Product Technical Specification & Customer Design Guidelines WISMO228 WIreless Standard MOdem WA_DEV_W228_PTS_002 001 August 26, 2009
Product Technical Specification & Customer Design Guidelines Important Notice Due to the nature of wireless communications, transmission and reception of data can never be guaranteed. Data may be delayed, corrupted (i.e., have errors) or be totally lost.
Product Technical Specification & Customer Design Guidelines Limitations of Liability This manual is provided “as is”. Sierra Wireless makes no warranties of any kind, either expressed or implied, including any implied warranties of merchantability, fitness for a particular purpose, or noninfringement. The recipient of the manual shall endorse all risks arising from its use.
Product Technical Specification & Customer Design Guidelines Contact Information Phone: Sales Desk: 1-604-232-1488 Hours: 8:00 AM to 5:00 PM Pacific Time E-mail: sales@sierrawireless.com Sierra Wireless 13811 Wireless Way Post: Richmond, BC Canada V6V 3A4 Fax: 1-604-231-1109 Web: www.sierrawireless.com Consult our website for up-to-date product descriptions, documentation, application notes, firmware upgrades, troubleshooting tips, and press releases: www.sierrawireless.
Product Technical Specification & Customer Design Guidelines Contents CONTENTS ......................................................................................................................... 5 LIST OF FIGURES .............................................................................................................. 9 LIST OF TABLES .............................................................................................................. 11 1. REFERENCES ....................................
Product Technical Specification & Customer Design Guidelines SPI Bus for Debug Trace ONLY........................................................................................................... 35 Pin Description ................................................................................................................................. 35 SPI Waveforms .................................................................................................................................
Product Technical Specification & Customer Design Guidelines Electrical Characteristics.................................................................................................................. 68 Pin Description ................................................................................................................................. 68 Application .......................................................................................................................................
Product Technical Specification & Customer Design Guidelines Castellation Pins..................................................................................................................................... 93 Pin Configuration ............................................................................................................................. 93 Pin Description .................................................................................................................................
Product Technical Specification & Customer Design Guidelines List of Figures Figure 1. Functional Architecture ............................................................................................................... 21 Figure 2. Power Supply During Burst Emission ...................................................................................... 24 Figure 3. Reject Filter Diagram .................................................................................................................
Product Technical Specification & Customer Design Guidelines Figure 32. Power‐ON Sequence .................................................................................................................... 69 Figure 33. Power‐OFF Sequence ................................................................................................................... 70 Figure 34. RTC Supplied by a Gold Capacitor ...........................................................................................
Product Technical Specification & Customer Design Guidelines List of Tables Table 1. Frequency Range for Tx and Rx .............................................................................................. 21 Table 2. WISMO228 Interfaces................................................................................................................ 23 Table 3. Input Power Supply Voltage ................................................................................................... 25 Table 4.
Product Technical Specification & Customer Design Guidelines Table 31. VCC_2V8 Pin Description ........................................................................................................ 73 Table 32. Electrical Characteristics of the BAT‐RTC Signal ................................................................. 74 Table 33. BAT‐RTC Pin Description ........................................................................................................ 74 Table 34. TX_CTRL Status ......
Product Technical Specification & Customer Design Guidelines 1. References Reference Documents Several documents are referenced throughout this specification. For more details, please consult the listed reference documents. The WAVECOM documents referenced herein are provided in the WAVECOM documentation package; however, the general reference documents which are not WAVECOM owned are not provided in the documentation package.
Product Technical Specification & Customer Design Guidelines Abbreviation Definition CB Cell Broadcast CBS Cell Broadcast Service CE - CEP Circular Error Probable CLK CLocK CMOS Complementary Metal Oxide Semiconductor CODEC COder DECoder CPU Central Processing Unit CS Coding Scheme CSD Circuit Switched Data CTS Clear To Send DAC Digital to Analog Converter DAI Digital Audio Interface dB Decibel DC Direct Current DCD Data Carrier Detect DCE Data Communication Equipment DC
Product Technical Specification & Customer Design Guidelines Abbreviation Definition EMS Enhanced Message Service EN ENable ESD ElectroStatic Discharges ETSI European Telecommunications Standards Institute FIFO First In First Out FR Full Rate FTA Full Type Approval GND GrouND GPI General Purpose Input GPC General Purpose Connector GPIO General Purpose Input Output GPO General Purpose Output GPRS General Packet Radio Service GPS Global Positioning System GPSI General Purpose S
Product Technical Specification & Customer Design Guidelines Abbreviation Definition LSB Less Significant Bit MAX MAXimum MIC MICrophone MIN MINimum MMS Multimedia Message Service MO Mobile Originated MS Mobile Station MT Mobile Terminated na Not Applicable NF Noise Factor NMEA National Marine Electronics Association NOM NOMinal NTC Négative Temperature Coefficient PA Power Amplifier Pa Pascal (for speaker sound pressure measurements) PBCCH Packet Broadcast Control CHannel
Product Technical Specification & Customer Design Guidelines Abbreviation Definition RAM Random Access Memory RF Radio Frequency RFI Radio Frequency Interference RHCP Right Hand Circular Polarization RI Ring Indicator RMS Root Mean Square RST ReSeT RTC Real Time Clock RTCM Radio Technical Commission for Maritime services RTS Request To Send RX Receive SCL Serial CLock SDA Serial DAta SIM Subscriber Identification Module SMD Surface Mounted Device/Design SMS Short Message Se
Product Technical Specification & Customer Design Guidelines Abbreviation Definition TVS Transient Voltage Suppressor TX Transmit TYP TYPical UART Universal Asynchronous Receiver-Transmitter UBX µ-blox proprietary protocol (NE DOIT PAS APPARAITRE) USB Universal Serial Bus USSD Unstructured Supplementary Services Data VSWR Voltage Standing Wave Ratio WAP Wireless Application Protocol WA_DEV_W228_PTS_002 Rev 001 Page 18 of 108
Product Technical Specification & Customer Design Guidelines 2. General Description General Information The WISMO228 is a self‐contained GSM 850/EGSM 900/DCS 1800/PCS 1900 quad‐band module that was specifically designed for M2M systems deployed all over the world. Overall Dimensions • Length: 25.0 mm • Width: 25.0 mm • Thickness: 2.8 mm (excluding label thickness) • Weight: 3.
