UNSGSM V2.X. Quad-Band SocketModem. Designer s Guide

Transcription

1 UNSGSM V2.X Quad-Band SocketModem Designer s Guide

2 Summary This document defines and specifies the new Generation of the UNSGSM_V2.X SocketModem of UNITRONIC. There are four versions of the UNSGSM SocketModem available. For detailed information about the differences please read chapter Document information Revision Date State of evolution Name Function A Creation as Preliminary Vladimir Kühne HW Development Copyright information Copyright UNITRONIC AG All rights are reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under copyright laws. Trademarks SocketModem is a registered trademark of UNITRONIC AG. All other products mentioned herein may be trademarks of their respective companies. German Headquarters Unitronic AG Mündelheimer Weg 9 D Düsseldorf Phone: +49 (0) 211 / Fax: +49 (0) 211 / Internet address: contact: info@unitronic.de 0051-VK-401A 2

3 Table of contents 1. Product description Main functions overview GSM/GPRS Features GPS features (UNSGSM V2.4) Hardware Features Versions and Features Software Features External connections Power supply and digital-i/o s SIM-card Reader SIM-Chip (UNSGSM V2.2) Interface description Interface block diagram Socket pin out Pin Overview and Description Pin Out Overview Pin Description of UNSGSM V2.1 and V2.2 Modems Pin Description of UNSGSM V2.3 Modem Pin Description of UNSGSM V2.4 Modem Function description Power supply RTC supply Main Serial Link (UART1) Auxiliary Serial Link (UART2) SIM interface (UNSGSM V2.3) SPI / I2C bus Audio Interface GPIOs Internal GPIOs FLASH-LED Logic Level Control LLC Reset signal ~RST Boot signal Electrical Specifications Power supply electrical characteristics Power supply voltage Power Consumption modes VK-401A 3

4 Power consumption Digital Interface electrical characteristics CMOS I/O Type Push Pull I/O Type Audio interface electrical characteristics Microphone Input MIC Speaker Output SPKR SIM interface electrical characteristics RF interface GSM/GPRS RF performances GPS RF Performance Design guidelines Physical specifications Temperature range Physical Weight Technical drawing Power supply Grounding RF Connection Antenna specifications GSM/GPRS Antenna GPS Antenna (UNSGSM V2.4) Firmware upgrade Nominal upgrade procedure Backup procedure Appendix Abbreviations VK-401A 4

5 1. Product description The new UNSGSM V2.X made by Unitronic AG exists in 4 different variations. It is an innovative versatile GSM/GPRS socket modem. The application range comprised from sending data per sms, datacall or GPRS connection. The variation 2.4 enables a highly accurate determination of position through the included SiRFstarIV chipset. The UNSGSM V2.X bases on the SL6087-Modul by Sierra Wireless which is equipped with an ARM9 controller. By using the related software suite, programs can be developed, programmed and executed in ANSI standard Main functions overview GSM/GPRS Features UNSGSM V2.X is a self-contained GSM/GPRS (850/900/1800/1900) MHz Quad-Band modem including the following GSM/GPRS features: Quad-Band (850/900/1800/1900) E-GSM/DCS/GSM/GPRS/EGPRS Full set of AT commands for GSM/GPRS/EGPRS including GSM and AT command sets GSM class 1 (1W) and class 4 (2W), Fax Group 3 compatible GPRS multi-slot class 10 and class 2, PBCCH support SMS features including text and PDU, point to point, cell broadcast Data circuit asynchronous, transparent, and non-transparent up to bits/s ME + SIM phone book management 1.8V/3V SIM interface, SIM Tool Kit Release 99 SIM, networks and service provider locks Real Time Clock (RTC) with calendar and alarm 0051-VK-401A 5

6 GPS features (UNSGSM V2.4) The UNSGSM V2.4 modem is equipped with the GPS module Jupiter-F2 from Telit. The communication link between internal GSM module and GPS module is done via the UART2 interface. Features SiRFstarIV architecture 48-Channel GPS Receiver Tracking Sensitivity of -163dBm Integrated LNA Active 8 Jammer Remover Assisted GPS supported SBAS supported (WAAS, EGNOS, MSAS and GAGAN) Accuracy Horizontal accuracy:<2,5 m (CEP), 5,5 m 2dRMS Velocity accuracy: speed <0,01 m/s; heading <0,01 Acquisition performance dbm Mode Typical 90% Hot start TTFF 500 ms < 1 s Warm start TTFF 31 s 35 s Cold start TTFF 33 s 35 s *TTFF Time to first fix 0051-VK-401A 6

7 Hardware Features 5V power supply 3.3V or 5V digital I/O s 2 UART s up to 921kbit/s SPI / I2C bus interface up to 9 GPIO s Interface for speech communication U.FL RF Connector 3V/1.8V SIM-card reader or SIM-Chip, SIM Interface A-GPS Versions and Features Versions and Features SIM-Slot UART1 UART2 SPI I²C on the bottom SIM-Slot on the top SIM Interface SIM-Chip GPS UNSGSM V2.1 UNSGSM V2.2 UNSGSM V2.3 UNSGSM V Software Features Standard 3GPP AT Commands Echo cancellation + noise reduction Real Time Clock (RTC) with calendar Full Quadband EDGE DTMF dialling Management Services TCPIP/Internet as Library and PlugIn OpenAT Developer Studio C/C++ Low Power consumption modes Jamming Detection Security library for internet applications (SSL) 0051-VK-401A 7

