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WA_DEV_W228_PTS_002 Rev 

001 

Page 54 of 108 

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.

 

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.

   

When

 

using

 

a

 

single

‐

ended

 

connection,

 

be

 

sure

 

to

 

have

 

a

 

very

 

good

 

ground

 

plane,

 

very

 

good

 

filtering

 

as

 

well

 

as

 

shielding

 

in

 

order

 

to

 

avoid

 

any

 

disturbance

 

on

 

the

 

audio

 

path.

 

The

 

gain

 

of

 

MIC

 

inputs

 

is

 

internally

 

adjusted

 

and

 

can

 

be

 

tuned

 

using

 

AT

 

commands.

 

The

 

MIC

 

interface

 

already

 

includes

 

suitable

 

biasing

 

for

 

an

 

electret

 

microphone.

 

The

 

electret

 

microphone

 

can

 

be

 

connected

 

directly

 

on

 

the

 

inputs

 

for

 

easy

 

connection.

 

AC

 

coupling

 

is

 

also

 

already

 

embedded

 

in

 

the

 

WISMO228.

 

 

 

Figure 16. DC Equivalent Circuit of MIC 

 

Figure 17. AC Equivalent Circuit of MIC 

 

 

 

Содержание WISMO228

Страница 1: ...WA_DEV_W228_PTS_002 001 August 26 2009 WISMO228 WIreless Standard MOdem Product Technical Specification Customer Design Guidelines ...

Страница 2: ...s Do not operate the Sierra Wireless modem in areas where blasting is in progress where explosive atmospheres may be present near medical equipment near life support equipment or any equipment which may be susceptible to any form of radio interference In such areas the Sierra Wireless modem MUST BE POWERED OFF The Sierra Wireless modem can transmit signals that could interfere with this equipment ...

Страница 3: ...BILITY OF SUCH DAMAGES OR THEY ARE FORESEEABLE OR FOR CLAIMS BY ANY THIRD PARTY Notwithstanding the foregoing in no event shall Sierra Wireless and or its affiliates aggregate liability arising under or in connection with the Sierra Wireless product regardless of the number of events occurrences or claims giving rise to liability be in excess of the price paid by the purchaser for the Sierra Wirel...

Страница 4: ...ail sales sierrawireless com Post Sierra Wireless 13811 Wireless Way 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 com Document Update History Rev Date History of the evolution 001 August 26 2009 Creation ...

Страница 5: ...res 19 Interfaces 20 Firmware 20 Connection Interfaces 20 Functional Description 21 RF Functionalities 21 Baseband Functionalities 22 3 INTERFACES 23 General Interfaces 23 Power Supply 24 Power Supply Description 24 Electrical Characteristics 25 Pin Description 25 Application 25 Power Consumption 27 Various Operating Modes 27 Power Consumption Values 28 Consumption Waveform Samples 30 Connected Mo...

Страница 6: ...ion 48 Analog to Digital Converter 49 Electrical Characteristics 49 Pin Description 49 Analog Audio Interface 50 Microphone Features 50 Electrical Characteristics 51 Speaker Features 52 Electrical Characteristics 52 Pin Description 53 Application 53 Microphone 53 Speaker SPKP ad SPKN 56 Design Recommendations 57 General 57 Recommended Microphone Characteristics 58 Recommended Speaker Characteristi...

Страница 7: ...tion 74 Application 74 Super Capacitor 75 Non Rechargeable Battery 75 Rechargeable Battery Cell 76 TX_CTRL Signal for TX Burst Indication 77 Electrical Characteristics 77 Pin Description 78 Application 78 Reset 79 Electrical Characteristics 79 Pin Description 80 Application 80 RF Interface 82 RF Connection 82 RF Performances 83 Antenna Specifications 83 4 CONSUMPTION MEASUREMENT PROCEDURE 85 Hardw...

Страница 8: ...ication 97 Class A 97 Class B 97 Mechanical Specifications 99 Physical Characteristics 99 Recommended PCB Landing Pattern 99 WISMO228 Dimensions 99 6 RECOMMENDED PERIPHERAL DEVICES 100 General Purpose Connector 100 SIM Card Reader 100 Microphone 100 Speaker 100 Antenna Cable 101 GSM Antenna 101 7 NOISES AND DESIGN 102 EMC Recommendations 102 Power Supply 102 Overvoltage 102 8 APPENDIX 103 Standard...

Страница 9: ...cket Implementation 46 Figure 13 DC Equivalent Circuit of MIC 50 Figure 14 AC Equivalent Circuit of MIC 50 Figure 15 Equivalent Circuit of SPK 52 Figure 16 Example of a Differential MIC Connection with an LC Filter 54 Figure 17 Example of a Differential MIC Connection without an LC Filter 54 Figure 18 Example of a Single Ended MIC Connection with an LC filter 55 Figure 19 Example of a Single Ended...