Product Technical Specification & Customer Design Guidelines Interfaces • VBAT power supply • Digital section running under 2.
Product Technical Specification & Customer Design Guidelines Functional Description The global architecture of the WISMO228 is shown in the figure below. Figure 1. Functional Architecture RF Functionalities The Radio Frequency (RF) range complies with the Phase II GSM 850/EGSM 900/DCS 1800/PCS 1900 recommendation. The frequency range for the transmit band and receive band are listed in the table below. Table 1.
Product Technical Specification & Customer Design Guidelines Transmit Band (Tx) Receive Band (Rx) E-GSM 900 880 to 915 MHz 925 to 960 MHz DCS 1800 1710 to 1785 MHz 1805 to 1880 MHz PCS 1900 1850 to 1910 MHz 1930 to 1990 MHz The RF part of the WISMO228 is based on a specific dual band chip which includes: • a Digital low‐IF receiver • a dual‐band LNA (Low Noise Amplifier) • an Offset PLL (Phase Locked Loop) transmitter • a Frequency synthesizer • a Digitally Controlled Crystal Oscillator
Product Technical Specification & Customer Design Guidelines 3. Interfaces General Interfaces The WISMO228 has a 46‐pin castellation connection, which provides access to all available interfaces. The following table enumerates the available interfaces on the WISMO228.
Product Technical Specification & Customer Design Guidelines Table 2.
Product Technical Specification & Customer Design Guidelines Driven by AT commands Available Interface SPI Bus for Debug Trace ONLY The WISMO228 provides one SPI bus through the castellation pin. Caution: This interface is only used for monitoring trace for debug purposes. Pin Description The following table provides the pin description of the SPI bus. Table 3.
Product Technical Specification & Customer Design Guidelines Available Interface Driven by AT commands SIM Interface Yes Error! Reference source not found. No* Error! Reference source not found. Yes Serial Interface (SPI) No Analog to Digital Converter No* Pulse-Width Modulators (PWMs) Yes ON/~OFF No PWM2 for Buzzer Output Yes Module Ready Indication No VBAT_RTC (Backup Battery) No TX Burst Indication Signal No Error! Reference source not found.
Product Technical Specification & Customer Design Guidelines Power Supply Power Supply Description The power supply is one of the key elements in the design of a GSM terminal. Due to the burst emission in GSM/GPRS, the power supply must be able to deliver high current peaks in a short time. During these peaks, the ripple (Uripple) on the supply voltage must not exceed a certain limit. Refer to Table 4 Input Power Supply Voltage for the input power supply voltage values.
Product Technical Specification & Customer Design Guidelines Electrical Characteristics Table 4. Vmin VBATT2 3.21 Vnom 3.6 Input Power Supply Voltage Vmax 4.8 ITYP TBD Imax TBD Ripple max (Uripp) TBD 1: This value has to be guaranteed during the burst (with TBDA Peak in GSM or GPRS mode) 2: The maximum operating Voltage Stationary Wave Ratio (VSWR) is 1.5:1. Note: When powering the WISMO228 with a battery, the total impedance (battery + protections + PCB) should be less than 150mΩ.
Product Technical Specification & Customer Design Guidelines C1, C2: 10μF +/‐20% Component Manufacturer GRM21BR60J106KE19L MURATA CM21X5R106M06AT KYOCERA JMK212BJ106MG-T TAYO YUDEN C2012X5R0J106MT TDK L1: 220nH +/‐5% Component Manufacturer 0805CS-221XJLC COILCRAFT 0805G221J E STETCO WA_DEV_W228_PTS_002 Rev 001 Page 29 of 108
Product Technical Specification & Customer Design Guidelines Power Consumption The power consumption levels of the WISMO228 vary depending on the operating mode used and the following sub‐sections describe the power consumption values of the WISMO228 when running in various operating modes and RF bands. Various Operating Modes Refer to the following table for the list of available operating modes on the WISMO228. Table 6.
Product Technical Specification & Customer Design Guidelines When the WISMO228 has had no activities for a certain period of time, it will enter sleep mode automatically, regardless of the DTR level. Any ASCII character on the UART can wake the WISMO228 up. Refer to the WISMO218 AT Commands Manual for more information about the AT+PSSLEEP command. Power Consumption Values Three VBATT values were used to measure the power consumption of the WISMO228: VBATTmin (3.2V), VBATTmax (4.
