Simcom 201607 GSM/GPRS+GPS module User Manual UDV 201607 SIM868 REV2 4

Shanghai Simcom Ltd. GSM/GPRS+GPS module UDV 201607 SIM868 REV2 4

UDV-201607 SIM868_User Manual_REV2-4

SIM868_User Manual_REV2
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 2 2016-06-20 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. 2016 Compliance Information FCC Compliance Statement: This device complies with Part 15 of the FCC Rules . Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2. This device must accept any interference received, including interference that may cause undesired operation. This device must accept any interference received, including interference that may cause undesired operation. Product that is a radio transmitter is labeled with FCC ID. FCC Caution (1) Exposure to Radio Frequency Radiation. This equipment must be installed and operated in accordance with provided instructions and the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be collocated or operating in conjunction with any other antenna or transmitter. End-users and installers must be provided with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance. (2) Any changes or modifications not expressly approved by the grantee of this device could void the user's authority to operate the equipment. (3) This Transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. (4) Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user authority to operate the equipment. (5) The modules FCC ID is not visible when installed in the host, or (6) If the host is marketed so that end users do not have straight forward commonly used methods for access to remove the module so that the FCC ID of the module is visible; then an additional permanent label referring to the enclosed module Contains Transmitter Module FCC ID: UDV-201607 or Contains UDV-201607 must be used.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 3 2016-06-20 Contents Version History ........................................................................................................ 9 1. Introduction .................................................................................................... 10 2. SIM868 Overview ........................................................................................... 10 2.1. SIM868 .......................................................................................................................... 10 2.2. SIM868 Key Features ..................................................................................................... 10 2.3. Operating Mode .............................................................................................................. 13 2.4. Functional Diagram ........................................................................................................ 14 3. Package Information ...................................................................................... 15 3.1. Pin Out Diagram ............................................................................................................. 15 3.2. Pin Description ............................................................................................................... 15 3.3. Package Dimensions ....................................................................................................... 18 4. Application Interface ...................................................................................... 20 4.1. Power Supply ................................................................................................................. 20 4.1.1. Power Supply Pin ................................................................................................................................ 21 4.1.2. Monitoring Power Supply ................................................................................................................... 22 4.2. Power on/off SIM868 ..................................................................................................... 22 4.2.1. Power on SIM868 ............................................................................................................................... 22 4.2.2. Power off SIM868 ............................................................................................................................... 23 4.3. Power Saving Mode........................................................................................................ 25 4.3.1. Minimum Functionality Mode ............................................................................................................ 25 4.3.2. Sleep Mode 1 (AT+CSCLK=1) .......................................................................................................... 25 4.3.3. Wake Up SIM868 from Sleep Mode 1 ................................................................................................ 25 4.3.4. Sleep Mode 2 (AT+CSCLK=2) .......................................................................................................... 26 4.3.5. Wake Up SIM868 from Sleep Mode 2 ................................................................................................ 26 4.4. Power Saving Mode........................................................................................................ 26 4.5. Serial Port and USB Interface ......................................................................................... 27 4.5.1 Function of Serial Port ........................................................................................................................ 28 4.5.2 Serial Interfaces ................................................................................................................................... 29 4.5.3 Debug Interface ................................................................................................................................... 30 4.5.4 Software Upgrade ................................................................................................................................ 31 4.6. UART1_RI Behaviors .................................................................................................... 31 4.7. Audio Interfaces ............................................................................................................. 32 4.7.1. Speaker Interfaces Configuration ........................................................................................................ 33 4.7.2. Microphone Interfaces Configuration ................................................................................................. 34 4.7.3. Audio Electronic Characteristic .......................................................................................................... 34 4.7.4. TDD .................................................................................................................................................... 34 4.8. SIM Card Interface ......................................................................................................... 35 4.8.1. SIM Card Application ......................................................................................................................... 35
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 4 2016-06-20 4.8.2. SIM Card Design Guide ...................................................................................................................... 36 4.8.3. Design Considerations for SIM Card Holder ...................................................................................... 37 4.9. SD Interface ................................................................................................................... 39 4.10. I2C Bus .......................................................................................................................... 39 4.10.1. I2C Multiplexing Function .............................................................................................................. 39 4.11. ADC ............................................................................................................................... 40 4.12. Network Status Indication............................................................................................... 40 4.13. Operating Status Indication ............................................................................................. 41 4.14. RF Synchronization Signal ............................................................................................. 41 4.14.1. RF_SYNC Multiplexing Function ................................................................................................... 42 4.15. GNSS ............................................................................................................................. 42 4.15.1. GNSS Overview .............................................................................................................................. 42 4.15.2. Power on/down GNSS ..................................................................................................................... 42 4.15.3. 1PPS Output..................................................................................................................................... 42 4.16. Antenna Interface ........................................................................................................... 42 4.16.1. GSM Antenna Interface ................................................................................................................... 43 4.16.2. GNSS Antenna Interface .................................................................................................................. 46 5. PCB Layout ..................................................................................................... 48 5.1 Pin Assignment .............................................................................................................. 48 5.2 Principle of PCB Layout ................................................................................................. 49 5.2.1 Antenna Interface ................................................................................................................................ 49 5.2.2 Power Supply ...................................................................................................................................... 49 5.2.3 SIM Card Interface .............................................................................................................................. 