SIM800F Hardware Design Guide - MT
Contents
1. 46 4 20 Antenna Interia ERR ERE RR RES ERR RESET Ee RE e Ee 46 4 20 1 GSM Antenna 47 4 20 2 Bluetooth Antenna Interface esee IRE e RE ER CERE EN XR XR Rede 48 S 49 5 1 IS e P 49 5 2 Principle of PCB Layout eese eterne ee 50 RP P HP Hn 50 5 2 3 tite E 50 5 2 3 SIM Card Interface eene rennen 50 zot Ando 50 OET MEE 50 6 Electrical Reliability and Radio Characteristics e seeseesoesoesossossossoesossossossossossoesossossossossossossossossessossossee 51 6 1 Absolute Maximum Ratings user eite tret eek eere 5 6 2 Recommended Operating 51 6 3 Digital Interface Characteristics o ciet otetato ne HB GIONE 5 6 4 SIM Card Interface Characteristics ccccccssccsseccssecesseeeseseeesseecsseecnsnecseeeeseneeesseeseaeeeseecsenseseeeeeneeensaees 51 6 5 SIM VDD CharacteristiCs ees2. 3 6 Figure Index qem 8 Version HistOry 10 EB ODIIMPEP D 1 2 STMB800F 11 2 1 SIMS00E Key Eeat res e nn RP A IIS 22 Operating Modes 41 2 000 0000000000000000000000000000000000000000 13 2 3 SIM800F Functional Diagram d e ee d eee dee eed 14 3 Package Information P 15 3 1 Pan 15 3 2 Pin 16 3 3 c E 18 4 Application 55555 20 4 1 uode 20 B wer Supply PIS Les Suede edo RUNS Re deri 22 4 1 2 Monitoring Power Supply 20 stint thee
3. company of SIM Tech SIMS00F Hardware Design V1 00 Smart Machine Smart Decision 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 are 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 2015 SIM800F_Hardware Design_V1 00 2 2015 07 31 E Qoe Smart Machine Smart Decision Contents Glue
4. 22 4 2 Power on off MRRRRRRREEEEEEEEEMEMMMMMM 22 42L Power0nSIMB00k beein ieee EEEE EEE ERER 22 422 23 4 2 3 Restart SIM800F by 25 43 Reset aR a aaiae 25 4 4 Power Saving HM 26 441 Minimum Functionality 26 442 Sleep Mode 1 ATHCSCLK A1 27 443 Wake Up SIM800F from Sleep Mode 1 27 444 Sleep Mode 2 AT CSCLI A 27 4 4 5 Wake Up SIM800F from Sleep Mode 2 2 27 4 5 ee Hien eee 28 4 6 Serial Port and USB 29 4 6 1 Function of Serial ec ceceescceseeseesseeeseeeeeeseesseesseeesceesceseesseeseeeseeceseeeceeceeseeeeseeesneesneeseeeeaes 29 4 6 2 Serial Port 30 4 6 3 USB Interface aiiis 32 4 6 4 Software Upgrading and 32 4 7 octiaceiccisacessesaseitecsdacasecsazcateesiacesacsancanscsaactecnsageanseauisadaseaeaaactsasstavesass cau ERES ISEUS 33 4 8 Audo 34
5. Figure 43 GSM antenna matching circuit without connector Normally R101 is 0Q C101 and C102 are not mounted SIM800F_ Hardware Design V1 00 47 2015 07 31 E Qoe 06 Smart Machine Smart Decision 4 20 2 Bluetooth Antenna Interface For Bluetooth antenna it is recommended to reserve the matching circuit as following BT Module Ro puts BT ANT C201 C202 GND Pin54 Figure 44 Bluetooth antenna matching circuit R201 C201 C202 are the matching circuit the values depend on antenna debug result Normally R201 is 00 C201 and C202 are not mounted There are some suggestions for placing components and RF trace for GSM ANT BT ANT The RF connector is used for conducted test so keep it as close to pin GSM as possible Antenna matching circuit should be close to the antenna Keepthe RF traces impedance as 50 2 The RF traces should be kept far away from the high frequency signals and strong interference Source SIMS800F Hardware Design V1 00 48 2015 07 31 3 tone 5 PCB Layout Smart Machine Smart Decision Usually most electronic products with good performance are based on good PCB layout Poor PCB layout will lead to lots of issues like TDD noise SIM card undetected etc The final solution for these problems is to redo PCB layout Making good PCB layout will save developing schedule and cost
6. eerte tette 36 TABLE 14 AUDIO OUTPUT CHARACTERISTICS EE Ma e nnn n EUR UR ERRORI 36 TABLE 15 SIM PIN DEFINITION eterne tette tette tte tette 37 TABLE 16 PIN DESCRIPTION MOLEX SIM CARD HOLDER 38 TABLE 17 PIN DESCRIPTION AMPHENOL SIM CARD HOLDER cens 39 TABLE 18 PIN DEFINITION OF DISP INTERFACE eerte tentent 40 TABLE 19 DISP MULTIPLEXING FUNCTION rtt ttt ttt 40 TABLE 20 PIN DEFINITION OF THE KEYPAD INTERFACE eet ttt ttn 40 TABLE 21 PIN DEFINITION OF THE GPIO eerte tette ttt ttes 4l TABLE 22 GPIO11 MULTIPLEXING FUNCTION scssssssscossrsssrsssrossrssorsssrssorsvsrsvsrsscrsvorsecrsscenssenssenesenssenssesvorsvorses 42 TABLE 23 PIN DEFINITION OF UART2_ 2 2222 2 22 00 821000000000 42 TABLE 24 PIN DEFINITION OF THE DC tentent ttn E tenter tette 43 TABLE 25 I2C MULTIPLEX FUNCTION Rc be ett 43 TABLE 26 PIN DEFINITION OE ADC 43 TABLE 27 ADC SPECIFICATION ccssesssssssssssssssssssscsssssssscssscsssscsssscssusssssccsssesssscssuscssessssecsssuccsssesssecsssessssessuessesseseeeses 43 TABLE 28 PIN DEFINITION OF THE STATUS treten ttt tette tenentis 44 TABLE 29 STATUS OF THE NETLIGHT PIN eet 44 TABLE 30 NETLIGHT MULTIPLEX FUNCTION ce