Product Technical Specification & Customer Design Guidelines Table 7. WISMO228 Power Consumption WISMO228 Power Consumption Operating Mode Parameters I MIN average I NOM average I M AX I M AX peak Unit average VBATT=4.8V VBATT=3.6V VBATT=3.2 V Off Mode* TBD TBD TBD TBD µA Alarm Mode TBD TBD TBD TBD µA Paging 2 (Rx burst occurrence ~0.
Product Technical Specification & Customer Design Guidelines Gam.18 (TX power 0dBm) TBD TBD TBD TBD mA Gam.3 (TX power 30dBm) TBD TBD TBD TBD mA Gam.18 (TX power 0dBm) TBD TBD TBD TBD mA Gam.3 (TX power 33dBm) TBD TBD TBD TBD mA Gam.17 (TX power 5dBm) TBD TBD TBD TBD mA Gam.3 (TX power 33dBm) TBD TBD TBD TBD mA Gam.17 (TX power 5dBm) TBD TBD TBD TBD mA Gam.3 (TX power 30dBm) TBD TBD TBD TBD mA Gam.18 (TX power 0dBm) TBD TBD TBD TBD mA Gam.
Product Technical Specification & Customer Design Guidelines Consumption Measurement Procedure for more information regarding consumption measurement procedures. Consumption Waveform Samples The consumption waveforms presented below have a typical VBATT voltage of 3.6V and are for an EGSM900 network configuration. Four significant operating mode consumption waveforms are shown in the following subsections, namely: • Connected Mode (PCL5: Tx power 33dBm) • Transfer mode (GPRS class 10, gam.
Product Technical Specification & Customer Design Guidelines Transfer Mode Class 10 Current Waveform TX PEAK Idle Mode Page 2 Current Waveform RX PEAK WA_DEV_W228_PTS_002 Rev 001 Page 35 of 108
Product Technical Specification & Customer Design Guidelines Idle Mode Page 9 Current Waveform RX PEAK Recommendations for Less Consumption For better power consumption, in particular for the quiescent current, it is recommended to drive the GPIOs as shown in the table below. Table 8.
Product Technical Specification & Customer Design Guidelines Electrical Information for Digital I/O The following table describes the electrical characteristics of the digital I/Os (interfaces such as GPIO, SPI, etc.) available on the WISMO228. Table 9. Electrical Characteristics of Digital I/Os 2.8Volt Type (2V8) Parameter Conditions Internal 2.8V power supply Input/Output Pin I/O Type Minimum Typical Maximum VCC_2V8 2.7V 2.8V 2.95V VIL CMOS -0.4V* - 0.4V VIH CMOS 2.
Product Technical Specification & Customer Design Guidelines SPI Bus for Debug Trace ONLY The WISMO228 provides one SPI bus through the castellation pin. Caution: This interface is only used for monitoring trace for debug purposes. Pin Description The following table provides the pin description of the SPI bus. Table 10.
Product Technical Specification & Customer Design Guidelines Figure 8. Example of an SPI to UART2 Interface Conversion Implementation The following table lists the recommended components to use in implementing the SPI to UART2 interface.
Product Technical Specification & Customer Design Guidelines Figure 9. Example of an RS-232 Level Shifter Implementation for UART2 The following table lists the recommended components to use in implementing a UART transceiver circuitry.
Product Technical Specification & Customer Design Guidelines Main Serial Link (UART) A flexible 8‐wire serial interface is available on the WISMO228 that complies with the V24 protocol signaling, but not with the V28 (electrical interface) protocol, due to its 2.8V interface.
Product Technical Specification & Customer Design Guidelines use ~CT105/RTS and ~CT106/CTS for hardware flow control in order to avoid data corruption during transmissions. 5-wire Serial Interface Hardware Design The signals used in this interface hardware design are as follows: • CT103/TXD • CT104/RXD • ~CT105/RTS • ~CT106/CTS • ‐CT108/DTR The signal ~CT108/DTR must be managed following the V24 protocol signaling if idle mode is to be used.
Product Technical Specification & Customer Design Guidelines • CT104/RXD Signals ~CT105/RTS and ~CT106/CTS are not used in this configuration. Configure the AT command AT+IFC=0,0 to disable the flow control function on the WISMO228. Refer to the WISMO218 AT Commands Manual for more information about configuring AT commands. Also, • The signal ~CT108/DTR can be looped back to ~CT107/DSR from both the WISMO228 side and from the DTE side.
Product Technical Specification & Customer Design Guidelines Power Consumption. In order to go to sleep mode properly under this instead.
Product Technical Specification & Customer Design Guidelines Note: Power Consumption. Application The level shifter must be a V28 electrical signal compliant with 2.8V. Figure 10. Example of RS-232 Level Shifter Implementation for UART Note: The U1 chip also protects the WISMO228 against ESD (air discharge) at 15KV. The following table lists the recommended components to use in implementing a level shifter UART.
Product Technical Specification & Customer Design Guidelines It is not necessary to use level shifters when the UART interface is directly connected to a host processor. Refer to the following sections for steps on how to connect the interface using other design implementations. V24/CMOS Possible Design Figure 11. Example of V24/CMOS Serial Link Implementation for a 2-wire UART Figure 12.
Product Technical Specification & Customer Design Guidelines Figure 13. Example of V24/CMOS Serial Link Implementation for a 5-wire UART The designs shown in Figure 11, Figure 12 and Figure 13 are basic designs. Both the DCD and the RI can be left open when not used. However, a more flexible design to access this serial link with all modem signals is shown below. Figure 14.