49 5.2.4 Audio Interface.................................................................................................................................... 49 5.2.5 Others .................................................................................................................................................. 49 6. Electrical, Reliability and Radio Characteristics .......................................... 50 6.1 Absolute Maximum Ratings ........................................................................................... 50 6.2 Recommended Operating Conditions .............................................................................. 50 6.3 Digital Interface Characteristics ...................................................................................... 50 6.4 SIM Card Interface Characteristics ................................................................................. 50 6.5 SIM_VDD Characteristics .............................................................................................. 51 6.6 VDD_EXT Characteristics ............................................................................................. 51 6.7 Current Consumption（VBAT=4.0V） .......................................................................... 51 6.8 Electro-Static Discharge ................................................................................................. 52 6.9 Radio Characteristics ...................................................................................................... 52 6.9.1 Module RF Output Power ................................................................................................................... 52 6.9.2 Module RF Receive Sensitivity ........................................................................................................... 54 6.9.3 Module Operating Frequencies ........................................................................................................... 54 7. Manufacturing ................................................................................................ 55 7.1. Top and Bottom View of SIM868 ................................................................................... 55 7.2. Typical Solder Reflow Profile ........................................................................................ 55 7.3. The Moisture Sensitivity Level ....................................................................................... 55 7.4. Baking Requirements ..................................................................................................... 56
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 5 2016-06-20 8. Appendix ......................................................................................................... 57 I. Related Documents ......................................................................................................... 57 II. Multiplexing Function .................................................................................................... 58 III. Terms and Abbreviations ................................................................................................ 58 IV. Safety Caution ................................................................................................................ 60
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 6 2016-06-20 Table Index TABLE 1: MODULE INFORMATION ......................................................................................................................10 TABLE 2: SIM868 KEY FEATURES .........................................................................................................................10 TABLE 3: GNSS ENGINE PERFORMANCE ............................................................................................................12 TABLE 4: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ...........................13 TABLE 5: OVERVIEW OF OPERATING MODES....................................................................................................13 TABLE 6: PIN DESCRIPTION ..................................................................................................................................15 TABLE 7: RECOMMENDED ZENER DIODE ..........................................................................................................20 TABLE 8: THE CURRENT CONSUMPTION OF FUNCTION MODE .....................................................................25 TABLE 9: SERIAL PORT AND USB PIN DEFINITION ...........................................................................................27 TABLE 10: SERIAL PORT CHARACTERISTICS.....................................................................................................27 TABLE 11: USB_VBUS OPERATION VOLTAGE ....................................................................................................31 TABLE 12: RI BEHAVIORS......................................................................................................................................31 TABLE 13: AUDIO INTERFACE DEFINITION........................................................................................................32 TABLE 14: PERFORMANCE OF AUDIO AMPLIFIER ............................................................................................33 TABLE 15: MICROPHONE INPUT CHARACTERISTICS .......................................................................................34 TABLE 16: AUDIO OUTPUT CHARACTERISTICS ................................................................................................34 TABLE 17: SIM PIN DEFINITION ...........................................................................................................................35 TABLE 18: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) ...........................................................................37 TABLE 19: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER) ....................................................................38 TABLE 20: SD MULTIPLEXING FUNCTION ..........................................................................................................39 TABLE 21: PIN DEFINITION OF THE I2C ..............................................................................................................39 TABLE 22: I2C MULTIPLEXING FUNCTION .........................................................................................................39 TABLE 23: PIN DEFINITION OF THE ADC ............................................................................................................40 TABLE 24: ADC SPECIFICATION ...........................................................................................................................40 TABLE 25: PIN DEFINITION OF THE NETLIGHT .................................................................................................40 TABLE 26: STATUS OF THE NETLIGHT PIN .........................................................................................................40 TABLE 27: NETLIGHT MULTIPLEXING FUNCTION ............................................................................................41 TABLE 28: PIN DEFINITION OF THE STATUS ......................................................................................................41 TABLE 29: DEFINITION OF THE RF_SYNC PIN ...................................................................................................41 TABLE 30: RF_SYNC MULTIPLEXING FUNCTION ..............................................................................................42 TABLE 31: RECOMMENDED TVS COMPONENT .................................................................................................46 TABLE 32: ABSOLUTE MAXIMUM RATINGS ......................................................................................................50 TABLE 33: RECOMMENDED OPERATING CONDITIONS ....................................................................................50 TABLE 34: DIGITAL INTERFACE CHARACTERISTICS ........................................................................................50 TABLE 35: SIM CARD INTERFACE CHARACTERISTICS ....................................................................................50 TABLE 36: SIM_VDD CHARACTERISTICS ...........................................................................................................51 TABLE 37: VDD_EXT CHARACTERISTICS ...........................................................................................................51 TABLE 38: CURRENT CONSUMPTION..................................................................................................................51 TABLE 39: THE ESD CHARACTERISTICS (TEMPERATURE: 25℃, HUMIDITY: 45 %) ......................................52 TABLE 40: GSM850 AND EGSM900 CONDUCTED RF OUTPUT POWER............................................................53 TABLE 41: DCS1800 AND PCS1900 CONDUCTED RF OUTPUT POWER ............................................................53 TABLE 42: CONDUCTED RF RECEIVE SENSITIVITY..........................................................................................54 TABLE 43: OPERATING FREQUENCIES ................................................................................................................54 TABLE 44: MOISTURE SENSITIVITY LEVEL AND FLOOR LIFE ........................................................................56 TABLE 45: BAKING REQUIREMENTS...................................................................................................................56 TABLE 46: RELATED DOCUMENTS ......................................................................................................................57
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 7 2016-06-20 TABLE 47: MULTIPLEXING FUNCTION................................................................................................................58 TABLE 48: TERMS AND ABBREVIATIONS ...........................................................................................................58 TABLE 49: SAFETY CAUTION ...............................................................................................................................60