Страница 10: ...e Battery Cell 76 Figure 37 TX_CTRL State During TX Burst 77 Figure 38 Example of a TX Status Implementation 78 Figure 39 Reset Timing 79 Figure 40 Example of RESET Pin Connection with a Push Button Configuration 80 Figure 41 Example of RESET Pin Connection with a Transistor Configuration 80 Figure 42 Example of a 50Ω RF Line 82 Figure 43 Typical Hardware Configuration 86 Figure 44 WISMO228 Pin Co...

Страница 11: ...Socket Pin Description 46 Table 14 GPIO Pin Descriptions 48 Table 15 Electrical Characteristics of the ADC Interface 49 Table 16 Analog to Digital Converter Pin Description 49 Table 17 Electrical Characteristics of MIC 51 Table 18 Speaker Details 52 Table 19 Electrical Characteristics of SPK 52 Table 20 Analog Audio Interface Pin Description 53 Table 21 Electrical Characteristics of the PWM Interf...

Страница 12: ...TRL Signal 77 Table 36 TX_CTRL Signal Pin Description 78 Table 37 Electrical Characteristics of the Reset Signal 79 Table 38 Reset Pin Description 80 Table 39 Reset Commands 81 Table 40 Antenna Specifications 83 Table 41 List of Recommended Equipments 87 Table 42 Operating Mode Information 89 Table 43 WISMO228 Power Consumption 90 Table 44 WISMO228 Castellation Pin Description 94 Table 45 Recommen...

Страница 13: ...VECOM owned are not provided in the documentation package Wavecom Reference Documentation WISMO218 Hardware Presentation Reference WA_DEV_W218_PTS_001 WISMO218 AT Commands Manual Reference WA_DEV_W218_UGD_003 WISMO218 Development Kit User Guide Reference WA_DEV_W218_UGD_004 Customer Process Guideline for WISMO Series Reference WM_DEV_W218_PTS_001 List of Abbreviations Abbreviation Definition AC Al...

Страница 14: ...r 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 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 G...

Страница 15: ...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 Serial Interface GSM Global System for Mobile communications HR Half Rate Hi Z High impedance Z IC Integrated Circuit IDE Integrated Development Environment IF Intermediate Frequency IMEI International ...

Страница 16: ...ated 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 PC Personal Computer PCB Printed Circuit Board PCL Power Control Level PCM Pulse Code Modulation PCS PDA Personal Digital Assistant PFM Power Frequency Modulat...

Страница 17: ...T 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 Service SPI Serial Peripheral Interface SPL Sound Pressure Level SPK SPeaKer SW SoftWare PSRAM Pseudo Static RAM TBC To Be Confirmed TDMA Time Division Multiple Access TP ...

Страница 18: ...ion 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 ...

Страница 19: ...rective 2002 95 EC which sets limits for the use of certain restricted hazardous substances This directive states that from 1st July 2006 new electrical and electronic equipment put on the market does not contain lead mercury cadmium hexavalent chromium polybrominated biphenyls PBB or polybrominated diphenyl ethers PBDE Complete Shielding All electronic parts of the WISMO228 are nearly completely ...

Страница 20: ...log audio ADC Serial bus SPI for debug trace PWM0 1 and PWM2 for buzzer output GPIOs ON OFF TX burst indicator Module ready indicator Reset Firmware Drives the WISMO228 via an AT command interface over a serial port Full GSM GPRS Operating System stack Real Time Clock with calendar Connection Interfaces The WISMO228 has a 46 pin castellation form factor which provides One ANT pin for RF in out Oth...

Страница 21: ...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 Frequency Range for Tx and Rx Transmit Band Tx Receive Band Rx GSM 850 824 to 849 MHz 869 to 894 MHz ...

Страница 22: ...SMO228 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 DCXO a Tx Rx FEM Front End Module for quad band GSM GPRS Baseband Functionalities The Baseband is composed of an ARM9 a DSP and an analog element with audio signals I Q...

Страница 23: ...echnical 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 ...

Страница 24: ...WA_DEV_W228_PTS_002 Rev 001 Page 24 of 108 Product Technical Specification Customer Design Guidelines Table 2 WISMO228 Interfaces Available Interface Driven by AT commands ...

Страница 25: ...he SPI bus Table 3 SPI Bus Pin Description Pin Signal I O I O Type Reset State Description 13 SPI IO I O 2V8 Pull down SPI Serial input output 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 I...

Страница 26: ...erence 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 No These interfaces will have AT command support in future versions ...

Страница 27: ...GPRS classes in communication mode A GSM GPRS class 2 terminal emits 577μs radio bursts every 4 615ms See Figure 5 Power Supply During Burst Emission A GPRS class 10 terminal emits 1154μs radio bursts every 4 615ms VBATT provides for the following functions Directly supplies the RF components with 3 6V It is essential to keep a minimum voltage ripple at this connection in order to avoid any phase ...