8 1.2. External connections Power supply and digital-i/o s The connection for the power supply and all digital I/O s are carried out on pin headers with 2mm pitch. This connections support the interfaces Power supply RTC backup supply Two UART s V24 Audio SPI / I 2 C bus GPIOs SIM Interface (V2.3) GSM indicator Logic Level Control Reset Boot SIM-card Reader The UNSGSM modem has a built-in SIM-card reader on board. This interface controls 3V / 1V8 SIM-cards. It is fully compliant with GSM recommendations concerning SIM functions. The following signals are supported on the pins of the SIM-card reader: PIN # I/O I/O Type Description SIM-VCC 1 I 2V9 / 1V8 SIM Power Supply SIM-RST 2 I 2V9 / 1V8 SIM Reset SIM-CLK 3 I 2V9 / 1V8 SIM Clock SIM-GND 5 I SIM GND SIM-IO 7 I/O 2V9 / 1V8 SIM Data SIM-PRES 4 O 1V8 SIM Card Detect The UNSGSM V2.3 has an additional SIM Interface carried out to the Pin header. For detailed information s please read chapter VK-401A 8

9 SIM-Chip (UNSGSM V2.2) The Embedded SIM-Chip is specially designed for Machine-to-Machine (M2M) applications. Highlights Extreme environmental conditions: Temperature, -40 C to +85 C Shock Humidity Corrosion Extreme Electrical Conditions Long life, >10 years at -40 C to 85 C High stress memory (HSM) supports >2M E/W cycles per file Outside of HSM 500K E/W cycles Simplified logistics Embedded SIM eliminates or reduces the logistics challenges represented by physical SIM cards, such as inventory management, secure storage and activation VK-401A 9

10 2. Interface description 2.1. Interface block diagram The following illustrations show all available interface connections of the different UNSGSM SocketModem versions VK-401A 10

11 2.2. Socket pin out The following illustrations show the pin configurations of the UNSGSM SocketModem of the different versions VK-401A 11

12 2.3. Pin Overview and Description Pin Out Overview Pin # UNSGSM_V2.1 UNSGSM_V2.2 UNSGSM_V2.3 UNSGSM_V GPIO1/SCL GPIO1/SCL SIM_PRES GPIO1/SCL 19 GPIO2/SDA GPIO2/SDA SIM_VCC GPIO2/SDA 20 GPIO17/RTS2 GPIO17/RTS2 GPIO17/RTS2 NC 21 GPIO16/CTS2 GPIO16/CTS2 GPIO16/CTS2 NC 22 GPIO14/TXD2 GPIO14/TXD2 GPIO14/TXD2 NC 23 GPIO15/RXD2 GPIO15/RXD2 GPIO15/RXD2 NC 24 RST RST RST RST 25 BOOT BOOT BOOT BOOT 26 DGND DGND DGND DGND 27 LCC LCC LCC LCC 28 FLASH_LED FLASH_LED FLASH_LED FLASH_LED 33 RTS RTS RTS RTS 34 RXD RXD RXD RXD 35 TXD TXD TXD TXD 36 RI RI RI RI 37 DSR DSR DSR DSR 38 CTS CTS CTS CTS 39 DCD DCD DCD DCD 40 DTR DTR DTR DTR 41 DGND DGND DGND DGND 42 GPIO12/SPI-CLK GPIO12/SPI-CLK SIM_CLK GPIO12/SPI-CLK 43 GPIO13/SPI-IO GPIO13/SPI-IO SIM_IO GPIO13/SPI-IO 44 GPIO19/SPI-I GPIO19/SPI-I SIM_RST GPIO19/SPI-I 60 VCC_RTC VCC_RTC VCC_RTC VCC_RTC 61 VCC VCC VCC VCC 62 MIC MIC MIC MIC 63 AGND AGND AGND AGND 64 SPKR SPKR SPKR SPKR 0051-VK-401A 12

13 Pin Description of UNSGSM V2.1 and V2.2 Modems The following table describes the signals of the 64 pol pin header of the UNSGSM V2.1 and V2.2 modems. Pin# Name Direction* I/O Type Description Comment 18 GPIO1/SCL I/O Push Pull I²C Clock Left open when not used 19 GPIO2/SDA I/O Push Pull I²C Data Left open when not used 20 GPIO17/RTS2 I/O Push Pull Auxiliary UART2 Request To Send Left open when not used 21 GPIO16/CTS2 I/O Push Pull Auxiliary UART2 Clear To Send Left open when not used 22 GPIO14/TXD2 I/O Push Pull Auxiliary UART2 Transmit Left open when not used 23 GPIO15/RXD2 I/O Push Pull Auxiliary UART2 Receive Left open when not used 24 RST I/O Open Drain RESET Input Active low 25 BOOT I C MOS Internal ROM BOOT Active low 26 DGND PWR Supply Digital GND High current 27 LCC I C MOS Logic Level Control low=5.0v / high=3.6v 28 FLASH_LED O C MOS LED Output Active high 33 RTS I C MOS Main UART1 Request To Send Active low 34 RXD O C MOS Main UART1 Receive Active low 35 TXD I C MOS Main UART1 Transmit Active low 36 RI O C MOS Main UART1 Ring Indicator Active low 37 DSR O C MOS Main UART1 Data Set Ready Active low 38 CTS O C MOS Main UART1 Clear To Send Active low 39 DCD O Push Pull Main UART1 Data Carrier Detect Active low 40 DTR I C MOS Main UART1 Data Terminal Ready Active low 41 DGND PWR Supply Digital GND High current 42 GPIO12/SPI-CLK I/O Push Pull SPI Clock Left open when not used 43 GPIO13/SPI-IO I/O Push Pull SPI MOSI Left open when not used 44 GPIO19/SPI-I I/O Push Pull SPI MISO Left open when not used 60 VCC_RTC PWR Supply RTC Battery connection Left open when not used 61 VCC PWR Supply Main Supply (+5.0V nom) High current 62 MIC I Analog Microphone input single ended 63 AGND PWR Supply Analog GND High current 64 SPKR O Analog Speaker output single ended * The I/O direction information is only for the nominal signal. When the signal is configured in GPIO, it can always be an Input or an Output VK-401A 13