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 8 2016-06-20 Figure Index FIGURE 1: SIM868 FUNCTIONAL DIAGRAM .......................................................................................................14 FIGURE 2: PIN OUT DIAGRAM (TOP VIEW).........................................................................................................15 FIGURE 3: DIMENSIONS OF SIM868 (UNIT: MM) ................................................................................................18 FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE (UNIT: MM) ..............................................................19 FIGURE 5: REFERENCE CIRCUIT OF THE VBAT/GPS_VBAT INPUT .................................................................20 FIGURE 6: REFERENCE CIRCUIT OF THE LDO POWER SUPPLY ......................................................................20 FIGURE 7: REFERENCE CIRCUIT OF THE DC-DC POWER SUPPLY ..................................................................21 FIGURE 8: VBAT VOLTAGE DROP DURING TRANSMIT BURST ........................................................................21 FIGURE 9: THE MINIMAL VBAT VOLTAGE REQUIREMENT AT VBAT DROP...................................................21 FIGURE 10: POWERED ON/DOWN MODULE USING TRANSISTOR ..................................................................22 FIGURE 11: POWERED ON/DOWN MODULE USING BUTTON ..........................................................................22 FIGURE 12: TIMING OF POWER ON MODULE.....................................................................................................22 FIGURE 13: TIMING OF POWER OFF SIM868 BY PWRKEY ................................................................................23 FIGURE 14: TIMING OF RESTART SIM868 ............................................................................................................24 FIGURE 15: RTC SUPPLY FROM CAPACITOR ......................................................................................................26 FIGURE 16: RTC SUPPLY FROM NON-CHARGEABLE BATTERY .......................................................................26 FIGURE 17: RTC SUPPLY FROM RECHARGEABLE BATTERY ...........................................................................27 FIGURE 18: CONNECTION OF THE SERIAL INTERFACES .................................................................................29 FIGURE 19: RESISTOR MATCHING CIRCUIT .......................................................................................................29 FIGURE 20 : DIODE ISOLATION CIRCUIT ............................................................................................................29 FIGURE 21: TX LEVEL MATCHING CIRCUIT .......................................................................................................30 FIGURE 22: RX LEVEL MATCHING CIRCUIT .......................................................................................................30 FIGURE 23: USB REFERENCE CIRCUIT ................................................................................................................30 FIGURE 24: CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING ................................................31 FIGURE 25: UART1_RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER .....................................................32 FIGURE 26: UART1_RI BEHAVIOUR OF URC OR RECEIVE SMS .......................................................................32 FIGURE 27: UART1_RI BEHAVIOUR AS A CALLER .............................................................................................32 FIGURE 28: SPEAKER REFERENCE CIRCUIT ......................................................................................................33 FIGURE 29: MICROPHONE REFERENCE CIRCUIT ..............................................................................................34 FIGURE 30: REFERENCE CIRCUIT OF THE 8-PIN SIM CARD HOLDER ............................................................35 FIGURE 31: REFERENCE CIRCUIT OF THE 6-PIN SIM CARD HOLDER ............................................................36 FIGURE 32: MOLEX 91228 SIM CARD HOLDER ..................................................................................................37 FIGURE 33: AMPHENOL C707 10M006 512 SIM CARD HOLDER ........................................................................38 FIGURE 34: SD REFERENCE CIRCUIT ..................................................................................................................39 FIGURE 35: REFERENCE CIRCUIT OF NETLIGHT...............................................................................................41 FIGURE 36: RF_SYNC SIGNAL DURING TRANSMIT BURST .............................................................................42 FIGURE 37: GSM ANTENNA MATCHING CIRCUIT ..............................................................................................43 FIGURE 38: GSM ANTENNA MATCHING CIRCUIT WITHOUT RF CONNECTOR..............................................43 FIGURE 39: GNSS PASSIVE ANTENNA MATCHING CIRCUIT ............................................................................47 FIGURE 40: GNSS ACTIVE ANTENNA MATCHING CIRCUIT..............................................................................47 FIGURE 41: PIN ASSIGNMENT ..............................................................................................................................48 FIGURE 42: TOP AND BOTTOM VIEW OF SIM868 ...............................................................................................55 FIGURE 43: TYPICAL SOLDER REFLOW PROFILE OF LEAD-FREE PROCESS .................................................55
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 9 2016-06-20 Version History Date Version Description of change Author 2016-06-20 1.00 Origin Yanwu.Wang; Xiaoxu.Chen
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 10 2016-06-20 1. Introduction This document describes SIM868 hardware interface in great detail. The document can help customer to quickly understand SIM868 interface specifications, electrical and mechanical details. With the help of this document and other SIM868 application notes, customer guide, customers can use SIM868 to design various applications quickly. 2. SIM868 Overview Designed for global market, SIM868 is integrated with a high performance GSM/GPRS engine and a GNSS engine. SIM868 is a quad-band GSM/GPRS module that works on frequencies GSM 850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. SIM868 features GPRS multi-slot class 12/class 10 (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 a tiny configuration of 17.6*15.7*2.3mm, SIM868 can meet almost all the space requirements in customers’ applications, such as smart phone, PDA and other mobile devices. SIM868 is a SMT+LGA package with 77 pads, and provides all hardware interfaces between the module and customers’ boards.  One 3 lines serial port and one full modem serial port;  USB interface which can be used for debugging and upgrading firmware;  Audio channels which include a microphone input and two speakers output;  Programmable general purpose input and output;  Two SIM cards interface;  Support GNSS function;  SD card interface;  I2C interface;  ADC interface. SIM868 is designed with power saving technique so that the current consumption is as low as 0.65 mA in sleep mode (with GNSS engine powered down). SIM868 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]. 2.1. SIM868 Table 1: Module Information Information SIM868 GSM 850,900,1800 and 1900MHz GNSS GNSS interface FLASH 32Mbit RAM 32Mbit 2.2. SIM868 Key Features Table 2: SIM868 Key Features
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 11 2016-06-20 Feature Implementation Power supply 3.4V ~4.2V Power saving Typical power consumption in sleep mode is 0.65 mA (AT+CFUN=0 ) Frequency bands  Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. SIM868 can search the 4 frequency bands automatically. The frequency bands can also be set by AT command “AT+CBAND”. For details, please refer to document [1].  Compliant to GSM Phase 2/2+ Transmitting power  Class 4 (2W) at GSM 850 and EGSM 900  Class 1 (1W) at DCS 1800 and PCS 1900 GPRS connectivity  GPRS multi-slot class 12（default）  GPRS multi-slot class 1~12 (option) Temperature range  Normal operation: -40°C ~ +85°C  Storage temperature -45°C ~ +90°C Data GPRS  GPRS data downlink transfer: max. 85.6 kbps  GPRS data uplink transfer: max. 85.6 kbps  Coding scheme: CS-1, CS-2, CS-3 and CS-4  PAP protocol for PPP connect  Integrate the TCP/IP protocol.  Support Packet Broadcast Control Channel (PBCCH) USSD  Unstructured Supplementary Services Data (USSD) support SMS  MT, MO, CB, Text and PDU mode  SMS storage: SIM card SIM interface Support SIM card: 1.8V, 3V External antenna Antenna pad Audio features 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 and USB port Serial port:  Default one Full modem serial port  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 115200bps  upgrading firmware USB port:  Can be used for debugging and upgrading firmware Phonebook management Support phonebook types: SM, FD, LD, RC, ON, MC SIM application toolkit GSM 11.14 Release 99 Physical characteristics  Size:17.6*15.7*2.3mm  Weight:1.5g Firmware upgrade Full modern serial port or USB interface (recommend to use USB port)
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 12 2016-06-20 Table 3: GNSS engine Performance Parameter Description Performance Min Type Max Unit Horizontal Position Accuracy(1) Autonomous <2.5 m Velocity Accuracy(2) Without Aid 0.1 m/s DGPS 0.05 m/s Acceleration Accuracy Without Aid 0.1 m/s2 DGPS 0.05 m/s2 Timing Accuracy 10 nS Backup batter voltage V_BACKUP 2.3 4.3 V Dynamic Performance Maximum Altitude 18000 m Maximum Velocity 515 m/s Maximum Acceleration 4 G TTFF with GPS only(3) Hot start 0.7 s Warm start 21.4 s Cold start 22.3 s TTFF with GLONASS only(3) Hot start 0.7 s Warm start 21.2 s Cold start 21.68 s TTFF with GPS and GLONASS (3) Hot start 0.6 s Warm start 21.54 s Cold start 21.67 s A-GPS TTFF(EPO in flash mode) Hot start 0.6 s Warm start 21.32 s Cold start 22.17 s Sensitivity with GPS only mode Autonomous acquisition(cold start) -148 dBm Re-acquisition -158 dBm Tracking -166 dBm Sensitivity with GLONASS only mode Autonomous acquisition(cold start) -147 dBm Re-acquisition -155 dBm Tracking -160 dBm Sensitivity with GPS and GLONASS Autonomous acquisition(cold start) -149 dBm Re-acquisition -157 dBm Tracking -162 dBm Receiver Channels 22/66 Update rate 5 Hz Tracking L1, CA Code Protocol support