7. default setting is auto baud detection Serial port UART2 Support AT command SIM800F Hardware Design V1 00 29 2015 07 31 2 E 4 Smart Machine Smart Decision Serial port supports the following baud rates 1200 2400 4800 9600 19200 38400 57600 and 115200bps The default setting is auto baud detection Auto baud detection allows SIM800F to detect the baud rate of host device automatically Pay more attention to the following requirements Synchronization between DTE and DCE When DCE powers on with auto baud detection enabled firstly users must send character or to synchronize the baud rate It is recommended to send AT until DTE receives the response which means DTE and DCE are correctly synchronized For more information please refer to the AT command Restrictions of auto baud detection The DTE serial port must be set at 8 data bits no parity bit and 1 stop bit The URC such as RDY CFUN 1 and READY will not be reported Note User can use AT command AT IPR x to set a fixed baud rate and the setting will be saved to non volatile flash memory automatically After the configuration is set as fixed baud rate the URC such as RDY CFUN 1 and CPIN READY will be reported when SIM800F is powered on 4 6 2 Serial Port Connection The following figure shows the connection between module side D
8. DISP_CLK Display clock DISP_DATA 12 Display data DISP_D C 13 Data command select DISP_CS 14 Chip select For the connection between LCD and SIM800F module please refer to below figure SPI CS gt O SPI gt C SPI DISP DATA Q OSPI DATA Bs GND Module LCD Figure 36 Connection of DISP interface It could also be used as other function in some applications Table 19 DISP Multiplexing function DISP_CLK 11 GPIO DISP CLK SPI CLK PCM IN DISP DATA 12 GPIO DISP DATA SPI MOSI PCM OUT DISP D C 13 GPIO DISP D C SPI MISO PCM SYNC DISP CS 14 GPIO DISP_CS SPI CS PCM CLK Note These functions are not supported in the standard firmware If you need please contact SIMCom 4 11 Keypad Interface The keypad interface consists of 5 keypad column outputs and 4 keypad row inputs supports total 20 keys Table 20 Pin definition of the keypad interface KBR4 GPIO KBR4 KBR3 41 GPIO KBR3 KBR2 42 GPIO KBR2 SIM800F_Hardware Design_V1 00 40 2015 07 31 Smart Machine Smart Decision 43 GPIO KBRI 44 GPIO 0 47 GPIO KBC4 48 GPIO KBC3 49 GPIO KBC2 50 GPIO KBC1 KBC2 t KBC3 i 4 KBRO i 9 KBR1C 3 KBR2 i i KBR3 i i i Figure 37 Reference circuit of the keypad interface Note keypad function is not supported in the standard firm
9. IV o m Smart Machine Smart Decision T rms and Abbreviations case iic IIR 61 Safety Caution SIMS800F Hardware Design V1 00 5 2015 07 31 E Qoe Smart Machine Smart Decision Table Index TABLE 1 SIMBOOR KEY FEATURES 11 TABLE 2 CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE e 13 TABLE 3 OVERVIEW OF OPERATING MODBES cette 13 TABLE 4 PIN DESCRIPTION 16 TABLE 5 RECOMMENDED ZENER 04444 810 21 TABLE 6 ELECTRONIC CHARACTERISTIC OF THE RESET 26 TABLE 7 CURRENT CONSUMPTION OF MINIMUM FUNCTIONALITY MODE ees 27 TABLE 8 SERIAL PORT AND USB PIN DEFINITION eee tentent treten tenentis 29 TABLE 9 SERIAL PORT CHARACTERISTICS eee tette tette tette tnit 29 TABLE 10 VBUSTHARACTERISTICS oe 32 TABLE 11 RI BEHAVIORS 33 TABLE 12 AUDIO INTERFACE DEFINITION ccccssscsssessssesssessvessvecssecssscssecssecssscssecsrecssecssscssecssecssecssecssesavesseesssecases 34 TABLE 13 MICROPHONE INPUT CHARACTERISTICS
