WISMO Quik Q25 series WISMO Quik Q2501 Customer Design Guidelines Reference : WM_PRJ_Q2501_PTS_002 Revision : 001 Date : March 2004 confidential © Page : 1 / 79 This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement. Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Document Information Revision 001 Date History of the evolution March 04 Preliminary version confidential © Page: 2 / 79 This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement. Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Overview The WISMO Quik Q2501 module is an E-GSM/DCS - GPRS 900/1800 MHz dual band module with 16 channels GPS receiver. It is dedicated to automotive applications, driven by AT commands. The WISMO Quik Q2501 memory configuration is: GSM/GPRS part: 32 Mbits of Flash memory and 4 Mbits of SRAM, GPS part: 8 Mbits of Flash memory. This document gives recommendations and general guidelines to design an application using the WISMO Quik Q2501 module.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Contents Document Information......................................................................... 2 Overview ............................................................................................. 3 Contents.............................................................................................. 4 Table of figures ................................................................................... 6 Cautions ..............................................
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.4.2 3.4.3 3.4.4 3.4.5 3.4.6 GPS serial links ..............................................................................48 Dead reckoning interface ...............................................................50 1.8 V Digital Power Supply for External Devices ............................52 GPS External Interruption ..............................................................52 GPS Antenna Power Supply ..........................................................
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Table of figures Figure 1: Functional architecture .................................................................... 16 Figure 2: Typical Power supply voltage in GSM/GPRS mode .......................... 18 Figure 3: RTC supplied by a super capacitor................................................... 20 Figure 4: RTC supplied by a non rechargeable battery.................................... 21 Figure 5: RTC supplied by a rechargeable battery cell ....................
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Figure 25: Example of buzzer implementation ................................................ 43 Figure 26: LED driven by the BUZ output ....................................................... 43 Figure 27: ~INTR driving example .................................................................. 45 Figure 28: Example of ADC application........................................................... 46 Figure 29: GPS activation function implementation ..........................
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Cautions Information furnished herein by Wavecom are accurate and reliable. However no responsibility is assumed for its use. Please read carefully the safety precautions for an application based on a WISMO Quik Q2501 module. In addition, Wavecom reserves the right to modify this information with an aim of improving the accuracy of information provided herein.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 1 References 1.1 Reference Documents [1] Automotive Environmental Control Plan for WISMO Quik Q2501 WM_PRJ_Q2501_DCP_001 [2] WISMO Quik Q2501 Product Technical Specification WM_PRJ_Q2501_PTS_001 [3] WISMO Quik Q2501 Process Customer Guidelines WM_PRJ_Q2501_PTS_003 1.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Term Definition Hot Start Start mode of the GPS receiver when current position, clock offset, approximate GPS time and current ephemeris data are all available. In Hot Start Scenario, the receiver was off for less than 2 hours. It uses its last Ephemeris data to calculate a position fix. Warm Start Start mode of a GPS receiver when current position, clock offset and approximate GPS time are known. Almanac data is retained, but the ephemeris data is cleared.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Abbreviation Definition CMOS Complementary Metal Oxide Semiconductor CS Coding Scheme CTS Clear To Send DAC Digital to Analogue Converter dB Decibel DC Direct Current DCD Data Carrier Detect DCE Data Communication Equipment DCS Digital Cellular System DR Dynamic Range DSR Data Set Ready DTE Data Terminal Equipment DTR Data Terminal Ready EFR Enhanced Full Rate E-GSM Extended GSM EMC ElectroMagnetic Compatibility EMI ElectroMagnetic Inter
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Abbreviation Definition MAX MAXimum MIC MICrophone MIN MINimum MMS Multimedia Message Service MO Mobile Originated MT Mobile Terminated NF Noise Factor NMEA National Marine Electronics Association NOM NOMinal PA Power Amplifier Pa Pascal (for speaker sound pressure measurements) PBCCH Packet Broadcast Control CHannel PC Personal Computer PCB Printed Circuit Board PDA Personal Digital Assistant PFM Power Frequency Modulation PSM Phase Shi