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 13 2016-06-20 NMEA Power consumption With GPS only mode(4) Acquisition 23.4 mA Continuous tracking 22.6 mA Sleep current 650 uA Power consumption With GLONASS only mode(4) Acquisition 24 mA Continuous tracking 21 mA Sleep current 650 uA Power consumption With GPS and GLONASS (4) Acquisition 31 mA Continuous tracking 26 mA Sleep current 650 uA (1) 50% 24hr static, -130dBm (2) 50% at 30m/s (3) GPS signal level: -130dBm (4) Single Power supply 3.8V@-130dBm,GSM IDLE Table 4: Coding schemes and maximum net data rates over air interface Coding scheme 1 timeslot 2 timeslot 4 timeslot CS-1 9.05kbps 18.1kbps 36.2kbps CS-2 13.4kbps 26.8kbps 53.6kbps CS-3 15.6kbps 31.2kbps 62.4kbps CS-4 21.4kbps 42.8kbps 85.6kbps 2.3. Operating Mode The table below summarizes the various operating modes of SIM868. Table 5: Overview of operating modes Mode Function Normal operation GSM/GPRS SLEEP Module will automatically go into sleep mode if the conditions of sleep mode are enabling and there aren’t on air and 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. GSM IDLE Software is active. Module is registered to the GSM network, and the module is ready to communicate. GSM TALK 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. GPRS STANDBY 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. GPRS DATA There is GPRS data transfer (PPP or TCP or UDP) in progress. In this case,
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 14 2016-06-20 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). Power off Normal power off by sending 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. Software is not active. The serial port is not accessible. Power supply (connected to 3V) remains applied. Minimum functionality mode 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. 2.4. Functional Diagram The following figure shows a functional diagram of SIM868:  GSM baseband  PMU  The GSM Radio Frequency part  Antenna interface  GNSS interface  Other interface Figure 1: SIM868 functional diagram
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 15 2016-06-20 3. Package Information 3.1. Pin Out Diagram Figure 2: Pin out Diagram (Top view) 3.2. Pin Description Table 6: Pin description Pin name Pin number I/O Description Comment Power supply GPS_VBAT 34 I Power supply for GNSS VBAT 35 I Power supply for GSM VDD_EXT 40 O 2.8V power output If these pins are unused, keep open.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 16 2016-06-20 GND 8,13,19,21,27,30, 31,33,36,37,45,63,66,67,69,70,71,72,73,74,75,76,77 Ground GND for VBAT recommend to use 36,37pin Power on/down PWRKEY 39 I PWRKEY should be pulled low and then released to power on/down the module. Internally pulled up to 3V. Audio interfaces MICP 9 I Differential audio input If these pins are unused, keep open. MICN 10 SPK1P 11 O Differential audio output SPK1N 12 SPK2P 44 SPK2N 43 GNSS interface GPS_RXD 62 I Receive data If these pins are unused, keep open. GPS_TXD 61 O Transmit data 1PPS 60 O Time Mark outputs timing pulse related to receiver time GPS_EN 59 I GNSS power enable VRTC 28 I/O Power supply for GNSS RTC It is recommended to connect with a battery. SD interface MCCA3 46 I/O SD serial data I/O If these pins are unused, keep open. MCCA2 47 I/O MCCA1 48 I/O MCCA0 49 I/O MCCK 50 I/O SD serial clock MCCM0 51 I/O SD command output GPIO NETLIGHT 41 O Network status If these pins are unused, keep open. STATUS 42 O Power on status GPIO1 57 I/O Programmable general purpose input and output. GPIO2 58 I/O Serial port UART1_DTR 6 I Data terminal ready If these pins are unused, keep open. UART1_RI 7 O Ring indicator UART1_DCD 5 O Data carrier detect UART1_CTS 4 O Clear to send UART1_RTS 3 I Request to send UART1_TXD 1 O Transmit data
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 17 2016-06-20 UART1_RXD 2 I Receive data UART2_TXD 22 O Transmit data UART2_RXD 23 I Receive data Debug interface USB_VBUS 24 I Debug and download If these pins are unused, keep open. USB_DP 25 I/O USB_DM 26 I/O ADC ADC 38 I 10bit general analog to digital converter If these pins are unused, keep open. I2C SDA 64 I/O I2C serial bus data Internal pulled up to 2.8V via 4.7KΩ SCL 65 O I2C serial bus clock SIM card interface SIM1_VDD 18 O Voltage supply for SIM card. Support 1.8V or 3V SIM card All signals of SIM interface should be protected against ESD with a TVS diode array. SIM1_DATA 15 I/O SIM data input/output SIM1_CLK 16 O SIM clock SIM1_RST 17 O SIM reset SIM1_DET 14 I SIM card detection If these pins are unused, keep open. SIM2_VDD 56 O Voltage supply for SIM card. Support 1.8V or 3V SIM card All signals of SIM interface should be protected against ESD with a TVS diode array. SIM2_DATA 53 I/O SIM data input/output SIM2_CLK 54 O SIM clock SIM2_RST 55 O SIM reset SIM2_DET 52 I SIM card detection If these pins are unused, keep open. Antenna interface GSM_ANT 32 I/O Connect GSM antenna If these pins are unused, keep open. NC 20 I/O Connect Bluetooth antenna GPS_ANT 68 I Connect GNSS antenna Synchronizing signal of RF RF_SYNC 29 O Synchronizing signal of RF
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 18 2016-06-20 3.3. Package Dimensions Figure 3: Dimensions of SIM868 (Unit: mm)
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 19 2016-06-20 Figure 4: Recommended PCB footprint outline (Unit: mm)
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 20 2016-06-20 4. Application Interface 4.1. Power Supply The power supply range of SIM868 is from 3.4V to 4.2V. Recommended voltage is 4.0V. The transmitting burst will cause voltage drop and the power supply must be able to provide sufficient current up to 2A. For the VBAT /GPS_VBAT input, a bypass capacitor (low ESR) such as a 100 µF is strongly recommended. For the VBAT/GPS_VBAT input, a 100uF Tantalum capacitor (CA low ESR) and a 1uF~10uF Ceramics capacitor CB are strongly recommended. Increase the 33pF and 10pF capacitors can effectively eliminate the high frequency interference. A 5.1V/500mW Zener diode is strongly recommended, the diode can prevent chip from damaging by the voltage surge. These capacitors and Zener diode should be placed as close as possible to SIM868 VBAT pins. Figure 5: Reference circuit of the VBAT/GPS_VBAT input Table 7: Recommended zener diode Vendor Part number Power(watts) Packages 1 On semi MMSZ5231BT1G 500mW SOD123 2 Prisemi PZ3D4V2H 500mW SOD323 3 Vishay MMSZ4689-V 500mW SOD123 4 Crownpo CDZ55C5V1SM 500mW 0805 The following figure is the reference design of +5V input power supply. The output power supply is 4.1V, thus a linear regulator can be used. Figure 6: Reference circuit of the LDO power supply
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 21 2016-06-20 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. Figure 7: Reference circuit of the DC-DC power supply The single 3.7V Li-ion cell battery can be connected to SIM868 VBAT/GPS_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/GPS_VBAT pins should be less than 150mΩ. 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=100µF tantalum capacitor (ESR=0.7Ω), Another VBAT bypass capacitor CB=1uF~10uF. 577us 4.615msBurst:2AIVBATVBATMax:350mV Figure 8: VBAT voltage drop during transmit burst 4.1.1. Power Supply Pin Pin34 and Pin35 are GPS_VBAT and VBAT input; Pin36 and Pin37 are GND of power supply. VDD_EXT output 2.8V when module is in normal operation mode. When designing the power supply in customers’ application, pay special attention to power losses. Ensure that the input voltage never drops below 3.0V even when current consumption rises to 2A in the transmit burst. If the power voltage drops below 3.0V, 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. VBATMIN:3.0V Figure 9: The minimal VBAT voltage requirement at VBAT drop
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 22 2016-06-20 Note: Hardware power off voltage is 3.0V. 4.1.2. Monitoring Power Supply AT command “AT+CBC” can be used to monitor the VBAT voltage. For detail, please refer to document [1]. 4.2. Power on/off SIM868 4.2.1. Power on SIM868 Customer can power on SIM868 by pulling down the PWRKEY pin for at least 1 second and release. This pin is already pulled up to 3V in the module internal, so external pull up is not necessary. Reference circuits are shown as below. 4.7K47KTurn on/off impulsePWRKEY Power on/off logic100K3VModule1K Figure 10: Powered on/down module using transistor PWRKEY Power on/off logic100K3VModule1K Figure 11: Powered on/down module using button The power on timing is illustrated as in the following figure. Figure 12: Timing of power on module
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 23 2016-06-20 When power on procedure is completed, SIM868 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: Customer 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 SIM868 is powered on. For details, please refer to the chapter “AT+IPR” in document [1]. 4.2.2. Power off SIM868 SIM868 will be powered off in the following situations：  Normal power off procedure: power off SIM868 by the PWRKEY pin.  Normal power off procedure: power off SIM868 by AT command “AT+CPOWD=1”.  Abnormal power off: over-voltage or under-voltage automatic power off.  Abnormal power off: over-temperature or under-temperature automatic power off. 4.2.2.1. Power off SIM868 by the PWRKEY Pin Customer can power off SIM868 by pulling down the PWRKEY pin for at least 1 second and release. Please refer to the power on circuit. The power off timing is illustrated in the following figure. Figure 13: Timing of power off SIM868 by PWRKEY Note: 1. the module will restart after pull down the pwrkey over 33 seconds. 2. VDD_EXT will power off after STATUS change into low level and the PWRKEY release 55ms.. If 1s<T1<2s，T2>2s； If 2s≤T1<33s，T2>T1+55ms 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 off procedure, the module will send URC: NORMAL POWER OFF At this moment, AT commands can’t be executed any more. Power off mode can also be indicated by STATUS pin, which is at low level at this time.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 24 2016-06-20 4.2.2.2. Power off SIM868 by AT Command SIM868 can be powered off 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 off procedure, the module will send URC: NORMAL POWER OFF At this moment, AT commands can’t be executed any more. Power off mode can also be indicated by STATUS pin, which is at low level at this time. For detail about AT command “AT+CPOWD”, please refer to document [1]. 4.2.2.3. Over-Temperature or Under-Temperature Power off The module will constantly monitor the temperature of the module, If the temperature ≥ +80℃, the following URC will be reported: +CMTE: 1 If the temperature ≤ -30℃, the following URC will be reported: +CMTE:-1 If the temperature > +85℃, the following URC will be reported, and the module will be automatically powered off. +CMTE: 2 If the temperature < -40℃, the following URC will be reported, and the module will be automatically powered off. +CMTE:-2 At this moment, AT commands can’t be executed any more. Power off mode can also be indicated by STATUS pin, which is at low level at this time. Note：The default temperature detect is disable, AT command “AT+CMTE” could be used to read the temperature when the module is running.For details please refer to document [1]. 4.2.2.4. Restart SIM868 by PWRKEY Pin: When the module works normally, if the customer wants to restart the module, follow the procedure below: 1) Power off the module. 2) Wait for at least 800ms after STATUS pin changed to low level. 3) Power on the module. Figure 14: Timing of restart SIM868
