GC864 QUAD V2 and GC864 DUAL V2 Hardware User Guide 1vv0300874 Rev.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 APPLICABILITY TABLE PRODUCT GC864-QUAD V2 GC864-DUAL V2 GC864-QUAD V2 with SH Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 Contents APPLICABILITY TABLE........................................................................................................................................2 1. INTRODUCTION................................................................................................................................ 6 1.1. 1.2. 1.3. 1.4. 1.5. 1.6. 1.7. SCOPE ....................................................................................................
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 Input Lines Characteristics ...........................................................................................................43 Output Lines Characteristics.........................................................................................................44 10.2.1. 10.2.2. 11. GENERAL PURPOSE I/O ............................................................................................................. 46 11.1. 11.2. 11.3. 11.4.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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 V2 / GC864-DUAL V2 module. 1.2. Audience This document is intended for Telit customers, who are integrators, about to implement their applications using our GC864-QUAD V2 / GC864-DUAL V2 module. 1.3.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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-QUAD V2 / GC864-DUAL V2 Mechanical Dimensions” Chapter 4: “GC864-QUAD V2 / GC864-DUAL V2 Module Connections” deals with the pin out configuration and layout.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 1.7. Document History Revision Date Changes ISSUE#0 2010-01-25 Release First ISSUE# 0 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 3. GC864 Mechanical Dimensions The Telit GC864-QUAD V2 / GC864-DUAL V2 module overall dimensions are: • • • • Length: Width: Thickness: Weight: 36.2 mm 30 mm 3.2 mm 4.8g Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 3.1. Mechanical View of Telit GC864-QUAD V2 with SIM Holder Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 4. GC864-QUAD V2 / GC864-DUAL V2 Module Connections 4.1. PIN-OUT The GC864-QUAD V2 / GC864-DUAL V2 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.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 Pin 47 Signal SERVICE I/O Function I Internal Type Pull up Service pin shall be used to upgrade the module from ASC1 (RX_TRACE, TX_TRACE). The pin shall be tied low to enable the feature only in case of a SW Update activity. It is required, for debug purpose, to be connected to a test pad on the final application. CMOS 2.8V Prog. / Data + Hw Flow Control 25 C103/TXD I Serial data input (TXD) from DTE CMOS 2.
GC864 Hardware User Guide 1vv0300874 Rev.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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: 4.1.1.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 5. Hardware Commands 5.1. Turning ON the GC864-QUAD V2 / GC864-DUAL V2 To turn the GC864-QUAD V2 / GC864-DUAL V2 on, the pad ON# must be tied low for at least 1000ms and then released. A pulse duration less than 1000ms 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.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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: Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 5.2. Turning OFF the GC864-QUAD V2 / GC864-DUAL V2 Turning off of the device can be done in three ways: • by software command (see GC864-QUAD V2 / GC864-DUAL V2 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 1000ms and then released.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 In the following flow chart is detailed the proper restart procedure: For example: 1- Let us assume you need to drive the RESET# pad with a totem pole output of a +3/5 V microcontroller (uP_OUT2): Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 6. 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 following requirements and guidelines for a proper design. 6.1. Power Supply Requirements Condition Nominal Supply Voltage Normal operating Voltage Range Extended operating Voltage Range Value 3.80 V 3.40 V - 4.20 V 3.22 V – 4.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 The GSM system is made in a way that the RF transmission is not continuous but it is packed into bursts at a base frequency of about 216 Hz. The relative current peaks can be as high as about 2A. Therefore the power supply has to be designed in order to withstand with these current peaks without big voltage drops; this means that both the electrical design and the board layout must be designed for this current flow.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 • A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks close to the GC864-QUAD V2 / GC864-DUAL V2, a 100μF tantalum capacitor is usually suited. • Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at least 10V.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 6.2.1.2. +12V input Source Power Supply Design Guidelines • The desired output for the power supply is 3.8V, hence, due to the big difference between the input source and the desired output, a linear regulator is not suited and shall not be used. A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by the GC864-QUAD V2 / GC864-DUAL V2.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 An example of switching regulator with 12V input is in the schematic below (split in 2 parts): Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 6.2.1.3. Battery Source Power Supply Design Guidelines The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is 4.5V. A single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit GC864-QUAD V2 / GC864-DUAL V2 module. CAUTION: The three cells Ni/Cd or Ni/MH 3,6 V Nom.