Neo_gm650 Hardware User Guide V2.1

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Neo_GM650 Hardware User Guide V2.1 Neo_GM650 Hardware User Guide Copyright © Neoway Technology Co., Ltd 2014. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Shenzhen Neoway Technology Co., Ltd. is the trademark of Neoway Technology Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice This document is intended for system engineers (SEs), development engineers, and test engineers. The information in this document is subject to change without notice due to product version update or other reasons. Every effort has been made in preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied. Neoway provides customers complete technical support. If you have any question, please contact your account manager or email to the following email addresses: [email protected] [email protected] Website: http://www.neoway.com.cn Copyright © Neoway Technology Co., Ltd i Neo_GM650 Hardware User Guide Revision Record Issue Changes Date V1.0 Initial draft. 2012-03 V1.1 Changed the startup marks. 2012-04 V1.2  Added the UART2 pin and description. 2012-05  Deleted the PWM pin.  Added GPS data output mode description.  Changed the description about audio output in section 5.1.  Added section 6.5.  Added section 6.6.  Added section 6.9.  Changed the waiting current.  Added section for GPS antenna reference design.  Added section 2.2.  Modified the waiting current.  In section 6.1, added LDO power supply reference and separate design reference, added the description of the UART output during the module startup.  In section 6.4, added suggestion about adding ESD protection to SIM card interface.  In section 6.6, added design description of AC coupling at audio output port.  In section 6.8, added design description of AC coupling of active GPS antenna. V1.6  Changed section 5.2 PCB Foot Print. 2012-10 V1.7  Added the mark for test point in section 5.2. 2012-11  Changed section 6.1.3 Power-on Procedure.  Changed the pulse width of the RING sign in 6.3.2. V1.3 V1.4 V1.5 2012-06 2012-08 2012-09 V1.8 Added two models: GM650D-R1-02-STD, GM650Q-R1-02-STD 2012-11 V1.9  In section 5.1 and 6.1.5, added recommendations of pull-up on the RESET pin. 2012-12  Added section 6.9 GPS Function Switch. Copyright © Neoway Technology Co., Ltd ii Neo_GM650 Hardware User Guide V2.0 V2.1  Modified the pin definition in section 5.1.  Added the description of BATSNS in section 6.1.  Modified the UAR description in section 6.2.  Deleted the column of module model.  Changed the pin definition of the module.  Modified the description of BATSNS pin handling.  Deleted the charging interface design.  Changed the module encapsulation. Copyright © Neoway Technology Co., Ltd 2013-09 2014-02 iii Neo_GM650 Hardware User Guide Contents 1 Overview ..................................................................................................................... 1 2 Appearance ................................................................................................................. 1 3 Simplified Block Diagram ....................................................................................... 1 4 Feature ......................................................................................................................... 2 4.1 General Parameters .................................................................................................................... 2 4.2 GPRS Specifications .................................................................................................................. 2 4.3 GPS Specifications..................................................................................................................... 3 5 Pin Definition & Encapsulation ............................................................................. 4 5.1 Pin Definition ............................................................................................................................. 4 5.2 PCB Foot Print ........................................................................................................................... 8 6 Interface Design ......................................................................................................... 9 6.1 Power Supply and On/Off Interface ........................................................................................... 9 6.1.1 Design Requirement ......................................................................................................... 9 6.1.2 Power-on Procedure........................................................................................................ 14 6.1.3 ON/OFF Procedure ......................................................................................................... 14 6.1.4 VCCIO ............................................................................................................................ 16 6.1.5 RESET ............................................................................................................................ 16 6.2 UART ....................................................................................................................................... 16 6.3 DTR and RING ........................................................................................................................ 18 6.3.1 DTR ................................................................................................................................ 19 6.3.2 RING Signal Indicator .................................................................................................... 