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Abbreviation Definition TBC To Be Confirmed TDMA Time Division Multiple Access TP Test Point TVS Transient Voltage Suppressor TX Transmit TYP TYPical UART Universal Asynchronous Receiver-Transmitter USB Universal Serial Bus USSD Unstructured Supplementary Services Data VSWR Voltage Stationary Wave Ratio confidential © Page: 13 / 79 This document is the sole and exclusive property of WAVECOM.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 2 General Information 2.1 Features WISMO Quik Q2501 is self-contained E-GSM/DCS-GPRS 900/1800 dual-band module with 16 bits GPS receiver. Following table reminds the WISMO Quik Q2501 features: Feature Information Physical characteristics Size: 58.4 x 32.2 x 6.3 mm. Weight: 11 g. Complete shielding. Module control Full set of AT commands for GSM/GPRS including GSM 07.07 and 07.05 AT command sets.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Feature Information GSM Supplementary Services Call Forwarding, Call Barring. Multiparty. Call Waiting, Call Hold. USSD. Data / Fax Data circuit asynchronous, transparent, and nontransparent up to 14400 bits/s. Fax Group 3 compatible. SIM interface 3 V only SIM interface. 1.8 & 5 V SIM interfaces are available with external adaptation. SIM Tool Kit Release 99. GPS GPS L1 civil frequency 1575.42 MHz. 16 channels GPS receiver. Accuracy: • 2.5 m CEP.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 2.2 Functional architecture POWER SUPPLY INTERFACE RF GSM FRONT END W I S M O GSM / GPRS Audio filter Q 2 5 0 1 BASEBAND GSM / GPS ANTENNA ANTENNAS S Y S T E M C N N E C T O R CONTROL GPS ANTENNA GSM Flash memory GPS BASEBAND RF PORTS RF GPS FRONT END GPS Flash memory Figure 1: Functional architecture confidential © Page: 16 / 79 This document is the sole and exclusive property of WAVECOM.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3 Functional Design Some of the WISMO interface signals are multiplexed in order to limit the number of pins but this architecture implies some restrictions. All external signals must be inactive when the WISMO module is OFF to avoid any damage when starting the module. 3.1 Power supply part 3.1.1 Main power supply and ground plane 3.1.1.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Vmax VBATT Uripp Uripp Vmin IBATT T=577µs T = 4.615ms Legend: In GSM or GPRS class 2 modes In GPRS class 10 mode Figure 2: Typical Power supply voltage in GSM/GPRS mode During these peaks the ripple (Uripp) on the supply voltage must not exceed a certain limit (refer to document [2]).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.1.1.2 Design requirements A Careful attention should be paid to: Quality of the power supply: o linear regulation (recommended) or PWM (Pulse Modulation) converter (usable) are preferred for low noise. o PFM (Power Frequency modulation) Modulation) systems must be avoided. or PSM (Phase Width Shift Capacity to deliver high current peaks in a short time (bursted radio emission).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.1.2 RTC Back-up supply 3.1.2.1 Design requirements VCC_RTC pin is used to provide a back-up power supply for the internal Real Time Clock (RTC). The RTC is supported by the WISMO Quik Q2501 module when powered on, but a back-up power supply is needed to save date and time information when the module is switched off. If the RTC is not used this pin can be left open.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.1.2.2.2 WISMO Q2501 Non Rechargeable battery VCC_RTC 1 3 10 Ω BAS16 Ex: Varta CR2016 GND Figure 4: RTC supplied by a non rechargeable battery Estimated range with 85 mAh battery: 800 h min. 3.1.2.2.3 Rechargeable battery cell 3 WISMO Q2501 BAS40 1 VCC 2.2 kΩ VCC_RTC Ex: ML621 2.2 µF GND GND Figure 5: RTC supplied by a rechargeable battery cell Estimated range with 2 mAh rechargeable battery: ~15 hours.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.2 Common GSM/GPS part 3.2.1 Module activation function (ON/~OFF) The ON/~OFF input (pin 26) is used to switch ON (ON/~OFF=1) or OFF (ON/~OFF=0) the WISMO Quik Q2501 module. A high level signal has to be provided on the pin ON/~OFF to swith ON the module. The level of the voltage of this signal has to be maintained between 2.4 V and VBATT during a minimum of 500 ms. This signal can be left at high level until switch OFF.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.2.3 Reset function (~RST) The ~RST input (pin 34) is used to force a reset procedure by providing low level during at least 500 µs. This signal has to be considered as an emergency reset only: a reset procedure is automatically driven by an internal hardware during the power-up sequence. This signal can also be used to provide a reset to an external device (it then behaves as an output). If no external reset is necessary this input can be left open.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.2.4 Activity status GPS_TIMEPULSE) indication function (FLASH_LED & The GSM and GPS activity status indication signals (FLASH_LED pin 72 and GPS_TIMEPULSE pin 17) can be used to drive two LEDs through an opencollector digital transistor according to the module activity status.