10. 30 FIGURE 21 LEVEL CONVERTING BY 31 FIGURE 22 LEVEL CONVERTING BY 5 ERES SKIT EEES iS 31 FIGURE 23 TX LEVEL CONVERTING BY TRANSISTOR 31 FIGURE 24 RX LEVEL CONVERTING BY TRANSISTOR 32 FIGURE 25 USB REFERENCE CIRCUIT 2 etre rtt 32 FIGURE 26 CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING THROUGH UART 33 FIGURE 27 RI BEHAVIOUR OF VOICE CALLING AS A eee eene 34 FIGURE 28 RI BEHAVIOUR OF URC OR RECEIVE 5 enne 34 FIGURE 29 RI BEHAVIOUR AS A CALLER eee een eene 34 EIGURE 30 SPEAKER REFERENCE CIRCUIT ettet ertet enn 35 FIGURE 31 MICROPHONE REFERENCE CIRCUIT e eene eterne tnn tein tatit 35 FIGURE 32 REFERENCE CIRCUIT OF THE 8 PIN SIM CARD eee ee 37 FIGURE 33 REFERENCE CIRCUIT OF THE 6 PIN SIM CARD 37 FIGURE 34 MOLEX 91228 SIM CARD HOLDER esee eere rennen eerte trennen trennen enne 38 FIGURE 35 AMPHENOL C707 10 006 5122 SIM CARD 39 FIGURE 36 CONNECTION OF DISP three teinte 40 FIGU
11. DC BUS The SIM800F provides an I2C interface which supports the master role and conforms to the I2C specification The features of I2C interface are listed as below Compliant master mode operation Adjustable clock speed for F S mode operation Support 7 bit 10 bit addressing SIM800F Hardware Design V1 00 42 2015 07 31 E Qoe Smart Machine Smart Decision Support high speed mode Support slave clock extension START STOP REPEATED condition Manual transfer mode Multi bytes write per transfer up to 8 data bytes for non DMA mode Multi bytes read per transfer up to 8 data bytes for non DMA mode Multi transfer per transaction Combined format transfer with length change capability Active drive write and I O configuration Table 24 Pin definition of the IZC SDA I2C bus data SCL 38 bus clock Note 1 I2C has been pulled up to 2 8V via 4 7KQ internally 2 DPC function is not supported in the standard firmware If you need please contact SIMCom Table 25 12 multiplex function SD GPIO SD SCL 38 GPIO SCL 4 14 ADC Table 26 Pin definition of ADC Analog to digital converter SIM800F provides an auxiliary ADC which can be used to measure the voltage Users can use AT command to read the voltage value For details about this AT command please refer to document Table 27 ADC specification Voltage range ADC Resolution 10 bits Sampling
12. Equipment SIM ME interface Digital cellular telecommunications system Phase 2 Specification of the Subscriber Identity Module Mobile Equipment SIM ME interface Digital cellular telecommunications system Phase 2 Alphabets and language specific information Digital cellular telecommunications system Phase 2 Mobile Station MS conformance specification Part 1 Conformance specification AN Serial Port TCP IP Applications User Manual 59 2015 07 31 Smart Machine Smart Decision II Multiplex Function Table 54 Multiplex Function 2015 07 31 60 gn 1 00 51 800 Hardware Desi Smart Machine Smart Decision Terms and Abbreviations Table 55 Terms and Abbreviations Abbreviation ADC AMR BT CS CSD CTS DTE DTR DTX EFR EGSM ESD ETS FR GPRS GSM HR IMEI Li ion MO MS MT PAP PBCCH PCB PCL PCS PDU PPP RF RMS RTC RX SIM SMS TDD Description Analog to Digital Converter Adaptive Multi Rate Bluetooth Coding Scheme Circuit Switched Data Clear to Send Data Terminal Equipment typically computer terminal printer Data Terminal Ready Discontinuous Transmission Enhanced Full Rate Enhanced GSM Electrostatic Discharge European Telecommunication Standard Full Rate General Packet Radio Service Global Standard for Mobile Communications Half Rate International Mobile Equipment Identity Lithium Ion Mobile Originated Mobile Station GSM engin
13. POWER OFF At this moment AT commands can not be executed any more and only the RTC is still active Power off mode can also be indicated by STATUS pin which is at low level at this time 4 2 24 Over temperature or Under temperature Power off The module will constantly monitor the temperature of the module If the temperature gt 80 C the following URC will be reported 1 If the temperature lt 30 C the following will be reported CMTE 1 SIM800F_ Hardware Design_V1 00 24 2015 07 31 Bi Smart Machine Smart Decision If the temperature gt 85 C the following URC will be reported and the module will be automatically powered down 2 If the temperature lt 40 C the following URC will be reported and the module will be automatically powered down 2 At this moment AT commands can not be executed any more and only RTC is still active Power off mode can also be indicated by STATUS pin which is at low level at this time AT command could be used to read the temperature when the module is running For details please refer to document PS 4 2 3 Restart SIM800F by PWRKEY Pin When users need to power off the module then restart it please 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 13 lt lt 25 T4 800ms Ln E PWRKEY ST