Страница 28: ... VSWR is 1 5 1 Note When powering the WISMO228 with a battery the total impedance battery protections PCB should be less than 150mΩ Pin Description Table 5 Power Supply Pin Description Pin Numbers Signal 29 30 VBATT 20 22 23 26 28 31 GND Application The reject filter can be connected between VBATT and the supply sources if the supply source is noisy Caution If the reject filter C1 L1 C2 is an opti...

Страница 29: ...ical 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 ...

Страница 30: ...en remains at HIGH level Idle Mode When the WISMO228 has a location update with a live network but with no GSM GPRS connection while the UART interface is in sleep mode Connected Mode The WISMO228 has GSM voice codec connection with a live network Transfer Mode The WISMO228 has GPRS data transfer connection with a live network Note that there are two different methods of entering sleep mode throug...

Страница 31: ...n 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 8V and VBATTtyp 3 6V Both the average current and the maximum current peaks were also measured for all three VBATT values The following consumption values were obtained by performing measurements on WISMO228 samples at a temperature of 25 C ...

Страница 32: ... TBD TBD TBD mA Connected Mode 850 MHz PCL5 TX power 33dBm TBD TBD TBD TBD mA PCL19 TX power 5dBm TBD TBD TBD TBD mA 900 MHz PCL5 TX power 33dBm TBD TBD TBD TBD mA PCL19 TX power 5dBm TBD TBD TBD TBD mA 1800 MHz PCL0 TX power 30dBm TBD TBD TBD TBD mA PCL15 TX power 0dBm TBD TBD TBD TBD mA 1900 MHz PCL0 TX power 30dBm TBD TBD TBD TBD mA PCL15 TX power 0dBm TBD TBD TBD TBD mA GPRS Transfer Mode clas...

Страница 33: ... TBD TBD TBD mA 1800 MHz Gam 3 TX power 30dBm TBD TBD TBD TBD mA Gam 18 TX power 0dBm TBD TBD TBD TBD mA 1900 MHz Gam 3 TX power 30dBm TBD TBD TBD TBD mA Gam 18 TX power 0dBm TBD TBD TBD TBD mA Current consumption in OFF mode is measured with BAT RTC being left open Idle Mode consumption depends on the SIM card used Some SIM cards respond faster than others in which case the longer the response ti...

Страница 34: ...rms 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 3 Tx power 33dBm Idle mode Paging 2 Idle mode Paging 9 Note The following diagrams only show the waveform of the current and not th...

Страница 35: ...WA_DEV_W228_PTS_002 Rev 001 Page 35 of 108 Product Technical Specification Customer Design Guidelines Transfer Mode Class 10 Current Waveform Idle Mode Page 2 Current Waveform RX PEAK TX PEAK ...

Страница 36: ... Pin Signal I O I O Type Reset State Recommended SW Driver Logic Level Output State 16 GPIO3 I O 2V8 Pull up 1 19 GPIO5 I O 2V8 Z Input 0 Output 1 24 GPIO1 I O 2V8 Pull up 1 When GPIO5 is used as a general purpose output it is necessary to have an external pull up resistor connecting to a 2 8V source The resistance value depends on the current drain required by the application side Note GPIO2 is d...

Страница 37: ...teristics 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 I O Type Minimum Typical Maximum Internal 2 8V power supply VCC_2V8 2 7V 2 8V 2 95V Input Output Pin VIL CMOS 0 4V 0 4V VIH CMOS 2 4V VCC_2V8 0 4V VOL CMOS 0 1V VOH CMOS 2 7V IOH 4mA CMOS 2 4V Absolute maximum ratings ...

Страница 38: ...PI Bus Pin Description Pin Signal I O I O Type Reset State Description 13 SPI IO I O 2V8 Pull down SPI Serial input output 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 require...

Страница 39: ...the recommended components to use in implementing the SPI to UART2 interface Component Description Details Manufacturer U103 SC16IS750IPW NXP Semiconductors X101 3 6864MHz 86SMX surface mount crystal 971 3131 Farnell R104 R105 10KΩ R106 1KΩ C105 22pF C106 33pF C107 100nF After converting the SPI signal to a UART signal a UART transceiver circuitry is needed to communicate this UART signal to the D...

Страница 40: ...lists the recommended components to use in implementing a UART transceiver circuitry Component Description Details Manufacturer U200 LTC2804IGN 1 LINEAR TECHNOLOGY L200 LQH2M CN100K02L MURATA J200 096615276119 SUBD9F HARTING R202 NC R204 100KΩ C200 1µF C201 220nF C207 1µF C208 1µF Note It is recommended to make SPI signals accessible for diagnostics by reserving some test points for example ...

Страница 41: ...T107 DSR Data Carrier Detect CT109 DCD Ring Indicator CT125 RI Pin Description The following table provides the pin descriptions of the UART interface Table 11 Main Serial Link Pin Description According to PC DTE view Note The rising time and falling time of the reception signals mainly CT103 TXD have to be less than 300ns The WISMO228 is designed to operate using all the serial interface signals ...