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 25 2016-06-20 4.3. Power Saving Mode SIM868 has two power saving modes: Minimum functionality mode and sleep mode. AT command “AT+CSCLK=1”can be used to set SIM868 into sleep mode. AT command “AT+CFUN=<fun>“can be used to set SIM868 into minimum functionality. When SIM868 is in sleep mode and minimum functionality mode, the current of module is lowest. 4.3.1. Minimum Functionality Mode There are three functionality modes, which could be set by AT command “AT+CFUN=<fun>“. The command provides the choice of the functionality levels <fun>=0, 1, 4.  AT+CFUN=0： Minimum functionality.  AT+CFUN=1： Full functionality (default).  AT+CFUN=4： Flight mode (disable RF function). Table 8: The current consumption of Function Mode <fun> BS-PA-MFRMS Current consumption(mA) 0 / 0.65 1 9 0.86 5 1.02 2 1.42 4 / 0.69 Minimum functionality mode minimizes the current consumption to the lowest level. If SIM868 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 partial AT commands and correlative to RF function and SIM card function will not be accessible. For detailed information about AT command “AT+CFUN=<fun>“, please refer to document [1]. 4.3.2. Sleep Mode 1 (AT+CSCLK=1) Customer can control SIM868 module to enter or exit the sleep mode (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), SIM868 will enter sleep mode automatically. In this mode, SIM868 can still receive paging or SMS from network but the serial port is not accessible. 4.3.3. Wake Up SIM868 from Sleep Mode 1 When SIM868 is in sleep mode 1(AT+CSCLK=1), the following methods can wake up the module:  Pull down DTR pin. The serial port will be active after DTR pin is pulled to low level for about 50ms.  Receive a voice or data call from network.  Receive a SMS from network.  Receive external interrupt. Note: After module has received incoming call or new SMS, serial port can report URC, but the serial port can not input AT command. Only after the DTR pin is pulled to low level for 50ms, the serial port can input AT
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 26 2016-06-20 command. 4.3.4. Sleep Mode 2 (AT+CSCLK=2) In this mode, SIM868 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), SIM868 will enter sleep mode 2 automatically. In this mode, SIM868 can still receive paging or SMS from network. 4.3.5. Wake Up SIM868 from Sleep Mode 2 When SIM868 is in sleep mode 2 (AT+CSCLK=2), the following methods can wake up the module:  Send data to SIM868 via main serial port (the first character will lose).  Receive a voice or data call from network.  Receive a SMS from network. Note: Autobauding is default. It cannot enter sleep mode in the absence of synchronous serial port baud rate after module power on. 4.4. Power Saving Mode Current input for GNSS RTC when the GPS_VBAT is not supplied for the GNSS power system. Current output for backup battery when the GPS_VBAT power supply is in present and the backup battery is in low voltage state. The RTC power supply of GNSS 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.  External capacitor backup Figure 15: RTC supply from capacitor  Non-chargeable battery backup Figure 16: RTC supply from non-chargeable battery
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 27 2016-06-20  Rechargeable battery backup Figure 17: RTC supply from rechargeable battery 4.5. Serial Port and USB Interface SIM868 default provides one unbalanced asynchronous serial ports. The module is designed as a DCE (Data Communication Equipment). The following figure shows the connection between module and client (DTE). Table 9: Serial port and USB pin definition Note: Hardware flow control is disabled by default. AT command “AT+IFC=2, 2”can enable hardware flow control. AT command “AT+IFC=0,0”can disable hardware flow control. For more details please refer to document [1]. Table 10: Serial port characteristics Symbol Min Max Unit VIL -0.3 0.7 V VIH 2.1 3.1 V VOL - 0.4 V Pin name Pin number Function Serial port UART1_DTR 6 Data terminal ready UART1_RI 7 Ring indicator UART1_DCD 5 Data carrier detect UART1_CTS 4 Clear to send UART1_RTS 3 Request to send UART1_TXD 1 Transmit data UART1_RXD 2 Receive data UART2_TXD 22 Transmit data UART2_RXD 23 Receive data GPS_TXD 61 Transmit data GPS_RXD 62 Receive data Debug port USB_VBUS 24 USB power supply USB_DP 25 D+ data input/output USB_DM 26 D- data input/output
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 28 2016-06-20 VOH 2.4 - V 4.5.1 Function of Serial Port Serial port:  Full mode device.  Contain data lines UART1_TXD/UART1_RXD, hardware flow control lines UART1_RTS/UART1_CTS, status lines UART1_DTR、UART1_DCD and UART1_RI.  Serial port can be used for GPRS service and AT communication. It can also be used for multiplexing function. For details about multiplexing function, please refer to table 11.  Autobauding supports the following baud rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200bps Autobauding allows SIM868 to automatically detect the baud rate of the host device. Pay more attention to the following requirements:  Synchronization between DTE and DCE: When DCE powers on with autobauding enabled, it is recommended to send "AT" or "at" or "aT" or "At" to synchronize the baud rate, until DTE receives the "OK" response, which means DTE and DCE are correctly synchronized. For more information please refer to AT command "AT+IPR".  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: Customer 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: 1" and "+CPIN: READY” will be reported when SIM868 is powered on.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 29 2016-06-20 4.5.2 Serial Interfaces The following figure shows the connection between module and client (DTE). UART1_TXDUART1_RXDUART1_RTSUART1_CTSUART1_DTRUART1_DCDUART1_RITXDRXDRTSCTSDTRDCDRINGSerial Port Serial PortModule(DCE) Customer(DTE)GND GND Figure 18: Connection of the serial interfaces If the voltage of UART is 3.3V, the following reference circuits are recommended. If the voltage is 3.0V, please change the resistors in the following figure from 5.6K to 14K. 1K5.6KRXDTXDRTSCTSGPIOGPIOEINTDTE(3.3V)5.6K5.6K1K1K1K1K1K1KModuleUART1_TXDUART1_RXDUART1_RTSUART1_CTSUART1_DTRUART1_DCDUART1_RIGND GND Figure 19: Resistor matching circuit If the voltage of UART is 3V or3.3V, the following reference circuits are recommended: UART1_TXD RXDModule DTETXDUART1_RXDVDD_EXT10K10KGND GND Figure 20 : Diode isolation circuit Note: please make sure the minimum of client high limit should be less than 2.8V minus the diode drop.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 30 2016-06-20 If the voltage of UART is 5V, the following reference circuits are recommended: VDD_EXT4.7K47KUART1_TXD4.7KModuleVDD_EXTRXDVDDDTE Figure 21: TX level matching circuit VDD_EXT4.7K47K4.7KDTEUART1_RXDModuleVDD_EXTTXDVDD Figure 22: RX level matching circuit 4.5.3 Debug Interface SIM868 could achieve software debug function through USB interface. When powering on the module, connect USB_VBUS, USB_DP, USB_DM, and GND to PC, then install the driver following the prompts, a UART port could be recognized by PC, customer could achieve the software Debug with this UART port. SIMCom recommended the following connected diagram: MODULE USBGNDGND22RUSB_VBUS VBUS1uFUSB_DMUSB_DPUSB_DM22RUSB_DP Figure 23: USB reference circuit The TVS on USB data line should be less than 5pF, and traced by differential forms.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 31 2016-06-20 Note: please reserve the USB interface or test point for the further debugging Table 11: USB_VBUS operation voltage Pin Min Typ Max Unit USB_VBUS 4.3 5.0 7.0 V 4.5.4 Software Upgrade Customer could upgrade module’s firmware through USB or UART interface. If upgrading through USB interface, it is necessary to power on SIM868 first, and then connect USB_VBUS, USB_DP, USB_DM, and GND to PC. There is no need to operate PWRKEY pin in the whole procedure, when SIM868 detects USB_VBUS and could communicate normally with USB_DP and USB_DM, it will enter USB download mode automatically. If customer upgrades the software through UART interface, it is strongly recommended to lead the UART1_TXD, UART1_RXD, GND and PWRKEY pin to IO connector for the upgrading, and PWRKEY pin should connect to GND while upgrading. Refer to the following figure for debugging and upgrading software. UART1_TXDModule(DCE)UART1_RXDGNDPWRKEYTXDRXDGNDSerial PortPWRKEYI/O Connector Figure 24: Connection for software upgrading and debugging The UART interface supports the CMOS level. If customer connects the module to the computer, the level shifter should be added between the DCE and DTE. 4.6. UART1_RI Behaviors Table 12: RI behaviors State RI response Standby High 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 SMS The pin is changed to low, and kept low for 120ms when a SMS is received. Then it is changed to high. Others For more details, please refer to document [2].
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 32 2016-06-20 The behavior of the RI pin is shown in the following figure when the module is used as a receiver. HIGHLOWIdle RingHang up the callEstablish the callRI Figure 25: UART1_RI behaviour of voice calling as a receiver HIGHLOWIdleRI120msReceive SMSURC Figure 26: UART1_RI behaviour of URC or receive SMS However, if the module is used as caller, the UART1_RI will remain high. Please refer to the following figure. HIGHLOWIdle Ring Establish the callHang up the callIdleRI Figure 27: UART1_RI behaviour as a caller 4.7. Audio Interfaces SIM868 provides an analog input (MICP; MICN), which could be used for electret microphone. The module also provides two analog outputs (SPK1P/2P; SPK1N/2N). Table 13: Audio interface definition SPK1P/1N output can directly drive 32Ω receiver. Pin name Pin number Function MICP 9 Audio input positive MICN 10 Audio input negative SPK1P 11 Audio output positive SPK1N 12 Audio output negative SPK2P 44 Audio output positive SPK2N 43 Audio output negative