Product Technical Specification & Customer Design Guidelines SIM Interface The Subscriber Identification Module can be directly connected to the WISMO228 through this dedicated interface. This interface controls both 1.8V and 3V SIM cards and is fully compliant with GSM 11.11 recommendations concerning SIM functions.
Product Technical Specification & Customer Design Guidelines Parameters Conditions Minimum Typical Maximum Unit SIM-VCC = 1.8V 1.65 1.8 1.95 V full-power mode - - 20 mA Sleep mode with 32kHz system clock enabled. - - 3 mA SIM-CLK Rise/Fall Time Loaded with 30pF and ESD protection diode - 25 50 ns ~SIM-RST, Rise/Fall Time Loaded with 30pF and ESD protection diode - 45 - ns SIM-IO Rise/Fall Time Loaded with 30pF and ESD protection diode - 0.
Product Technical Specification & Customer Design Guidelines Application Figure 15. Example of a SIM Socket Implementation The following table lists the recommended components to use in implementing the SIM socket. Component Description/Details Manufacturer C400 100nF D400 ESDA6V1SC6 ST D401 DALC208SC6 SGS-THOMSON ITT CANNON CCM03 series (Refer to the SIM Card Reader sub-section of section 1 Error! Not a valid result for table.
Product Technical Specification & Customer Design Guidelines Pin # Signal Description 3 CLK SIM-CLK 4 CC4 Not connected 5 GND GROUND 6 VPP Not connected 7 I/O SIM-IO 8 CC8 Not connected Note: CC4 and CC8 are not connected as the WISMO228 does not support the SIM detect feature.
Product Technical Specification & Customer Design Guidelines General Purpose Input/Output The WISMO228 provides up to three General Purpose I/Os. They are used to control any external device such as an LCD or a Keyboard backlight. These GPIOs offer the possibility to read the pin state whatever their direction may be. Pin Description The following table provides the pin description of the GPIOs. Table 15.
Product Technical Specification & Customer Design Guidelines Analog to Digital Converter One Analog to Digital Converter input, AUX‐ADC0, is provided by the WISMO228 for customer applications. It is a 10‐bit resolution converter, ranging from either 0 to 1V or 0 to 3V, depending on the general purpose input mode. Electrical Characteristics The following table describes the electrical characteristics of the ADC interface. Table 16.
Product Technical Specification & Customer Design Guidelines Analog Audio Interface The WISMO228 supports one microphone input and one speaker output. It also includes an echo cancellation feature which allows hands free function. In some cases, ESD protection must be added on the audio interface lines. Microphone Features The microphone, MIC, can have either a single‐ended or a differential connection.
Product Technical Specification & Customer Design Guidelines Electrical Characteristics The following table describes the electrical characteristics of the audio interface, MIC. Table 18. Electrical Characteristics of MIC Parameters Typical Maximum Unit MICP - 2.4 - V MICN without 2.2KΩ to GND - 2.4 - V MICN with 2.2KΩ to GND - 1.2 - V Internal biasing DC Characteristics Minimum Output current R2 mA - 2.2 - KΩ Z2 MICP (MICN=Open) 2.2 Z2 MICN (MICP=Open) Z2 MICP (MICN=GND) 2.
Product Technical Specification & Customer Design Guidelines Speaker Features The speaker, SPK, can either have a single‐ended or a differential connection. However, it is strongly recommended to use a differential connection instead of a single‐ended connection in order to reject common mode noise and TDMA noise. Moreover, in a single‐ended connection, half (½) of the power is lost. Figure 18. Equivalent Circuit of SPK Table 19.
Product Technical Specification & Customer Design Guidelines Parameters voltage Minimum Typical Maximum Unit RL=8Ω: AT+VGR=6*; differential - - 2 Vpp RL=16Ω or 32Ω: AT+VGR=6*; single ended - - 1.1 Vpp RL=16Ω or 32Ω: AT+VGR=6*; differential - - 2.2 Vpp RL Load resistance 6 8 - Ω IOUT Output current; peak value; RL=8Ω - - 90 mA POUT RL=8Ω; AT+VGR=10*; - - 65 mW * The output voltage depends on the output speaker gain set by the AT command.
Product Technical Specification & Customer Design Guidelines Figure 19. Example of a Differential MIC Connection with an LC Filter Audio quality can be very good without L1, L2, C2, C3 and C4 depending on the design. But if there is EMI perturbation, this filter can reduce the TDMA noise. This filter (L1, L2, C2, C3 and C4) is not mandatory, and if not used, the capacitor must be removed and the coil replaced by a 0Ω resistor as shown in the following schematic. Figure 20.
Product Technical Specification & Customer Design Guidelines Component Description/Details Notes C1 12pF to 33pF needs to be tuned depending on the design C2, C3, C4 47pF needs to be tuned depending on the design L1, L2 100nH needs to be tuned depending on the design Single-Ended Connection When single‐ended connection is used for MIC, MICN is just left open. Figure 21. Example of a Single-Ended MIC Connection with an LC filter Note: Z2 is from 200Hz to 4kHz.
Product Technical Specification & Customer Design Guidelines Figure 22. Example of a Single-Ended MIC Connection without an LC Filter Note: *Z2 is from 200Hz to 4kHz. For more details, refer to Table 18 Electrical Characteristics of MIC. The capacitor C1 is highly recommended to eliminate TDMA noise and must be close to the microphone. The following table lists the recommended components to use in implementing a single‐ended MIC connection without an LC filter.