14 Pin Description of UNSGSM V2.3 Modem The following table of contents describes the signals of the 64 pol pin header of the UNSGSM V2.3 modem. Pin# Name Direction* I/O Type Description Comment 18 SIM_PRES I 1V8 SIM Card Detect Left open when not used 19 SIM_VCC O 2V9 / 1V8 SIM Power Supply Left open when not used 20 GPIO17/RTS2 I/O Push Pull Auxiliary UART2 Request To Send Left open when not used 21 GPIO16/CTS2 I/O Push Pull Auxiliary UART2 Clear To Send Left open when not used 22 GPIO14/TXD2 I/O Push Pull Auxiliary UART2 Transmit Left open when not used 23 GPIO15/RXD2 I/O Push Pull Auxiliary UART2 Receive Left open when not used 24 RST I/O Open Drain RESET Input Active low 25 BOOT I C MOS Internal ROM BOOT Active low 26 DGND PWR Supply Digital GND High current 27 LCC I C MOS Logic Level Control low=5.0v / high=3.6v 28 FLASH_LED O C MOS LED Output Active high 33 RTS I C MOS Main UART1 Request To Send Active low 34 RXD O C MOS Main UART1 Receive Active low 35 TXD I C MOS Main UART1 Transmit Active low 36 RI O C MOS Main UART1 Ring Indicator Active low 37 DSR O C MOS Main UART1 Data Set Ready Active low 38 CTS O C MOS Main UART1 Clear To Send Active low 39 DCD O Push Pull Main UART1 Data Carrier Detect Active low 40 DTR I C MOS Main UART1 Data Terminal Ready Active low 41 DGND PWR Supply Digital GND High current 42 SIM_CLK O 2V9 / 1V8 SIM Clock Left open when not used 43 SIM_IO I/O 2V9 / 1V8 SIM Data Left open when not used 44 SIM_RST O 2V9 / 1V8 SIM Reset Left open when not used 60 VCC_RTC PWR Supply RTC Battery connection Left open when not used 61 VCC PWR Supply Main Supply (+5.0V nom) High current 62 MIC I Analog Microphone input single ended 63 AGND PWR Supply Analog GND High current 64 SPKR O Analog Speaker output single ended * The I/O direction information is only for the nominal signal. When the signal is configured in GPIO, it can always be an Input or an Output VK-401A 14

15 Pin Description of UNSGSM V2.4 Modem The following table of contents describes the signals of the 64 pol pin header of the UNSGSM V2.4 modem. Pin# Name Direction* I/O Type Description Comment 18 GPIO1/SCL I/O Push Pull I²C Clock Left open when not used 19 GPIO2/SDA I/O Push Pull I²C Data Left open when not used 20 NC 21 NC 22 NC 23 NC 24 RST I/O Open Drain RESET Input Active low 25 BOOT I C MOS Internal ROM BOOT Active low 26 DGND PWR Supply Digital GND High current 27 LCC I C MOS Logic Level Control low=5.0v / high=3.6v 28 FLASH_LED O C MOS LED Output Active high 33 RTS I C MOS Main UART1 Request To Send Active low 34 RXD O C MOS Main UART1 Receive Active low 35 TXD I C MOS Main UART1 Transmit Active low 36 RI O C MOS Main UART1 Ring Indicator Active low 37 DSR O C MOS Main UART1 Data Set Ready Active low 38 CTS O C MOS Main UART1 Clear To Send Active low 39 DCD O Push Pull Main UART1 Data Carrier Detect Active low 40 DTR I C MOS Main UART1 Data Terminal Ready Active low 41 DGND PWR Supply Digital GND High current 42 GPIO12/SPI-CLK I/O Push Pull SPI Clock Left open when not used 43 GPIO13/SPI-IO I/O Push Pull SPI MOSI Left open when not used 44 GPIO19/SPI-I I/O Push Pull SPI MISO Left open when not used 60 VCC_RTC PWR Supply RTC Battery connection Left open when not used 61 VCC PWR Supply Main Supply (+5.0V nom) High current 62 MIC I Analog Microphone input single ended 63 AGND PWR Supply Analog GND High current 64 SPKR O Analog Speaker output single ended * The I/O direction information is only for the nominal signal. When the signal is configured in GPIO, it can always be an Input or an Output VK-401A 15

16 2.4. Function description This following chapter describes the functions and the handling of the interfaces of the SocketModem. You should follow this information to design your own application Power supply The power supply is one of the key issues in the design of a GSM / GPRS application. Please read the description of the electrical characteristics for the power supply of the SocketModem in chapter 3.1. There you will find all important information you have to know to supply the SocketModem correctly. The power ON sequence is completed after 1500ms. During the power ON sequence, no functions of the SocketModem are available RTC supply For applications which require accurate clock or alarm management, the SocketModem includes an internal Real Time Clock. To save date and time when the SocketModem is powered of, you have to supply the SocketModem with a backup power supply at the pin number 60. This pin is used as backup power supply for the internal Real Time Clock. The RTC is supported by the SocketModem when VCC is available, but a backup power supply is needed to save date and time when VCC is switched off (VCC = 0V). If RTC is not used, this pin can be left open. If VCC is available, the back-up battery can be charged by the internal 2,5V power supply regulator. The back-up power supply can be provided by any of the following: A super capacitor A non-rechargeable battery A rechargeable battery Parameter Min Typ Max Unit Input voltage 1,85 3,0 V Input current consumption* 3,0 3,3 3,6 µa Output voltage 2,4 2,45 2,5 V Output current 2 ma * Provided by an RTC back-up battery when the SocketModem power supply is off (VCC = 0V) VK-401A 16