14. VBAT voltage For detail please refer to document 4 0 Power on off 4 2 1 Power on SIM800F Users can power on SIM800F by pulling down the PWRKEY pin for more than 1 second then release This is already pulled up to 3V internally so external pull up is not necessary Reference circuit is shown as below 3V 100K PWRKEY Power K on down logic i 4 7K Ct Figure 10 Powered on down module using transistor 1 PWRKEY Power 1K on down logic Module gt lt Figure 11 Powered on down module using button The power on sequence is illustrated as following figure SIM800F_ Hardware Design V1 00 22 2015 07 31 E Qoe Smart Machine Smart Decision ok T gt 1 5s VBAT gt tls ig 2 PWRKEY J Vu lt 0 7V ec Input a VDD_EXT t3s MEDI STATUS Serial Port Undefined Active Figure 12 Timing of power on module If a fixed baud rate was set when power on procedure is completed SIM800F will send following URC to indicate that the module is ready to operate RDY This URC does not appear when auto baud detect function is active Note Users can use AT command AT IPR x to set a fixed baud rate and save the configuration to non volatile flash memory After the configur
15. and EGSM 900 conducted RF output power SIM800F_Hardware Design V1 00 54 2015 07 31 SIM800F_Hardware Design V1 00 55 2015 07 31 069 Smart Machine Smart Decision 6 10 2 Module RF Receive Sensitivity The following table shows the module s conducted receive sensitivity it is tested under static condition Table 49 SIM800F conducted RF receive sensitivity GSM850 109dBm 107dBm EGSM900 109dBm 107dBm DCS1800 109dBm 107dBm PCS1900 109dBm 107dBm 6 10 3 Module Operating Frequencies The following table shows the module s operating frequency range it is followed by the 3GPP TS 05 05 technical specification requirement Table 50 SIM800F operating frequencies GSM850 869 894MHz 824 849 MHz EGSM900 925 960MHz 880 915 2 DCS1800 1805 1880MHz 1710 1785MHz PCS1900 1930 1990MHz 1850 1910MHz SIM800F_Hardware Design_V1 00 56 2015 07 31 oe 3 7 Manufacturing Smart Machine Smart Decision 7 4 Top and Bottom View of SIM800F PIN1 P N 52 19685 21 88 SN 20615282059454 IMET dud 17 Figure 46 and bottom view of SIM800F 7 2 Typical Solder Reflow Profile Standard temperature curve and parameter rangee 45 70 Sece 7 amjvaadura T 150 210 70 120 Reflow zone Cooling zonew Preheat zonee Soak zonew Standard temperature curve and the parameter range of lead free processes Figure 47
16. battery or a capacitor e g 4 7uF VDD EXT 15 2 8V output power supply Left floating 1f unused 2 17 18 29 Cu 39 45 46 54 od roun 58 59 61 62 63 64 65 PWRKEY should be pulled low more PWRKEY 1 I than 1 second then released to power Pulled up internally already on off the module MICP 19 I Differential audio input MICN 20 Left floating if unused SPKP 21 O Differential audio output SPKN po STATUS 66 P tatus indicati ower on status indication NETLIGHT 52 Network status indication DISP_CLK 11 DISP_DATA 12 Display interface Left floating if unused DISP_D C 13 DISP_CS 14 O SDA 37 12C bus data Left floating if unused SCL 38 IO I2C bus clock KBRO 44 IO keypad row 0 Left floating if unused KBRI 43 keypad row 1 can not be pulled KBR2 42 keypad row 2 down during power on KBR3 41 keypad row 3 KBR4 40 keypad row 4 50 keypad column 1 SIM800F_Hardware Design_V1 00 16 2015 07 31 ED Out 3 Smart Machine Smart Decision KBC2 49 keypad column 2 KBC3 48 keypad column 3 KBC4 47 keypad column 4 GPIO10 51 GPIO10 Left floating if unused Do not pull up externally GPIOI1 67 GPIO11 ps Left floating if unused GPIO12 68 GPIO12 Left floating if unused UARTI RXD 10 I Receive data UARTI TXD 9 Transmit data UARTI RTS 8 I Request to send UARTI CTS 7 Clear to send Left floating if unused UARTI DCD 5 Data carrier detect UARTI RI 4 Ring indicator UARTI DTR