Страница 42: ...entation for a 5 wire UART Note All signals are specified according to PC DTE view 4 wire Serial Interface Hardware Design The signals used in this interface hardware design are as follows CT103 TXD CT104 RXD CT105 RTS CT106 CTS The signal CT108 DTR can be looped back to CT107 DSR from both the WISMO228 side and from the DTE side For a detailed configuration refer to Figure 12 Example of V24 CMOS ...

Страница 43: ... can be looped back to CT107 DSR from both the WISMO228 side and from the DTE side The signal CT105 RTS can be looped back to CT106 CTS from both the WISMO228 side and from the DTE side The flow control mechanism has to be managed from the customer side For a detailed configuration refer to Figure 11 Example of V24 CMOS Serial Link Implementation for a 2 wire UART The loop back connection of CT108...

Страница 44: ...001 Page 44 of 108 Product Technical Specification Customer Design Guidelines Power Consumption In order to go to sleep mode properly under this instead For more details refer to the discussion about AT PSSLEEP 1 in section 0 ...

Страница 45: ...MO228 against ESD air discharge at 15KV The following table lists the recommended components to use in implementing a level shifter UART Component Description Details Manufacturer R1 R2 15KΩ C1 C2 C3 C4 C5 1µF C6 100nF C7 6 8uF TANTAL 10V CP32136 AVX U1 ADM3307EACP ANALOG DEVICES J1 SUB D9 female R1 and R2 are necessary only during the Reset state to force the CT125 RI and CT109 DCD signals to HIG...

Страница 46: ...en 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 Example of V24 CMOS Serial Link Implementation for a 4 wire UART ...

Страница 47: ... this serial link with all modem signals is shown below Figure 14 Example of a Full Modem V24 CMOS Serial Link Implementation for a full UART An internal 10KΩ pull up resistor is connected on both RI and DCD to set the signals to HIGH level during the Reset state The UART interface is a 2 8V type but it is 3V tolerant Note The WISMO228 UART is designed to operate using all the serial interface sig...

Страница 48: ...ow capacitance less than 10pF have to be connected on the SIM CLK and SIM IO signals to avoid any disturbance from the rising and falling edge of the signals TVS diodes are mandatory for the Full Type Approval and they must be placed as close to the SIM socket as possible The recommended low capacitance diode array to use is the DALC208SC6 from ST Microelectronics Electrical Characteristics The fo...

Страница 49: ...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 2 1 µs SIM CLK Frequency Loaded with 30pF 3 25 MHz Pin Description The following table provides the pin description of the SIM interface Table 13 SIM Interface Pin Description Pin Signal I O I O Type Reset State Description Multiplexed 8 SIM VCC O 2V9 1V...

Страница 50: ...g the SIM socket Component Description Details Manufacturer C400 100nF D400 ESDA6V1SC6 ST D401 DALC208SC6 SGS THOMSON J400 ITT CANNON CCM03 series Refer to the SIM Card Reader sub section of section 1 Error Not a valid result for table for more information CANNON SIM Socket Connection The following table provides the pin description of the SIM socket Table 14 SIM Socket Pin Description Pin Signal ...

Страница 51: ...cal 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 ...

Страница 52: ...e following table provides the pin description of the GPIOs Table 15 GPIO Pin Descriptions Pin Signal I O I O Type Reset State 16 GPIO3 I O 2V8 Pull up 19 GPIO5 I O 2V8 Pull down 24 GPIO1 I O 2V8 Pull up When GPIO5 is used as a general purpose output it is necessary to have an external pull up resistor connected to a 2 8V source The resistance value will depend on the current drain required by the...

Страница 53: ...m Typical Maximum Unit Resolution 10 bits Sampling frequency 200 kHz Input signal range 1 general purpose input 0 1 V 1 general purpose input in div by 3 mode 0 3 V Integral non linearity INL 2 5 2 5 bit Differential non linearity DNL 1 3 bit Input impedance input resistance 120 KΩ input capacitance 10 pF Pin Description The following table provides the pin description of the Analog to Digital Con...

Страница 54: ...nded to use a differential connection instead of a single ended connection in order to reject common mode noise and TDMA noise When using a single ended connection be sure to have a very good ground plane very good filtering as well as shielding in order to avoid any disturbance on the audio path The gain of MIC inputs is internally adjusted and can be tuned using AT commands The MIC interface alr...

Страница 55: ... MICP MICN Open 2 2 KΩ Z2 MICN MICP Open Z2 MICP MICN GND 2 2 Z2 MICN MICP GND Impedance between MICP and MICN without 2 2KΩ to GND 4 5 Impedance between MICP and MICN with 2 2KΩ to GND 3 2 Maximum working voltage MICP MICN THD 10 AT VGT 1 210 mVp p Maximum rating voltage MICP or MICN 0 5 4 4 V The input voltage depends on the input micro gain set by the AT command Refer to the WISMO218 AT Command...