17 Main Serial Link (UART1) The main serial link is used for communication between the SocketModem and a PC or host processor. A flexible 8 wire serial interface is available complying to V24 protocol signalling. In particular, it is necessary to use the RTS/CTS hardware flow control signals in order to not lose data. This digital I/O s provide two different logic levels which can be selected with the LLC Pin number 27. For detailed information s please read chapter The maximum baud rate of UART1 is 921kbps. SIGNAL PIN Signal Name / description Request To Send RTS is used to condition the local modem for data transmission and, during half-duplex operation, to control the direction of data transmission. On a full-duplex channel, RTS OFF maintains the modem in a non- transmit mode. A nontransmit mode does not imply that all GSM / GPRS signals have been removed from the RTS 33 link. RTS OFF may be ignored if the modem is optioned to strap CTS ON; this allows the modem to receive from the DTE even trough RTS is OFF. RTS input ON causes the modem to transmit data on TxD when ~CTS become active. RxD 34 TxD 35 RI 36 DSR 37 CTS 38 DCD 39 DTR 40 Received Data The modem uses the RxD line to send data received from the telephone line to the DTE and to send modem responses to the DTE. Modem response take priority over incoming data when the two signals are in competition for RxD. Transmitted Data The DTE uses the TxD line to send data to the modem for transmission over the telephone line or to transmit commands to the modem. The DTE should hold this circuit in the mark state when no data is being transmitted or during intervals between characters. Ring Indicator RI output ON (low) indicates of an incoming call. Data Set Ready DSR indicates modem status to the DTE. DSR OFF (high) indicates that the DTE disregards all signals appearing on the interchange circuits except Ring Indicator (RI). DSR output is controlled by the AT&S command. Clear To Send CTS is controlled by the modem to indicate whether or not the modem is ready to transmit data. CTS ON, together with the RTS ON, DSR ON, and DTR ON (where implemented), indicates to the DTE that the TxD will transmit data. CTS OFF indicates to the DTE that it should not transfer data across the interface on TxD. CTS ON is a response to DTR ON and ~RTS, delayed as may be appropriate for the modem to establish a connection. Data Carrier Detect When AT&C0 command is not in effect, DCD output is ON when a link is established or OFF when no link is established. DCD can be strapped ON using AT&C command. Data Terminal Ready The DTR input is turned ON (low) by the DTE when the DTE is ready to transmit or receive data. DTR ON prepares the modem to be connected and maintains the connection established by the DTE (manual answering) or internally (automatic answering). DTR OFF places the modem in the disconnect state under control of the AT&D command. The effect of DTR ON and DTR OFF depends on the AT&Dn command. The response of the modem to the DTR signals is very slow (up to 10ms) to prevent noise from falsely causing the modem to disconnect from the telephone line VK-401A 17

18 Auxiliary Serial Link (UART2) The auxiliary serial link (UART2) is used for communications between the SocketModem and external devices. It consists of a flexible 4-wire serial interface that complies with V24 protocol signalling. This digital I/O s provide two different logic levels which can be selected with the LLC Pin number 27. For detailed information s please read chapter The maximum baud rate of UART1 is 921kbps SIM interface (UNSGSM V2.3) The SIM may be directly connected to the UNSGSM V2.3 Modem via this dedicated interface. This interface controls either a 3V or a 1V8 SIM and it is fully compliant with GSM recommendations concerning SIM functions. The five signals used by this interface are as follows: Pin# Signal I/O I/O Type Description Multiplexed with 18 SIM-PRES I 1V8 SIM Card Detect Not mux 19 SIM-VCC O 2V9 / 1V8 SIM Power Supply Not mux 42 SIM-CLK O 2V9 / 1V8 SIM Clock GPIO18 43 SIM-IO I/O 2V9 / 1V8 SIM Data Not mux 44 SIM-RST O 2V9 / 1V8 SIM Reset Not mux Warning: Do not use together the SIM-card Reader and the SIM interface! Both are internally connected! SPI / I2C bus It is possible to connect the modem to a LCD module driver or to any integrated circuit through either an SPI bus or a two wire interface, the I 2 C bus. SPI Bus The SPI bus interfaces include: A CLK signal (SPI-CLK) A MOSI signal (SPI-IO) A MISO signal (SPI-I) GPIOx as CS Features: Master mode operation The CS signal must be any GPIO SPI speed is from 102Kbit/s to 13Mbit/s in master mode operation 3 or 4-wire interface 1 to 16 bits data length 0051-VK-401A 18

19 I2C Bus The I2C Bus interface includes a CLK signal (SCL, Pin 18) and a data signal (SDA, Pin 19) complying with a 100kbit/s standard interface (standard mode: s-mode). The I2C bus is always in master mode operation. The maximum transfer speed is 400Kbit/s (fast mode: f- mode) Audio Interface For any application which recommends speech communication this modem contains an interface for a microphone and a speaker. It is useful for monitoring the modem s callprocess tones and modem system debugging, as well for full featured voice applications. To avoid any disturbance on the audio path, be sure to have a very good ground plane and a very good filtering as well as shielding. The gain of the speaker output and the microphone input is internally adjusted and can be tuned using by the AT-commands. Signal Pin Description MIC 62 AGND 63 Microphone Voice Input MIC is a single-ended microphone input from the analog circuit. Analog Ground If a microphone or a headset is used, use this as a ground. If this are never used, it should be connected to DGND. SPKR 64 Speaker Output SPKR is a single ended output for speaker VK-401A 19