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3 GSM/GPRS Base Band part 3.3.1 GSM serial links The GSM/GPRS Base Band part of the WISMO Quik Q2501 includes two independent V24/CMOS serial link interfaces: UART1 (main serial link) which consists in a flexible 8-wire serial interface complying with V24 standard (TX, RX, CTS, RTS, DSR, DTR, DCD and RI), UART2 (auxiliary serial link) which consists in a flexible 4-wire serial interface complying with V24 standard (TX, RX, CTS and RTS).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Warning: The application board must allow the WISMO serial link signals + the BOOT, the RESET and the ON/OFF module signals to be easily accessed thus allowing the module firmware to be upgraded. V24/CMOS possible design: Host Microprocessor Figure 12: Example of V24/CMOS serial link implementation for UART1 The design given in the Figure above is a basic one.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.1.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.2 General purpose I/O The WISMO Quik Q2501 provides: up to 6 GSM General Purpose I/O, up to 4 GSM General Purpose Output, up to 1 GSM General Purpose Input.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.3 Peripheral buses One peripheral bus is available on the WISMO Quik Q2501 System Connector. It can be used to drive SPI peripherals (3-wire interface) or standard 2-wire peripherals. The choice between these two types of peripherals is exclusive due to signal multiplexing. 3.3.3.1 SPI Bus The SPI bus includes clock (SPI_CLK), I/O (SPI_IO) and enable signals (SPI_EN, SPI_AUX) complying with SPI bus standard. The maximum speed transfer is 3.25 Mb/s.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.3.2 Two-wire bus The 2-wire interface includes clock and data signals complying with a standard 96 kHz interface. Each signal has to be pulled-up to VCC via an external 2.2 kΩ resistor. The maximum speed transfer is 400 kbits/s.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.4 SIM interface 3.3.4.1 SIM 3V management The SIM interface controls a 3 V SIM card only. To support 1.8 V/3 V or 3 V/5 V SIM cards, an external SIM driver (specific level shifter) is required (refer to paragraphs 3.3.4.2 and 3.3.4.3). It is recommended to add Transient Voltage Suppressor diodes (TVS) on the signal connected to the SIM socket in order to prevent any ElectroStatic Discharge.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 SIM socket connection: Pin description Signal Pin number Description VCC 1 SIM_VCC RST 2 SIM_RST CLK 3 SIM_CLK CC4 4 VCC module GND 5 GROUND VPP 6 Not connected I/O 7 SIM_DATA CC8 8 SIM_PRES with 100 kΩ pull down resistor The capacitor placed on the SIM_VCC line must not exceed 470 nF. confidential © Page: 32 / 79 This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.4.2 SIM 1.8 V / 3 V management It is possible to manage 1.8 V and 3 V SIM cards using an external level shifter device (see Figure below). In this case, depending on the type of SIM detected, the module firmware triggers the GPO1 output signal (pin #42) in order to properly set the external SIM driver level (1.8 V or 3 V). As for 3 V SIM, it is recommended to add Transient Voltage Suppressors on the signals connected to the SIM socket (refer to Figure 16).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.4.3 SIM 3 V / 5 V management It is possible to manage 3 V and 5 V SIM cards using an external level shifter device (see Figure below). In this case, depending on the type of SIM detected, the module firmware triggers the GPO1 output signal (pin #42) in order to properly set the external SIM driver level (3 V or 5 V). As for 3 V SIM, it is recommended to add Transient Voltage Suppressors on the signals connected to the SIM socket (refer to Figure 16).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.5 Keyboard interface This interface provides 10 connections: 5 rows (ROW0 to ROW4), 5 columns (COL0 to COL4). The scanning is a digital one, and the debouncing is done in the WISMO module. No discrete components like resistors or capacitors are needed. The keyboard scanner is equipped with internal pull-down resistors for the rows and pull-up resistors for the columns. Current only flows from the column pins to the row pins.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Figure 19: Example of keyboard implementation confidential © Page: 36 / 79 This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement. Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.6 Audio interface 3.3.6.1 General Two different microphone inputs and two different speaker outputs are supported. The WISMO Quik Q2501 also includes echo cancellation and noise reduction features improving quality of hands-free function. In some cases, ESD protection must be added on the audio interface lines. 3.3.6.2 Microphone inputs 3.3.6.2.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.6.2.3 Main Microphone input typical implementation Figure 20: Example of main microphone (MIC2) implementation 3.3.6.2.4 Auxiliary Microphone Inputs (MIC1) MIC1 inputs do not include internal bias, making these inputs the standard ones for an external headset or a hands-free kit, connected either in differential or single-ended mode.