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SIM968_Hardware Design_V1.00

1. J101 H R101 OND 109 C101 C102 Figure 42 GNSS antenna matching circuit In this figure the components R101 C101 and C102 is used for antenna matching the components value only can be got after the antenna tuning Usually matching components value is provided by antenna vendor the default value of R101 is 002 and users need to reserve the place of C101 and C102 without soldering The traces in bold type should be treated as 5022 impedance controlled line in PCB layout 5 5 2 GNSS Antenna Choice Consideration To obtain excellent GNSS reception performance a good antenna will always be required The antenna is the most critical item for successful GNSS reception in a weak signal environment Proper choice and placement of the antenna will ensure that satellites at all elevations can be seen and therefore accurate fix measurements are obtained Most customers contract with antenna design houses to properly measure the radiation pattern of the final mounted configuration in a plastic housing withassociated components near the antenna Linear antennas are becoming more popular and the gain is reasonable since a smaller ground plane can be used User can consider following factors as Choose an antenna that can work botb in GPS and GLONASS bands Choose a linear antenna with a reasonably uniform hemispherical gain pattern of gt 4dBi e Use of an antenna with lower gain the
2. Com A company of SIM Tech SIM968 Hardware Design V1 00 Smart Machine Smart Decision Document Title SIM968 Hardware Design Version 1 00 Date 2013 02 25 Status Release Document Control ID SIM968 Hardware Design V1 00 General Notes SIMCom offers this information as a service to its customers to support application and engineering efforts that use the products designed by SIMCom The information provided is based upon requirements specifically provided to SIMCom by the customers SIMCom has not undertaken any independent search for additional relevant information including any information that may be in the customer s possession Furthermore system validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customer s system integrator All specifications supplied herein are subject to change Copyright This document contains proprietary technical information which is the property of SIMCom Limited copying of this document and giving it to others and the using or communication of the contents thereof are forbidden without express authority Offenders are liable to the payment of damages All rights reserved in the event of grant of a patent or the registration of a utility model or design All specification supplied herein are subject to change without notice at any time Copyright Shanghai SIMCom Wireless Solutions Ltd
3. MODULE KBC1 KBC2 i KBC3 ko KBRO KEE H ti fe KBR1 El PN DL KBR2 la i Es Figure 30 Reference circuit of the keypad interface Please contact SIMCom for more details SIM968 Hardware Design V1 00 36 Default state Output Pull down Output Pull down Output Pull down Output Pull down Output Pull down Output Pull down 2013 02 25 Smart Machine Smart Decision SIM968 provides an auxiliary ADC which can be used to measure the voltage User can use AT command AT CADC to read the voltage value For details of this AT command please refer to document 1 Table 15 ADC specification Voltage range 0 2 8 V ADC Resolution 10 bits Sampling rate 200K Hz 4 12 RI Behaviors Table 16 RI behaviors Standby High The pin is changed to low When any of the following events occur the pin will be changed to high 1 Establish the call 2 Hang up the call Voice call The pin is changed to low When any of the following events occur the pin will be changed to high 1 Establish the call 2 Hang up the call Data call SMS The pin is changed to low and kept low for 120ms when a SMS is received Then it is changed to high RO The pin is changed to low and kept low for 120ms when some URCS are reported Then it is changed to high For more details please refer to document 8 The behavior of the RI pin is shown in the following figure when the module is used as a receiver R
4. MODULE VRTC 10K RTC ON p 04 3 Nom chargeable ERR Battery Figure 16 RTC supply from non chargeable battery e Rechargeable battery for RTC MODULE VRTC 10K RTC Rechargeable i Backup Battery E Figure 17 RTC supply from rechargeable battery Coin type rechargeable battery is recommended such as XH414H IVO1E from Seiko can be used Typical charge discharge curves for this battery are shown in the following figure Charge Discharge Characteristics 3 5 T T T T i i i K ees esac Se J i i i 2 5 Pa EE ses SE descens ee eae eae i i gt 2 0 gt 4 sten O I B 1s5L 4 e Charge 3 3V 50yA 5hr RT CC CV S i l Discharge 20uA cov ov CC l 1 0 AE EE eee 1 0 5 pers E EE EE peces 0 0 0 20 40 60 80 100 Capacity uAh Figure 18 Seiko XH414H IV01E charge discharge characteristic SIM968_Hardware Design_V1 00 28 2013 02 25 Smart Machine Smart Decision 4 6 Serial Interfaces SIM968 provides two unbalanced asynchronous serial ports One is the serial port and the other is the debug port The module is designed as a DCE Data Communication Equipment The following figure shows the connection between module and client DTE MODULE DCE CUSTOMER DTE Serial port Serial port1 RXD RXD RTS ne RTS CTS mo CTS DR a a DR D
5. Povver do wh Minimum functionality mode Charge only mode Charge during operation mode normal Smart Machine Smart Decision Normal power down by sending the AT command AT CPOWD 1 or using the PWRKEY The power management unit shuts down the power supply for the baseband part of the module and only the power supply for the RTC is remained Software is not active The serial port is not accessible Power supply connected to VBAT remains applied AT command AT CFUN can be used to set the module to a minimum functionality mode without removing the power supply In this mode the RF part of the module will not work or the SIM card will not be accessible or both RF part and SIM card will be closed and the serial port is still accessible The power consumption in this mode is lower than normal mode The module will enter Charge only mode automatically when a charger and battery are connected to a switched off SIM968 In this mode the module does not search for network and has limited access to available AT commands available The module can also enter Charge only mode from Charge mode during normal operation by normally powered down the module The module will automatically go to this mode when a charger is connected to a Normal operation mode module when battery voltage is not lower than 3 2V Normal operation mode includes SLEEP IDLE TALK GPRS IDLE and GPRS DATA 2 3 SIM968 Functional Diagram
6. SIM L 22pF CARD DE SMP05C L Figure 26 Reference circuit of the 8 pin SIM card holder Note The SIM Presence pin is multiplexing with KBCO PIN 34 SIM968 Hardware Design V1 00 33 2013 02 25 Smart Machine Smart Decision The SIM PRESENCE pin is used for detection of the SIM card hot plug in User can select the 8 pin SIM card holder to implement SIM card detection function AT command AT CSDT is used to enable or disable SIM card detection function For details of this AT command please refer to document 1 If the SIM card detection function is not used user can keep the SIM PRESENCE pin open The reference circuit of 6 pin SIM card holder is illustrated in the following figure 100nF 17 SIM CARD SIM VDD S SIM RST 22R el vcc GND SIM CLK 22R T RST VPP MODULE CLK VO C707 10M006 5122 SIM DATA M 22R A SMFO5C Figure 27 Reference circuit of the 6 pin SIM card holder 48 2 Design Considerations for SIM Card Holder For 6 pin SIM card holder SIMCom recommends to use Amphenol C707 10M006 5122 User can visit http www amphenol com for more information about the holder ON mem NG RUTES TAOS ER DE ew PAIS KO WAY 30 1 Figure 28 Amphenol C707 10M006 5122 SIM card holder SIM968 Hardvare Design V1 00 34 2013 02 25 e Bi i Com aag
7. The following figure shows a functional diagram of SIM968 Flash The GSM baseband engine The GNSS engine The GSM radio frequency part The antenna interface The other interfaces ei RIC Radio P Power management unit Frequency ower g supply Power Digital Interface o y supply SIM aa GE UART Leit Analog base Digital base gt f Reypad 4 Analog Interface Ee band band GPIOs PWMs mm gt gt Audio PC kat LCD SPI AHH ADE Jl Jl GNSS i i UART i FLASH Figure 1 SIM968 functional diagram SIM968 Hardvare Design V1 00 12 2013 02 25 Smart Machine Smart Decision 3 Package Information 3 1 Pin out Diagram s gt e 33 BI E R Ha ssa KK SE 2568 8222 807978 77767574737271 70 6968676665646362 61 gel 60 ow ae 2 59 GSM ANT Powerxey 3 58 WD Ss 4 5700 go 5 56 120 504 MSP Dr 6 55 LC a ges Dia 7 54 PS VAKELP mse VC 8 53 SNE Dap co 9 52 status Go 10 Si ne wes 11 50 Pew ws_vec 12 49 Fw V BACKUP 13 AR Pw Ge 14 47 AIC 3 10 15 46 AABET NM GPS RuD 16 45 NC zm Data 17 44 VDD EXT SIM RESET 18 43 MD Sm_cLK 19 42 VRIC SIM voo 20 41 oo el 2223242526272829 3031 SE 3536 3738 3940 E 8 2552 2800548522382 egg PEE gd UU INS DE WES PELS E Figure 2 SIM968 pin out diagram Top view 3 2 Pin Description Tabl
8. AT SGPIO The input voltage level of the GPIO can also be read by the AT command AT SGPIO For more details please refer to document 1 Table 18 Pin definition of the GPIO interface Pin name Pin number Default function Second function Default state GPIO1 KBRO 31 GPIO1 KBRO Output pull down GPIO2 KBR1 32 GPIO2 KBRI Output pull down GPIO3 KBR2 33 GPIO3 KBR2 Output pull down GPIO4 KBCO 34 GPIO4 KBCO Output pull down GPIO5 KBC1 35 GPIO5 RBCI Output pull down GPIO6 KBC2 36 GPIO6 KBC2 Output pull down 4 15 External Reset The external NRESET pins used to reset the module This function is used as an emergency reset only when AT command AT CPOWD 1 and the PWRKEY pin have no effect The NRESET pin could be pulled down to reset the module The reset timing is illustrated in the following figure VBAT Min 20uS Typ 50uS Min 1 2S I I NRESET e Pia gt Vins 24V STATUS OUTPUT i VoH gt 2 7V Va lt 0 1V i Figure 36 Reset timing This pin is already pulled up in the module so the external pull up resistor is not necessary A 100nF capacitor SIM968 Hardware Design V1 00 39 2013 02 25 Smart Machine Smart Decision close to the NRESET pin is strongly recommended A reference circuit is shown in the following figure VDD ExT wel NRESET Reset logic 4 7K CJ 100nF Reset impulse 47K MODULE Figure