20 GPIOs One connection of the modem is the GPIO interface. It provides up to 9 General Purpose I/Os. It is enabled to read or write logic states on these I/Os with AT-commands. They are able to control any external device such as a LCD backlight or an antenna switch. This digital I/O s provide two different logic levels (5V0 or 3V3) which can be selected with the LLC Pin number 27. For detailed information s please read chapter Pin# Signal I/O Reset State Multiplexed with 18 GPIO1 I/O High SCL 19 GPIO2 I/O High SDA 20 GPIO17 I/O High RTS2 21 GPIO16 I/O High CTS2 22 GPIO14 I/O High TXD2 23 GPIO15 I/O High RXD2 42 GPIO12 I/O High SPI-CLK 43 GPIO13 I/O High SPI-IO 44 GPIO19 I/O High SPI-I Internal GPIOs The SocketModem provides in total 6 internal General Purpose I/Os. These can be used to control a GPS Modem and Pins 18 to 23. Signal Control GPIO23 pins I/O Activ Description O low When the GPIO23 is low, pins are placed in the highimpedance state. GPIO22 GPS-ANT VCC GPIO25 GPS MOD VCC GPIO21 GPS MOD BOOT O high 3V3 Supply for active GPS antenna O high O high GPIO24 GPS MOD ON-OFF O high GPIO3 GPS System-ON I high This controls the primary supply voltage for the GPS module. When the GPIO23 is high, putting the GPS-module into internal BOOT mode for firmware flashing. This control output signal is used to turn ON and turn OFF the GPS receiver. This is an active high indication that the GPS system is ready to receive an ON pulse or that the system is ON and running VK-401A 20

21 FLASH-LED This Output can be used to drive an extern LED to indicate the modem s activity status. It is high active and an extern LED should be used with a serial 1K resistor in line to this output. Four states can be indicated: LED Status OFF ON MODEM STATUS Modem in download mode or modem OFF Permanent ON; not registered on the network Slow flash LED ON for 200ms, OFF for 2s Quick flash LED ON for 200ms, OFF for 600ms Very quick flash LED ON for 100ms, OFF for 200ms ON; registered on the network ON; registered on the network, communication in progress ON; software downloaded is either corrupted or non-compatible ("BAD SOFTWARE") Logic Level Control LLC For different hardware requirements, the modem support two different logic levels which can be set via hardware access on the pin number 27. This input controls the voltage logic level on the modem s I/Os. So it enables you to drive the extern hardware/periphery with 3.3V or 5.0V logic levels. For this setting you can connect this input directly to VCC or GND and do not have to use pull-up or pull-down resistors. STATE PIN I/O S STATE logic low Each digital I/O works with 5.0 V logic logic high Each digital I/O works with 3.3 V logic 0051-VK-401A 21

22 Reset signal ~RST This signal is used to force a reset procedure by providing low level for at least 200µs. This signal has to be considered as emergency reset only. A reset procedure is already driven by an internal hardware during the power-up sequence. This signal can also be used to provide a reset to an external device. In this case it functions as an output. If no external reset is necessary this input can be left open. For a hardware reset connect the pin number 24 directly to GND. During the power ON sequence, an internal reset is automatically performed by the SocketModem for 40ms (typical). During this phase, any external reset should be avoided. PIN# Signal I/O I/O Type VIH(min) VIL(max) 24 ~RESET I/O, Open Drain 1V8 1,33 V 0,57 V Boot signal This input can be used to adjust the SocketModem to download mode in order to download firmware into the Flash memory of the SocketModem. For the applications based on AT-Commands this is a backup download procedure only. The internal boot procedure is started when the pin number 25 is low during a reset procedure. In nominal mode this pin has to be left open. The internal boot procedure can only be used in addition to special software delivered by the UNITRONIC. For a nominal upgrade procedure please use terminal software to update the firmware by using the X-modem protocol. You do not have to pull down the Boot pin for a firmware upgrade by terminal software. In the chapter 4.6 you will find detailed information for the firmware upgrade VK-401A 22

23 3. Electrical Specifications All the electrical characteristics of the UNSGSM modem are presented in the following chapter Power supply electrical characteristics Two different inputs are given for the power supply. The first one, named VCC is the main power supply used to supply the modem over pin number 61. The second one is used to supply the Real Time Clock over pin number 60 with a back - up power supply which is required to save date and time when the modem is switched off. Due to the burst emission in GSM/GPRS, the power supply must be able to deliver high current peaks for a short time. During these peaks the ripple voltage and the drop voltage on the supply must not exceed a certain limit. In transition mode, a GSM/GPRS class 2 terminal emits (1Tx) 577µs radio burst every 4.615ms. GPRS class 10 terminals emit 1154µS radio bursts every 4.615ms. It is essential to minimize the voltage ripple at this connection in order to avoid phase errors. The RF Power Amplifier current (max 2A peak in GSM/GPRS mode) flows with a ratio of 1/8 of the time, around 577µs every 4.615ms for GSM/GPRS class 2. The rising time is around 10µs. The ground connection has to be connected via the pins number 26, 41 and 63 on the mother board trough a complete layer on the PCB VK-401A 23

24 Power supply voltage Only VCC (external power supply source) input is necessary to supply the SocketModem. Description Pin V min V nom V max Ipeak Main Supply V 5.0V 5.25V 2,0A GND 26,41,63 / / / / The SocketModem does not include any protection against over voltage. Make sure that during the burst emission the total drop in voltage is not bigger than the needed supply voltage of 4,0V otherwise the UNSGSM SocketModem will power down automatically Power Consumption modes The SocketModem can work in different modes. Each one is characterized by: power consumption Open AT power processing feature availability ACTIVE mode In ACTIVE mode, the embedded module is fully powered and all services are available. There are two varieties of ACTIVE mode status based on the GSM stack as described below. ACTIVE mode with GSM stack in idle This is the default mode for the SocketModem. To switch the SocketModem to this mode use "AT+WBHV=1,0" command. The embedded module must be restarted in order to take the new behaviour into account. No features are restricted in this mode VK-401A 24