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.6.2.5 Differential connection example Impedance of the microphone input in differential mode: • Module ON: Rin = 10 kΩ ± 30 %, • Module OFF: Rin > 10 MΩ ± 30 %. Figure 21: MIC1 input differential connection L300, L301, C304, C305, C306 should be placed as close as possible to the pin #62 (MIC1P) and pin #64 (MIC1N) of the WISMO Q2501 module system connector. It is better using another 2.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.6.2.6 Single ended connection example Figure 22: MIC1 input single ended connection VCC_AUDIO must be very “clean” to avoid bad performance in case of singleended implementation. That is the reason why VCC_AUDIO must be an other 2.8 V to 3 V power supply instead of VCC which is available on system connector (pin #60). R1 is used as a voltage supply filter with C4.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.6.3 Speaker outputs These outputs are differential and the output power can be adjusted by step of 2 dB. Speaker outputs can be directly connected to a speaker. The gain of the speaker outputs is internally adjusted and can be tuned using an AT command (refer to AT commands documentation).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.6.3.3 Single-ended connection Typical implementation: C1 + Speaker Zhp 33 pF to 100 pF C3 SPKxP C2 + R1 SPKxN Figure 24: Speaker single-ended connection 4.7 µF < C1 < 47 µF (depending on speaker characteristics and output power). C1 = C2. R1 = Zhp. Using a single-ended connection includes losing of the output power (- 6 dB) compared to a differential connection.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.7 Buzzer interface The buzzer output (BUZ) is a digital one. A buzzer can be directly connected between this output and VBATT. Pin description Signal Pin # I/O I/O type BUZ 69 O Open collector Description Buzzer output The maximum peak current is 80 mA and the maximum average current is 40 mA. A diode against transient peak voltage must be added as described below.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.8 Digital Power Supply for External Devices (VCC) This output can be used to power some external functions. VCC has to be used as a 2.8 V digital power supply. This power supply is available when the module is on. Pin description Signal Pin # I/O I/O type Description VCC 60 O Supply 2.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.10 GSM Base Band Activation indicator The GSM Base Band activation indicator (GSM_BBEN) is available on system connector. This output signal is driven and supplied by RTC part and can be used as an external information allowing the main power supply (VBATT) to be externally switched OFF. Pin description Signal Pin # I/O I/O type GSM_BBEN 6 O CMOS VCC_RTC / 1X Description Indicator of activation GSM Base Band 3.3.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.3.12 Auxiliary Analog Signals 3.3.12.1 Analog To Digital Converter Input WISMO Quik Q2501 provides an analog to digital converter. It is a 10 bit resolution ADC ranging from 0 V to 2.8 V. AUXADC input can be used, for example, to monitor external temperature, useful for safety power off in case of application over heating.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.4 GPS Base Band part 3.4.1 GPS activation function The GPS function can be activated either by software or by hardware command. Hardware control of the GPS activation function is defined by the software. Pin description Signal Pin # I/O I/O type Description GPS_EN 21 I CMOS External activation of the GPS function.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.4.2 GPS serial links 3.4.2.1 Main GPS Serial Link implementation (GPS_UART2) This 2-wire serial interface is a 3 V interface. In default configuration, communications. this interface allows GPS NMEA frame Pin Description Signal Pin # I/O I/O type Description GPS_RXD2 1 O Open Collector with 10 kΩ internal pull-up GPS_TXD2 2 I CMOS 2.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.4.2.2 Auxiliary GPS Serial Link implementation (GPS_UART0) This 2-wire serial interface is a 1.8 V interface. Default protocol on this serial link is RTCM. However, NMEA protocol can be available on this serial link by software configuration via the GPS Base Band section. Pin Description Signal Pin # I/O I/O type GPS_RXD0 3 O GPS_1X GPS_TXD0 4 I CMOS 1.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.4.3 Dead reckoning interface 3.4.3.1 SPI interface for gyroscope and temperature sensors The WISMO Q2501 module is configured as a SPI master. The SPI interface consists in five signals as described in the table below. Pin Description Signal Pin # I/O I/O type Description GPS_SCK 5 I GPS_MOSI 8 I/O CMOS 1.8V/1X Serial Data (Master Out/Slave In) GPS_MISO 11 I/O CMOS 1.8V/1X Serial Data (Master In/Slave Out) GPS_PCS0_N 13 O CMOS 1.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Note that a 1.8 V/ 5 V voltage level adaptation is implemented between the WISMO Q2501 signals and the sensor devices (A/D converter and temperature sensor). Voltage level adaptation is implemented using open-drain buffers and pull-up resistors connected to the open-drain outputs. The 100 kΩ resistor connected between PCS1_N signal and VDD18_OUT is required to keep PCS1_N high (inactive) during power up when PCS1_N is temporarily in high impedance state.