Product Technical Specification & Customer Design Guidelines SPKP SPKN Figure 23. Example of a Differential Speaker Connection Single-Ended Connection In a single‐ended connection, SPKN can be left open. Refer to the following diagram for a typical single‐ended implementation. Figure 24. Example of a Single-Ended Speaker Connection Note: 4.7µF < C1 < 47 µF (Depending on speaker characteristics and output power.
Product Technical Specification & Customer Design Guidelines Recommended Microphone Characteristics • The impedance of the microphone has to be around 2KΩ • Sensitivity is from ‐40dB to ‐50dB • SNR > 50dB • Frequency response is compatible with GSM specifications To suppress TDMA noise, it is highly recommended to use microphones with two internal decoupling capacitors: • CM1=56pF (0402 package) for the TDMA noise coming from the demodulation of the GSM850/EGSM900 frequency signals • CM2=15pF (0
Product Technical Specification & Customer Design Guidelines The types of filtering components are: • RF decoupling inductors • RF decoupling capacitors A good “Chip S‐Parameter” simulator is available from Murata. Refer to http://www.murata.com/products/design_support/mcsil/index.html for more details. Using different Murata components, it can be seen that different packages (with different values and ratings) can have different coupling effects.
Product Technical Specification & Customer Design Guidelines Figure 26. Audio Track Design For differential connections, it is necessary to add a 2.2KΩ resistor from MICN to GND to have a proper bias of the microphone. Differential Audio line is always in parallel Figure 27. Differential Audio Connection For single‐ended connections, the negative pole of the microphone, MICN, should be connected to GND.
Product Technical Specification & Customer Design Guidelines Figure 28. Single-Ended Audio Connection Caution: It is a must to avoid digital tracks crossing under and over the audio tracks. Even when MICP is singled-ended, it is highly recommended to have the MIC ground and the LC filter ground to act as an audio analog ground during the PCB layout. This audio ground, together with the MICP signal, should act as the differential line pair.
Product Technical Specification & Customer Design Guidelines Pulse-Width Modulators (PWMs) The WISMO228 contains two Pulse‐Width Modulators (PWMs) that can be used in conjunction with an external transistor for driving a vibrator, or a backlight LED. Each PWM uses two 7‐bit unsigned binary numbers: one for the output period and one for the pulse width or the duty cycle. The relative timing for the PWM output is shown in the figure below. Figure 29.
Product Technical Specification & Customer Design Guidelines Pin # 36 Signal PWM0 I/O O I/O Type 2V8 Description PWM output Application Both the PWM0 and PWM1 signals can be used in conjunction with an external transistor for driving a vibrator, or a backlight LED. Figure 30. Example of an LED Driven by the PWM0 or PWM1 Output The value of R607can be harmonized depending on the LED (D605) characteristics. The recommended digital transistor to use for T601 is the DTC144EE from ROHM.
Product Technical Specification & Customer Design Guidelines BUZZER Output The BUZZER signal can be used in conjunction with an external transistor/MOSFET for driving a buzzer in order to give a maximum current of 100mA (PEAK) and an average of 40mA, depending on application requirement. It outputs a square wave at the desired tone frequency. The tone frequencies are programmable and can be re‐programmed on‐the‐fly to generate monophonic audio ringtones or alert tones.
Product Technical Specification & Customer Design Guidelines Pin Description The following table provides the pin description of the BUZZER signal. Table 25. BUZZER Pin Description Pin # 34 Signal BUZZER I/O I/O Type O 2.8V Description Buzzer output Application The maximum peak current of the transistor/MOSFET is 100mA and the maximum average current is 40mA, while the peak current of the BUZZER pin should be less than 4mA. A transient voltage suppressor diode must be added as shown below.
Product Technical Specification & Customer Design Guidelines • T1 = FDN335N (for example) • R2 = 0Ω • R3 = 1MΩ Note: A low filter is recommended at low frequencies.
Product Technical Specification & Customer Design Guidelines Figure 33. Example of an LED Driven by the BUZZER Output The value of R607 can be harmonized depending on the LED (D605) characteristics. The recommended digital transistor to use for T601 is the DTC144EE from ROHM.
Product Technical Specification & Customer Design Guidelines ON/~OFF Signal The ON/~OFF pin is used to switch ON or switch OFF the WISMO228. It is internally connected to the permanent 3.0V supply regulator inside the WISMO228 via a pull‐up resistor. Once there is VBATT supply to the WISMO228, this 3.0V supply regulator will be enabled and so the ON/~OFF signal is by default at HIGH level. A LOW level signal has to be provided on the ON/~OFF pin to switch the WISMO228 ON.
Product Technical Specification & Customer Design Guidelines Application Figure 34. Example of the ON/~OFF Pin Connection Power ON Figure 35. Power-ON Sequence Table 28. Power-ON Sequence Minimum (s) Tready 4 Typical (s) 5 Maximum (s) 7 The ON/~OFF signal level is detected about 250ms after VBATT is available. Note: This timing might be temperature dependant.
Product Technical Specification & Customer Design Guidelines The voltage of this signal has to be pulled LOW for at least 685ms for powering ON. Within this 685ms, the WISMO_READY signal will initially set to HIGH for about 135ms and then resume to LOW. During the power ON sequence, an internal reset is automatically performed for 38ms (typically). During this phase, any external reset should be avoided.