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 NOTE: The average consumption during transmissions depends on the power level at which the device is requested to transmit by the network. The average current consumption hence varies significantly. Considering the very low current during idle, especially if Power Saving function is enabled, it is possible to consider from the thermal point of view that the device absorbs current significantly only during calls.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 6.2.4. • The PCB traces from the input connector to the power regulator IC must be wide enough to ensure no voltage drops occur when the 2A current peaks are absorbed. Note that this is not made in order to save power loss but especially to avoid the voltage drops on the power line at the current peaks frequency of 216 Hz that will reflect on all the components connected to that supply, introducing the noise floor at the burst base frequency.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 • In abnormal conditions, the maximum RF output power may be up to 34 dBm. For this particular application, we recommend the customer to involve TTSC (Telit Technical Support Center) in the design phase of the application. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 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. 7.1.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 7.2. GSM Antenna – Installation Guidelines • Install the antenna in a place covered by the GSM signal. • The Antenna must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter; • Antenna shall not be installed inside metal cases • Antenna shall be installed also according Antenna manufacturer instructions.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 8. 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 Telit GC864-QUAD V2 / GC864-DUAL V2 interface circuits: Absolute Maximum Ratings – Not Functional Parameter Min Max Input level on any -0.3V digital pin when on Input voltage on -0.3V analog pins when on +3.1V +3.0 V Operating Range – Interface Levels (2.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 8.1. Reset Signal Signal RESET Function Reset I/O I PIN Number 54 RESET is used to reset the GC864-QUAD V2 / GC864-DUAL V2 modules. Whenever this signal is pulled low, the GC864-QUAD V2 / GC864-DUAL V2 is reset. When the device is reset it stops any operation. After the release of the reset GC864-QUAD V2 / GC864-DUAL V2 is unconditionally shut down, without doing any detach operation from the network where it is registered.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 9. Serial Ports The serial port on the Telit GC864-QUAD V2 / GC864-DUAL V2 is the core of the interface between the module and OEM hardware. 2 serial ports are available on the module: • • 9.1. MODEM SERIAL PORT MODEM SERIAL PORT 2 (TRACE for debug) MODEM SERIAL PORT 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.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 Operating Range – Interface levels (2.8V CMOS) Level Input high level VIH Input low level VIL Output high level VOH Output low level VOL Min 2.1V 0V 2.2V 0V Max 3.1V 0.5V 3.0V 0.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 TIP: For a minimum implementation, only the TXD and RXD lines can be connected, the other lines can be left open provided a software flow control is implemented. 9.2. RS232 Level Translation In order to interface the Telit GC864-QUAD V2 / GC864-DUAL V2 with a PC com port or a RS232 (EIA/TIA-232) application a level translator is required.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 NOTE: In order to be able to do in circuit reprogramming of the GC864-QUAD V2 / GC864DUAL V2 firmware, the serial port on the Telit GC864-QUAD V2 / GC864-DUAL V2 shall be available for translation into RS232 and either it is controlling device shall be placed into tristate, disconnected or as a gateway for the serial data when module reprogramming occurs.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 The RS232 serial port lines are usually connected to a DB9 connector with the following layout: 9.3. 5V UART Level Translation If the OEM application uses a microcontroller with a serial port (UART) that works at a voltage different from 2.8 – 3V, then a circuitry has to be provided to adapt the different levels of the two set of signals. As for the RS232 translation there are a multitude of single chip translators.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 TIP: Note that the TC7SZ07AE has open drain output; therefore the resistor R2 is mandatory. NOTE: The UART input line TXD (rx_uart) of the GC864-QUAD V2 / GC864-DUAL V2 is NOT internally pulled up with a resistor, so there may be the need to place an external 47KΩ pull-up resistor, either the DTR (dtr_uart) and RTS (rts_uart) input lines are not pulled up internally, so an external pull-up resistor of 47KΩ may be required.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 10. Audio Section Overview The first Baseband chip was developed for the cellular phones, which needed two separated amplifiers both in RX and in TX section. A couple of amplifiers had to be used with internal audio transducers while the other couple of amplifiers had to be used with external audio transducers.
GC864 Hardware User Guide 1vv0300874 Rev.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 10.2. Electrical Characteristics TIP: Being the microphone circuitry the more noise sensitive, its design and layout must be done with particular care. Both microphone paths are balanced and the OEM circuitry must be balanced designed to reduce the common mode noise typically generated on the ground plane. However the customer can use the unbalanced circuitry for its particular application. 10.2.1.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 10.2.2. Output Lines Characteristics TIP: We suggest driving the load differentially from both output drivers, thus the output swing will double and the need for the output coupling capacitor avoided. However if particular OEM application needs also a Single Ended circuitry can be implemented, but the output power will be reduced four times .