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.4.3.2 Reverse Indicator Input Information not available for preliminary version. 3.4.3.3 Odometer Input Information not available for preliminary version. 3.4.4 1.8 V Digital Power Supply for External Devices Information not available for preliminary version. 3.4.5 GPS External Interruption Information not available for preliminary version. 3.4.6 GPS Antenna Power Supply Information not available for preliminary version.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.5 RF part 3.5.1 Antenna connection possibilities The GSM/GPRS & GPS antennas can be connected to the module in two different ways: Connection Block diagram Description Normal connection Two dedicated antennas are used Single Coax connection One specific antenna is used, connected to the GSM/GPRS connector. The Single Coax feature allows to save a coaxial feeder. Obviously, a specific antenna is used. For more information WAVECOM Support.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 0.5 dB can be considered as a maximum value for loss between the module and an external connector. 3.5.2 GSM/GPRS antenna connection 3.5.2.1 Antenna specifications The GSM/GPRS antenna must fulfil the requirements given in the table hereafter.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.5.2.2 Antenna implementation The antenna should be isolated as much as possible from the analog & digital circuitry (including the interface signals). On applications embedding an internal antenna, a poor shielding could dramatically affect the sensitivity of the terminal. Moreover, the power emitted through the antenna could affect the application (TDMA noise for instance).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 The GPS active antenna must fulfil the following requirements: GPS Characteristic Frequency RX L1 = 1575.42 MHz 50 ohms 1.5 : 1 / RHCP / Impedance VSWR Rx max Polarization Antenna gain (including cable losses) Min. 15 Max. 45 dB 5 (at zenith) dBi 40 min (@ ± 130 MHz of L1) (rejection of GSM & DCS Tx band. dB 3 or 5 V Typical radiated gain Filtering Typ. 25 Supply voltage With GPS antenna external supply Min. Supply current Typ. 30 Max.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 even more compared to the GSM antenna, the GPS deals with very low signals. Consequently, the antenna must be placed far from wide band jammers like micro-controllers, RAM, DC-DC Converter.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 3.5.3.3 Passive Antenna implementation It is not advised to use a passive antenna because: If there is some cable length between the GPS ceramic patch and the Q2501 module, those losses will not be hidden (no LNA), so the GPS signal will be lowered, resulting in poor performances. Even if there is few cable length (< 5 cm), the Noise Factor at the GPS input connector is the 3 dB Range.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 The LNA used (AM50-0002 from MACOM) is traditionally used in many GPS active antennas. This LNA is very simple to use, but the consumption is fairly high (20 mA), that is not well suited for handheld devices. Similar LNA (with lower consumption) from other manufacturers can be used (NEC, Maxim, RFMD…).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 4 PCB Design 4.1 General Rules and Constraints On the application board, it is strongly recommended to avoid routing any signals under the module. Clock and other high frequency digital signals (e.g. serial buses) should be routed as far as possible from the WISMO analog signals. If the application design makes it possible, all analog signals should be separated from digital signals by a Ground line on the PCB. 4.2 Specific Routing Constraints 4.2.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 Filtering capacitors, near the module power supply, could also be added. Attention shall be paid to the ground track or the ground plane on the application board for the power supply which supplies the module. The ground track or the ground plane on the application board must support current peaks as for the VBATT track. If the ground track between the module and the power supply, is a ground plane, it must not be parceled out.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 4.2.2.2 Application Ground Plane and Shielding connection The WISMO Quik Q2501 module shielding case is linked to the ground. The ground has to be connected on the mother board through a complete layer on the PCB.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 4.2.5 RF circuit routing constraints 4.2.5.1 General recommendations If RF signals need to be routed on the application board, the following recommendations must be observed for the PCB layout: The RF signals must be routed using traces with 50 Ω characteristic impedance. Basically, the characteristic impedance depends on: the dielectric, the width of the trace and the height between the ground plane.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 If multi-layer PCB is used, the RF path on the board must not cross any signals (digital, analog or supply). If necessary, use StripLine structure and route the digital line(s) “outside” the RF structure as shown in the figure below: Bad routing Correct Routing The yellow traces cross the RF There is no signal around the RF trace. path. Stripline and Coplanar design require to have a correct ground plane at both sides.