9. 2013 SIM968_Hardware Design_V1 00 2 2013 02 25 Smart Machine Smart Decision Contents Contents ssessnessreenneennevnnennnennnennnennnesnnennnennnennnennnesnnennneenneenneennennneenneenneensenneenneenneennnenneeenennnnennnennnenenennnennnenenenenenenenenee 3 Version History AAA EIT E E E E E E 7 Wi CN AA AA AA 8 2 SIM968 OVELVICW svsssssssssesseascassvscenesscsascscnsecsescvenssenssaysvseusessesesonsswscesssecenseunses ss sms SVS Orio VES ESKES 8 2 1 SIM968 Key Features 9 2 2 Operating Modes cent mt SA 11 2 3 SIM968 Functional Dia eran ie akn Kai iiba Ze ee ee Grupe 12 3 Package Information eeseeevveveenneenneenneenneennnenneenneennnennnennnennnnnnnennnennnennnnnnnennnennnennnennnennnenndenkaennnenet ngsennnennnenesee 13 3 1 Pin out Diagram ds cases sukess An AN 13 3 2 e ER el Te RE EE 13 3 3 Package Dimensi ns eren rocs eege ec dasa sele 16 4 GSM Application E CTT n WE 18 4 1 GSM Power Supply ites iaia E GE aa a ad 18 4 1 1 Minimizing Voltage Drop of VNBAT EE 19 4 1 2 Monitoring Power Supply EE 19 4 2 Power on down Scenarios EE 19 e Power on SIM968 isete ay NG sia Nama E eta 19 4 22 Power down CH KEEN kaa Na EE 21 4 2 3 Restart SIM968 by PWRKEY Pin ae n igan eeenssesssessressrensressressressressesstsstnsrttsstnsrtnsrenssenssensesressetst 22 4 3 Power Saving Mode 1 a Rg Na Daanan 23 4 3 1 Minimum Functionality Mode a aa 23 4 3 2 Sleep Mode 1 AT CSCLAR1 Ny ec eceeceescsssessessessesssestecseso
10. SBAS messages are broadcast via geostationary satellites able to cover vast areas Several countries have implemented their own satellite based augmentation system Europe has the European Geostationary Navigation Overlay Service EGNOS which covers Western Europe and beyond The USA has its Wide Area Augmentation System WAAS Japan is covered by its Multi functional Satellite Augmentation System MSAS India has launched its own SBAS program named GNSS and GEO Augmented Navigation GAGAN to cover the Indian subcontinent SIM968 module supports SBAS and RTCM but only one mode can be applied at one time and SBAS is the default feature customers who want to apply RTCM in the design can contact SIMCom sales for supporting 5 5 GNSS Antenna Interface 5 5 1 GNSS Antenna Interface The RF interface has an impedance of 50Q To suit the physical design of individual applications SIM968 offers the interface as GPS_ANT pad The customer s GNSS antenna can be located in the customer s main board and connect to module s GPS_ANT pad through microstrip line or other type RF trace which impendence must be controlled in 50Q The customer s main board under the GPS_ANT pad should be copper keep out To minimize the loss on the PCB RF path it SIM968_Hardware Design_V1 00 45 2013 02 25 Smart Machine Smart Decision must be very careful in layout MODULE GND Matching circuit i Antenna feed pad i i GPS ANT
11. 25 33 SEH Smart Machine Smart Decision A company of SIM Te DISP D C 8 O DISP CS 9 O I2C SDA 56 O PC serial bus data If these pins are unused DC SCL 55 I O TC serial bus clock keep open GPIO1 KBRO 31 GPIO1 keypad row 0 GPIO2 KBR1 32 GPIO2 keypad row 1 GPIO3 KBR2 33 GPIO3 keypad row 2 o If these pins are unused GPIO4 KBC0 VO GPIO4 keypad column 0 SIM card 34 keep open SIM PRESENCE detection GPIO5 KBC1 35 GPIO5 keypad column 1 GPIO6 KBC2 36 GPIO6 keypad column 3 RXD 68 I Receive data TXD 71 O Transmit data If only TXD and RXD RTS 66 O Request to send are used it is suggested CIS 67 I Clear to send to pull down DTR and DCD 70 O Data carrier detect others pins can be kept RI 69 O Ring indicator ERE DTR 72 I Data terminal ready DBG_TXD 38 O For debugging and upgrading If these pins are unused DBG RXD 39 I firmware keep open GPS TXD 15 O I S If these pins are unused For GNSS NMEA information output GPS RXD 16 I keep open GPS TXDI 29 O 3 la ny If these pins are unused Serial communication for RTCM GPS RXDI 30 I keep open Voltage supply for SIM card Support SIM VDD 20 O i 1 8V or 3V SIM card Jes interface should be SIM DATA 17 T O SIM data input output 5 protected against ESD SIM CLK 19 Go Jemdsd with a TVS diode array SIM RST 18 O SIM reset ADC 47 I Input voltage range OV 2 8V If it is unused keep open PWMI 48 O PWM If these pins are unused PWM2 49 O PWM keep open PWM3 5
12. 5 6 For the module s output power the following should be noted At GSM900 and GSM850 band the module is a class 4 device so the modules output power should not exceed 33dBm and at the maximum power level the output power tolerance should not exceed 2dB under normal condition and 2 5dB under extreme condition At DCS1800 and PCS1900 band the module is a class 1 device sosthe modules output power should not exceed 30dBm and at the maximum power level the output povver tolerance should not exceed 2dB under normal condition and 2 5dB under extreme condition 6 10 2 Module RF Receive Sensitivity The following table shows the module s conducted receive sensitivity it is tested under static condition Table 33 SIM968 conducted RF receive sensitivity GSM850 109dBm 107dBm EGSM900 109dBm 107dBm DCS1800 109dBm 107dBm PCS1900 109dBm 107dBm 6 10 3 Module Operating Frequencies The following table shows the module s operating frequency range it is followed by the 3GPP TS 05 05 technical specification requirement Table 34 SIM968 operating frequencies SIM968_Hardware Design_V1 00 54 2013 02 25 Qeses SL com Smart Machine Smart Decision GSM850 869 894MHz 824 849 MHz EGSM900 925 960MHz 880 915MHz DCS1800 1805 1880MHz 1710 1785MHz PCS1900 1930 1990MHz 1850 1910MHz 6 11 Module label information The following figure marked the information of SIM968 module Figure 45 Module l
13. ANT PAD PIN 79 GSM ANT PAD PIN59 SIN968 2 ca a i SN MP061302000000 IMEI 01322600816990 TU CE 0980 Mama Figure 38 The RF interface of module The customer s main board under the GSM ANT pad should be copper keep out The customer s GSM antenna can be located in the customer s main board and connect to module s GSM ANT pad through microstrip line or other type RF trace whichimpendence must be controlled in 5092 To facilitate the antenna tuning and certification test a RF connector and an antenna matching circuit should be added The following figure is the recommended circuit MODULE GND RF test connector PA BU a A f Matching circuit Antenna feed pad i I GMAT O i 101 R101 R102 i GND o J102 C101 C102 Figure 39 GSM antenna matching circuit In this figure the components R101 R102 C101 and C102 is used for antenna matching the components value only can be got after the antenna tuning Usually matching components value is provided by antenna vendor the default value of R101 and R102 are 0Q and reserve the place of C101 and C102 without soldering The RF test connector in figure 39 is used for conducted RF performance test and should be placed as close as possible to the module s RF ANT pad The traces in bold type should be treated as 50Q impedance controlled line in PCB layout For details about radio frequency
14. NTC thermistor and it is recommended to use MURATA NCP15XH103F03RC Its impedance is 10Kohm at 25 C Refer to the above figure for the reference circuit SIM968_Hardware Design_V1 00 24 2013 02 25 Smart Machine Smart Decision 4 4 1 Battery Pack Characteristics SIM968 has optimized the charging algorithm for the Li lon battery that meets the characteristics listed below e The maximum charging voltage of the Li lon battery pack is 4 2V and the recommended capacity is 1 100mAh The Battery packs with more than 1100 mAh capacity will take more time for charging e The battery pack should have a protection circuit to avoid overcharging deep discharging and over current and the circuit should be insensitive to pulsed current e The internal resistance of the battery pack including protection circuit should be as low as possible Its recommended value does not exceed 150mQ The battery pack must be protected from reverse pole connection On the SIM968 the build in circuit of the power management chipset monitors the supply voltage constantly Once the Under voltage is detected the SIM968 will be powered down automatically 4 42 Recommended Battery Pack Following is the specification of recommended battery pack Table 7 Specification of recommended battery pack Items Description Battery type Li ion Manufacturer Jiade Energy Technology Normal voltage 3 7V Capacity NORMAL 1100mAh Charge Voltage 4 200 0 050V Max Charge
15. ONS 49 TABLE 22 RECOMMENDED OPERATING CONDITIONS 49 TABLE 23 DIGITAL INTERFACE CHARACTERISTICS OF GSM 49 TABLE 24 DIGITAL INTERFACE CHARACTERISTICS OF CNS 50 TABLE 25 SIM CARD INTEREACRCHARACTERISTICH soseri riri rirssssssesererrren 50 TABLE 26 VDD_EXT CHARACTERISTICS csssssesssssesssssesssssesssseesssseesssssecssssscsssssessssscsssvssssesesssecssssecsesnesssesesseessses 50 TABLE 27 SIM VDDCHARACTERISTICH titi niisrsass boboot toti nirss nostni ti nini rsassa aranse oeren 51 TABLE 28 VRTC CHARA RARE IOS EE 51 TABLE 29 GSM CURRENT CONSUMPTION ccesscssssscsssessssecsssessssesssuccsssesssvessuscsssesssvessusessevessucsssessuvessusesserssseesens 51 TABLE 30 THE ESD CHARACTERISTICS TEMPERATURE 25 C HUMIDITY 45 gai 52 TABLE 31 SIM968 GSM 900 AND GSM 850 CONDUCTED RF OUTPUT POWER 53 TABLE 32 SIM968 DCS 1800 AND PCS 1900 CONDUCTED RF OUTPUT POWER 53 TABLE 33 SIM968 CONDUCTED RF RECEIVE SENSITIVITY sccesssssssessssessssecsssessssesssvcessecssvesssueesseesssvssanecsssessees 54 TABLE 34 SIM968 OPERATING EREOUENCIES ti tsesst tt tiise bt kt tras ttt iIa at E aasa t erasana terasna taenn ras 54 TABLE 35 ILLUSTRATION OF MODULE LABEL nmanamsnuman 55 TABLE 26 RELATED DOCUMENTS ei GAGANA NG toda NAIA ARABIAN NGA AA 56 TABLE 37 TERMS AND ARBBRENVLATIONS nA NANANA ANAN nn nananana 57 TABLE 38 SAFETY SG OS 58 SIM968 Hardware Design V1 00 5 2013 02 25 Smart Machine Smart Decision Figure Index FIGURE 1 SIM968 FUNCT
16. allowed but Time to First Fix performance and tracking sensitivity may be degraded 6 3 Digital Interface Characteristics Table 23 Digital interface characteristics of GSM SIM968 Hardvare Design V1 00 49 2013 02 25 som Smart Machine Smart Decision These parameters are for digital interface pins such as keypad GPIO PC UART LCD PWMs and DEBUG Table 24 Digital interface characteristics of GNSS 64 SIM Card Interface SS Table 25 SIM card interface dat 6 5 VDD EXT Characteristics Table 26 VDD EXT characteristics SIM968 Hardware Design V1 00 50 2013 02 25 som Smart Machine Smart Decision 6 6 SIM VDD Characteristics Table 27 SIM VDD characteristics 6 7 VRTC Characteristics Q Table 28 VRTC characteristics K LS V 6 8 Current Consumption vm Table 29 GSM current consumption SIM968 Hardware Design V1 00 2013 02 25 GSM 850 EGSM 900 Data mode GPRS 1Rx 1Tx DCS 1800 PCS 1900 GSM 850 EGSM 900 Data mode GPRS 4Rx 1Tx DCS 1800 PCS 1900 GSM 850 EGSM 900 Data mode GPRS 3Rx 2Tx DCS 1800 PCS 1900 IVBAT peak Peak current During Tx burst In above table the current consumption value is the typical one of the module tested in laboratory In the mass production stage there may be differences among each individual 6 9 Electro Static Discharge Smart Machine Smart Decision pers PCILES PCL 12 PCL 19 PCL 0 IMCIL 7 Peb PCL 5 PCL 12 PCL 1