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 33 2016-06-20 SIM868 internal has class-AB audio amplifier, the following table is class-AB performance: Table 14: Performance of audio amplifier Test Conditions Class-AB AMP 4.2V 8Ω THD+N=1% 0.87W 3.3V 8Ω THD+N=1% 0.53W 4.2V 8Ω THD+N=10% 1.08W 3.3V 8Ω THD+N=10% 0.65W SPK2P/2N output can directly drive 8Ω speaker. 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]. 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. 4.7.1. Speaker Interfaces Configuration SPK1P/2PClose to speakerESDESD10pF33pF33pF33pFModuleSPK1N/2N10pF10pF10pF33pF33pF33pF10pF10pF Figure 28: Speaker reference circuit
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 34 2016-06-20 4.7.2. Microphone Interfaces Configuration Electret MicrophoneThe lines in bold type should be accorded to differential signal layout rulesThese components should be placed to microphone as close as possibleMICPModuleMICNESDESD10pF33pF33pF33pF10pF10pF Figure 29: Microphone reference circuit 4.7.3. Audio Electronic Characteristic Table 15: Microphone input characteristics Parameter Min Typ Max Unit Microphone biasing voltage - 1.9 2.2 V Working current - - 2.0 mA Input impedance(differential) 13 20 27 KΩ Idle channel noise - - -67 dBm0 SINAD Input level:-40dBm0 29 - - dB Input level:0dBm0 - 69 - dB Table 16: Audio output characteristics Parameter Conditions Min Typ Max Unit Normal output RL=32 Ω receiver - 15 90 mW RL=8 Ω speaker - - 1080 mW 4.7.4. TDD Audio signal could be interferenced by RF signal. Coupling noise could be filtered by adding 33pF and 10pF capacitor to audio lines. 33pF capacitor could eliminate noise from GSM850/EGSM900MHz, while 10pF capacitor could eliminate noise from DCS1800/PCS1900Mhz frequency. Customer should develop this filter solution according to field test result. GSM antenna is the key coupling interfering source of TDD noise. Thereat, pay attention to the layout of audio lines which should be far away from RF cable, antenna and VBAT pin. The bypass capacitor for filtering should be placed near module and another group needs to be placed near to connector.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 35 2016-06-20 Conducting noise is mainly caused by the VBAT drop. If audio PA was powered by VBAT directly, then there will be some cheep noise from speaker output easily. So it is better to put big capacitors and ferrite beads near audio PA input. TDD noise has something to do with GND signal. If GND plane is not good, lots of high-frequency noises will interference microphone and speaker over bypass capacitor. So a good GND during PCB layout could avoid TDD noise. 4.8. SIM Card Interface The SIM interface complies with the GSM Phase 1 specification and the new GSM Phase 2+ specification for FAST 64kbps SIM card. Both 1.8V and 3.0V SIM card are supported. The SIM interface is powered from an internal regulator in the module. 4.8.1. SIM Card Application Table 17: SIM pin definition Pin name Pin number Function SIM1_VDD 18 Voltage supply for SIM card. Support 1.8V or 3V SIM card SIM1_DATA 15 SIM data input/output SIM1_CLK 16 SIM clock SIM1_RST 17 SIM reset SIM1_DET 14 SIM card detection SIM2_VDD 56 Voltage supply for SIM card. Support 1.8V or 3V SIM card SIM2_DATA 53 SIM data input/output SIM2_CLK 54 SIM clock SIM2_RST 55 SIM reset SIM2_DET 52 SIM card detection It is recommended to use an ESD protection component such as ST (www.st.com ) ESDA6V1-5W6 or ON SEMI (www.onsemi.com ) SMF05C. The SIM card peripheral components should be placed close to the SIM card holder. The reference circuit of the 8-pin SIM card holder is illustrated in the following figure. ModulePRESENCE100nFMOLEX-91228SIM Card22pFVCC GNDRST VPPCLK I/OGNDVDD_EXTSIM_VDDSIM_RSTSIM_CLKSIM_DATA4.7KESDA6V1SIM_DET51O51O22pF51O22pF Figure 30: Reference circuit of the 8-pin SIM card holder The SIM_DET pin is used for detection of the SIM card hot plug in. Customer can select the 8-pin SIM card
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 36 2016-06-20 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, customer can keep the SIM_DET pin open. The reference circuit of 6-pin SIM card holder is illustrated in the following figure. Module100nFMOLEX-91228C107 10M 006 51222pFVCC GNDRST VPPCLK I/OSIM_VDDSIM_RSTSIM_CLKSIM_DATAESDA6V1SIM_DET51O51O22pF51O22pF Figure 31: Reference circuit of the 6-pin SIM card holder 4.8.2. SIM Card Design Guide SIM card signal could be interferenced by some high frequency signal, it is strongly recommended to follow these guidelines while designing:  SIM card holder should be far away from GSM antenna  SIM traces should keep away from RF lines, VBAT and high-speed signal lines  The traces should be as short as possible  Keep SIM card holder’s GND connect to main ground directly  Shielding the SIM card signal by ground well  Recommended to place a 100nF capacitor on SIM_VDD line and keep close to the SIM card holder  Add some TVS which parasitic capacitance should not exceed 50pF  Add 51Ω resistor to (SIM_RST/SIM_CLK/SIM_DATA) signal could enhance ESD protection  Add 22pf capacitors to (SIM_RST/SIM_CLK/SIM_DATA) signal to reduce RF interference
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 37 2016-06-20 4.8.3. Design Considerations for SIM Card Holder For 8 pins SIM card holder, SIMCom recommends to use Molex 91228.Customer can visit http://www.molex.com for more information about the holder. Figure 32: Molex 91228 SIM card holder Table 18: Pin description (Molex SIM card holder) Pin name Signal Description C1 SIM_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 C7 SIM_DATA SIM card data I/O C8 SIM_DET Detect SIM card presence
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 38 2016-06-20 For 6-pin SIM card holder, SIMCom recommends to use Amphenol C707 10M006 512 .Customer can visit http://www.amphenol.com for more information about the holder. Figure 33: Amphenol C707 10M006 512 SIM card holder Table 19: Pin description (Amphenol SIM card holder) Pin name Signal Description C1 SIM_VDD SIM card power supply C2 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 Note: Every time plug SIM card interval advice is greater than 2s. Otherwise may not be able to correct detection.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 39 2016-06-20 4.9. SD Interface SD interface can be configured as PCM interface; the following table shows the detailed multiplexing function. Table 20: SD multiplexing function Pin name Pin number Mode 0(default) Mode 1 Mode 2 Mode 3 MCCA3 46 MCCA3 DAIPCMOUT(1.8V) GPIO EINT19 MCCA2 47 MCCA2 DAICLK(1.8v) GPIO EINT18 MCCA1 48 MCCA1 DAIPCMIN(1.8v) GPIO EINT17 MCCA0 49 MCCA0 DAISYNC (1.8v) GPIO MCCK 50 MCCK GPIO MCCM0 51 MCCM0 GPIO Note: Customer can use AT command set mode. For detail, please refer to document [1]. SIM868 provides a hardware SD interface: Figure 34: SD reference circuit If power supply is 2.8V for SD card, customer can use VDD_EXT; if power supply is 3.3V, please use external design LDO. 4.10. I2C Bus The SIM868 provides an I2C interface which is only used in the embedded AT application. Table 21: Pin definition of the I2C Note: 1. I2C should be pulled up to 2.8V via 4.7K externally. 2. I2C function is not supported in the standard firmware. If you need, please contact SIMCom. 4.10.1. I2C Multiplexing Function Table 22: I2C multiplexing function Pin name Pin number Description SCL 65 I2C serial bus clock(open drain output) SDA 64 I2C serial bus data(open drain output)
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 40 2016-06-20 Pin name Pin number Mode 0(default) Mode 1 SCL 65 SCL GPIO SDA 64 SDA GPIO Note: Customer can use AT command set mode. For detail, please refer to document t[1]. 4.11. ADC Table 23: Pin definition of the ADC SIM868 provides an auxiliary ADC, which can be used to measure the voltage. Customer can use AT command “AT+CADC” to read the voltage value. Note: Customer can use AT command set mode. For detail, please refer to document t[1]. Table 24: ADC specification Parameter Min Typ Max Unit Voltage range 0 - 2.8 V ADC Resolution - 10 - bits RIN Input resistance Unselected channel Selected channel 400 1 M M CIN Input capacitance Unselected channel Selected channel 50 4 fF pF Sampling rate - - 1.08 MHz ADC precision 10 30 mV 4.12. Network Status Indication Table 25: Pin definition of the NETLIGHT The NETLIGHT pin can be used to drive a network status indication LED. The status of this pin is listed in following table: Table 26: Status of the NETLIGHT pin Status SIM868 behavior Off Powered off 64ms On/ 800ms Off Not registered the network 64ms On/ 3000ms Off Registered to the network 64ms On/ 300ms Off GPRS communication is established Pin name Pin number Description ADC 38 Analog voltage input Pin name Pin number Description NETLIGHT 41 Network Status Indication
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 41 2016-06-20 Reference circuit is recommended in the following figure: ModuleNETLIGHTVBAT4.7K47KR Figure 35: Reference circuit of NETLIGHT Table 27: NETLIGHT multiplexing function Pin name Pin number Mode 0(default) Mode 1 NETLIGHT 41 NETLIGHT GPIO Note: Customer can use AT command set mode. For detail, please refer to document t[1]. 4.13. Operating Status Indication The pin42 is for operating status indication of the module. The pin output is high when module is powered on, and output is low when module is powered off. Table 28: Pin definition of the STATUS Pin name Pin number Description STATUS 42 Operating status indication Note: For timing about STATUS, please reference to the chapter “4.2 power on/down scenarios” 4.14. RF Synchronization Signal The synchronization signal serves to indicate growing power consumption during the transmit burst. Table 29: Definition of the RF_SYNC pin The timing of the synchronization signal is shown in the following figure. High level of the RF_SYNC signal indicates increased power consumption during transmission. Pin name Pin number Description RF_SYNC 29 Transmit synchronization signal