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 4.2.5.2 Connection possibilities If the GSM/GPRS or GPS RF connections need to be implemented on the application board (for mechanical purposes for instance), there are two main connection possibilities: Connection using a soldered pigtail connection, Connection using a dedicated cable assembly.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 If soldered pigtail connection is used on recommended to use the following routing: the application board, it is Main conductor • Use 50 Ω traces (StripLine or MicroStrip) Braid: Ground Connection • use thermal breaks in order to ease soldering process • the braid must be soldered over 5 mm long. Please solder it as shown in the picture. • The cable must «go» straight forward, do not stress it (it may break).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 4.3 Pads design Figure 40: Pads design confidential © Page: 67 / 79 This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement. Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 5 Mechanical Specifications The next page shows the mechanical drawing which specifies the area needed for module fitting in an application. That drawing gives, among other things: the drill template for the four pads to be soldered on the application board, the dimensions and tolerance for correctly placing the 80-pin female connector on the application board.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 6 EMC and ESD recommendations The EMC tests have to be performed as soon as possible on the application to detect any possible problem. When designing, special attention should be paid to: Possible spurious emission radiated by the application to the RF receiver in the receiver band ESD protection on SIM (if accessible from outside), serial link, etc. Refer to paragraph 3.3.4 SIM interface.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 7 Firmware upgrade requirements The firmware upgrade process consists in downloading a GSM/GPRS software or a GPS software into the corresponding flash memories internal to the WISMO Q2501 module. For both GSM/GPRS and GPS softwares, the downloading is done through the GSM Main Serial link port (UART1) connected to a PC.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 8 Embedded Testability 8.1 Access to the serial link Direct access to GSM UART1 serial link is very useful for: Testability operations, Firmware download. To allow that access, the following design is recommended: GND C400 100 nF R412 3.3 Ω C402 2.2 µF C401 2.2 µF DVCC_MAX VCC_STK 26 1 C404 2.2 µF 2 28 C403 2.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 When it is necessary to download a firmware into the WISMO module without going through the RS232 interface, access to the module is forced via the debug connector. In such a case, input signals coming from this connector mask the input signals coming from the MAX3237 device.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 8.2 RF output accessibility for diagnostic During the integration phase of the module, it can be helpful to connect the Q2501 module to a GSM/GPRS simulator in order to check some critical RF Tx parameters. Even though the module has been certified, some parameters can be degraded because some basic precautions have not been taken (poor power supply for example).
WM_PRJ_Q2501_PTS_002 - 001 March 2004 9 Manufacturers and suppliers This section contains a list of recommended manufacturers or suppliers for the peripheral devices to be used with the WISMO Quik Q2501 module. 9.1 System connector The system connector is a 80-pin 50 Ω SMT connector with 0.5 mm pitch from MOLEX. For further details about this connector, refer to document [2].
WM_PRJ_Q2501_PTS_002 - 001 March 2004 9.4 Speaker The speaker selected must comply with the GSM recommendations in terms of frequency response. A list of possible suppliers is given hereafter: SANYO (see http://www.sanyo.com/industrial/components/) HOSIDEN (see http://www.hosiden.co.jp/) PRIMO (see http://www.primo.com.sg/) PHILIPS (see http://www.semiconductors.philips.com/) 9.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 9.7 GPS antenna Provider Reference Type Adress u-blox Europe Ltd Mobile Barham Court Teston Maidstone uBlox UK ANN-ST-0-005-0 3V/5V Tel: +44 (0) 1622 618628 Fax: +44 (0) 1622 618629 England Europarc GPS 100 KT + 5V FME-SMA AMC Centurion nigel.carter@u-blox.com> Immeuble FEMTO jm.gourin@micropuissance.
WM_PRJ_Q2501_PTS_002 - 001 March 2004 10 Appendix confidential © Page: 78 / 79 This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement. Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable.
0.50mm (.020") Pitch Board-to-Board Receptacle FEATURES AND SPECIFICATIONS Features and Benefits Stacking Heights: 3.0 and 4.0mm Sizes 20 to 80 circuits Locking feature provides secure mating High temperature housing Durable blade on beam contact interface Anti-flux design Electrical Voltage: 50V Current: 0.5A Contact Resistance: 50mΩ max. Dielectric Withstanding Voltage: 500V AC Insulation Resistance: 100 MΩ min.
