
A flow chart with proper turn on procedure is detailed below:
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GC864 Hardware User Guide
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5.2. Turning OFF the GC864-QUAD / PY
Turning off of the device can be done in three ways:
• by software command (see GC864-QUAD / PY Software User Guide)
• by tying low pin ON#
Either ways, the device issues a detach request to network informing that the device
will not be reachable any more.
To turn OFF the GC864 via pin ON#, this must be tied low for at least 1s 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# pin.
The following flow chart shows the proper turnoff procedure:
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GC864 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, then 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 GC864-QUAD / PY, 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.
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 cause latch up problems on the GC864-QUAD / PY power
regulator and improper functioning of the module. The line RESET* must be
connected only in open collector configuration.
TIP:
The unconditional hardware reboot must always be implemented on the boards and
the software must use it as an emergency exit procedure.
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