17. commands correlative with RF function and SIM card function will not be accessible For detailed information about the AT Command AT CFUN fun gt please refer to document 1 Table 6 The current consumption of Minimum Functionality Mode lt fun gt Current consumption uA sleep mode 0 651 1 1500 4 715 4 3 2 Sleep Mode 1 AT CSCLK 1 User can control SIM968 module to enter or exit the sleep mode 1 AT CSCLK 1 by DTR signal When DTR is in high level and without interrupt on air and hardware such as GPIO interrupt or data in serial port SIM968 will enter sleep mode 1 automatically In this mode SIM968 can still receive paging or SMS from network but the serial port is not accessible Note For SIM968 it requests to set AT command AT CSCLK 1 and ensure DTR at high level to enable the sleep mode 1 the default value is 0 which can not make the module to enter sleep mode For more details please refer to document 1 4 3 3 Wake Up SIM968 from Sleep Mode 1 AT CSCLK 1 When SIM968 is in sleep mode I AT CSCLK 1 the following methods can wake up the module e Pull down DTR pin The serial port will be active after DTR pin is pulled to low level for about 50ms SIM968 Hardware Design V1 00 23 2013 02 25 Smart Machine Smart Decision e Receive a voice or data call from network e Receive a SMS from network 4 3 4 Sleep Mode 2 AT CSCLK 2 AT CSCLK 2 can set module to the sleep mode 2 In this mode SI
18. document 1 4 2 3 Restart SIM968 by PWRKEY Pin When the module works normally if the user wants to restart the module follow the procedure below 1 Powerdown the module 2 Wait for at least 800mS after STATUS pin changed to low level 3 Power on the module Power down Tdelay gt 800mS Restart PWRKEY STATUS Figure 13 Timing of restart SIM968 SIM968_Hardware Design_V1 00 22 2013 02 25 Smart Machine Smart Decision 4 3 Power Saving Mode SIM968 have two sleep modes sleep mode I is enabled by hardware pin DTR sleep mode 2 is only enabled by serial port regardless of the DTR In sleep mode the current of module is very low The AT command AT CFUN lt fun gt can be used to set SIM968 into minimum functionality When SIM968 is in sleep mode and minimum functionality the current of module is lowest 4 3 1 Minimum Functionality Mode There are three functionality modes which could be set by the AT command AT CFUN lt fun gt The command provides the choice of the functionality levels lt fun gt 0 1 4 e AT CFUN 0 minimum functionality AT CFUNS 1 full functionality default AT CFUN 4 flight mode disable RF function Minimum functionality mode minimizes the current consumption to the lowest level If SIM968 is set to minimum functionality by AT CFUN 0 the RF function and SIM card function will be disabled In this case the serial port is still accessible but all AT
19. trace layout please refer to document 9 SIM968_Hardware Design_V1 00 41 2013 02 25 Smart Machine Smart Decision 5 GNSS Application Interface 5 1 Power Management 5 1 1 GNSS Power Input The GPS_VCC supply range is from 2 8V to 4 3V and it should be able to provide sufficient current up to 100mA 5 1 2 Starting GNSS Engine e When GNSS power is first applied The GNSS Engine goes into operation mode 5 13 Verification of GNSS Engine Start System activity indication depends upon the chosen serial interface When it is activated SIM968 will output messages at the selected UART speed and message types 5 14 Power Saving Modes SIM968 supports operating modes for reduced average power consumption like sleep mode backup mode periodic mode and AlvvaysLocate Y mode e Sleep mode In this mode the receiver stays at full on power state When this mode that can be wake up by the host sends the command through the communication interface or external interrupt e Backup mode In this mode the SIM968 must be supplied by the backup and it can help to count down the time for backup mode Software on host side to send the command through the communication interface into the backup mode e Periodic mode In ds mode the SIM968 enters tracking and sleep modes according to the interval configured by users in the commands e AlvvaysLocate Y mode AlvvaysLocate is an intelligent controller of SIM968 periodic mode Depending on the env
20. 0 O PWM GSM ANT 59 I O GSM radio antenna connection Impendence must be SIM968 Hardware Design V1 00 15 2013 02 25 Ri Si Com Smart Machine Smart Decision controlled to 509 Impendence must be GPS ANT 79 I GNSS radio antenna connection E controlled to 509 RF SYNS 53 O RF synchronization If unused keep open RESET 4 I GSM Reset input active low If unused keep open AADET N 46 I GNSS Active Antenna Detect If unused keep open GNSS i ak from Backi GPS WAKEUP 54 I es na Ng paaa aaa aa If unused keep open is mode active High This pin should be kept open NC 45 Not Connected 3 3 Package Dimensions detail B al L100 S detail A detail B scale 21 scale 5 1 Figure 3 Dimensions of SIM968 Unit mm SIM968_Hardware Design_V1 00 16 2013 02 25 Smart Machine Smart Decision 00000000000000000000 Figure 4 Recommended PCB footprint outline Unit mm SIM968 Hardware Design V1 00 17 2013 02 25 Smart Machine Smart Decision 4 GSM Application Interface 4 1 GSM Power Supply The GSM power supply range of SIM968 is from 3 2V to 4 8V The transmitting burst will cause voltage drop and the power supply must be able to provide sufficient current up to 2A For the VBAT input a bypass capacitor low ESR such as a 100 uF is strongly recommended this capacitor should be placed as close as possible to SIM968 VBAT pins The following figure is the reference
21. 37 Reset reference design circuit NOTE It is recommended to cut off the VBAT power supply directly instead of using external reset pin mhen SIM968 can not respond to the AT command AT CPOWD 1 and PWRKEY pin 4 16 PWM SIM968 provides 3 PWMs which can be used to drive a vibrator and a backlight LED for display or keyboard PWM and PWM2 output frequency varies from 25 6KHz to 3 25MHz Two 7 bit unsigned binary parameters are used for the output period and for the duty cycle The PWM3 for the buzzer outputs a square wave at the desired tone frequency The tone frequencies are programmable from 200 HzZ to 5 kHz and can be re programmed on the fly to generate monophonic audio ring tones or alert tones The tone level can be adjusted over a 24 dB range in 4 dB steps or it can be muted The AT command AT SPWM is used to set the output period and duty cycle of the PWM For details please refer to document 1 4 17 PC Bus The SIM968 provides an I C interface which is only used in the embedded AT application Note This function is not supported in the standard firmware If user wants this function the firmware must be customized Please contact SIMCom for more details 4 18 GSM Antenna Interface The RF interface has an impedance of 5092 To suit the physical design of individual applications SIM968 offers the interface as GSM ANT PAD SIM968 Hardware Design V1 00 40 2013 02 25 Smart Machine Smart Decision GPS
22. 8 DDLO charging state occurs Table 9 AT command usually used in Charge only mode AT command Function AT CCLK Set data and time of RTC AT CPOWD Power down AT CBC Indicated charge state and voltage AT CFUN Start or close the protocol Set AT command AT CFUN 1 module can be transferred from Charge only mode to Charging in normal mode In Charge only mode the default value is 0 4 45 Charger Requirements Following is the requirements of charger for SIM968 e Simple transformer power plug Output voltage 5 0V 6V Minimum supply current 750mA A 10V peak voltage is allowed for m ximum Ims when charging current is switched off A 1 6A peak current isallowed for maximum Ims when charging current is switched on 45 RTC Backup Current input for RTC when the VBAT is not supplied for the system Current output for backup battery when the VBAT power supply is in present and the backup battery is in low voltage state The RTC power supply of module can be provided by an external capacitor or a battery non chargeable or rechargeable through the VRTC The following figures show various reference circuits for RTC back up e External capacitor for RTC MODULE VRTC 10K EE O RTC po S i Core Large capacitance Co Capacitor 7 N SIM968 Hardware Design V1 00 27 2013 02 25 Smart Machine Smart Decision Figure 15 RTC supply from capacitor e Non chargeable battery for RTC
23. 9 PCL 0 PEI SIE BCL PCL 12 PCL 19 PCL 0 PEI REPS 76 240 110 83 170 95 80 270 150 120 210 130 115 435 185 130 320 155 122 2 A SIM968 is an ESD sensitive component so more attention should be paid to the procedure of handling and packaging The ESD test results are shown in the following table Table 30 The ESD characteristics Temperature 25 C Humidity 45 Pin VBAT GPS VCC GND RXD TXD GPS RXD GPS RXD Antenna port SPKP SPKN MICP MICN PWRKEY Contact discharge 5KV 5KV 5KV 4KV 4KV 5KV 4KV 4KV Air discharge 10KV 10KV 10KV 8KV 8KV 10KV 8KV 8KV Note It is suggested that customers in serials with 1000hm resistances on UART lines for ESD consideration SIM968 Hardware Design V1 00 52 2013 02 25 um Smart Machine Smart Decision 6 10 Radio Characteristics 6 10 1 Module RF Output Power The following table shows the module conducted output power it is followed by the 3GPP TS 05 05 technical specification requirement Table 31 SIM968 GSM 900 and GSM 850 conducted RF output power NG Table ee 1800 and PCS 1900 conducted RF output power SIM968 Hardware Design V1 00 53 2013 02 25 Smart Machine Smart Decision 3 24 3 4 4 D 3 4 5 20 3 4 6 18 3 4 H 16 3 4 8 14 3 4 9 12 4 225 10 10 4 255 11 8 4 E5 12 6 4 355 13 4 4 5 14 2 5 6 15 28 0
24. And UVLO means the battery voltage is less than 3 3V and more than 1 5V The battery is not suitable for fast charging when its condition is DDLO or UVLO The SIM968 provides a small constant current to the battery when the battery is between DDLO and UVLO In DDLO charging state SIM968 gives out lmA current to the battery And in UVLO charging state SIM968 provides about less than 200mA current to the battery DDLO charging terminates when the battery voltage reaches 1 5V UVLO charging terminates when the battery voltage is up to 3 3V Both DDLO and UVLO charge are controlled by the SIM968 hardware only Fast charge If there is a charger supply and battery present and the battery is not in DDLO and UVLO SIM968 will enter fast charge state Fast charge is controlled by the software to make the current voltage regulation The charging scheme for the Li Ion battery is constant current about 550MA first followed by constant voltage charging once 4 2V is reached Charging is stopped when the charging current at constant voltage has decreased to the pre set current 4 44 Operating Modes during Charging The battery can be charged during various operating mode That means that charging can be in progress while SIM968 is in Normal mode SLEEP IDLE TALK GPRS IDLE or GPRS DATA mode In this case the voltage supply should be sufficient Here Charging in Normal mode is named as Charge mode If the charger is connected to the module s VCHG Pi