17. period and for the duty cycle The AT command is used to set the output period and duty cycle of the PWM For details please refer to document A typical circuit of the PWM drives buzzer is shown in the following figure VBAT 0 Module PWMC L 47K Figure 40 Reference circuit of PWM drive buzzer Table 34 PWM output characteristics Working voltage DES Working current 4 16 mA Note PWM pin must keep low when module is in the boot process Table 35 PWM multiplex function SIM800F Hardware Design V1 00 45 2015 07 31 E Qoe ee Smart Machine Smart Decision 4 18 KPLED SIM800F provides one open drain LED driver pin Table 36 Pin definition of the KPLED KPLED Sink current for keypad LED Reference circuit is recommended in the following figure VBAT Module a KPLED Figure 41 KPLED driver reference circuit Table 37 KPLED specification KPLED 4 19 Bluetooth SIM800F supports Bluetooth function which can be operated by AT commands conveniently For detail H t commands about Bluetooth please refer to documen The features of Bluetooth are listed as below Fully compliant with Bluetooth specification3 0 Support operation with GPS and GSM GPRS worldwide radio systems Fully integrated PA provides 10dbm output power Up to 4 simultaneous active ACL links Support sniff mode Suppo
18. sleep mode mA 0 N A 0 55 9 0 85 1 5 0 95 2 1 30 4 N A 0 60 4 4 Sleep Mode 1 AT CSCLK 1 Users can control SIM800F module to enter or exit the sleep mode 1 AT CSCLK 1 by DTR signal When DTR is in high level and without interrupt on air and hardware such as GPIO interrupt or data in serial port SIM800F will enter sleep mode 1 automatically In this mode SIM800F can still receive paging or SMS from network but the serial port is not accessible 4 4 5 Wake Up SIM800F from Sleep Mode 1 AT CSCLK 1 When SIM800F is in sleep mode 1 AT CSCLK 1 the following events can wake up the module DTR is pulled down Receive a voice or data call from network Receive a SMS from network 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 command 4 4 4 Sleep Mode 2 AT CSCLK 2 In this mode SIM800F 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 hardware interrupts such as GPIO interrupt SIM800F will enter sleep mode 2 automatically In this mode SIM800F can still receive paging or SMS from network Note The default setting of serial port is auto baud detection in this case the module cannot enter sleep mode 2 before the synchronization of serial port baud rate between DT
19. to set the module into minimum functionality mode And the command AT CSCLK 1 or AT CSCLK 2 can be used to set the module into sleep mode 1 or 2 In sleep mode 1 whether the module can sleep is controlled by DTR signal while in sleep mode 2 it is determined by serial port s RXD status Note The default setting is AT CSCLK 0 which do not allow the module enter sleep mode For more details please refer to document 441 Minimum Functionality Mode There are three functionality modes which could be set by the AT command AT CFUN lt fun gt The command provides the choice of the functionality levels lt fun gt 0 1 4 0 minimum functionality mode disable RF function and SIM card function 1 full functionality mode default no function is disabled 4 flight mode disable RF function If SIM800F is set to minimum functionality mode by AT CFUN 0 the RF function and SIM card function will be disabled and all AT commands correlative with RF and SIM card functions will be invalid But the serial SIMS800F Hardware Design V1 00 26 2015 07 31 E Qoe Smart Machine Smart Decision port is still accessible no matter which functionality mode it is in For detailed information about the AT Command AT CFUN lt fun gt please refer to document a Table 7 Current consumption of Minimum Functionality Mode lt fun gt BS PA MFRMS Current consumption in
20. 2015 07 31 AT CMIC is used to adjust input gain level of microphone AT CLVL is used to adjust the output gain level AT SIDET is used to set the side tone level For more details about AT command please refer to document and document Smart Machine Smart Decision In order to improve audio performance the following reference circuits are recommended The audio trace should be routed in differential and shielded by GND shown as below 4 8 1 Speaker Reference Circuit Routed in differential D amp shielded by GND E 10pF_ 33pF idOF Lc SPKP 4 4 10pF 33pF i 10 L S pF SPKN ee s 10pF__ LL 33pF badges Module T T Figure 30 Speaker reference circuit 4 8 2 Microphone Reference Circuit These components should e placed to microphone as close as possible o MICP C 10pF__ __33pF 4 MICN O Microphone 10 Figure 31 Microphone reference circuit SIM800F_ Hardware Design_V1 00 35 2015 07 31 E Qoe Smart Machine Smart Decision 4 8 3 Audio Electronic Characteristics Table 13 Microphone Input Characte