25 ACTIVE mode with GSM stack turned off In this mode, the SIM device and GSM/GPRS features (like GSM voice or data call, SMS, GPRS data transfer) are not available. The embedded application is running and the serial port remains active, meaning AT commands are available. If any data has to be transmitted over the network, this mode has to be turned off. To switch the SocketModem to this mode use "AT+WBHV=1,1" command. The SocketModem must be restarted in order to take the new behaviour into account. To disable this mode, use the "AT+WBHV=1,0" command and restart the embedded module. To turn off and on the GSM stack without any reset, use commands AT+CFUN=1,0 and AT+CFUN=0,0. SLEEP mode In SLEEP mode, the SocketModem is fully powered but the internal processor is in sleep state for a low power consumption mode. The software is suspended, waiting for RTC alarm expiration, TCU timer expiration, wireless paging (if GSM stack is enabled), external IT, keypad press, UART DTR drop, or USB resume, removing it from this state. There are two varieties of SLEEP mode status based on the GSM stack as described below. SLEEP mode with GSM stack in idle This mode is a low power consumption mode. In this mode the SocketModem has restricted access to peripheral interfaces UARTs, SPIs, I2C, and GPIOs which are not available. To enable or disable this mode use AT+W32K command. The mode activation and deactivation is initiated when the customer device is connected to the serial interface (DTE). DTR pin must be pulled UP for requesting activation of the SLEEP mode with GSM stack in idle. To deactivate this mode DTR pin must be pulled DOWN. When this mode is activated, the embedded module requires 1 to 15 seconds to power down energy consumption. Then, the SocketModem can automatically wake up on unsolicited events such as: GSM paging external interruption key press alarm Open AT timer expiration During the wake up period, the SocketModem will have the same characteristic as the ACTIVE mode with GSM stack in idle in terms of power consumption and Open AT power processing. The embedded module automatically switches back to idle state after all Open AT treatments VK-401A 25

26 SLEEP mode with GSM stack turned off This mode is a low power consumption mode. In this mode, SIM device and GSM/GPRS features like GSM voice or data call, SMS, GPRS data transfer are not available. In addition, the embedded module has restricted access to peripheral interfaces UARTs, SPIs, I2C and GPIOs which are not available. In this mode, the SocketModem can automatically wake up on unsolicited events such as: external interruption key press alarm Open AT timer expiration During the wake up period, the SocketModem has the same characteristics as the ACTIVE mode in terms of power consumption and Open AT power processing. The SocketModem automatically switches back to idle state after all Open AT treatments. To switch the SocketModem to this mode, use "AT+WBHV=1,2" command. The SocketModem must be restarted in order to take the new behaviour into account. To disable this mode, use "AT+WBHV=1,0" command and restart VK-401A 26

27 Power consumption All measurements are made without any periphery connections. Power consumption for TA 25 C to +85 C Operating mode Parameter SLEEP mode ACTIVE mode SLEEP mode with telecom stack in Idle Mode ACTIVE mode with telecom stack in Idle Mode Peak current in GSM/GPRS Mode Paging 9/Rx burst occurrence ~2s Paging 2/Rx burst occurrence ~0,5s Paging 9/Rx burst occurrence ~2s Paging 2/Rx burst occurrence ~0,5s 850/900 MHz - PCL5/gam.3 (TX power 33dBm) 1800/1900 MHz - PCL0/gam.3 (TX power 30dBm) 850/900 MHz - PCL5 (TX power 33dBm) IAverage IPeak Unit TBD TBD ma TBD TBD ma TBD TBD ma TBD TBD ma TBD TBD ma TBD TBD ma ma ma ma GSM Connected Mode (Voice) 850/900 MHz - PCL19 (TX power 5dBm) 1800/1900 MHz - PCL0 (TX power 30dBm) ma ma 1800/1900 MHz - PCL15 (TX power 0dBm) ma GPRS Transfer Mode class 10 (3Rx/2Tx) 850/900 MHz - gam.3 (TX power 30dBm) ma EGPRS Transfer Mode class 10 (3Rx/2Tx) 850/900 MHz - gam.6 (TX power 24dBm) 1800/1900 MHz - gam.5 (TX power 23dBm) ma ma TX means that the peak current is measured during a TX transmission burst RX means that the peak current is measured during a RX reception burst 0051-VK-401A 27

28 Digital Interface electrical characteristics Two different logic voltage levels are supported on the digital interfaces to provide extern logic devices with 3.3V or 5.0V logic level. These two operation states have to be set via extern hardware access at the Logic Level Control pin number 27 at the UNSGSM modem. In the following tables the electrical characteristics of the different logic levels are shown. These characteristics are subdivided into two different I/O types: Advanced CMOS technology called CMOS Push-Pull vs. Open-Drain Driving called Push Pull CMOS I/O Type All this digital I/O s are fabricated with advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. These inputs tolerate voltages up to 5.5V and do not depend of the selected logic voltage level with the LLC-pin number 27. In difference to the output voltage level the maximum limit depends on the selected logic voltage level at the LLC-pin number 27. DC electrical characteristics with 3.3V LL and 5.0V LL logic level for TA 25 C to +85 C Symbol Parameter Logic Min Max Units VIH HIGH Level Input Voltage 2 5,5 V VIL LOW Level Input Voltage 0,8 V VOH HIGH Level Output Voltage 3,3 / 5,0 2,2 3,3 / 5,0 V VOL LOW Level Output Voltage 3,3 / 5,0 0,55 V IOL/H LOW / HIGH Level Output Current 20 ma CIN Input Capacitance 7 pf COUT Output Capacitance 8 pf 0051-VK-401A 28