25. CD Wb DCD RI m po RING Debug port Serial port2 DBG_TXD pe TXD DBG RXD 04 RXD Figure 19 Connection of the serial interfaces If only RXD and TXD are used in user s application other serial pins should be kept open Please refer to following figure MODULE DCE CUSTOMER DTE Serial port Serial port1 TXD as ae TXD RXD Bo RXD RTS Ox RTS CTS Ge CTS DTR Q X DTR DED Q X DCD RI X RING Debug port Serial port2 DBG TXD Dee TXD DBG RXD RXD Figure 20 Connection of RXD and TXD only Note If user set sleep model the DTR should be connected 4 6 1 _ Function of Serial Port and Debug Port Serial port e Full modem device Contains data lines TXD and RXD hardware flow control lines RTS and CTS status lines DTR DCD and RI Serial port can be used for CSD FAX GPRS service and AT communication It can also be used for multiplexing function For details about multiplexing function please refer to document 3 Serial port supports the following baud rates 1200 2400 4800 9600 19200 38400 57600 and 115200bps e Autobauding only supports the following baud rates SIM968 Hardware Design V1 00 29 2013 02 25 Smart Machine Smart Decision 1200 2400 4800 9600 19200 38400 and 57600bps e The default setting is autobauding Autobauding allows SIM968 to automatically detect the baud rate of the host device Pay more attention to the following requirements e Syn
26. Current 1 0C Charge Method CC CV Constant Current Constant Voltage Max Discharge Current 1 0C for continuous discharging mode Discharge Cut off Voltage 3 0V cell Internal resistance Initial lt 130mQ 443 Implemented Charging Technique SIM968 has battery charging function There are three pins related to the battery charging function there are VCHG VBAT and TEMP BAT ADCO pins The VCHG Pin is driven by an external voltage system can use this Pin to detect a charger supply and provide most charging current through SIM968 module to battery when charging is in fast charge state VBAT pin gives charging current to external battery from SIM968 module TEMP BAT Pin is for user to measure the battery temperature Let this Pin open if battery temperature measurement is not user s design concern It is very simple to implement charging function user just needs to connect the charger to the VCHG Pin and connect the battery to the VBAT Pin SIM968 battery charging happens after detecting charger supply and the presence of battery If there is no charger SIM968 Hardware Design V1 00 25 2013 02 25 Smart Machine Smart Decision supply or no battery present charging function will not be enabled Normally there are three main states in the whole charging procedure e DDLO charge Pull up mode and UVLO charge Pre charge mode Fast charge DDLO charge and UVLO charge DDLO is the state of battery when its voltage is under 1 5V
27. ENGINE KEY FEATURES UNAN nnaman 9 TABLE 2 GNSS ENGINE PERFORMANCE ssssssiiiisssttitetsssstt teest kt itse tkt inss tkt i 1s s AEEA AISE EEE AISEEE E AEE rrsan arrana 10 TABLE 3 CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE 11 TABLE 4 OVERVIEW OF OPERATING MODES 20111221 ANAK NAK GEL AIS EEE AISEEE aane irrst arrera 11 BSI 13 TABLE 6 THE CURRENT CONSUMPTION OF MINIMUM FUNCTIONALITY MODE umaasang 23 TABLE 7 SPECIFICATION OF RECOMMENDED BATTERY BACK 25 TABLE 8 CHARGE OPERATING MODES usman Cia 26 TABLE 9 AT COMMAND USUALLY USED IN CHARGE ONLY MODE wana makauna Magdusa 27 TABLE 10 MICROPHONE INPUT CHARACTERISTICS nng ma gd kaaa 32 TABLE 11 AUDIO OUTPUT CHARACTERISTICS at 33 TABLE 12 PIN DESCRIPTION AMPHENOL SIM CARD HOLDER 35 TABLE 13 PIN DESCRIPTION MOLEX SIM CARD HOLDER wanna 35 TABLE 14 PIN DEFINITION OF THE KEYPAD DNTEREACE Barier pecssecssssecsesseesssseesssneesssnecsses 36 TABLE 15 ADC SPECIFICATION wada bay igestcesssuccssesssessaresssvessuecsseessseesens 37 TABLE 16 RI BEHAVIORS sssscsssssessssssessssecssssccssseccsssvecsssvccssevccsseecssup tnssses NG aaa aaa 37 TABLE 17 STATUS OF THE NETLIGHT PIN LX ach AWA aman 38 TABLE 18 PIN DEFINITION OF THE GPIO INTERFACE 39 TABLE 19 POWER SUPPLY AND CLOCK STATE ACCORDING TO OPERATION MODE 42 TABLE 20 ABSOLUTE MAXIMUM RATINGS OF GSM NurMarrrnssserssssersseseerevsrerevseeeesseresseensssernessernessereessereesernen 49 TABLE 21 ABSOLUTE MAXIMUM RATINGS OF
28. FIGURE 17 RTC SUPPLY FROM RECHARGEABLE BATTERY een 28 FIGURE 18 SEIKO XH414H IV01E CHARGE DISCHARGE CHARACTERISTIC ul 01103m nana nnaanaanaswsawaawaswsawaasasuws sauna 28 FIGURE 19 CONNECTION OF THE SERIAL INTERFACES Aa 29 FIGURE 20 CONNECTION OF RXD AND TXD ONLY 000 0 a aaa 29 FIGURE 21 CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING vrvrervrnvrrevnvevnvevnvenvvenerrvernvernvesner 30 FIGURE 22 SPEAKER REFERENCE CIRCUIT ul Uro nana 31 FIGURE 23 SPEAKER WITH AMPLIFIER REFERENCE CIRCUIT sasawa enauwsunaeswanesausnssnconsanasssunwasnana 31 FIGURE 24 MICROPHONE REFERENCE CIRCUIT Yine ee a ead eE 32 FIGURE 25 EARPHONE REFERENCE CIRCUIT Wy rronroorronnnvnvennvenrrervevrnvrrevrrnvnnsvnnsannsnnnennenvnevvrevrevvnenrnenrevrensunnsennnene 32 FIGURE 26 REFERENCE CIRCUIT OF THE 8 PIN SIM CARD HOLDER AA 33 FIGURE 27 REFERENCE CIRCUIT OF THE 6 PIN SIM CARD HOLDER A 34 FIGURE 28 AMPHENOL C707 10M006 5122 SIM CARD HOLDER 34 FIGURE 29 MOLEX 91228 SIM CARD HOLDER AAA 35 FIGURE 30 REFERENCE CIRCUIT OF THE KEYPAD INTERFACE 36 FIGURE 31 RI BEHAVIOUR OF VOICE CALLING AS ARECEIWNER A 37 FIGURE 32 RI BEHAVIOUR OF DATA CALLING AS A RECEIVER rirvrvrorvrrvrrrervrrrvervrrvarvesverservresenrvesvarvesvasvesvreseene 38 FIGURE 33 RFBEHAVIOUR OF URC OR RECEIVE SMS i rvrvrsvervnvvrrververrarververservrervesvesvervesvessesverversesvrerersverrasveeeene 38 FIGURE 34 RI BEHAVIOUR AS A CALLER cece cscs cee saaan kaaa 38 FIGURE 35 REFERENCE CIRCUIT OF NETLIG
29. HT A 39 FIGURE 3Q RESET TIMING E 39 FIGURE 37 RESET REFERENCE DESIGN CIRCUIT oo ce eecceeecssecnecesecesecaecaeecaeecaeseaeseaeseeeseeeeseesaeeaessaeeeneeees 40 FIGURE 38 THE RF INTERFACE OF MODUL 41 FIGURE 39 GSM ANTENNA MATCHING CIRCUIT 200 ececeecseecceseceseceeceseceaecaecaecaeecaeseaesseeseeeseeesaeesaeenaessaeeeneeees 41 FIGURE 40 INTERNAL SUPPLY ANTENNA BIAS VOLTAGE evvrvvrvvnvvrvrarvesversersververvrsvarvesvarvarvesvarvessrerensvesvarvesvernr 44 FIGURE 41 EXTERNAL SUPPLY ANTENNA BIAS VOLL IAOE eeceeccesecnsecssecnsesacecaeesaessaecaeeeaeeeneseeeseneseeenas 44 FIGURE 42 GNSS ANTENNA MATCHING CIRCUIT aaa 46 FIGURE 43 OPEN CIRCUIR DETECTION A c sccossessssesessoscossessconseessesessvasoensbevasoebsveessessesnsensossossussoonsoassessvevcesssonces 48 FIGURE 44 OPEN CIRCUIR DETECTION B wivccsssvsnsscosncescostvsessconvecteotcnsees GIKAN AIDA KNA ANA 48 FIGURE 45 MODULE LABEL INFORMATION 55 SIM968_Hardware Design_V1 00 2013 02 25 fom o n o pang Peres SS o GI ai gt Smart Machine Smart Decision 1 Introduction This document describes SIM968 hardware interface in great detail This document can help user to quickly understand SIM968 interface specifications electrical and mechanical details With the help of this document and other SIM968 application notes user guide users can use SIM968 to design various applications quickly 2 SIM968 Overview Designed for global mark
30. I HIGH Establish the call Hang up the call Idle Ring Figure 31 RI behaviour of voice calling as a receiver SIM968_Hardware Design_V1 00 37 2013 02 25 Smart Machine Smart Decision RI HIGH Establish the call Hang up the call Idle Ring Figure 32 RI behaviour of data calling as a receiver HeH H 120ms LOW gt G25 2220 Le eG Idle Receive SMS URC Figure 33 RI behaviour of URC or receive SMS However if the module is used as caller the RI will remain high Please refer to the following figure HIGH RI Idle Ring Establish Hang up Idle the call the call Figure 34 RI behaviour as a caller 4 13 Network Status Indication The NETLIGHT pin can be used to drive a network status indication LED The status of this pin is listed in following table Table 17 Status of the NETLIGHT pin Off SIM968 is not running 64ms On 800ms Off SIM968 not registered the network 64ms On 3000ms Off SIM968 registered to the network 64ms On 300ms Off PPP GPRS communication is established A reference circuit is recommended in the following figure SIM968_Hardware Design_V1 00 38 2013 02 25 Smart Machine Smart Decision MODULE VBAT NETLIGHT o 47K Figure 35 Reference circuit of NETLIGHT 4 14 General Purpose Input Output GPIO SIM968 provides up to 6 GPIO pins The output voltage level of the GPIO can be set by the AT command
31. IM VDD SIM card power supply C2 SIM RST SIM card reset C3 SIM CLK SIM card clock C4 GND Connect to GND C5 GND Connect to GND C6 VPP Not connect SIM968 Hardware Design V1 00 35 2013 02 25 C7 SIM DATA C8 SIM PRESENCE SIM card data I O Detect SIM card presence 4 9 LCD Display SPI Interface Smart Machine Smart Decision SIM968 provides a serial LCD display interface It could also be used as SPI interface in the embedded AT application For details about embedded AT application please refer to document 7 Note This function is not supported in the standard firmware If user wants this function the firmware must be customized Please contact SIMCom for more details 4 10 Keypad Interface The keypad interface consists of 3 keypad column outputs and 3 keypad row inputs The bastc configuration is 3 keypad columns and 3 keypad rows total 9 keys Table 14 Pin definition of the keypad interface Pin name GPIO1 KBRO GPIO2 KBR1 GPIO3 KBR2 GPIO4 KBCO GPIO5 KBC1 GPIO6 KBC2 The keypad interface allows a direct external matrix connection A typical recommended circuit of the keypad is Pin number 31 32 33 34 35 36 shown in the following figure Note This function is not supported in the standard firmware If user wants this function the firmware must be customized Default function GPIO1 GPIO2 GPIO3 GPIO4 GPIOS GPIO6 Second function Keypad matrix
32. IONAL DIAGRAM reruvervvrvvrrvnrvrrvervvsversenversververrarvesvarservrerensvesvavvnsvarvnsvsrvensvenvavvesvasvesvsssnnn 12 FIGURE 2 SIM968 PIN OUT DIAGRAM TOP VIEW ulanan naaa nananaksak 13 FIGURE 3 DIMENSIONS OF SIM968 CUNIT MM unmmmmasacacncnononanananawawawawawasnanananawanawawasawasasasasaananananananananasasasnonononon 16 FIGURE 4 RECOMMENDED PCB FOOTPRINT OUTLINE CUNIT MM errvrvrvrrvnrsereresrsnererererererevevevevevsvsvsesesesen 17 FIGURE 5 REFERENCE CIRCUIT OF THE LDO POWER SUPPLY AAA 18 FIGURE 6 REFERENCE CIRCUIT OF THE DC DC POWER SUPPLY 32 naa naaana nanana cece cneeesesseceseeceessesecseeeeneees 18 FIGURE 7 VBAT VOLTAGE DROP DURING TRANSMIT BURST cece ceeeeeeeeeeeeeeeeeeeceseceaecnaecaeceesaeeeneeees 19 FIGURE 8 THE MINIMAL VBAT VOLTAGE REQUIREMENT AT VBAT DROP rsvirvrvrervrrverervrrrervvrrvarvesversesvrereene 19 FIGURE 9 POWERED ON DOWN MODULE USING TRANSISTOR rvvrvorvrvvnvevnvvrnvevverrenernersenerversensrnersersrnersensenenee 19 FIGURE 10 POWERED ON DOWN MODULE USING BUTTON EE 20 FIGURE 11 TIMING OF POWER ON MODULE ENEE 20 FIGURE 12 TIMING OF POWER DOWN SIM968 BY PWRKEY AEN 21 FIGURE 13 TIMING OF RESTART SIM968 ul mmususansnna nananana anas ananasanaana sana sasnasaranasanosna sna n a ae i i La 22 FIGURE 14 SIM968 WITH BATTERY CHARGER AND PACK CONNECTION 24 FIGURE 15 RUC SUPPLY FROM CAPACITOR apan na NING LG NINGNIGNAGURANA DADANG DINDI an 28 FIGURE 16 RTC SUPPLY FROM NON CHARGEABLE BATTERY ula Meseres aa 28