Product Technical Specification & Customer Design Guidelines Software Power OFF The AT command AT+CPOF is used to power OFF the WISMO228. Note: If the ON/~OFF pin is maintained at LOW level when AT+CPOF is used, the module cannot be switched OFF. Hardware Power OFF A LOW level pulse is applied on the ON/~OFF pin for TBC seconds. AT+CPOF will then be automatically sent to the WISMO228. Once the WISMO228 receives the AT+CPOF command, the WISMO228 will be unregistered from the network.
Product Technical Specification & Customer Design Guidelines WISMO_READY Indication This signal indicates the status of the WISMO228 after being powered ON. Note that there is an initial positive pulse of less than 200ms during power ON. Refer to Figure 35: Power‐ON Sequence for more information regarding the power ON sequence. Once the WISMO228 is properly powered ON, the WISMO_READY signal will set to HIGH to acknowledge the successful powering ON of the WISMO228 before it is ready to operate.
Product Technical Specification & Customer Design Guidelines VCC_2V8 Output The VCC_2V8 output voltage supply is available when the WISMO228 is switched ON and can only be used for pull‐up resistor(s) and as a reference supply. Electrical Characteristics The following table describes the electrical characteristics of the VCC_2V8 signal. Table 31. Electrical Characteristics of the VCC_2V8 Signal Parameters Minimum Output voltage VCC_2V8 Typical Maximum Unit 2.70 2.80 2.
Product Technical Specification & Customer Design Guidelines BAT-RTC (Backup Battery) The BAT‐RTC (backup battery) pin is used as a back‐up power supply for the internal Real Time Clock (RTC). VBATT provides the power supply to the RTC when VBATT is switched on but a back‐up power supply is needed to save the date and hour when it is switched off. If VBATT is available, the back‐up battery can be charged by the internal 3.0V power supply regulator via a 2KΩ resistor implemented inside the WISMO228.
Product Technical Specification & Customer Design Guidelines • A non rechargeable battery • A rechargeable battery cell Super Capacitor Figure 37. RTC Supplied by a Gold Capacitor Estimated supply time with a 0.47F gold capacitor: 25 minutes (minimum). Note: The maximum voltage of the gold capacitor is 3.9V. Non-Rechargeable Battery Figure 38. RTC Supplied by a Non Rechargeable Battery The diode, D1, is mandatory to prevent the non rechargeable battery from being damaged.
Product Technical Specification & Customer Design Guidelines Rechargeable Battery Cell Figure 39. RTC Supplied by a Rechargeable Battery Cell Estimated supply time with a fully charged 3.4mAh rechargeable battery: 7 days (minimum). Caution: Before battery cell assembly, ensure that the cell voltage is lower than 3.0V to avoid damaging the WISMO228.
Product Technical Specification & Customer Design Guidelines TX_CTRL Signal for TX Burst Indication The TX_CTRL signal is a 2.8V indication signal for TX Burst with a 100KΩ pull‐up resistor implemented inside the WISMO228 module. Table 35. TX_CTRL Status WISMO228 State TX_CTRL Status During TX burst Low No TX High During TX burst, there will be higher current drain from the VBATT power supply which causes a voltage drop.
Product Technical Specification & Customer Design Guidelines Parameters Conditions Minimum @1A Tdelay Typical Maximum Unit - 27 - µs - 11 - µs Pin Description The following table provides the pin description of the TX_CTRL signal. Table 37. TX_CTRL Signal Pin Description Pin # 18 Signal TX_CTRL I/O O I/O Type Reset State 2V8 1 Description TX Burst indication Application The TX burst indication signal, TX_CTRL, can be used to drive an LED through a transistor.
Product Technical Specification & Customer Design Guidelines Reset The ~RESET pin is a hardware reset and should only be used for emergency resets. It has a 100KΩ internal pull up resistor to VCC_2V8. To activate the «emergency» reset sequence, the ~RESET signal has to be set to LOW level manually. This can be done by using a push button, for example. Figure 42. Reset Timing Electrical Characteristics The following table describes the electrical characteristics of the ~RESET signal. Table 38.
Product Technical Specification & Customer Design Guidelines Pin Description The following table provides the pin description of the RESET signal. Table 39. Reset Pin Description Pin # 12 Signal I/O 100K Pull-up ~RESET I/O Type 2V8 Description WISMO228 Reset Application If the «emergency» reset is used, it has to be driven by either a push button or an open collector/drain transistor as shown in the figures below. Push button 1 2 ~RESET 3 GND Figure 43.
Product Technical Specification & Customer Design Guidelines Table 40. Reset Commands Reset Command ~RESET Operating Mode 1 0 Reset activated 0 1 Reset inactive Note: It is recommended to add a varistor (such as the AVL5M02200 from AMOTECH) on the ~RESET pin in order to enhance ESD immunity.
Product Technical Specification & Customer Design Guidelines RF Interface The RF interface allows the transmission of radio frequency (RF) signals from the WISMO228 to an external antenna. This interface has a nominal impedance of 50Ω and a DC resistance of 0Ω. RF Connection The RF input/output of the WISMO228 is through one of the castellation pins (Pin 21, ANT), with grounded castellation pins at both sides.
Product Technical Specification & Customer Design Guidelines 0.5dB can be considered as the maximum value for loss between the WISMO228 and an external connector. RF Performances RF performances are compliant with ETSI recommendation GSM 05.05. Listed below are the main parameters for both the Receiver and the Transmitter. The main parameters for the Receiver are: • GSM850/EGSM900 Reference Sensitivity = ‐108 dBm (typ.) • DCS1800/PCS1900 Reference Sensitivity = ‐108 dBm (typ.