Страница 56: ...ded If a single ended connection is used only SPKP has to be connected The result is a maximal output power divided by 2 Also when using a single ended connection be sure to have a very good ground plane very good filtering as well as shielding in order to avoid any disturbance on the audio path Electrical Characteristics The following table describes the electrical characteristics of the micropho...

Страница 57: ...nual for more information about configuring AT commands Pin Description The following table provides the pin description of the analog audio interface Table 21 Analog Audio Interface Pin Description Pin Signal I O I O Type Description 1 SPKP O Analog Speaker positive output 2 SPKN O Analog Speaker negative output 3 MICP I Analog Microphone positive input 4 MICN I Analog Microphone negative input A...

Страница 58: ...ter 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 Example of a Differential MIC Connection without an LC Filter The capacitor C1 is highly recommended to eliminate TDMA noise and must be close to the microphone The following table lists the ...

Страница 59: ... is from 200Hz to 4kHz For more details refer to Table 18 Electrical Characteristics of MIC When using a single ended connection bear in mind that The internal input impedance value becomes 1100Ω due to the connection of the other end to ground The single ended design is very sensitive to TDMA noise A very good grounding on the MIC is a must in order to ensure good audio performance against TDMA A...

Страница 60: ...commended 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 Component Description Details Notes C1 12pF to 33pF needs to be tuned depending on the design C2 needs to be tuned depending on the design L1 needs to be tuned depending on the design Speaker SPKP ad SPK...

Страница 61: ...ection includes losing output power 6dB as compared to a differential connection The connection between the WISMO228 pins and the speaker must be designed to keep the serial impedance lower than 1 5Ω Design Recommendations General When both speaker and microphone are exposed to the external environment it is recommended to add ESD protection as close to the speaker or microphone as possible connec...

Страница 62: ...pacitors have to be soldered in parallel to the microphone as shown in the figure below CM Figure 25 Capacitor Soldered in Parallel to the Microphone Recommended Speaker Characteristics Type of speakers Electro magnetic 10mW Impedance 8Ω for hands free Impedance 32Ω for heads kit Sensitivity 110dB SPL min Receiver frequency response is compatible with GSM specifications Recommended Filtering Compo...

Страница 63: ...mponents Package 0402 Filtered band GSM900 GSM850 900 DCS PCS Value 100nH 56pF 15pF Types Inductor Capacitor Capacitor Position Serial Shunt Shunt Manufacturer Murata Murata Murata Rated 150mA 50V 50V Reference LQG15HSR10J02 or LQG15HNR10J02 GRM1555C1H560JZ01 GRM1555C1H150JZ01 or GRM1555C1H150JB01 Package 0603 Filtered band GSM900 GSM850 900 DCS PCS Value 100nH 47pF 10pF Types Inductor Capacitor C...

Страница 64: ...rack 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 Figure 27 Differential Audio Connection For single ended connections the negative pole of the microphone MICN should be connected to GND Differential Audio line is always in parallel ...

Страница 65: ...ter 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 And this audio ground should only be connected to the WISMO228 module ground as close as possible to the castellation GND pin of the WISMO228 The same case is applicable to SPKP and SPKN Also the audio interface is ESD sensitive It is a must to ...

Страница 66: ...ming for the PWM output is shown in the figure below Figure 29 Relative Timing for the PWM Output Electrical Characteristics The following table describes the electrical characteristics of the PWM interface Table 22 Electrical Characteristics of the PWM Interface Parameters Conditions Minimum Typical Maximum Unit VOH High impedance load 2 7 2 85 V Load with IoH 4mA 2 4 V VOL 0 1 V IPEAK 4 mA Frequ...

Страница 67: ...tput 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 ...

Страница 68: ...ringtones or alert tones The tone level can also be adjusted in 4dB steps or muted Figure 31 BUZZER Output Electrical Characteristics The following table describes the electrical characteristics of the BUZZER signal Table 24 Electrical Characteristics of the BUZZER Signal Parameters Conditions Minimum Typical Maximum Unit VOH High impedance load 2 7 2 85 V Load with IoH 4mA 2 4 V IPEAK 4 mA VOL 0 ...

Страница 69: ...er 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 Figure 32 Example of a BUZZER Implementation Where R1 must be chosen in order to limit the current at IPEAK max to 100mA and must be adjusted in rel...

Страница 70: ...c 1 2 Π Req C1 where Fc cut off frequency Req the total resistors in line C1 the capacitive charge on T1 and the ground Bear in mind that Fc must be higher than FBUZZ OUT Fc must be at least 64 FBUZZ OUT Note The frequency modulation of the BUZZER signal is 64 FBUZZ OUT Recommended Characteristics Electro magnetic type Impedance 7 to 30Ω Sensitivity 90 dB SPL min 10 cm Current 60 to 90mA The BUZZE...