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 42 2016-06-20 Transmit burstRF_SYNC577us220us Figure 36: RF_SYNC signal during transmit burst 4.14.1. RF_SYNC Multiplexing Function RF_SYNC can also be used as GPIO to indicate the RF Jamming. The RF_SYNC function and RF Jamming Detection function can be switched by AT+SJDR command. Table 30: RF_SYNC Multiplexing function Pin name Pin number Mode 0(default) Mode 1 RF_SYNC 29 RF Synchronization Signal JD（RF jamming detection） Note: About AT+SJDR, please refer to document [1]. 4.15. GNSS 4.15.1. GNSS Overview SIM868 provide a high-performance L1 GNSS solution for cellular handset applications. The solution offers best-in-class acquisition and tracking sensitivity, Time-To-First-Fix (TTFF) and accuracy. The GNSS engine supports both fully-autonomous operations for use in handheld consumer navigation devices and other standalone navigation systems. GNSS engine Performance, please refer to Table 3. GNSS NMEA information is output by serial port. The default baud rate is 115200bps. 4.15.2. Power on/down GNSS The GNSS engine is controlled by GNSS_EN PIN, so when it is necessary to run GNSS，the GNSS_EN must be pulled up to 2.8V. When it is necessary to power off GNSS，the GNSS_EN must be pulled down to GND. 4.15.3. 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. 4.16. Antenna Interface There are two antenna interfaces, GSM_ANT、GPS_ANT.  The input impendence of the two antenna should be 50Ω, and the VSWR should be less than 2.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 43 2016-06-20  It is recommended that the GSM antenna should be placed as far as possible.  The isolations of the two antenna should be bigger than 30dB  The modular connection to the antenna is made through a host’s printed board microstrip trace layout,the impendence of the microstrip trace is control in 50Ω，the series connection component in the trace is 0Ω resistors for default, the size of series connection componentcan be 0402 or 0201.the length of the microstrip trace should be as short as possible for reduce insertion loss. 4.16.1. GSM Antenna Interface There is a GSM antenna pad named GSM_ANT to connect an external GSM antenna, the connection of the antenna must be decoupled from DC voltage. This is necessary because the antenna connector is DC coupled to ground via an inductor for ESD protection. The external antenna must be matched properly to achieve the best performance, so the matching circuit is necessary. It is recommended to reserve the matching circuit as following: Figure 37: GSM antenna matching circuit The RF connector is used for conduction test. If the space between RF pin and antenna is not enough, the matching circuit should be designed as in the following figure: Figure 38: GSM antenna matching circuit without RF connector In above figure, the components R101, C101 and C102 are used for antenna matching, the value of components can only be got after the antenna tuning, usually, they are provided by antenna vendor. By default, the R101 is 0Ω resistors, and the C101, C102 are reserved for tuning.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 44 2016-06-20 Dipole Antenna Reference PCBLayout Requirements. Dipole Antenna Reference Design PCB Mount these devices with brown mark facing up. Units: mm Line width should be designed to provide 50Ωimpedance matching characteristics.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 45 2016-06-20
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 46 2016-06-20 The RF test connector in the figure is used for the conducted RF performance test, and should be placed as close as to the module’s antenna pin. The traces impedance between components must be controlled in 50Ω. The component D101 is a bidirectional TVS component, which is used for ESD protection, the recommended part numbers of the TVS are listed in the following table: Table 31: Recommended TVS component Package Type Supplier 0201 LXES03AAA1-098 Murata 0201 LXES03AAA1-154 Murata 0402 LXES15AAA1-153 Murata 0402 LXES15AAA1-100 Murata 0402 LXES15AAA1-017 Murata 4.16.2. GNSS Antenna Interface The module also provides a GNSS antenna interface named GPS_ANT to connect the antenna on the customer’s application board. To obtain excellent GNSS reception performance, a good antenna will always be required. Proper choice and placement of the antenna will ensure that satellites at all elevations can be seen, and therefore, accurate fix measurements are obtained. There are two normal options: passive antenna and active antenna. 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. SIM868 provides GSM antenna named GSM_ANT, customer could use 50Ω microstrip line or stripline antenna connect to the module. The maximum gain of the Main antenna gain should not exceed 3dBi considering the SAR radio. No antenna gain may be used that would exceed the 2W EIRP power limit in 1900MHz band。
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 47 2016-06-20 It have according to reference trace and matching circuit testing all FCC items,and all items satisfy FCC requirements.Only the reference trace and matching circuit is certified, antenna design must refer to it, any other deviations require testing Class II applications as required by FCC. The certified matching circuit as following: The external antenna must be matched properly to achieve best performance, so the matching circuit is necessary, the connection is recommended as the following figure: Figure 39: GNSS passive antenna matching circuit The components R101, C101 and C102 are used for antenna matching, the components’ value only can be got after the antenna tuning. Normally R101 is 0Ω, C101 and C102 are not mounted. Figure 40: GNSS active antenna matching circuit Active antennas have an integrated Low-Noise Amplifier (LNA). VCC_ANT is needed on customer’s application board for the active antenna power input, as shown in Figure 40. The inductor L101 is used to prevent the RF signal from leaking into the VCC_ANT pass and route the bias supply to the active antenna, the recommended value of L101 is no less than 27nH. R102 can protect the whole circuit in case the active antenna is shorted to ground.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 48 2016-06-20 5. PCB Layout This section will give some guidelines on PCB layout, in order to eliminate interfere or noise. 5.1 Pin Assignment Before PCB layout, we should learn about pin assignment in order to get reasonable layout with so many external components. Following figure is the overview of pin assignment of the module. Figure 41: PIN assignment
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 49 2016-06-20 5.2 Principle of PCB Layout During layout, attention should be paid to the following interfaces, like Antenna, power supply, SIM card interface, audio interface, and so on. 5.2.1 Antenna Interface  The length of trace between pin output and connector should be as short as possible;  Do not trace RF signal over across the board;  The RF signal should be far away from SIM card, power ICs. 5.2.2 Power Supply  VBAT and return GND are very important in layout;  The positive line of VBAT should be as short and wide as possible;  The correct flow from source to VBAT pin should go though Zener diode then huge capacitor;  Pin 36 and Pin37 are GND signals, and shortest layout to GND of power source should be designed;  There are 23 GND pads in the module; these pads could enhance the GND performances. On the upper layer of these pads, do not trace any signal if possible. 5.2.3 SIM Card Interface  SIM card holder has no anti-EMI component inside. Thus SIM card interface maybe interfered, please pay more attention on this interface during layout;  Ensure SIM card holder is far way from antenna or RF cable inside;  Put SIM card holder near the module, as nearer as possible;  Add ESD component to protect SIM_CLK, SIM_DATA, SIM_RST and SIM_VDD signals which should be far away from power and high-speed-frequency signal. 5.2.4 Audio Interface  The signal trace of audio should far away from antenna and power;  The audio signal should avoid to parallel with VBAT trace. 5.2.5 Others  It is better to trace signal lines of UART bunched, as well as signals of USB.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 50 2016-06-20 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 SIM868. Table 32: Absolute maximum ratings Symbol Min Typ Max Unit VBAT - - 4.5 V Current 0 - 2.0 A USB_VBUS - - 7 V II* - 4 16 mA IO* - 4 16 mA These parameters are for digital interface pins, GPIO, and UART. 6.2 Recommended Operating Conditions Table 33: Recommended operating conditions Symbol Parameter Min Typ Max Unit VBAT Power supply voltage 3.4 4.0 4.4 V TOPER Operating temperature -40 +25 +85 ℃ TSTG Storage temperature -45 +90 ℃ 6.3 Digital Interface Characteristics Table 34: Digital interface characteristics Symbol Parameter Min Typ Max Unit VIH High-level input voltage 2.1 - 3.1 V VIL Low-level input voltage -0.3 - 0.7 V VOH High-level output voltage 2.4 - - V VOL Low-level output voltage - - 0.4 V Note: These parameters are for digital interface pins, such as keypad, GPIO and UART. 6.4 SIM Card Interface Characteristics Table 35: SIM card interface characteristics Symbol Parameter Min Typ Max Unit IIH High-level input current -1.0 - 1.0 uA IIL Low-level input current -1.0 - 1.0 uA
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 51 2016-06-20 VIH High-level input voltage 1.4 - - V 2.4 - - V VIL Low-level input voltage - - 0.27 V 0.4 V VOH High-level output voltage 1.62 - - V 2.7 - - V VOL Low-level output voltage - - 0.36 V - - 0.4 V 6.5 SIM_VDD Characteristics Table 36: SIM_VDD characteristics Symbol Parameter Min Typ Max Unit VO Output voltage - 3.0 - V - 1.8 - IO Output current - - 10 mA 6.6 VDD_EXT Characteristics Table 37: VDD_EXT characteristics Symbol Parameter Min Typ Max Unit VO Output voltage 2.7 2.8 2.9 V IO Output current - - 50 mA 6.7 Current Consumption（VBAT=4.0V） Table 38: Current consumption Symbol Parameter Conditions Min Typ Max Unit VBAT Voltage 4.0 V Power drop PCL=5 350 mV Voltage ripple PCL=5 @ f<200kHz @ f>200kHzss 50 2.0 mV mV IVBAT Average current Power off mode 130 150 uA Sleep mode (AT+CFUN=1)： ( BS-PA-MFRMS=9 ) ( BS-PA-MFRMS=5) ( BS-PA-MFRMS=2) 0.86 1.02 1.42 mA mA mA Idle mode (AT+CFUN=1)： GSM850 EGSM900 DCS1800 13.7 13.7 13.7 mA mA mA
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 52 2016-06-20 PCS1900 13.7 mA Voice call (PCL=5)： GSM850 EGSM900 Voice call (PCL=0)： DCS1800 PCS1900 223 234 162 170 mA mA mA mA Data mode GPRS (1Rx,4Tx)： GSM850 EGSM900 DCS1800 PCS1900 378 414 270 308 mA mA mA mA Data mode GPRS (3Rx,2Tx)： GSM850 EGSM900 DCS1800 PCS1900 323 340 212 236 mA mA mA mA Data mode GPRS (4Rx,1Tx)： GSM850 EGSM900 DCS1800 PCS1900 217 223 153 163 mA mA mA mA IMAX Peak current During Tx burst 2.0 A Note: 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. 6.8 Electro-Static Discharge SIM868 is an ESD sensitive component, so attention should be paid to the procedure of handling and packaging. The ESD test results are shown in the following table. Table 39: The ESD characteristics (Temperature: 25℃, Humidity: 45 %) Pin name Contact discharge Air discharge VBAT ±5KV ±10KV GND ±5KV ±10KV UART1_TXD /UART1_RXD ±4KV ±8KV Antenna port ±5KV ±10KV SPKP/SPKN/MICP/MICN ±4KV ±8KV PWRKEY ±4KV ±8KV 6.9 Radio Characteristics 6.9.1 Module RF Output Power The following table shows the module conducted output power, it is followed by the 3GPP TS 05.05 technical