GC864 Hardware User Guide 1vv0300874 Rev.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 11.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 Not all GPIO pads support all these three modes: 11.1.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 11.2. Using a GPIO Pad as INPUT The GPIO pads, when used as inputs, can be connected to a digital output of another device and report its status, provided this device has interface levels compatible with the 2.8V CMOS levels of the GPIO. If the digital output of the device to be connected with the GPIO input pad has VDD Q1 GPIO7 Q2 interface levels different from the 2.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 For example, if a call is started, the line will be HIGH during all the conversation and it will be again LOW after hanged up. The line rises up 300ms before first TX burst and will became again LOW from 500ms to 1sec after last TX burst. 11.6.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 TR2 SMBT2907A +V buzzer R1 4,7K D1 D1N4148 C1 33pF + - R2 1K GPIO7 TR1 BCR141W Example of Buzzer’s driving circuit NOTE: To correctly drive a buzzer, a driver must be provided; its characteristics depend on the Buzzer and for them refer to your buzzer vendor. 11.8. Magnetic Buzzer Concepts 11.8.1.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 The disk and diaphragm are attracted to the core by the magnetic field. When an oscillating signal is moved through the coil, it produces a fluctuating magnetic field, which vibrates the diaphragm at a frequency of the drive signal. Thus the sound is produced relative to the frequency applied. Diaphragm movement 11.8.1 Frequency Behavior The frequency behavior represents the effectiveness of the reproduction of the applied signals.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 11.8.4. Working Current Influence In the component data sheet you will find the value of MAX CURRENT that represents the maximum average current that can flow at nominal voltage without current limitation. In other words it is not the peak current, which could be twice or three times higher. If driving circuitry does not support these peak values, the SPL will never reach the declared level or the oscillations will stop. 11.9.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 11.10. Indication of Network Service Availability The STAT_LED pin status shows information on the network service availability and Call status. In the GC864-QUAD V2 / GC864-DUAL V2 modules, the STAT_LED usually needs an external transistor to drive an external LED. Therefore, the status indicated in the following table is reversed with respect to the pin status.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 11.11. RTC Bypass Out The VRTC pin 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. Reproduction forbidden without Telit Communications S.p.A.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 11.12. DAC Converter 11.12.1. Description Pin Signal Internal Pull up I/O Function Type DAC Converter 40 DAC_OUT AO Digital/Analog converter output D/A The GC864-QUAD V2 / GC864-DUAL V2 module provides one Digital to Analog 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.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 NOTE: The DAC frequency is selected internally. D/A converter must not be used during POWERSAVING. 11.12.3. Low Pass Filter Example 11.13. ADC Converter 11.13.1.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 11.13.2. Using ADC Converter The AT command below is available to use the ADC function: AT#ADC=1,2 The read value is expressed in mV. Refer to SW User Guide or AT Commands Reference Guide for the full description of this function. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 12. Assembly the GC864-QUAD V2 / GC864-DUAL V2 on the Board The position of the Molex board to board connector and the pin 1 are shown in the following picture. NOTE: The metal tabs present on GC864-QUAD V2 / GC864-DUAL V2 must be connected to GND. This module could not be processed with a reflow. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 12.1.1. Debug of the GC864-QUAD V2 / GC864-DUAL V2 in Production To test and debug the mounting of the GC864, we strongly recommend to foreseen test pads on the host PCB, in order to check the connection between the GC864QUAD V2 / GC864-DUAL V2 itself and the application and to test the performance of the module connecting it with an external computer.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 13. Packing System The Telit GC864-QUAD V2 / GC864-DUAL V2 are packaged on trays of 20 pieces each. The size of the tray is: 329 x 176mm. WARNING: These trays can withstand at the maximum temperature of 65° C. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 14. Conformity Assessment Issues The Telit GC864-QUAD V2 has been assessed in order to satisfy the essential requirements of the R&TTE Directive 1999/05/EC (Radio Equipment & Telecommunications Terminal Equipments) to demonstrate the conformity against the harmonized standards with the final involvement of a Notified Body. If the module is installed in conformance to the Telit installation manuals, no further evaluation under Article 3.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 • The system antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all the persons and must not be colocated or operating in conjunction with any other antenna or transmitter. • The system antenna(s) used for this module must not exceed 1.4dBi (850MHz) and 3.0dBi (1900MHz) for mobile and fixed or mobile operating configurations.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 15. SAFETY RECOMMENDATIONS NOTE: Read this section carefully to ensure the safe operation. Be sure the use of this product is allowed in the country and in the environment required.
GC864 Hardware User Guide 1vv0300874 Rev.0 – 2010-01-25 The European Community provides some Directives for the electronic equipments introduced on the market. All the relevant information are available on the European Community website: http://europa.eu.int/comm/enterprise/rtte/dir99-5.htm The text of the Directive 99/05 regarding telecommunication equipments is available, while the applicable Directives (Low Voltage and EMC) are available at: http://europa.eu.int/comm/enterprise/electr_equipment/index_en.