Product Technical Specification & Customer Design Guidelines Characteristic Typical radiated gain WISMO228 0dBi in one direction at least Caution: Both mechanical and electrical antenna adaptations are key issues in the design of a GSM terminal. It is strongly recommended to work with an antenna manufacturer to either develop an antenna adapted to the application or to adapt an existing solution to the application.
Product Technical Specification & Customer Design Guidelines 5. Consumption Measurement Procedure This chapter describes the consumption measurement procedure used to obtain the WISMO228 consumption specification. The WISMO228 consumption specification values are measured for all operating modes available on the product.
Product Technical Specification & Customer Design Guidelines Figure 46. Typical Hardware Configuration The communication tester is a CMU200 from Rhode & Schwartz. This tester offers all GSM/GPRS network configurations required and allows a wide range of network configurations to be set. The AX502 standalone power supply is used to supply all motherboard components except the WISMO228.
Product Technical Specification & Customer Design Guidelines Table 42.
Product Technical Specification & Customer Design Guidelines The goal of the settings listed above is to eliminate all bias current from VBATT and to supply the entire board (except theWISMO228) using only VBAT. Socket-Up Board An adaptor board, the WISMO218 Socket‐Up Board (WM0801706‐020‐20), is used to connect the WISMO228 to work on the WISMO218 Development Kit. On this socket‐up board, the soldering points of J203, J204, JP101, JP102, JP103, JP104, JP105, JP106 and JP107 must be opened.
Product Technical Specification & Customer Design Guidelines Equipment Configuration The communication tester is set according to the WISMO228 operating mode. Paging during idle modes, TX burst power, RF band and GSM/DCS/GPRS may be selected on the communication tester. Refer to the following table for the network analyzer configuration according to operating mode. Table 43.
Product Technical Specification & Customer Design Guidelines Operating Mode Communication Tester Configuration (3Rx/2Tx) Gam.17 (TX power 5dBm) Gam.3 (TX power 33dBm) 900 MHz Gam.17 (TX power 5dBm) Gam.3 (TX power 30dBm) 1800MHz Gam.18 (TX power 0dBm) Gam.3 (TX power 30dBm) 1900 MHz Gam.18 (TX power 0dBm) Template This template may be used for consumption measurement for all modes and configurations available. Note that three VBATT voltages are used to measure consumption, namely: VBATTmin (3.
Product Technical Specification & Customer Design Guidelines PCL19 (TX power 5dBm) mA PCL0 (TX power 30dBm) mA PCL15 (TX power 0dBm) mA PCL0 (TX power 30dBm) mA PCL15 (TX power 0dBm) mA Gam.3 (TX power 33dBm) mA Gam.17 (TX power 5dBm) mA Gam.3 (TX power 33dBm) mA Gam.17 (TX power 5dBm) mA Gam.3 (TX power 30dBm) mA Gam.18 (TX power 0dBm) mA Gam.3 (TX power 30dBm) mA Gam.18 (TX power 0dBm) mA Gam.3 (TX power 33dBm) mA Gam.17 (TX power 5dBm) mA Gam.3 (TX power 33dBm) mA Gam.
Product Technical Specification & Customer Design Guidelines Gam.3 (TX power 30dBm) mA Gam.18 (TX power 0dBm) mA 1900 MHz * Current consumption in OFF mode is measured with BAT-RTC being left open.
Product Technical Specification & Customer Design Guidelines 6. Technical Specifications Castellation Pins Pin Configuration Figure 47.
Product Technical Specification & Customer Design Guidelines Pin Description Table 45. WISMO228 Castellation Pin Description Pin # Signal Description I/O Pin # Signal Description I/O 1 SPKP Speaker output positive 32 ohms Analog 24 GPIO1 2.8V GPIO I/O 2 SPKN Speaker output negative 32 ohms Analog 25 SPI-IRQ 2.
Product Technical Specification & Customer Design Guidelines Pin # Signal Description I/O Pin # Signal Description I/O 19 GPIO5 2.8V GPIO I/O 42 ~CT107/ DSR 2.8V UART1: Data set ready O 20 GND Ground Ground 43 ~CT109/ DCD 2.8V UART1: Data carrier detect O 21 ANT Radio antenna connection I/O 44 ~CT108/ DTR 2.8V UART1: Data terminal ready I 22 GND Ground Ground 45 ~CT125/ RI 2.8V UART1: Ring indicator O 23 GND Ground Ground 46 VCC_2V 8 2.
Product Technical Specification & Customer Design Guidelines Pin # Signal Recommended Connection When Not Used Pin # Signal Recommended Connection When Not Used 12 ~RESET Open 35 PWM1 Open 13 SPI-IO PCB test point 36 PWM0 Open 14 SPI-O PCB test point 37 On/~OFF Power On control signal 15 SPI-CLK PCB test point 38 CT103/TXD* 2.8V UART1: Transmit data 16 GPIO3 Open 39 ~CT105/RTS* Connect to ~CT106/CTS 17 ~SPI-CS PCB test point 40 CT104/RXD* 2.