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 53 2016-06-20 specification requirement. Table 40: GSM850 and EGSM900 conducted RF output power GSM850,EGSM900 PCL Nominal output power (dBm) Tolerance (dB) for conditions Normal Extreme 5 33 ±2 ±2.5 6 31 ±3 ±4 7 29 ±3 ±4 8 27 ±3 ±4 9 25 ±3 ±4 10 23 ±3 ±4 11 21 ±3 ±4 12 19 ±3 ±4 13 17 ±3 ±4 14 15 ±3 ±4 15 13 ±3 ±4 16 11 ±5 ±6 17 9 ±5 ±6 18 7 ±5 ±6 19-31 5 ±5 ±6 Table 41: DCS1800 and PCS1900 conducted RF output power DCS1800,PCS1900 PCL Nominal output power (dBm) Tolerance (dB) for conditions Normal Extreme 0 30 ±2 ±2.5 1 28 ±3 ±4 2 26 ±3 ±4 3 24 ±3 ±4 4 22 ±3 ±4 5 20 ±3 ±4 6 18 ±3 ±4 7 16 ±3 ±4 8 14 ±3 ±4 9 12 ±4 ±5 10 10 ±4 ±5 11 8 ±4 ±5 12 6 ±4 ±5 13 4 ±4 ±5
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 54 2016-06-20 14 2 ±5 ±6 15 0 ±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 module’s 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, so the module’s output power should not exceed 30dBm, and at the maximum power level, the output power tolerance should not exceed +/-2dB under normal condition and +/-2.5dB under extreme condition. 6.9.2 Module RF Receive Sensitivity The following table shows the module’s conducted receiving sensitivity, it is tested under static condition. Table 42: Conducted RF receive sensitivity Frequency Receive sensitivity（Typical） Receive sensitivity(Max) GSM850,EGSM900 < -109dBm < -107dBm DCS1800,PCS1900 < -109dBm < -107dBm 6.9.3 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 43: Operating frequencies Frequency Receive Transmit GSM850 869 ～ 894MHz 824 ～ 849MHz EGSM900 925 ～ 960MHz 880 ～ 915MHz DCS1800 1805 ～ 1880MHz 1710 ～ 1785MHz PCS1900 1930 ～ 1990MHz 1850 ～ 1910MHz
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 55 2016-06-20 7. Manufacturing 7.1. Top and Bottom View of SIM868 Figure 42: Top and bottom view of SIM868 7.2. Typical Solder Reflow Profile Figure 43: Typical solder reflow profile of lead-free process 7.3. The Moisture Sensitivity Level The moisture sensitivity level of SIM868 module is 3. The modules should be mounted within 168 hours after unpacking in the environmental conditions of temperature <30℃ and relative humidity of <60% (RH). It is necessary to bake the module if the above conditions are not met:
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 56 2016-06-20 Table 44: Moisture sensitivity level and floor life Moisture Sensitivity Level (MSL) Floor Life (out of bag) at factory ambient≤30°C/60% RH or as stated 1 Unlimited at ≦30℃/85% RH 2 1 year 2a 4 weeks 3 168 hours 4 72 hours 5 48 hours 5a 24 hours 6 Mandatory bake before use. After bake, it must be reflowed within the time limit specified on the label. NOTES: 1. If the vacuum package is not open for 3 months or longer than the packing date, baking is also recommended before re-flow soldering. 2. For product handling, storage, processing, IPC / JEDEC J-STD-033 must be followed. 7.4. Baking Requirements SIM868 modules are vacuum packaged, and guaranteed for 6 months storage without opening or leakage under the following conditions: the environment temperature is lower than 40℃, and the air humidity is less than 90%. If the condition meets one of the following ones shown below, the modules should be baked sufficiently before re-flow soldering, and the baking condition is shown in below table; otherwise the module will be at the risk of permanent damage during re-flow soldering.  If the vacuum package is broken or leakage;  If the vacuum package is opened after 6 months since it’s been packed;  If the vacuum package is opened within 6 months but out of its Floor Life at factory ambient≦30℃/60%RH or as stated. Table 45: Baking requirements Baking temperature Moisture Time 40℃±5℃ <5% 192 hours 120℃±5℃ <5% 4 hours Note: Care should be taken if that plastic tray is not heat-resistant, the modules should be taken out for preheating, otherwise the tray may be damaged by high-temperature heating.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 57 2016-06-20 8. Appendix I. Related Documents Table 46: Related documents SN Document name Remark [1] SIM800_Series_AT_Command_Manual [2] SIM800 Series Port Application Note_V1 02.doc [3] ITU-T Draft new recommendation V.25ter： Serial asynchronous automatic dialing and control [4] GSM 07.07： Digital cellular telecommunications (Phase 2+); AT command set for GSM Mobile Equipment (ME) [5] GSM 07.10： Support GSM 07.10 multiplexing protocol [6] GSM 07.05： 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) [7] GSM 11.14： Digital cellular telecommunications system (Phase 2+); Specification of the SIM Application Toolkit for the Subscriber Identity Module – Mobile Equipment (SIM – ME) interface [8] GSM 11.11： Digital cellular telecommunications system (Phase 2+); Specification of the Subscriber Identity Module – Mobile Equipment (SIM – ME) interface [9] GSM 03.38： Digital cellular telecommunications system (Phase 2+); Alphabets and language-specific information [10] GSM 11.10 Digital cellular telecommunications system (Phase 2)； Mobile Station (MS) conformance specification； Part 1： Conformance specification [11] AN_Serial Port AN_Serial Port [12] SIM868_GNSS_Application Note
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 58 2016-06-20 II. Multiplexing Function Table 47: Multiplexing function Pin name Reset Pin number Mode 0(default) Mode 1 Mode 2 Mode 3 SIM1_DET I/PD 14 SIM1_DET GPIO EINT14 SIM2_DET I/PD 52 SIM2_DET GPIO EINT16 NETLIGHT I/PD 41 NETLIGHT GPIO UTXD UART1_DTR I/PD 6 UART1_DTR GPIO EINT13 UART1_RI I/PD 7 UART1_RI GPIO EINT11 UART1_DCD I/PD 5 UART1_DCD GPIO URXD UART1_CTS I/PD 4 UART1_CTS GPIO EINT12 UART1_RTS I/PD 3 UART1_RTS GPIO MCCA3 I/PD 46 MCCA3 DAIPCMOUT(1.8V) GPIO EINT19 MCCA2 I/PD 47 MCCA2 DAICLK(1.8v) GPIO EINT18 MCCA1 I/PD 48 MCCA1 DAIPCMIN(1.8v) GPIO EINT17 MCCA0 I/PD 49 MCCA0 DAISYNC (1.8v) GPIO MCCK I/PD 50 MCCK GPIO MCCM0 I/PD 51 MCCM0 GPIO Note: Multiplexing function need different software supply. III. Terms and Abbreviations Table 48: Terms and abbreviations Abbreviation Description ADC Analog-to-Digital Converter AMR Adaptive Multi-Rate CS Coding Scheme CTS Clear to Send DTE Data Terminal Equipment (typically computer, terminal, printer) DTR Data Terminal Ready DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM ESD Electrostatic Discharge ETS European Telecommunication Standard FR Full Rate GPRS General Packet Radio Service GSM Global Standard for Mobile Communications HR Half Rate MO Mobile Originated MS Mobile Station (GSM engine), also referred to as TE MT Mobile Terminated
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 59 2016-06-20 PAP Password Authentication Protocol PBCCH Packet Broadcast Control Channel PCB Printed Circuit Board PCL Power Control Level PCS Personal Communication System, also referred to as GSM 1900 PDU Protocol Data Unit PPP Point-to-point protocol RF Radio Frequency RMS Root Mean Square (value) RX Receive Direction SIM Subscriber Identification Module SMS Short Message Service TE Terminal Equipment, also referred to as DTE TX Transmit Direction SINAD Signal to Noise and Distortion Ratio UART Universal Asynchronous Receiver & Transmitter URC Unsolicited Result Code USSD Unstructured Supplementary Service Data Phonebook abbreviations FD SIM fix dialing phonebook LD SIM last dialing phonebook (list of numbers most recently dialed) MC Mobile Equipment list of unanswered MT calls (missed calls) ON SIM (or ME) own numbers (MSISDNs) list RC Mobile Equipment list of received calls SM SIM phonebook NC Not connect
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 60 2016-06-20 IV. Safety Caution Table 49: Safety caution Marks Requirements When in a hospital or other health care facility, observe the restrictions about the use of mobiles. Switch the cellular terminal or mobile off, medical equipment may be sensitive to not operate normally for RF energy interference. Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is switched off. The operation of wireless appliances in an aircraft is forbidden to prevent interference with communication systems. Forget to think much of these instructions may lead to the flight safety or offend against local legal action, or both. Do not operate the cellular terminal or mobile in the presence of flammable gases or fumes. Switch off the cellular terminal when you are near petrol stations, fuel depots, chemical plants or where blasting operations are in progress. Operation of any electrical equipment in potentially explosive atmospheres can constitute a safety hazard. Your cellular terminal or mobile receives and transmits radio frequency energy while switched on. RF interference can occur if it is used close to TV sets, radios, computers or other electric equipment. Road safety comes first! Do not use a hand-held cellular terminal or mobile when driving a vehicle, unless it is securely mounted in a holder for hands free operation. Before making a call with a hand-held terminal or mobile, park the vehicle. GSM cellular terminals or mobiles operate over radio frequency signals and cellular networks and cannot be guaranteed to connect in all conditions, for example no mobile fee or a invalid SIM card. While you are in this condition and need emergent help, please remember using emergency calls. In order to make or receive calls, the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength. Some networks do not allow for emergency call if certain network services or phone features are in use (e.g. lock functions, fixed dialing etc.). You may have to deactivate those features before you can make an emergency call. Also, some networks require that a valid SIM card be properly inserted in the cellular terminal or mobile.
Smart Machine Smart Decision SIM868_Hardware_Design_V1.00 61 2016-06-20 Contact us: Shanghai SIMCom Wireless Solutions Co.,Ltd. Address: Building A, SIM Technology Building, No. 633, Jinzhong Road, Shanghai, P. R. China 200335 Tel: +86 21 3252 3300 Fax: +86 21 3252 3020 URL: www.sim.com/wm

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