21. 3 I Data terminal ready USB interface 00 USB_VBUS 24 I USB_DP 27 IO For debugging amp upgrading firmware Left floating if unused USB_DN 28 T O Voltage supply for SIM card Support SIM_VDD 30 J 1 8V or 3V SIM card ONA 41 T Should be protected against gee a ESD with TVS diode SIM_CLK 32 SIM card clock SIM_RST 33 card reset SIM_DET 34 I SIM card detection Left floating if unused ADC 25 1 Input voltage range 2 8V Left floating if unused Recommend connecting a NRESET 16 I Reset input active 1 100nF capacitor PWMI 35 O Pulse Width Modulation 2425 Left floating if unused PWM2 36 Modulation Impendence must be GSM_ANT 60 GSM antenna 3 controlled to 500 Impendence must be BT ANT 53 IO Bluetooth antenna controlled to 500 NC 6 No connection Do not connect SIM800F Hardware Design V1 00 17 2015 07 31 E 009 Smart Machine Smart Decision 3 3 Package Dimensions 24 00 0 15 3 00 0 15 12 50 ps 24 00 0 15 SCALE 44 SCALE 41 Figure 3 Dimensions of SIM800F Unit mm SIM800F_Hardware Design_V1 00 18 2015 07 31 Recommended PCB footprint outline CUnitimm 4 00 5 26 60 25 00 24 00 SIM800F Area Keep out Area A Figure 4 Recommended PCB footprint outline Unit mm Note Keep copper out of area A Do not place via in area B to avoid
22. 481 Speaker Reference use REESE HIIS 35 482 Microphone Reference enne nnne nns 35 4 8 3 Audio Electronic Characteristics esses ener nnne nennen trennen tenere nnn eterne ens 36 494 36 4 9 SIM Card Interface satietate E 36 4 9 1 SIM Card 36 SIMS800F Hardware Design V1 00 3 2015 07 31 E Qoe 606 Smart Machine Smart Decision 4 9 2 SIM Card Circuit Design 38 493 Design Considerations for SIM Card 38 410 DISP tec 39 4411 c a 40 4 127 OB EE 41 4 12 1 ML EI LI MITIS 42 4122 UART ue e e ed ames 42 4 13 12 MUERE 42 ANA E 43 4 15 Network Status IndicattODo ieiuna Pede Eo REM 44 4 16 Power On Status 44 MEER 45 SEL MEM dub 46 4 19 nnn ecc I
23. 6 15 FIGURE 3 DIMENSIONS OF SIM800F UNIT 18 FIGURE 4 RECOMMENDED PCB FOOTPRINT OUTLINE UNIT 221202 05000400 00000000000000000034 19 FIGURE 5 REFERENCE CIRCUIT OF THE LDO POWER 0 20 FIGURE 6 REFERENCE CIRCUIT OF THE DC DC POWER SUPPLY eee eem enn emere nnne 20 FIGURE 7 REFERENCE CIRCUIT OF THE 21 FIGURE 8 VBAT VOLTAGE DROP DURING MAX POWER 21 FIGURE 9 THE LOW LIMIT OF VBAT VOLTAGE DROP DURING TRANSMITTING eee 22 FIGURE 10 POWERED ON DOWN MODULE USING TRANSISTOR 22 FIGURE 11 POWERED ON DOWN MODULE USING 22 FIGURE 12 TIMING OF POWER ON 23 FIGURE 13 TIMING OF POWER OFF SIM800F 23 FIGURE 14 TIMING OF RESTART 80 25 FIGURE 15 RESET CIRCUIT iiinn REEE 25 FIGURE T6 RESET TIMING cm 26 FIGURE 17 RTC SUPPLY FROM lt 28 FIGURE 18 RTC SUPPLY FROM NON CHARGEABLE BATTERY eene ren eene 28 FIGURE 19 RTC SUPPLY FROM RECHARGEABLE BATTERY eene eee n en en enn emen 28 FIGURE 20 CONNECTION OF THE SERIAL INTERFACES eee nennen nennen rennen
24. ATUS T222s Figure 14 Timing of restart SIM800F 4 3 Reset Function SIM800F provides a reset pin pin 16 to reset the module This function is used as an emergency reset only when AT command AT CPOWD 1I and the PWRKEY pin do not work Pull the RESET pin to ground then the module will reset This pin is already isolated from the chipset inside the module so the external isolation is not necessary Following figure shows the internal circuit 1 8V 28V 4 7K l RESET RESET Q O Circuit L Module Figure 15 Reset Circuit SIM800F_Hardware Design_V1 00 25 2015 07 31 E Qoe 606 Smart Machine Smart Decision RESET pin is pulled up to 2 8V internally so the users could set the GPIO as an open drain output pin when use MCU s GPIO to control it Table 6 Electronic characteristic of the RESET Pin Pin name Symbol Min Typ Max Unit Vin 27 2 9 V RESET 0 6 105 mS The reset sequence is illustrated as below RESET T gt 105ms lt 15 VDD_EXT 2 8V VDD_EXT STATUS 4 lt m Figure 16 Reset timing 4 4 Power Saving Mode SIM800F has two power saving modes minimum functionality mode and sleep mode The power consumption can be reduced to the minimum when SIM800F is in both sleep mode and minimum functionality mode The AT command AT CFUN lt fun gt can be used