29 Push Pull I/O Type These I/Os may be driven in a push-pull configuration. The socket s intern logic devices, which manage these digital logic I/Os includes internal 10k resistors that pull up I/O VL and I/O VH to their respective power supplies, allowing operation of the I/O lines with opendrain devices. See electrical characteristics for maximum data rates when using open-drain drivers. DC electrical characteristics with 3.3V LL and 5.0V LL logic level for TA +25 C Symbol Parameter Conditions Logic Level Min Max Units VIH HIGH Level Input Voltage I/O source current=20µa VLL 0.4 VLL V VIL LOW Level Input Voltage I/O source current=20µa 0 0,15 V VOH HIGH Level Output Voltage I/O source current=20µa 3.3 / 5.0 VLL x 0.8 V VOL LOW Level Output Voltage I/O source current=1ma 3.3 / 5.0 0,4 V Maximum Data Rate Push-pull driving 13 Mbps Maximum Data Rate Open-drain driving 2 Mbps 0051-VK-401A 29

30 3.2. Audio interface electrical characteristics Microphone Input MIC The microphone input is a single ended connection with a phantom feeding voltage of 1.7V. Signal Parameter Value Input Impedance >10kΩ MIC AC Input Voltage Range 1,1V P-P Reference Voltage +1,35VDC Recommended characteristics for the microphone are given: 2V 0.5mA Impedance: kohms Sensitivity 40dB to 50dB SNR > 50dB Speaker Output SPKR The speaker output is a single ended connection. There it is possible to directly connect a speaker with an impedance of 32 Ohms. Signal Parameter Value Output Impedance 10 Ω AC Output Voltage Range 1,4V P-P SPKR Reference Voltage +1,35VDC DC Offset Voltage ±20mV Minimum Load 300 Ω Maximum Capacitive Load 0,01µF 0051-VK-401A 30

31 3.3. SIM interface electrical characteristics Parameter Conditions Min Typ Max Unit SIM-IO VIH I IH = ±20µA 0,7xSIMVCC V SIM-IO VIL I IL =1mA 0,4 V SIM-RST, SIM-CLK VOH Source current = 20μA 0,9 x SIMVCC V SIM-IO VOH Source current = 20μA 0,8 x SIMVCC V SIM-RST, SIM-IO, SIM-CLK VOL Sink current = -200μA 0,4 V SIM-VCC Output Voltage SIMVCC = 2.9V IVCC= 1mA SIMVCC = 1.8V IVCC= 1mA 2,84 2,9 2,96 V 1,74 1,8 1,86 V SIM-VCC current 10 ma SIM-CLK Rise/Fall Time 20 ns SIM-RST, Rise/Fall Time 20 ns Loaded with 30pF SIM-IO Rise/Fall Time 0,7 1 µs SIM-CLK Frequency 3,25 MHz 0051-VK-401A 31

32 3.4. RF interface The impedance is 50 Ω nominal and the DC impedance is 0 Ω. The antenna cable and connector should be chosen on order to minimize losses in the frequency bands. 0.5 db can be considered the maximum value for loss between the SocketModem and an external connection GSM/GPRS RF performances RF performances are compliant with ETSI GSM recommendations. The main parameters for this receiver are: GSM850 Reference Sensitivity = -109 dbm typical (Static& TUHigh) E-GSM900 Reference Sensitivity = -109 dbm typical (Static& TUHigh) PCS1800 Reference Sensitivity = -108 dbm typical (Static& TUHigh) PCS1900 Reference Sensitivity = -108 dbm typical (Static& TUHigh) 200 khz: > +9 Dbc 400 khz: > +41 Dbc Linear dynamic range: 63 db Co-channel: rejection: >=9 dbc And for transmitter: Maximum output power (EGSM & GSM850): 33dBm +/-2 db at ambient temperature. Maximum output power (GSM1800 & PCS1900): 30dBm +/-2 db at ambient temperature. Minimum output power (EGSM & GSM850): 5dBm +/-5 db at ambient temperature. Minimum output power (GSM1800 & PCS1900): 0dBm +/-5 db at ambient temperature GPS RF Performance The RF connection for the external antenna has a characteristic impedance of 50 ohms. Sensitivity: Acquisition: -148 dbm Navigation: -160 dbm Tracking: -163 dbm 0051-VK-401A 32

33 4. Design guidelines 4.1. Physical specifications Temperature range All variants of UNSGSM Modem complies with the following operating temperature ranges: Conditions Operating / Class A Temperature Range Definition -30 C to +70 C The SocketModem remains fully functional during and after environmental exposure; and shall meet the minimum requirements of 3GPP or appropriate wireless standards. Operating / Class B Storage -40 C to +85 C -40 C to +85 C The SocketModem remains fully functional during and after environmental exposure; and shall exhibit the ability to establish a voice, SMS or DATA call at all times even when one or more environmental constraint exceeds the specified tolerance. Unless otherwise stated, full performance should return to normal after the excessive constraint(s) have been removed Physical Weight Modem UNSGSM V2.1 UNSGSM V2.2 UNSGSM V2.3 UNSGSM V2.4 Physical Weight 18,5 gram TBD 18,5 gram 19,5 gram 0051-VK-401A 33