33. M968 will continuously monitor the serial port data signal When there is no data transfer over 5 seconds on the RXD signal and there is no on air and hardware interrupts such as GPIO interrupt SIM968 will enter sleep mode 2 automatically In this mode SIM968 can still receive paging or SMS from network but the serial port is not accessible Note For SIM968 It is requested to set AT command AT CSCLK 2 to enable the sleep mode 2 the default value is 0 which can not make the module to enter sleep mode For more details please refer to document 1 4 3 5 Wake Up SIM968 from Sleep Mode 2 AT CSCLK 2 When SIM968 is in sleep mode 2 AT CSCLK 2 the following methods can wake up the module Send data to SIM968 via main serial port e Receive a voice or data call from network e Receive a SMS from network Note The first byte of the user s data mill not be recognized 4 4 Charging Interface SIM968 has integrated a charging circuitinside the module for Li Ion batteries charging control which make it very convenient for user s applications that support battery charging A common connection is shown in the following figure SV Ss Vpar Module Battery Pack TEMP BAT Rremp as Thermistor Figure 14 SIM968 with battery charger and pack connection Battery temperature measurement is a customization function which is supported by the software in the module In above figure the Rremp is a
34. NT GND GPS VANT OUT GPS VANT IN AADET N MODULE Figure 44 Open circuir detection B If the antenna supply voltage is not derived from GPS VANT OUT do not exceed the maximum voltage rating of AADET N 5V SIM968 Hardvare Design V1 00 48 2013 02 25 Zeiten Smart Machine Smart Decision 6 Electrical Reliability and Radio Characteristics 6 1 Absolute Maximum Ratings The absolute maximum ratings stated in following table are stress ratings under non operating conditions Stresses beyond any of these limits will cause permanent damage to SIM968 Table 20 Absolute maximum ratings of GSM VBAT GSM Power supply voltage V Na Input voltage 0 3 3 1 V E Input current 10 mA lo Output current 10 mA These parameters are for digital interface pins such as keypad GPIO PC UART LCD PWMs and DEBUG Table 21 Absolute maximum ratings of GNSS GPS VCC GNSS Power supply voltage V GPS VANT IN GNSS active antenna power E 5 5V SS V supply GPS ANT GNSS radio antenna connection 3 08 V V BACKUP Power supply for GNSS RTC 4 6 V Ir T O pin voltage 3 6 V 6 2 Recommended Operating Conditions Table 22 Recommended operating conditions VBAT Power supply voltage 4 0 4 8 V GPS VCC GNSS Power supply voltage 2 8 3 3 4 3 V V_BACKUP Power supply for GNSS RTC 2 2 8 4 6 V TopER Operating temperature 40 25 85 C TsrG Storage temperature 45 90 C Note Operation in the temperature range 40 C 30 C is
35. PMTK command input The receiver GPS RXD and transmitter GPS TXD side of every port contains a 16 byte FIFO and has 256 bytes URAM The baud rates are selectable and ranging from 4 8 to 921 6kbps through CoreBuilder tool UART can provide the developers signal or message outputs UARTI I is as RTCM input For details about CoreBuilder information please refer to document 21 5 3 1PPS Output The 1PPS pin outputs pulse per second 1PPS pulse signal for precise timing purposes It will come out after successfully positioning The 1PPS signal can be provided through designated output pin for many external applications 5 4 A GPS A GPS is the meaning of Assisted GPS which is a system that can improve the startup performance and time to first fix TTFF of a GPS satellite based positioning under certain conditions SIM928 module supports EPO file and SBAS RTCM 5 41 EPO The SIM968 supports the EPO Extended Prediction Orbit data service The EPO data service is supporting 7 14 30 day orbit predictions to customers It needs occasional download from EPO server Supply of aiding information like ephemeris almanac rough last position and time and satellite status and an optional time synchronization signal will reduce time to first fix significantly and improve the acquisition sensitivity SIM968 Hardware Design V1 00 44 2013 02 25 Smart Machine Smart Decision The user should update the EPO files from the EPO server daily t
36. SM Phase 2 2 Class 4 2W at GSM 850 and EGSM 900 Class 1 1W at DCS 1800 and PCS 1900 GPRS multi slot class 10 default GPRS multi slot class 8 option Normal operation 30 C 80 C Restricted operation 40 C 30 C and 80 C 85 C Storage temperature 45 C 90 C GPRS data downlink transfer max 85 6 kbps GPRS data uplink transfer max 42 8 kbps Coding scheme CS 1 CS 2 CS 3 and CS 4 Integrate the TCP IP protocol Support Packet Broadcast Control Channel PBCCH Support CSD transmission Unstructured Supplementary Services Data USSD support MT MO CB Text and PDU mode SMS storage SIM card Group 3 Class 1 Support SIM card 1 8V 3V Antenna pad Speech codec modes Half Rate ETS 06 20 Full Rate ETS 06 10 Enhanced Full Rate ETS 06 50 06 60 06 80 Adaptive multi rate AMR Echo Cancellation Noise Suppression Serial port Full modem interface vvith status and control lines unbalanced asynchronous 9 2013 02 25 Smart Machine Smart Decision 1200bps to 115200bps Can be used for AT commands or data stream Support RTS CTS hardware handshake and software ON OFF flow control Multiplex ability according to GSM 07 10 Multiplexer Protocol Autobauding supports baud rate from 1200 bps to 57600bps Debug port e Null modem interface DBG TXD and DBG RXD e Can be used for debugging and upgrading firmware Support phonebook types SM FD LD RC ON MC Phonebook
37. abel information Table 35 illustration of module label A Logo of SIMCom Module name Module part number Hardware number and software number included ex S2 105E0 is hardware number 0901 is software number D Module serial number and bar code E Module IMEI and bar code F CE authenticated logo SIM968_Hardware Design_V1 00 55 2013 02 25 Sec Ge Ges Ges Bi company of SIM Te Appendix A Related Documents Table 36 Related documents SN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Document name SIM908 AT Command Manual AN SIM900 TCPIP SIM900 Multiplexer User Manual Application Note AN SIM900 Series Update Tool UGD AN SIM900 AUDIO AN SIM900 Audio LINE IN input SIM900 Embedded AT Application Note AN Serial Port AN_SIM900 TE PCB Layout amp Schematic for Reference Module secondary SMT UGD ITU T Draft recommendation V 25ter GSM 07 07 new GSM 07 10 GSM 07 05 GSM 11 14 GSM 11 11 GSM 03 38 GSM 11 10 SIM28 68R 68V SIM968 Hardware Design V1 00 Smart Machine Smart Decision Remark SIM908 AT Command Manual TCP IP Applications User Manual SIM968 Multiplexer User Manual Application Note SIM968 Series Update Tool User Guide Applications Note About SIM968 Audio Applications Note About SIM968 LINE IN Input SIM968 Embedded AT Application Note App
38. ation cccceessecssecsseecssceeesseeceseecsscecsneeseceecsseeessecsaeecsaceeseceessaeeseaeecsnesseeecessaeees 38 4 14 General Purpose Input Output CGPIO 39 4 15 External Reset ccccccccccsssecssecsseeeseneeesseecsseeensneessaeessseecneeceseecnnecseneessaeeenseessaeeeuececeeaeessaeeenseeseeaeesseaeees 39 416 PM uses 40 AE ER cctateteaasetbeaaseceas testa aatctacwleecaacsdetiy octancaarstcrecsseeseaacadeceaesccomsucdeteascieusaaeitetahecteseateasseicdomaaee 40 4 18 GSM Antenna Interface sicccsicsssicsicsicsscesicesicevicensessievicevecevicavsiesicesscesicanviesicevicesicassiessccesievicesicestcene 40 5 GNSS Application Interface reseseessevsnevnneenneennennnevnnennnennnennnennnennnennnennnnennennnnennnnnnennnnennnennnennnennsenkasseseennenesee 42 5 1 Power Management Jake Saale ed eiker Mnd keg WEE EE 42 S L GNSS Power e EEN WEE E 42 5 1 2 Starting GNSS Engine Rgs Namn Aka 42 5 1 3 Verification of GNSS Engine Start pa 42 514 Bower Savine Modes ala EE 42 5 155 Operating EE Mags NGA nbang 42 5 16 GPS VANT OUT and GPS VANT IN ua na a Ka 43 5 2 UE DREEM 44 5 3 IPRS RU E E WEE 44 5 4 EE EE o Ne DEET 44 54 1 od OJ SA NAA 44 542 EASY MODE AA e Ch NA AA 45 54 3 SBAS and RTCM sansene Je 45 5 5 GNSS Antenna Interface Lee gi Arre orere airain a Erara a Erin E E aE E E E denna 45 5 5 1 GNSS Antenna Interface ceeee e 45 5 5 2 GNSS Antenna Choice Consideration cccceccescesceeseeseeseeseeeeeeseesecsecs
39. breve Smart Machine Smart Decision Table 12 Pin description Amphenol SIM card holder C1 SIM VDD SIM card power supply e2 SIM RST SIM card reset C3 SIM CLK SIM card clock C5 GND Connect to GND C6 VPP Not connect C7 SIM DATA SIM card data I O For 8 pins SIM card holder SIMCom recommends to use Molex 91228 User can visit http www molex com for more information about the holder 2 3X 1 4 XB 2 54 PITCH RECOMMENDED PCB LAYOUT 2 1 NOTES I SEE PRODUCT SPECIFICATION PS 99020 007 I 2 PACKING TAPE AND REEL FOR DETAIL SEE SDA 91228 9001 SHT 3 PUSH ROD LEVER MUST NOT PROTRUDE BEYOND HOUSING Le IN THIS AREA 4 TAILS ON EACH SIDE OF CONNECTOR TO LIE WITHIN O 12mm Si EACH OTHER COMPONENT MATERIAL HOUSING LIQUID CRYSTAL POLYMER LCP 30 GLASS FILL UL94 V 0 COLOUR BLACK Vi TERMINAL 0 15 PHOSPHOR BRONZE O lum MIN Au OVER Pani A CONTACT AREA 2 5um MIN Sn ON SMT TAILS WW PUSH BUTTON GF NYLON 46 YELLOW X COIL SPRING 0 25 STAINLESS STEEL PUSH ROD 0 4 STAINLESS STEEL LAY LEVER _ 0 4 STAINLESS STEEL EAC TENNENE NE TET ANGLE PROTECTION REVISE ONLY ON CAD SYSTEM Leena vm Pero pen TEN DDE P emma DEGVATXN TET D PREPNEM NA ESE L BMAD PET OE EK MRI ET ARAMIN 2 TYP CONT HEIGH L9 woo TO TABLE 03 10 24 FO REVISIONS E SIM PCB CONNECTOR GE SINE ee IT sa Figure 29 Molex 91228 SIM card holder Table 13 Pin description Molex SIM card holder S
40. chronization between DTE and DCE When DCE powers on with autobauding enabled user must firstly send character A to synchronize the baud rate It is recommended to send AT until DTE receives the OK response which means DTE and DCE are correctly synchronized For more information please refer to the AT command AT IPR e Restrictions of autobauding operation The DTE serial port must be set at 8 data bits no parity and 1 stop bit The URC such as RDY CFUN 1 and CPIN READY will not be reported Note User can use AT command AT IPR x to set a fixed baud rate and the setting will be saved to non volatile flash memory automatically After the configuration is set as fixed baud rate the URC such as RDY CFUN and CPIN READY will be reported when SIM968 is powered on Debug port e Used for debugging and upgrading firmware Debug port supports the baud rate of 115200bps for debugging and 460800bps for upgrading firmware 4 6 2 Software Upgrade and Debug Refer to the following figure for debugging and upgrading software MODULE RS232 PC DBG_TXD O TXD IN TXD_OUT O RXD DBG RXYD OO Q RxD OUT RXD IN O TXD VBAT C PWRKEY GND Figure 21 Connection for software upgrading and debugging The serial port and the debug port support the CMOS level If user connects the modul