19 6.4 SIM Card Interface .................................................................................................................. 20 6.5 Running LED Indicator............................................................................................................ 21 6.6 Audio Interface......................................................................................................................... 22 6.7 RF Interface and PCB Layout .................................................................................................. 24 6.7.1 GPRS Interface ............................................................................................................... 24 6.7.2 GPS Interface .................................................................................................................. 26 6.7.3 Active GPS Antenna Design ........................................................................................... 27 6.7.4 Passive GPS Antenna Design ......................................................................................... 28 6.8 GPS Data Interface Mode ........................................................................................................ 28 6.9 GPS Function Switch ............................................................................................................... 29 7 Mounting the Module onto the Application Board .......................................... 29 8 Package ...................................................................................................................... 29 9 Abbreviations ........................................................................................................... 30 Copyright © Neoway Technology Co., Ltd iv Neo_GM650 Hardware User Guide Table of Figures Figure 3-1 GM650 block diagram ................................................................................................... 1 Figure 5-1 GM650 pins ................................................................................................................... 4 Figure 5-2 Recommended foot print for GM650 (top view) ........................................................... 8 Figure 6-1 Capacitors used for the power supply.......................................................................... 10 Figure 6-2 Current peaks and voltage drops ................................................................................. 10 Figure 6-3 Example of MIC29302 controlling the power supply ................................................. 11 Figure 6-4 Example of power supply controlled by p-MOSFET .................................................. 11 Figure 6-5 Using separated power supply for module .................................................................. 12 Figure 6-6 VRTC circuit reference 1 ............................................................................................. 13 Figure 6-7 VRTC circuit reference 2 ............................................................................................. 13 Figure 6-8 BATSNS reference ...................................................................................................... 14 Figure 6-9 Turning on/off the module using ON/OFF .................................................................. 14 Figure 6-10 Reference circuit for ON/OFF control ....................................................................... 15 Figure 6-11 Signal connecting between DCE and DTE ................................................................ 17 Figure 6-12 Recommended circuit for the communication between 3.3 V MCU and UART ....... 17 Figure 6-13 Recommended circuit for the communication between 5 V MCU and UART.......... 18 Figure 6-14 RING indicator for incoming call .............................................................................. 19 Figure 6-15 RING indicator for SMS ........................................................................................... 20 Figure 6-16 Reference design of SIM card interface .................................................................... 20 Figure 6-17 LED indicator ............................................................................................................ 21 Figure 6-18 Reference design of microphone interface ................................................................ 22 Figure 6-19 Reference design for MIC interface .......................................................................... 23 Figure 6-20 Reference design for receiver output ......................................................................... 23 Figure 6-21 Reference design for speaker output.......................................................................... 24 Figure 6-22 Coupling capacitor interfacing .................................................................................. 24 Figure 6-23 Reference design for antenna interface...................................................................... 25 Figure 6-24 RF layout reference ................................................................................................... 26 Figure 6-25 RF antenna matching 50Ω ........................................................................................ 26 Figure 6-26 Active antenna feeding reference .............................................................................. 27 Figure 6-27 Power supply reference for active antenna ................................................................ 27 Figure 6-28 Passive GPS antenna design reference ...................................................................... 28 Figure 6-29 Obtaining GPS data from UART through AT commands .......................................... 