34 Technical drawing 0051-VK-401A 34

35 4.2. Power supply Due to the burst emission in GSM/GPRS, the power supply should be able to deliver high current up to 2A for a short time. The internal impedance of the power supply must be lower than 100 mω to limit voltage drop-out within emission burst. Make sure that during the burst emission the total drop in voltage should not set down the power supply below 4V otherwise the UNSGSM SocketModem will power down automatically. Linear regulation is recommended or PWM (Pulse Width Modulation) converter (usable) is preferred for low noise. You can use a normal fixed voltage series-regulator. This supply-regulator should be placed as close to the SocketModem as possible (5cm or nearer). The supply trace between the regulator and the SocketModem should be at least 4mm wide or better an entire layer. The total impedance of the supply line should be 214 Hz Grounding Pins 26, 41 and 63 are for grounding. Connect all of them to the same ground-layer or a big ground area on your board. The ground area should cover the area below and around the SocketModem and its voltage regulator completely. Make the connections as wide as possible VK-401A 35

36 4.4. RF Connection A GSM/GPRS antenna can be connected to the SocketModem via the U.FL connector and a GPS antenna can be connected to the SocketModem via the MMCX connector. MMCX U.FL 4.5. Antenna specifications GSM/GPRS Antenna The antenna must fulfil the following requirements. The optimum operating frequency depends on the application. A dual band, tri-band or quad-band antenna should operate in these frequency bands and have the following characteristics: CHARACTERISTIC EGSM 900 DCS 1800 GSM 850 PCS 1900 Frequency TX 880 to to to to 1910 Frequency RX 925 to to to to 1990 Impedance 50 Ω VSWR Rx/Tx max 1.5 : 1 Typical radiated gain 0 dbi in one direction at least We recommend a VSWR max. of 1.5:1 for the Rx and the Tx. All aspects of these specifications will be fulfilled even with a VSWR max of 2:1 for the Rx and the Tx VK-401A 36

37 GPS Antenna (UNSGSM V2.4) There are two major types of GPS antennas: passive and active. The active antenna has a built in LNA (Low Noise Amplifier) to increase the strength of the signal and to compensate the signal loss in a long cable connection. Active antenna An active antenna is a passive antenna with a built in LNA that requires a power supply. Active antennas are used when the antenna input is connected to the receiver through a coaxial cable (usually longer than 3 m) or any high loss transmission path. The GPS signals experience loss in the transmission path from the antenna. The loss is compensated by the antenna s LNA, which amplifies the signal before it enters the transmission path. Passive antenna A passive antenna does not require any power because it has no amplifier. This is not the best choice if signal strength is weak, however, it may be sufficient if the signal path is kept to a minimum (usually below 300 mm). Recommended GPS antenna characteristics Characteristic Active antenna Passive antenna Polarisation right-hand circular polarised Frequency range GHz +/ MHz Power supply 3,3V ---- DC current < 50mA at 3,3 VDC ---- Antenna gain to 5 dbi with 1 db loss (max)in connections Recommended External Gain 18 dbi ---- Axial ratio < 3 db < 3 db Output VSWR < Impedance 50 Ohms nominal 0051-VK-401A 37

38 4.6. Firmware upgrade The firmware of the SocketModem is stored in the flash memory and it can be upgraded easily. Two upgrade procedures are available: Nominal upgrade procedure Four signals are necessary to precede the download in X-Modem protocol. They are: RxD, TxD, RTS, CTS and the GND connection. The data configuration is 8 data bits, no parity and 1 stop bit. Make sure that this configuration is set, with the AT-Command AT+ICF=3,1 correctly. The firmware file can be downloaded into the modem using a terminal software e.g. Hyper Terminal or ZOC with the X-Modem protocol. To enter the download mode you have to send the AT-Command AT+WDWL. After this command, you first have to download the downloader file dwl.dwl and then the firmware file Rx.xx.x_sl6087.dwl. To finish the download do a software RESET with the AT-Command AT+CFUN=1. Now the SocketModem s firmware is upgraded Backup procedure If the nominal upgrade mode is not possible (due to critical corruption on the flash memory), a backup procedure is also available. It requires specific software to download the firmware file into the SocketModem. This tool has to be run on a MS Windows platform connected to the serial bus of the modem. It enables to manage up to 255 serial ports, so this procedure is usefull in case you want to program many SocketModems parallel at the same time. Four signals are necessary to precede the download in backup procedure. They are: RxD, TxD, RTS, CTS and the GND connection. For this download procedure, the modem s BOOT pin Nr: 25 has to be set low while powering on or resetting the SocketModem VK-401A 38

39 5. Appendix 5.1. Abbreviations AC AGND AT-Command CMOS CTS DC DCD DSR DTMF DTR E-GSM EN ETSI FAX GND GPI GPIO GPO GPRS GSM I 2 C IP ITU-T LCD LDO LED LLC ME Alternating Current Analog GrouND ATtention command Complementary Metal-Oxide Semiconductor Clear To Send Direct Current Data Carrier Detect Data Set Ready Dual Tone Multi Frequency Data Terminal Ready Extended GSM ENable European Telecommunications Standards Institute FAcsimile GrouND General Purpose Input General Purpose Input Output General Purpose Output General Packet Radio Service Global System for Mobil communications Inter-IC bus Internet Protocol International Telecommunication Union-Terminal-series Liquid Crystal Display Low-DropOut Light Emitting Diode Logic Level Control Mobile Equipment 0051-VK-401A 39

40 MIC PCB RF RI ROM RST RTC RTS RxD SIM SMS SPI SPKR TCP TxD UNSGSM VSWR Microphone Printed Circuit Board Radio Frequency Ring Indicator Read Only Memory ReSeT Real Time Clock Request To Send Receiving Data Subscriber Identification Module Short Massage Service Serial Peripheral Interface Speaker Transport Control Protocol Transmitting Data UNitronic Socket GSM modem Voltage Stationary Wave Ratio 0051-VK-401A 40

41 - End of document -