41. design of 5V input power supply The designed output for the power supply is 4 1V thus a linear regulator can be used DC INPUT U101 MIC29302 FB101 VBAT 270 OHM C101 100uF TN C103 C104 mn 330uF 100nF Figure 5 Reference circuit of the LDO power supply If there is a high drop out between the input and the desired output VBAT a DC DC power supply will be preferable because of its better efficiency especially with the 2A peak current in burst mode of the module The following figure is the reference circuit DC input U101 LM2596 ADJ FUSE L101 FB101 VBAT no o e 1 Vin Vout H ON A 5 100uH 270 OHM ON TVS101 cor Q102 LOAN z FB D102 c103 C104 RIOT SMBJ15A 100uF TUF 330uF TD 7 1100nE R PWR CTRL 3 nk z ale MBR360 R102 Figure 6 Reference circuit of the DC DC power supply The single 3 7V Li ion cell battery can be connected to SIM968 VBAT pins directly But the Ni Cd or Ni MH battery must be used carefully since their maximum voltage can rise over the absolute maximum voltage of the module and damage it When battery is used the total impedance between battery and VBAT pins should be less than 150mQ The following figure shows the VBAT voltage drop at the maximum power transmit phase and the test condition is as following VBAT 4 0V A VBAT bypass capacitor CA 100uF tan
42. e 5 Pin description SIM968 Hardware Design V1 00 13 2013 02 25 93 cooo DE Smart Machine Smart Decision yo S VBAT 62 63 I GSM power supply 3 2V 4 8V It is recommended to VRTC 42 I O Power supply for GSM RTC connect with a battery or a capacitor e g 4 7uF VDD EXT 44 O 2 8V output power supply If it is unused keep open GPS VCC 2 I GNSS Power supply 2 8V 4 3V It is recommended to V BACRUP 13 I Power supply for GNSS RTC connect with a battery or LDO GPS VANT OUT 75 O 2 8V output for GNSS active antenna If it is unused keep open GPS_VANT_IN 76 I GNSS active antenna power supply If it is unused keep open 1 2 5 10 14 37 40 41 43 57 58 GND Ground 60 61 64 65 77 78 80 VCHG 74 I Charger input TEMP BAT 73 I Battery temperature sensor PWRKEY should be pulled low at PWRKEY 3 I least I second and then released to Pulled up internally power on down the module MICIP 23 I Differential audio input MICIN 24 SPKIP 22 R S O Differential audio output SPKIN 21 If these pins are unused MIC2P 27 I i H keep open I Differential audio input MIC2N 28 SPR2N 25 O Differential audio output SPK2P 26 STATUS 52 O Power on status If these pins are unused NETLIGHT 51 O Network status keep open Time Mark ts timin Ise 1PPS 11 F per AE If unused keep open related to receiver time DISP CLK 6 O Display interface If these pins are unused DISP DATA 7 I O keep open SIM968 Hardware Design V1 00 14 2013 02
43. e to the computer the level shifter should be added between the DCE and DTE For details about software upgrading please refer to document 4 SIM968 Hardware Design V1 00 30 2013 02 25 Smart Machine Smart Decision 4 7 Audio Interfaces SIM968 provides two analog inputs MICIP IN and MIC2P 2N which could be used for electret microphone The module also provides two analog outputs SPK1P 1N and SPK2P 2N The output can directly drive 32Q receiver AT command AT CMIC is used to adjust the input gain level of microphone AT command AT SIDET is used to set the side tone level In addition AT command AT CLVL is used to adjust the output gain level For more details please refer to document 1 and document 5 In order to improve audio performance the following reference circuits are recommended The audio signals have to be layout according to differential signal layout rules as shown in following figures If user needs to use an amplifier circuit for audio National Semiconductor Company s LM4890 is recommended 4 7 1 Speaker Interface Configuration 7 These components should be placed to speaker as close as possible The lines in bold type should be accorded to differential i ESD signal layout rules 10pF 33pF ANTI MODULE 10pF 33pF i SPKIN i H i I These components should be
44. eeseesecseeeeeaeeaeseseeeeaeeaeenseeaeeas 46 5 5 3 Active antenna sUupetVikOr Nik EBE 47 6 Electrical Reliability and Radio Characteristics sccsccssscssscssscssscssscssccssscssscsssesscesssescsenssesssenesencees 49 6 1 Absolute Maximum Range 49 6 2 Recommended Operating Conduons as sas N NN NN 49 6 3 Digital Infterfacakharacteristics saanman 49 6 4 SIM Card Interface Characteristics c ccccssccssecsseeceseeeseseeesseecsseecnseecseeeseneeeeseessaeeenueceeaeeseaeeeneessaaees 50 6 5 VDD EXT Characteristics ceccescesccesecssecesecesecesecesecesecececcecceccecececsceceaeccecceceeceeecseceeecseeeseeeeaeaes 50 6 6 SIM NZD D CharacieriStI ES NAAN NBA ak BRIAN A 51 6 7 Kat ege 51 6 8 Current Consumption VBAT 3 8V u s 51 6 9 Electro Static Discharge 0110101700 nA Enna 52 6 10 Radio Characteristic S kan AG GA ee LA aska 53 6 10 1 Module RF Output POWER tits knes ene 53 6 10 2 Module RF Receive Sensitivity 000200000maasana 0 NEA 54 6 10 3 Module Operating Freouenches asana AGNES 54 6 11 Module label information soc c ccccccscccseeccesesceseccedeceeessecereceedquecstenstscuedqcuacotecsasecsdnecacseesseseasdnassedeeestaeseced 55 APPENTIX 000101004000034004X004034000 NGUOI 56 A Related RR TE E 56 B Terms nd A bbrevIau ee e atents e GAN 57 SIM968 Hardvare Design V1 00 4 2013 02 25 Smart Machine Smart Decision EEE EE 58 Table Index TABLE 1 SIM968 GSM GPRS
45. er state non volatile RTC and backup RAM block is powered on Other internal blocks like digital baseband and RF ar internally powered off The power supply input GPS VCC shall be kept active all the time even during sleep mode Entering into sleep mode is sent PMTK command through the communication interface by host side The GNSS engine can be waked up from sleep mode by sent any byte through the communication interface 5 1 6 GPS VANT OUT and GPS VANT IN GPS VANT OUT is a 2 8V output for active external antenna if the active external antenna works at 2 8V voltage supply domain user can connect the GPS VANT OUT and GPS VANT IN through a resistor for example 10ohm in the following picture If the antenna s power is not 2 8V a proper voltage should be provided to the pin GPS VANT IN through a resistor for example 100hm and the pin GPS VANT OUT should be kept open in the following picture For passive antennas both the pin GPS VANT OUT and the pin GPS VANT IN should be kept open GPS VANT IN Active Antenna SIM968 SIM968 Hardware Design V1 00 43 2013 02 25 Smart Machine Smart Decision Figure 40 Internal supply Antenna bias voltage External Voltage Supply Active Antenna GPS_VANT_IN R BIAS1 GPS VANT OUT SIM968 Figure 41 External supply Antenna bias voltage 5 2 UART Interface SIM968 GNSS engine includes two UARTS UART and UART I interface for serial communication The UART is as NMEA output and
46. ernal biasing DC Characteristics DES V SIM968 Hardware Design V1 00 32 2013 02 25 Smart Machine Smart Decision Differential input THD lt 1 at F 1KHz 15 9 mVrms voltage pre amp gain 20 dB PGA gain 14 dB THD lt 5 at F 1 KHz 740 mVrms pre amp gain 0 dB PGA gain 0 dB Table 11 Audio output characteristics Parameter Conditions Min Typ Max Unit RL 320Q 91 mW THD 0 1 RL 32Q 96 mw Normal THD 1 Output SPK Output swing voltage i 1 1 Vpp single ended Output svving voltage 22 Vv differential La 4 8 SIM Card Interface 4 8 1 SIM Card Application The SIM interface complies with the GSM Phase I specification and the new GSM Phase 2 specification for FAST 64 kbps SIM card Both 1 8V and 3 0V SIM card are supported The SIM interface is powered from an internal regulator in the module It is recommended to use an ESD protection component such as ST www st com ESDA6V1W5 or ON SEMI www onsemi com SMF05C The pull up resistor 15KQ on the SIM DATA line is already added in the module internal Note that the SIM peripheral circuit should be close to the SIM card socket The reference circuit of the 8 pin SIM card holderisillustrated in the following figure VDD EXT 7 10K 100nP TZ MOLEX 91228 SIM VDD oo SIM RST DOR Mos ayp C MODULE S G om CLK vo z S H e PRESENCE GND 4 SIM DATA 22R
47. esenessestesceesssenecnensestesseeensenesseseeessensneeness 23 4 3 3 Wake Up SIM968 from Sleep Mode 1 AT CSCLK 1 ul 23 4 3 4 Sleep Mode 2 AT CSCLEK 2 0 nasaan NANANA NANANA 24 4 3 5 Wake Up SIM968 from Sleep Mode 2 AT CSCLK 2 rrnrvrrrnvnrenvvrrnrversnvvrervvrennnrssnversnversnsnrennrssnnne 24 4 4 Charging NIN EE 24 4 4 1 Battery Back Characteristtcs nA EE ENE a 25 4 42 Recommended Battery Pack 25 4 4 3 Amplemented Charging Technique AE ENE ENE aaa 25 4 4 4 Operating Modes during Chargmg 000 NN NA 26 4 45 Charger Requirements 00102000000 00000 NAG EE SESE AA 27 4 5 NEBE 27 4 6 EE sa 29 4 6 1 Function of Serial Port and Debug Port 29 4 6 2 Software Upgrade and Debug 0000 AETA 30 4 7 AUDIO e e 31 4 7 1 Speaker Interface Configuration sessista e a RE EAN AEAN ANR 31 4 7 2 Microphone Interfaces Configuration 004 32 4 7 3 Earphone Interface Configuration AE AA 32 4 74 Audio Electronic Characterist1cs srronrnonrnonvnenrnenrnenrnenrnenrnenrnenrnenrnenrnennnenrnenrnenrnenresnnsnnnennrnennnsnsnennee 32 4 8 SIM Card e 33 481 SIM Card AppICa on EE 33 SIM968 Hardvare Design V1 00 3 2013 02 25 Mi Smart Machine Smart Decision 4 8 2 Design Considerations for SIM Card Holder 111101717770717 34 4 9 ECD Display SPLINE aC E am titat En 36 4 10 Keypad Interface ueaiiaii iii ssmiisamaiaimamasmiasmssmai tasassmi iasasmsasasai n 36 21 DC ma meses Na a aNG 37 4 12 RESBEMAVIOLS ric a aa a 37 4 13 Network Status Indic
48. et SIM968 is integrated with a high performance GSM GPRS engine and a GNSS engine They are independent with each other The GSM GPRS engine is a quad band GSM GPRS module that works on frequencies GSM 850MHz EGSM 900MHz DCS 1800MHz and PCS 1900MHz SIM968 features GPRS multi slot class 10 class 8 optional and supports the GPRS coding schemes CS 1 CS 2 CS 3 and CS 4 The GNSS solution offers best in class acquisition and tracing sensitivity Time To First Fix TTFF and accuracy With built in LNA SIM968 doesn t need external LNA SIM968 can track as low as 167dBm signal even without network assistance The SIM968 has excellent low power consumption characteristic acquisition 34mA tracking 37mA SIM968 supports various location and navigation applications including autonomous GPS GLONASS GALILEO QZSS SBAS WAAS EGNOS GAGANy MSAS DGPS RTCM and A GPS With a tiny configuration of 30 30 3mm SIM968 Can meet almost all the space requirements in user applications such as M2M smart phone PDA tracker and other mobile devices SIM968 has 80 SMT pads and provides all hardware interfaces between the module and customers boards Serial port and debug port can help user develop their applications easily GNSS Serial port Audio channels include two inputs and two outputs These can be easily configured by AT command Charging interface Programmable general purpose input and output The keypad and SPI display interfaces w