Страница 71: ...nical 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 ...

Страница 72: ... provided on the ON OFF pin to switch the WISMO228 ON Caution All external signals must be inactive when the WISMO228 is OFF to avoid any damage when starting and to allow the WISMO228 to start and stop correctly Electrical Characteristics The following table describes the electrical characteristics of the ON OFF signal Table 26 Electrical Characteristics of the ON OFF Signal Parameter I O Type Mi...

Страница 73: ...idelines Application Figure 34 Example of the ON OFF Pin Connection Power ON Figure 35 Power ON Sequence Table 28 Power ON Sequence Minimum s Typical s Maximum s Tready 4 5 7 The ON OFF signal level is detected about 250ms after VBATT is available Note This timing might be temperature dependant ...

Страница 74: ...ld be avoided Once the WISMO228 is properly powered ON the WISMO_READY pin will set to HIGH level to acknowledge the successful powering ON of the WISMO228 before it is ready to operate The ON OFF signal can be left at LOW level until power off The recommended way to release the ON OFF signal is to detect the WISMO_READY signal within 685ms of powering ON while the level pulse of the ON OFF signal...

Страница 75: ... 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 The WISMO_READY pin will become LOW to indicate that AT commands are no longer available for the WISMO228 If the ON OFF signal is...

Страница 76: ...et to HIGH to acknowledge the successful powering ON of the WISMO228 before it is ready to operate Likewise the pin will set to LOW before powering OFF Electrical Characteristics The following table describes the electrical characteristics of the WISMO_READY signal Table 29 Electrical Characteristics of the WISMO_READY Indication Parameters I O Type Minimum Typical Maximum Unit VOH 2V8 2 7 2 8 2 9...

Страница 77: ... Table 31 Electrical Characteristics of the VCC_2V8 Signal Parameters Minimum Typical Maximum Unit VCC_2V8 Output voltage 2 70 2 80 2 95 V Output Current Full power mode 50 mA Sleep mode 3 mA Pin Description The following table provides the pin description of the VCC_2V8 voltage supply Table 32 VCC_2V8 Pin Description Pin Signal I O I O Type Description 46 VCC_2V8 O Supply Digital supply Applicati...

Страница 78: ...f the RTC is not used this pin can be left open Electrical Characteristics The following table describes the electrical characteristics of the BAT RTC signal Table 33 Electrical Characteristics of the BAT RTC Signal Parameters Minimum Typical Maximum Unit Input voltage 3 0 V Input current consumption 2 5 µA Output voltage 2 82 3 0 3 18 V Max charging current VBATT 3 6V 0 6 mA Provided by an RTC ba...

Страница 79: ... 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 Estimated supply time with an 85 mAh battery 800 hours minimum ...

Страница 80: ...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 ...

Страница 81: ...X burst Low No TX High During TX burst there will be higher current drain from the VBATT power supply which causes a voltage drop This voltage drop from VBATT is a good indication of a high current drain situation during TX burst Figure 40 TX_CTRL State During TX Burst Electrical Characteristics The following table describes the electrical characteristics of the TX_CTRL signal Table 36 Electrical ...

Страница 82: ...iption of the TX_CTRL signal Table 37 TX_CTRL Signal Pin Description Pin Signal I O I O Type Reset State Description 18 TX_CTRL O 2V8 1 TX Burst indication Application The TX burst indication signal TX_CTRL can be used to drive an LED through a transistor It can be a good visual indicator for any TX activities Figure 41 Example of a TX Status Implementation The value of R607 can be harmonized depe...

Страница 83: ...l 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 Electrical Characteristics of the Reset Signal Parameters Minimum Typical Maximum Unit Input Impedance R 100K Ω Input Impedance C 10nF F Cancellation time Ta at power up ...

Страница 84: ...y either a push button or an open collector drain transistor as shown in the figures below GND 1 2 3 Push button RESET Figure 43 Example of RESET Pin Connection with a Push Button Configuration GND RESET Reset command T1 Rohm DTC144EE Figure 44 Example of RESET Pin Connection with a Transistor Configuration An open collector or open drain transistor can also be used to drive the RESET pin due to t...

Страница 85: ...pecification 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 ...

Страница 86: ...t the antenna line from noise The length of the line shouldn t be too long no more than a few centimeters because of RF insertion loss The width of the line must be calculated in order to ensure a 50Ω characteristic impedance For this same reason the embedded RF line should likewise be kept about 1cm away from any noisy baseband signal in order to ensure a good RX sensitivity level The other end o...

Страница 87: ...ction 9 dBc The main parameters for the Transmitter are Maximum output power EGSM 33 dBm 2 dB at ambient temperature Maximum output power GSM1800 30 dBm 2 dB at ambient temperature Minimum output power EGSM 5 dBm 5 dB at ambient temperature Minimum output power GSM1800 0 dBm 5 dB at ambient temperature Antenna Specifications The optimum operating frequency depends on the application A dual band or...