25. CE and customer side DTE Module DCE Customer DTE Serial Port Serial Port UART1_TXD TXD UART1_RXD RXD UART1 RTSO ORTS UART1 CTS gt O UART1 DTR UART1 DCDO gt O DCD UART1 RI gt O RING GND O Figure 20 Connection of serial interfaces If the voltage level of UART is 3 3V at customer side the following reference circuits are recommended for lower cost If the voltage is 3 0V please change the resistors in the following figure from 5 6K to 14K SIM800F_ Hardware Design_V1 00 30 2015 07 31 3 ene Smart Machine Smart Decision UART1 TXDO 1K gt RXD UART1 RXDO e TxD UART1 RTSO 1K RTS UART1_CTSC 1K O CTS UART1 DTRO e 1K Gi UART1 DCDO 1K gt GPIO UART1 RIO 1K gt EINT GND QA 5 6K 5 6K GND o e DTE Module L 3 3 Figure 21 Level converting by resistor If the voltage of UART is 3V or3 3V users also can use following reference circuits VDD EXT C Pi TXD TXD gt GND O GND Module gx DTE Figure 22 Level converting by diodes Note when diode is used for level converting customer should check the voltage drop on t
26. E and DCE 4 4 5 Wake Up SIM800F from Sleep Mode 2 AT CSCLK 2 When SIM800F is in sleep mode 2 AT CSCLK 2 the following events can wake up the module Receive data via main serial port the first several character will lose Receive a voice or data call from network Receive a SMS from network SIMS800F Hardware Design V1 00 27 2015 07 31 d 4 5 RTC Backup Smart Machine Smart Decision is the power supply for RTC circuit and its typical value is 2 8V To allow the RTC to operate even when VBAT is turned off it is recommended to connect the VRTC pin to a backup battery or an external large capacitance capacitor 100uF is recommended When VBAT is turned on RTC circuit is supplied from an internal LDO and the backup battery or the external capacitor will be charged through VRTC pin When VBAT is turned off RTC circuit will be supplied from the backup battery or the external capacitor The following figures show various references for RTC backup circuit External capacitor backup Module VRTC 1 5K RTC Large capacita nce Capacitor Figure 17 RTC supply from capacitor Non chargeable battery backup Module VRTC gt 1 5 Non Backup Battery Figure 18 RTC supply from non chargeable battery r lt Rechargeable battery backu
27. RE 37 REFERENCE CIRCUIT OF THE KEYPAD INTERFACE 41 FIGURE 38 RF SYNC SIGNAL DURING TRANSMIT BURST seen een emen 42 FIGURE 39 REFERENCE CIRCUIT OF NETLIGHT rennen RE ES 44 FIGURE 40 REFERENCE CIRCUIT OF PWM DRIVE 45 FIGURE 41 KPLED DRIVER REFERENCE 46 FIGURE 42 GSM ANTENNA MATCHING CIRCUIT 47 FIGURE 43 GSM ANTENNA MATCHING CIRCUIT WITHOUT RF CONNECTOR eee 47 FIGURE 44 BLUETOOTH ANTENNA MATCHING CIRCUIT esee nnne 48 FIGURE 45 PIN ASSIGNMEN itr tette e e eb Er ae e HERES 49 SIMS800F Hardware Design V1 00 8 2015 07 31 FIGURE 46 TOP AND BOTTOM VIEW SIM800F FIGURE 47 TYPICAL SOLDER REFLOW PROFILE SIM800F_ Hardware Design V1 00 Smart Machine Smart Decision 9 2015 07 31 E Qoe 6 Smart Machine Smart Decision Version History 2015 07 31 1 00 Initial release Yan Zhang Hailin Yang SIM800F_Hardware Design_V1 00 10 2015 07 31 E Qoe Smart Machine Smart Decision 1 Introduction This document describes SIM800F hardware interface in great detail This document can help users understand both the interface specifications and the electrical and mechanical details of SIM800F quickly With the help of this document and other SIM800F application notes or us
28. SHT 1 3 PUSH ROD LEVER MUST NOT PROTRUDE BEYOND HOUSING EDGE IN THIS AREA 4 TAILS ON EACH SIDE OF CONNECTOR TO LIE WITHIN O l2mm OF EACH OTHER MATERIAL HOUSING LIQUID CRYSTAL POLYMER LCP 30 GLASS FILL ULS4 0 COLOUR BLACK TERMINAL 0 15 PHOSPHOR BRONZE O lum MIN Au OVER CONTACT AREA 2 5um MIN Sn ON SMT TAILS NV PUSH BUTTON GF NYLON 46 YELLOW HR 0 25 STAINLESS STEEL WV PUSH ROD 0 4 STAINLESS STEEL V C PIN LEVER 0 4 STAINLESS STEEL REVISE ONLY ON SYSTEM een ara ene bene Im m SIM PCB CONNECTOR 19 EUROPE rap war er EM ma 91228 Figure 34 Molex 91228 SIM card holder Table 16 Pin description Molex SIM card holder Cl SIM_VDD SIM card power supply SIM800F_Hardware Design_V1 00 38 2015 07 31 Smart Machine Smart Decision For 6 pin SIM card holder SIMCom recommends to use Amphenol C707 10M006 5122 Users can visit http www amphenol com for more information about the holder Figure 35 Amphenol C707 10M006 5122 SIM card holder Table 17 Pin description Amphenol SIM card holder 4 10 DISP Interface SIM800F provides a serial display interface 51 800 Hardware Design V1 00 39 2015 07 31 E ee Smart Machine Smart Decision Table 18 Pin definition of DISP interface