28 Figure 6-30 Reference connection between baseband and GPS chipset ....................................... 29 Copyright © Neoway Technology Co., Ltd v Neo_GM650 Hardware User Guide Table of Tables Table 2-1 GM650 appearance specifications .................................................................................. 1 Table 4-1 General parameters ......................................................................................................... 2 Table 4-2 GPRS specifications........................................................................................................ 2 Table 4-3 GPS specifications .......................................................................................................... 3 Table 5-1 GM650 pin definition ..................................................................................................... 4 Table 6-1 Power supply and On/Off interface................................................................................. 9 Table 6-2 UART ............................................................................................................................ 16 Table 6-3 DTR and RING pins ..................................................................................................... 18 Table 6-4 SIM card interface......................................................................................................... 20 Table 6-5 LED interface ................................................................................................................ 21 Table 6-6 Audio Interface ............................................................................................................. 22 Copyright © Neoway Technology Co., Ltd vi Neo_GM650 Hardware User Guide 1 Overview GM650 is a wireless industrial module that supports open platform and GSM/GPRS+GPS. It provides users with reserved CPU resource and plenty of hardware interfaces, widely used in various industrial and civil applications. The module has high-fidelity voice, messaging, data connectivity, GPS positioning and other functions. If your MCU has only one UART interface but your product requires GPRS communications and GPS positioning functions, GM650 is a perfect choice. This document defines the features, indicators, and test standards of the GM650 module and provides reference for the hardware design of each interface. 2 Appearance Table 2-1 GM650 appearance specifications Specifications Description Dimensions 30.0 mm x 24.0 mm x 2.7 mm Weight 3.7 g Package 74-Pin LCC 3 Simplified Block Diagram GM650 consists of baseband controller, Flash, audio section, RF section, application interfaces, power manager, and GPS section, etc. All sections coordinate with each other to provide such communication functions as GPRS data and voice. Figure 3-1 GM650 block diagram Copyright © Neoway Technology Co., Ltd 1 Neo_GM650 Hardware User Guide 4 Feature 4.1 General Parameters Table 4-1 General parameters General Parameter Description Operating temperature -40℃ to +85℃ Operating voltage 3.5 V to 4.3 V (3.9 V is recommended) 4.2 GPRS Specifications Table 4-2 GPRS specifications GPRS Specifications Description Frequency 900/1800/850/1900 MHz Sensitivity -107 dBm Maximum transmission 850/900 Class4(2W) power 1800/1900 Class1(1W) Protocol Compatible with GSM/GPRS Phase2/2+ GSM07.07 AT Extended command set Audio FR, EFR, HR, AMR voice coding TEXT/PDU SMS Point to point/cell broadcast Packet Data GPRS CLASS 12 Support CSD data service Circuit Switch Data Support USSD Call forwarding (CFB, CFNA, CFU) Call waiting Supplement service Three-party calling TTS Main Processor ARM7EJ-S 32-bit @260MHz Open software resource 32 to 64 MB RAM, 16 to 31 MB Flash Open hardware resource UART, I2C, LCD (SPI), MMC, USB, ADC, PWM, GPIO, Keypad Copyright © Neoway Technology Co., Ltd 2 Neo_GM650 Hardware User Guide Peak current Max 1.8 A Average operating current < 250 mA Standby current <2.0 mA (Close the GPS) 4.3 GPS Specifications Table 4-3 GPS specifications GPS Specifications Description GPS channel 66 acquisition-channel receiver / 22 tracking GPS sensitivity < -148 dBm (cold)/-163 dBm (hot) Positioning accuracy < 10 m Speed accuracy 0.01 m/s Time accuracy Synchronize with the GPS satellite time (<10 ns) Time of hot start <1 s Time of cold start <35 s Time of recapture <0.1 s GPS updating frequency 1 Hz Height limit 18288 m Speed limit 515 m/s or 1854 km/h Acceleration limit <4 g Average working current (tracking mode) 18 mW Average working current (getting position) 25 mW The starting time, operating current and other GPS parameters relate to the testing environment, including whether is under open sky, thickness of the clouds and so on. Copyright © Neoway Technology Co., Ltd 3 Neo_GM650 Hardware User Guide 5 Pin Definition & Encapsulation 5.1 Pin Definition The GM650 uses 74-pin SMD pads for signal connection. The pins are in stamp-hole type (half hole). Figure 5-1 GM650 pins The maximum input voltage at all IO ports cannot exceed 3.3 V because the module uses a 2.8 V IO power system. The input voltage should be lower than 3.0 V so that the module can work properly. During the application, the IO output voltage from the 3.3 V power supply system of the external circuit might greatly overshoot 3.3 V due to the signal integrity design. In this situation, the IO pins of the module might be damaged if the IO signals are connected to the IO ports of the 2.8 V system. To rectify this issue, take measures to match the level. For details, see 6.2 UART. Table 5-1 GM650 pin definition Pin Signal I/O Function 1 GND PWR Ground Level Remark 0