Страница 88: ...ypical radiated gain 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 ...

Страница 89: ...on Consumption results are highly dependent on the hardware configuration used during measurement and this section describes the hardware configuration settings that must be used to obtain optimum consumption measurements The following hardware configuration includes both the measurement equipment and the WISMO228 with its socket up board on the WISMO218 development kit Equipments Four devices are...

Страница 90: ... Kit board consumption from the WISMO228 consumption which is measured by the other power supply the 66321B current measuring power supply Both the standalone power supply and the current measuring power supply are connected to and controlled by the computer GPIB control which is not shown in the figure The standalone power supply AX502 or VBAT may be set from 3 2V to 4 8V while the current measur...

Страница 91: ... current measuring power supply at VBATT It is for this reason that the link between VBATT and VBAT J605 must be opened by removing the solder at the top of the board in the SUPPLY area Note the following information regarding both power supplies VBATT is powered by the current measuring power supply 66321B VBAT is powered by the standalone power supply AX502 through TP602 Also take note of the fo...

Страница 92: ...er all specified consumption values are for a 3 Volt SIM card Caution The SIM card s voltage is supplied by the WISMO228 s power supply Consumption measurement results may vary depending on the SIM card used Software Configuration This section discusses the software configuration for the equipment s used and the WISMO228 settings WISMO228 Configuration The WISMO228 software configuration is simply...

Страница 93: ...ating Mode Communication Tester Configuration OFF Mode N A Alarm Mode N A Idle Mode Paging 2 Rx burst occurrence 0 5s Paging 9 Rx burst occurrence 2s Connected Mode 850 MHz PCL5 TX power 33dBm PCL19 TX power 5dBm 900 MHz PCL5 TX power 33dBm PCL19 TX power 5dBm 1800MHz PCL0 TX power 30dBm PCL15 TX power 0dBm 1900 MHz PCL0 TX power 30dBm PCL15 TX power 0dBm GPRS Transfer Mode class 8 4Rx 1Tx 850 MHz...

Страница 94: ...for all modes and configurations available Note that three VBATT voltages are used to measure consumption namely VBATTmin 3 2V VBATTtyp 3 6V and VBATTmax 4 8V The minimum maximum RF transmission power configurations are also set and measured Table 44 WISMO228 Power Consumption WISMO228 Power Consumption Operating Mode Parameters IMIN average VBATT 4 8V INOM average VBATT 3 6V IMAX average VBATT 3 ...

Страница 95: ...r Mode class 8 4Rx 1Tx 850 MHz Gam 3 TX power 33dBm mA Gam 17 TX power 5dBm mA 900 MHz Gam 3 TX power 33dBm mA Gam 17 TX power 5dBm mA 1800 MHz Gam 3 TX power 30dBm mA Gam 18 TX power 0dBm mA 1900 MHz Gam 3 TX power 30dBm mA Gam 18 TX power 0dBm mA Transfer Mode class 10 3Rx 2Tx 850 MHz Gam 3 TX power 33dBm mA Gam 17 TX power 5dBm mA 900 MHz Gam 3 TX power 33dBm mA Gam 17 TX power 5dBm mA 1800 MHz...

Страница 96: ..._002 Rev 001 Page 96 of 108 Product Technical Specification Customer Design Guidelines 1900 MHz Gam 3 TX power 30dBm mA Gam 18 TX power 0dBm mA Current consumption in OFF mode is measured with BAT RTC being left open ...

Страница 97: ...WA_DEV_W228_PTS_002 Rev 001 Page 97 of 108 Product Technical Specification Customer Design Guidelines 6 Technical Specifications Castellation Pins Pin Configuration Figure 47 WISMO228 Pin Configuration ...

Страница 98: ...Power supply for RTC backup I 29 VBATT Power supply I 7 WISMO_R EADY 2 8V WISMO Ready O 30 VBATT Power supply I 8 SIM VCC SIM power supply O 31 GND Ground Ground 9 SIM CLK SIM clock O 32 NC Not connected 10 SIM IO SIM data I O 33 NC Not connected 11 SIM RST SIM reset O 34 BUZZER 2 8V Buzzer PWM2 O 12 RESET input reset signal I 35 PWM1 2 8V DC PWM 1 O 13 SPI IO 2 8V SPI data input I O 36 PWM0 2 8V ...

Страница 99: ...information only concerns the nominal signal When the signal is configured in GPIO it can either be an Input or an Output Recommended Connection When Not Used The table below gives the recommended connection for any unused pins Table 46 Recommended Connection When Not Used Pin Signal Recommended Connection When Not Used Pin Signal Recommended Connection When Not Used 1 SPKP Open 24 GPIO1 Open 2 SP...