49. f the voltage lt 3 3V the following URC will be reported UNDER VOLTAGE WARNNING If the voltage gt 4 7V the following URC will be reported OVER VOLTAGE WARNNING If the voltage lt 3 2V the following URC will be reported and the module will be automatically powered down UNDER VOLTAGE POWER DOWN If the voltage gt 4 8V the following URC will be reported and the module will be automatically powered down OVER VOLTAGE POWER DOWN At this moment AT commands can not be executed any more and only the RTC is still active Power down mode can also be indicated by STATUS pin which is at low level at this time 4 2 2 4 Over temperature or Under temperature Power down The module will constantly monitor the temperature of the module If the temperature gt 80 C the following URC will be reported CMTE 1 If the temperature lt 30 C the following URC will be reported CMTE 1 If the temperature gt 85 C the following URC will be reported and the module will be automatically powered down CMTE 2 If the temperature lt 40 C the following URCAvill be reported and the module will be automatically powered down CMTE 2 At this moment AT commands can not be executed any more and only the RTC is still active Power down mode can also be indicated by STATUS pin which is at low level at this time The AT command AT CMTE could be used to read the temperature when the module is running For details please refer to
50. hrough the internet Then the EPO data should send to the SIM968 by the HOST side SIM68R has the short cold TTFF and warm TTFF when the A GPS is used Note For more information about EPO please contact SIMCom sales users can refer to document 20 for more information 5 42 EASY MODE EASY is the abbreviation of Embedded Assist System it works as embedded firmware which accelerates TTFF by predicting satellite navigation messages from received ephemeris No additional computing interval for EASY task EASY is efficiently scheduled and computed in free time of every second after GNSS navigation solution EASY function is conceptually designed to automatically engage for predicting after first receiving the broadcast ephemeris After a while generally tens of seconds 3 day extensions will be completely generated then all EASY functions will be maintained at a sleep condition EASY assistance is going to be engaged when the GNSS requests in new TTFF condition or re generates again with another new received ephemeris Meanwhile TTFF will be benefited by EASY assistance Note EASY function is default open and can be closed by PMTK command 5 43 SBAS and RTCM SBAS is the abbreviation of Satellite Based Augmentation System The SBAS concept is based on the transmission of differential corrections and integrity messages for navigation satellites that are within sight of a network of reference stations deployed across ap entire continent
51. ill bring users convenience to develop customized applications RF pad interface Output navigation solution in NMEA protocol format Supports FCC E911 compliance and A GPS 33tracking 99 acquisition channel GNSS receiver Accuracy lt 2 5m CEP RoHS compliant Active antenna supervisor SIM968 is designed with power saving technique so that the current consumption is as low as 1 2mA in sleep mode GNSS engine is powered down SIM968 integrates TCP IP protocol and extended TCP IP AT commands which are very useful for data transfer applications For details about TCP IP applications please refer to document 2 SIM968_Hardware Design_V1 00 8 2013 02 25 2 1 SIM968 Key Features Smart Machine Smart Decision Table 1 SIM968 GSM GPRS engine key features Feature Power supply Power saving Charging Frequency bands Transmitting power GPRS connectivity Temperature range Data GPRS CSD USSD SMS FAX SIM interface External antenna Audio features Serial port and debug port SIM968_Hardware Design_V1 00 Implementation 3 2V 4 8V Typical power consumption in sleep mode is 1 2mA BS PA MFRMS 9 GNSS engine is powered down Supports charging control for Li Ion battery SIM968 Quad band GSM 850 EGSM 900 DCS 1800 PCS 1900 SIM968 can search the 4 frequency bands automatically The frequency bands also can be set by AT command AT CBAND For details please refer to document 1 Compliant to G
52. ine Smart Decision SIM968 Hardware Design V1 00 59 2013 02 25 Sec Ge Ges Ges Bi een Acompany Smart Machine Smart Decision Contact us Shanghai SIMCom Wireless Solutions Ltd Add SIM Technology Building No 633 Jinzhong Road Changning District Shanghai P R China 200335 Tel 86 21 3252 3300 Fax 86 21 3252 3301 URL www sim com wm SIM968 Hardware Design V1 00 60 2013 02 25
53. ironment and motion conditions SIM968 can adaptive adjust the on off time to achieve balance of positioning accuracy and power consumption Note the modes mentioned above are operated by PMTK commands users can refer to document 19 for more information SIM968 provides very low leakage battery back up memory which contains all the necessary GNSS information for quick start up and a small amount of user configuration variables It needs a 3V power supply for V BACKUP pin and the stable operation region ranges from very light load to about 3mA 5 1 5 Operating Mode Table 19 Power supply and clock state according to operation mode SIM968 Hardware Design V1 00 42 2013 02 25 a ann Smart Machine Smart Decision Mode GPS VCC V BACKUP Internal LDO Main clock RTC clock Full on on On on on on Sleep on On on off on Backup on On off off on 5 1 5 1 Full on Mode The module will enter full on mode after first power up with factory configuration settings Power consumption will vary depending on the amount of satellite acquisitions and number of satellites in track This mode is also referenced as Full on Full Power or Navigation mode Navigation is available and any configuration settings are valid as long as the GPS VCC power supply is active When the power supply is off settings are reset to factory configuration and receiver performs a cold start on next power up 5 1 52 Sleep Mode Sleep mode means a low quiescent 44QuA type pow
54. lication Note About Serial Port Application Note About SIM968 TE PCB Layout amp Schematic Module secondary SMT User Guide Serial asynchronous automatic dialing and control Digital cellular telecommunications Phase 2 AT command set for GSM Mobile Equipment ME Support GSM 07 10 multiplexing protocol Digital cellular telecommunications Phase 2 Use of Data Terminal Equipment Data Circuit terminating Equipment DTE DCE interface for Short Message Service SMS and Cell Broadcast Service CBS Digital cellular telecommunications system Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity Module Mobile Equipment SIM ME interface Digital cellular telecommunications system Phase 2 Specification of the Subscriber Identity Module Mobile Equipment SIM ME interface Digital cellular telecommunications system Phase 24 Alphabets and language specific information Mobile Station Part 1 Conformance specification Digital cellular telecommunications system Phase 2 MS conformance specification 56 2013 02 25 Suu Com Smart Machine Smart Decision B Terms and Abbreviations Table 37 Terms and Abbreviations o SIM968 Hardware Design V1 00 2013 02 25 an N Dn E D PE 5 O E 5 o DN E D Lag E o G 2 5 Acompany of SIM Tech C Safety Caution Table 38 Safety caution sa SIM968 Hardware Design V1 00 2013 02 25 Diem Smart Mach
55. lot CS 1 9 05kbps CS 2 13 4kbps CS 3 15 6kbps CS 4 21 4kbps 2 2 Operating Modes 2 timeslot 4 timeslot 18 1kbps 36 2kbps 26 8kbps 53 6kbps 31 2kbps 62 4kbps 42 8kbps 85 6kbps The table below summarizes the various operating modes of SIM968 Table 4 Overview of operating modes Mode Function GSM GPRS SLEEP GSM IDLE Normal GSM operation TALK GPRS STANDBY GPRS DATA SIM968 Hardware Design V1 00 Module will automatically go into sleep mode if the conditions of sleep mode are enabling and there is no on air and no hardware interrupt such as GPIO interrupt or data on serial port In this case the current consumption of module will reduce to the minimal level In sleep mode the module can still receive paging message and SMS Software is active Module registered to the GSM network and the module is ready to communicate Connection between two subscribers is in progress In this case the power consumption depends on network settings such as DTX off on FR EFR HR hopping sequences antenna Module is ready for GPRS data transfer but no data is currently sent or received In this case power consumption depends on network settings and GPRS configuration There is GPRS data transfer PPP or TCP or UDP in progress In this case power consumption is related with network settings e g power control level uplink downlink data rates and GPRS configuration e g used multi slot settings 11 2013 02 25
56. management SIM application toolkit GSM 11 14 Release 99 Real time clock Support RTC Kr Size 30 30 3mm Physical characteristics 5 Weight 5 3g Firmware upgrade Firmware upgradeable by debug port k SIM968 does work at this temperature but some radio frequency characteristics may deviate from the GSM specification Table 2 GNSS engine Performance Parameter Description DE sanes Min Type Max Unit Horizontal Position Autonomous lt 2 5 m Accuracy Velocity Without Aid 0 1 m s Accuracy DGPS 0 05 m s Acceleration Without Aid 0 1 m s Accuracy DGPS 0 05 m s Timing Accuracy 10 nS Dynamic Maximum Altitude 18000 m Performance Maximum Velocity 515 m s Maximum 4 G Acceleration Time To First Fix Hot start lt l s Warm start 26 s Cold start 28 s A GPS TTFF EPO Hot start 0 7 s in flash mode Warm start 1 5 s Cold start 1265 s Sensitivity Autonomous 148 dBm acquisition cold start Re acquisition 160 dBm Tracking 167 dBm Receiver Channels 132 Update rate 1 10 Hz Tracking L1 CA SIM968_Hardware Design V1 00 10 2013 02 25 Smart Machine Smart Decision Code Protocol support NMEA PMTK Power Acquisition 34 mA consumption Continuous tracking 37 mA Sleep current 440 uA Backup current 14 uA 1 50 24hr static 130dBm 2 50 at 30m s 3 130 dBm GPS amp GLONASS mode 4 Single Power supply 3 3V under GPS GLONASS signal Table 3 Coding schemes and maximum net data rates over air interface Coding scheme 1 times
57. n an anechoic chamber is a mandatory requirement These ceramic elements vvill need to be located near the end of the ground plane and will require several millimeters of clearance between the closest component It is important to note that use of a LP antenna will result in a minimum of 3dB of gain loss when compared to a RHCP antemna at a defined elevation This is due to the right hand gain rule of antenna propagation Use of PIFA antenna is another LP possibility but the PIFA usually exhibits a considerable amount of gain nulls or holes in the radiation pattern This will be undesirable for obtaining a low circular error probability CEP since the antenna may not allow the receiver to capture the desired satellite at the ideal orientation due to these noted gain nulls Once again careful testing in an appropriate anechoic chamber is required If the customer s design is for automotive applications then an active antenna can be used and located on top of the car in order for guarantee the best signal quality GNSS antenna choice should be based on the designing product and other conditions For detailed Antenna designing consideration please refer to related antenna vendor s design recommendation The antenna vendor will offer further technical support and tune their antenna characteristic to achieve successful GNSS reception performance depending on the customer s design 5 5 3 Active antenna supervisor SIM968 Technology provides