Product Technical Specification & Customer Design Guidelines Pin # Signal I/O I/O Type Reset State Description 14 SPI-O O 2V8 Pull down SPI Serial input 15 SPI-CLK O 2V8 Pull down SPI Serial Clock 17 ~SPI-CS O 2V8 Pull up SPI Enable 25 SPI-IRQ I 2V8 Pull down SPI Interrupt An SPI‐to‐UART2 conversion circuit is required to convert the SPI trace to UART2. Also, the SPI‐ IRQ (pin 25) is required for interrupt.
Product Technical Specification & Customer Design Guidelines Figure 49. Example of an SPI to UART2 Interface Conversion Implementation The following table lists the recommended components to use in implementing the SPI to UART2 interface.
Product Technical Specification & Customer Design Guidelines Figure 50. Example of an RS-232 Level Shifter Implementation for UART2 The following table lists the recommended components to use in implementing a UART transceiver circuitry.
Product Technical Specification & Customer Design Guidelines PCB Specifications for the Application Board In order to save costs for simple applications, a cheap PCB structure can be used for the application board of the WISMO228. A 4‐layer through‐hole type PCB structure can be used. Figure 51. PCB Structure Example for the Application Board Note: Due to the limited layers of 4-layer PCBs, sensitive signals like audio, SIM and clocks cannot be protected by 2 adjacent ground layers.
Product Technical Specification & Customer Design Guidelines Class B The WISMO228 remains fully functional across the specified temperature range. Some GSM parameters may occasionally deviate from the ETSI specified requirements and this deviation does not affect the ability of the WISMO228 to connect to the cellular network and be fully functional, as it does within the Class A range.
Product Technical Specification & Customer Design Guidelines Mechanical Specifications Physical Characteristics The WISMO228 has a nearly‐complete self‐contained shield. • Overall dimensions: 25.0 x 25.0 x 2.8 mm (excluding label thickness) • Weight: 3.64g Recommended PCB Landing Pattern Refer to the Customer Process Guideline for WISMO Series document. WISMO228 Dimensions Figure 52.
Product Technical Specification & Customer Design Guidelines 7. Recommended Peripheral Devices General Purpose Connector The general purpose connector is a 46‐pin castellation connector with a 1.5mm pitch. SIM Card Reader Listed below are the recommended SIM Card Readers to use with the WISMO228. • ITT CANNON CCM03 series (see http://www.ittcannon.com ) • AMPHENOL C707 series (see http://www.amphenol.com ) • JAE (see http://www.jae.co.jp/e‐top/index.
Product Technical Specification & Customer Design Guidelines Antenna Cable Listed below are the recommended antenna cables to mount on the WISMO228. • RG178 • RG316 GSM Antenna GSM antennas and support for antenna adaptation can be obtained from manufacturers such as: • ALLGON (http://www.allgon.com ) • HIRSCHMANN (http://www.hirschmann.
Product Technical Specification & Customer Design Guidelines 8. Noises and Design EMC Recommendations EMC tests have to be performed as soon as possible on the application to detect any possible problems. When designing a GSM terminal, make sure to take note of the following items: • Possible spurious emissions radiated by the application to the RF receiver in the receiver band. • ESD protection is mandatory for all peripherals accessible from outside (SIM, serial link, audio, AUX_ADC0, etc.).
Product Technical Specification & Customer Design Guidelines 9. Appendix Standards and Recommendations GSM ETSI, 3GPP, and GCF recommendations for Phase II Specification Reference 3GPP TS 45.005 v5.5.0 (2002-08) Release 5 GSM 02.07 V8.0.0 (1999-07) Title Technical Specification Group GSM/EDGE. Radio Access Network; Radio transmission and reception Digital cellular telecommunications system (Phase 2+); Mobile Stations (MS) features (GSM 02.07 version 8.0.
Product Technical Specification & Customer Design Guidelines Specification Reference Title Technical Specification Group Core Network; 3GPP TS 04.08 V7.18.0 (2002-09) Digital cellular telecommunications system (Phase 2+); Mobile radio interface layer 3 specification (Release 1998) 3GPP TS 04.10 V7.1.0 (2001-12) Technical Specification Group Core Networks; Mobile radio interface layer 3 Supplementary services specification; General aspects (Release 1998) 3GPP TS 04.11 V7.1.
Product Technical Specification & Customer Design Guidelines Specification Reference Title Digital cellular telecommunications system (Phase 2+); General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (GSM 09.07 version 8.0.0 Release 1999) GSM 09.07 V8.0.0 (1999-08) 3GPP TS 51.010-1 v5.0.
Product Technical Specification & Customer Design Guidelines Safety Recommendations (for Information Only) Warning: For the efficient and safe operation of your GSM application based on the WISMO228, please read the following information carefully. RF Safety General Your GSM terminal is based on the GSM standard for cellular technology. The GSM standard is spread all over the world. It covers Europe, Asia and some parts of America and Africa. This is the most used telecommunication standard.
Product Technical Specification & Customer Design Guidelines Do not use the GSM terminal with a damaged antenna. If a damaged antenna comes into contact with the skin, a minor burn may result. Replace a damaged antenna immediately. Consult your manual to see if you may change the antenna yourself. If so, use only a manufacturer‐approved antenna. Otherwise, have your antenna repaired by a qualified technician. Use only the supplied or approved antenna.
Product Technical Specification & Customer Design Guidelines To prevent possible interference with aircraft systems, Federal Aviation Administration (FAA) regulations require you to have permission from a crew member to use your terminal while the aircraft is on the ground. To prevent interference with cellular systems, local RF regulations prohibit using your modem while airborne. Children Do not allow children to play with your GSM terminal. It is not a toy.