Страница 100: ... Connect to CT108 DTR 20 GND Ground 43 CT109 DCD Open 21 ANT Radio antenna connection 44 CT108 DTR Connect to CT107 DSR 22 GND Ground 45 CT125 RI Open 23 GND Ground 46 VCC_2V8 Open The I O direction information only concerns the nominal signal When the signal is configured in GPIO it can either be an Input or an Output Refer to Table 11 Main Serial Link Pin Description of the section discussing th...

Страница 101: ... 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 Again note that the SPI interface of the WISMO228 is not open for application use other than debug trace SPI Waveforms Figure 48 SPI Timing Diagram ...

Страница 102: ... the recommended components to use in implementing the SPI to UART2 interface Component Description Details Manufacturer U103 SC16IS750IPW NXP Semiconductors X101 3 6864MHz 86SMX surface mount crystal 971 3131 Farnell R104 R105 10KΩ R106 1KΩ C105 22pF C106 33pF C107 100nF After converting the SPI signal to a UART signal a UART transceiver circuitry is needed to communicate this UART signal to the ...

Страница 103: ...implementing a UART transceiver circuitry Component Description Details Manufacturer U200 LTC2804IGN 1 LINEAR TECHNOLOGY L200 LQH2M CN100K02L MURATA J200 096615276119 SUBD9F HARTING R202 NC R204 100KΩ C200 1µF C201 220nF C207 1µF C208 1µF Note It is recommended to make SPI signals accessible for diagnostics by reserving some test points for example Main Serial Link UART for more information regard...

Страница 104: ...be protected by 2 adjacent ground layers As a result care must be taken during PCB layout for these sensitive signals by avoiding coupling to noisy baseband through adjacent layers Environmental Specifications The WISMO228 is compliant with the following operating classes The table below lists the ideal temperature range of the environment Table 48 Operating Class Temperature Range Conditions Temp...

Страница 105: ... 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 The detailed climatic and mechanics standard environmental constraints applicable to the WISMO228 are listed in the table below Table 49 Environmental Classes ...

Страница 106: ...tions 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 to follow Figure 52 WISMO228 Dimensions ...

Страница 107: ...commended 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 html Drawer type MOLEX 99228 0002 connector MOLEX 91236 0002 holder see http www molex com Microphone Microphones can be obtained from the following recommended suppliers HOSIDEN PANASONIC PEIKER Speaker Speaker...

Страница 108: ...er 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 com ...

Страница 109: ... of the microphone inputs Length of the SIM interface lines preferably 10cm Ground plane It is recommended to have a common ground plane for analog digital RF grounds It is recommended to use a metallic case or plastic casing with conductive paint Power Supply The power supply is one of the key issues in the design of a GSM terminal and careful attention should be paid to the following Quality of ...

Страница 110: ... 1998 3GPP TS 43 064 V5 0 0 2002 04 Technical Specification Group GERAN Digital cellular telecommunications system Phase 2 General Packet Radio Service GPRS Overall description of the GPRS radio interface Stage 2 Release 5 3GPP TS 03 22 V8 7 0 2002 08 Technical Specification Group GSM EDGE Radio Access Network Functions related to Mobile Station MS in idle mode and group receive mode Release 1999 ...

Страница 111: ...3GPP TS 45 010 V5 1 0 2002 08 Technical Specification Group GSM EDGE Radio Access Network Radio subsystem synchronization Release 5 3GPP TS 46 010 V5 0 0 2002 06 Technical Specification Group Services and System Aspects Full rate speech Transcoding Release 5 3GPP TS 46 011 V5 0 0 2002 06 Technical Specification Group Services and System Aspects Full rate speech Substitution and muting of lost fram...

Страница 112: ...roup Terminals Specification of the Subscriber Identity Module Mobile Equipment SIM ME interface Release 5 ETS 300 641 1998 03 Digital cellular telecommunications system Phase 2 Specification of the 3 Volt Subscriber Identity Module Mobile Equipment SIM ME interface GSM 11 12 version 4 3 1 GCF CC V3 7 1 2002 08 Global Certification Forum Certification criteria The WISMO228 can only be used for mob...

Страница 113: ...s from RF energy has focused on the current RF technology for many years scientists have begun research regarding newer radio technologies such as GSM After existing research had been reviewed and after compliance to all applicable safety standards had been tested it has been concluded that the product was fit for use If you are concerned about exposure to RF energy there are things you can do to ...

Страница 114: ...your GSM terminal while driving please give full attention to driving pull off the road and park before making or answering a call if driving conditions so require Electronic Devices Most electronic equipment for example in hospitals and motor vehicles is shielded from RF energy However RF energy may affect some improperly shielded electronic equipment Vehicle Electronic Equipment Check your vehic...

Страница 115: ...io Construction crews often use remote control RF devices to set off explosives Potentially Explosive Atmospheres Turn your terminal OFF when in any area with a potentially explosive atmosphere It is rare but your application or its accessories could generate sparks Sparks in such areas could cause an explosion or fire resulting in bodily injuries or even death Areas with a potentially explosive a...

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