58. n and the battery is connected to the VBAT Pin while SIM968 is in POWER DOWN mode SIM968 will go into the Charge only mode The following table gives the difference between Charge mode and Charge only mode Table 8 Charge operating modes How to activate mode Features Connect charger to module s VCHG Pin GSM remains operational and registers to GSM and connect battery to VBAT Pin of network while charging is in progress module while SIM968 is in Normal e The serial interfaces are available in IDLE TALK operating mode including IDLE TALK mode the AT command set can be used fully in this S mode SLEEP mode etc case 5 In SLEEP mode the serial interfaces are not available Once the serial port is connected and there is data in transferring SIM968 will exit the SLEEP mode SIM968 Hardware Design V1 00 26 2013 02 25 Smart Machine Smart Decision Connect charger to modules VCHG Pin 8 Battery can be charged when GSM engine is not charging when power is down it means KI o S while SIM968 is in POWER DOWN registered to GSM network mode e Only a few AT commands is available as listed o IMPORTANT Here Charge only mode is below pe E Q that not all software tasks are running Note VBAT can not provide more than 5mA current while SIM968 module is during the DDLO charge state In other words it is strongly recommended that VBAT should not be the main power supply in the application subsystem if SIM96
59. n this will give less than desirable results Please note that a RHCP antenna with a gain of 3dBi equates to a linear polarized antenna of OdBi e Proper ground plane sizing is a critical consideration for small GNSS antennas e Proper placement of the GNSS antenna should always be the FIRST consideration in integrating the SIM968 GNSS Module If the customer s design will allow for a ceramic RHCP patch antenna with an appropriately sized ground plane and the patch is normally oriented towards the sky then that particular solution usually works the best Note that if the patch antenna ground plane is less than 60x60mm then compromises to the beam width and gain pattern could result Usually the gain becomes very directional and looses several dB of performance Since results can vary measuring the antenna radiation pattern in the final housing in an appropriate anechoic chamber is required Some customers do not have the size availability to implement a patch antenna approach In that instance use of a Linear Polarized LP antenna is the next best alternative There are new ceramic LP antennas on the market that exhibit reasonable gain characteristics once properly mounted in the housing and when matched to an appropriate sized ground Generally the ground plane requirements are smaller for a LP antenna when compared to a patch SIM968_Hardware Design_V1 00 46 2013 02 25 Smart Machine Smart Decision but once again proper testing i
60. o is illustrated in following figure 5S gt Pulldown 1S Delay gt 1 75 PWRKEY pia AN Input Von lt 0 1V Serial Port Active x Undefined Figure 12 Timing of power down SIM968 by PWRKEY STATUS Output This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut dowm Before the completion of the power down procedure the module will send URC NORMAL POWER DOWN At this moment AT commands can not be executed any more and only the RTC is still active Power down mode can also be indicated by STATUS pin which is at low level at this time 4 2 2 2 Power down SIM968 by AT Command SIM968 can be powered down by AT command AT CPOWD 1 This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut down Before the completion of the power down procedure the module will send URC NORMAL POWER DOWN At this moment AT commands can not be executed any more and only the RTC is still active Power down mode can also be indicated by STATUS pin which is at low level at this time For detail about the AT command AT CPOWD please refer to document 1 SIM968_Hardware Design_V1 00 21 2013 02 25 Smart Machine Smart Decision 4 2 2 3 Over voltage or Under voltage Power down The module software monitors the VBAT voltage constantly I
61. on when a charger is connected to the switched off SIM968 of which VBAT pin voltage is greater than 3 2V SIM968 will go into the Charge only Mode In this mode the module does not register to the network and has only a few AT commands available When module is powered on using the VCHG signal SIM968 sends out result code as following when fixed baud rate set RDY CHARGE ONLY MODE When user drives the PWRKEY of Charge only mode SIM968 to a low level voltage for a period of time please refer to Figure 12 Timing of power on module the SIM968 will power up and go into Charge mode during normal operation In this case SIM968 sends out result code as following SIM968 Hardware Design V1 00 20 2013 02 25 Smart Machine Smart Decision From CHARGE ONLY MODE to NORMAL MODE In Charge mode during normal operation all operations and AT commands are available 4 2 2 Power down SIM968 SIM968 will be powered down in the following situations e Normal power down procedure power down SIM968 by the PWRKEY pin e Normal power down procedure power down SIM968 by AT command AT CPOWD 1 e Abnormal power down over voltage or under voltage automatic power down e Abnormal power down over temperature or under temperature automatic power down 4 2 2 1 Power down SIM968 by the PWRKEY Pin User can power down SIM968 by pulling down the PWRKEY pin for at least 1 second and release Please refer to the power on circuit The power down scenari
62. placed to Ki 1 speaker as close as possible Thelines in bold type should be accorded to differential i signal layout rules Ve 10pF 39pF Y ESD ii Amplifier ANTI SPK2P Circuit i MODULE L 33pF SPK2N m E gt sa p Rote pa 10pF 33pF ANTI Figure 23 Speaker with amplifier reference circuit SIM968_Hardware Design_V1 00 31 2013 02 25 Ep ort 3 dene Smart Machine Smart Decision 4 7 2 Microphone Interfaces Configuration These components should be placed to microphone as close as possible The lines in bold type should Spy 10PF 39pF be accorded to differential signal layout rules MIC1P Electret 10pF 33pF MODULE Microphone IC MIC1N 10pF 33pF Figure 24 Microphone reference circuit Microphone input also could be used to LINE IN input For details please refer to document 6 4 7 3 Earphone Interface Configuration Close to socket The lines in bold type should be accorded to differential signal layout rules MODULE i h 1uF SPK2P NNT 10R 3 33pF 10pF N Amt 33pF ANY ees Za N i Amphenol 9001 8905 050 Figure 25 Earphone reference circuit 4 7 4 Audio Electronic Characteristics Table 10 Microphone input characteristics Parameter Min Typ Max Unit Working Voltage 1 2 1 5 2 0 V Working Current 200 500 uA External Microphone Load Resistance 1 2 2 2 kQ Int
63. t necessary Reference circuit is shown as below 100K TJ PWRKEY Power on down logic 4 7K p Turn on off impulse 47K MODULE Figure 9 Powered on down module using transistor SIM968 Hardware Design V1 00 19 2013 02 25 Smart Machine Smart Decision AN 100K PWRKEY Power o o on down logic ESD ANTI MODULE Figure 10 Powered on down module using button The power on scenarios is illustrated as following figure Tpulldown gt 1S Tdelay gt 2 25 VBAT La pang sl Vin 24V PWRKEY i Input Von gt 2 7V STATUS Output Serial Port Undefined p Active Figure 11 Timing of power on module When power on procedure is completed SIM968 will send following URC to indicate that the module is ready to operate at fixed baud rate RDY This URC does not appear when autobauding function is active Note User can use AT command AT IPR x to set a fixed baud rate and save the configuration to non volatile flash memory After the configuration is saved as fixed baud rate the Code RDY should be received from the serial port every time when SIM968 is powered on For details please refer to the chapter AT IPR in document 1 4 2 1 2 Turn on the SIM968 using the VCHG Signal The SIM968 will be automatically turned
64. talum capacitor ESR 0 7Q Another VBAT bypass capacitor Cg 1uF SIM968_Hardware Design_V1 00 2013 02 25 Smart Machine Smart Decision 577uS_ 4615mS el i Burst 2A IyBAT VBAT Max 300mV Figure 7 VBAT voltage drop during transmit burst 4 1 1 Minimizing Voltage Drop of VBAT When designing the power supply in user s application pay special attention to power losses Ensure that the input voltage never drops below 3 1V even when current consumption rises to 2A in thetransmit burst If the power voltage drops below 3 1V the module may be shut down automatically The PCB traces from the VBAT pins to the power supply must be wide enough at least 60mil to decrease voltage drops in the transmit burst The power IC and the bypass capacitor should be placed to the module as close as possible VBAT Min 3 1V Figure 8 The minimal VBAT voltage requirement at VBAT drop 4 1 2 Monitoring Power Supply The AT command AT CBC can be used to monitor the VBAT voltage For detail please refer to document 1 4 2 Power on down Scenarios 4 2 1 Power on SIM968 4 2 1 1 Turn on SIM968 Using the PWRKEY Pin Power on User can power on SIM968 by pulling down the PWRKEY pin for at least I second and release This pin is already pulled up to 3V in the module internal so external pull up is no
65. the means to implement an active antenna supervisor with a minimal number of parts The antenna supervisor is highly configurable to suit various different applications Note The standard firmware does not support active antenna supervisor If user wants this function the firmware must be customized Please contact SIMCom for more details 5 5 3 1 Short circuit Detection If a short circuit in the active antenna pulls GPS VANT IN to ground then the module will detect it and the module will report SGPTXT 01 01 02 ANTSTATUS SHORT 6D sentence through the serial port The customer should check short circuit NOTE The antenna supply voltage is not derived from GPS VANT OUT 5 5 3 2 Open circuit Detection Firmware supports an active antenna supervisor circuit which is connected to the pin AADET N An example of an open circuit detection circuit is shown in Figure I land Figure 12 High 2 85 V level on AADET N means that an external antenna is not connected and the module will report GPTXT 01 01 02 ANTSTATUS OPEN 2B sentence through the serial port Low on AADET N means that an external antenna is connected and the module will report GPTXT 01 01 02 ANTSTATUS OK 3B sentence through the serial port SIM968 Hardware Design V1 00 47 2013 02 25 Smart Machine Smart Decision GND GPS_ANT GND GPS_VANT_OUT Active Antenna GPS VANT IN AADET N MODULE C1 Figure 43 Open circuir detection A Active Antenna GND GPS A

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