29. Standby High Changed to low But when any of the following events occur it will be changed to high 1 Establish the call 2 Hang up the call Receive Voice call Receive Changed to low and kept low for 120ms then changed to high SMS When URC are reported this pin will be changed to low and kept low for 1205 then changed to high For more details please refer to document The behavior of the RI pin is shown in the following figure when the module is used as a receiver SIMS800F Hardware Design V1 00 33 2015 07 31 3 ene Smart Machine Smart Decision RI HIGH Establish the call Hang up the call LOW cece eee TA Idle Ring Figure 27 RI behaviour of voice calling as a receiver HIGH B 120 5 LOW 5 5 URC Figure 28 RI behaviour of URC or receive SMS However if the module is used as caller the RI will remain high Please refer to the following figure HIGH BI Idle Ring Establish Hang up Idle the call the call Figure 29 RI behaviour as a caller 4 8 Audio Interfaces SIM800F provides one analog input for electronic microphone and one analog output to drive 320 receiver Table 12 Audio interface definition Pin name Pin number Function MICP 19 Audio input positive Audio MICN 20 Audio input negative channel SPKP 21 Audio output positive SPKN 22 Audio output negative SIM800F_ Hardware Design V1 00 34
30. Typical Solder Reflow Profile Note Please refer to Module secondary SMT UGD for more information about the module shipping and manufacturing SIM800F Hardware Design V1 00 57 2015 07 31 2 E Qoe Smart Machine Smart Decision The moisture sensitivity level of SIM800 is 3 The module should be mounted within 168 hours after unpacking in the environmental conditions of temperature lt 30 C and relative humidity of lt 60 RH It is necessary to bake the module if the above conditions are not met Table 51 Moisture classification level and floor life 1 Unlimited at lt 30 C 85 RH 2 1 2 4 weeks 168 hours 4 72 hours 5 48 hours 24 hours 6 Mandatory bake before use After bake it must be reflowed within the time limit specified on the label Note 1 If the vacuum package is not open for 6 months or longer than the packing date baking is also recommended before re flow soldering 2 For product handling storage processing IPC J STD 033 must be followed 7 2 Baking Requirements Because of its sensitivity to moisture absorption SIM800 should be baked sufficiently before re flow soldering Otherwise SIM800 will be at the risk of permanent damage during re flow soldering SIM800 should be baked 192 hours at temperature 40 C 5 C 0 C and lt 5 RH for low temperature device containers or 72 hours at temperature 80 C 5 C for high temperature device contain
31. 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 not be executed any more and only the RTC is still active Power off mode can also be indicated by STATUS pin which is at low level at this time 4 2 2 2 Power off SIM800F by AT Command SIM800F be powered down by AT command AT CPOWD 1 This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut down Before completing the power off procedure the module will send URC NORMAL POWER OFF At this moment AT commands can not be executed any more and only the RTC is still active Power off mode can also be indicated by STATUS pin which is at low level at this time For details about the AT command AT CPOWD please refer to document m 4 2 2 3 Over voltage or Under voltage Power off The module software monitors the VBAT voltage constantly If the voltage x 3 5V the following URC will be reported UNDER VOLTAGE WARNNING If the voltage gt 4 3V the following will be reported OVER VOLTAGE WARNNING If the voltage 3 4V the following URC will be reported and the module will be automatically powered off UNDER VOLTAGE POWER OFF If the voltage gt 4 4V the following will be reported and the module will be automatically powered off OVER VOLTAGE
32. aptive multi rate AMR Echo Cancellation Noise Suppression Serial port Full modem serial port Can be used for AT commands or data stream Support RTS CTS hardware handshake Comply with GSM 07 10 Multiplexer Protocol Support auto baud detect from 1200 bps to 115200bps USB For debugging and upgrading firmware Support phonebook types SM FD LD RC ON MC GSM 11 14 Release 99 Support RTC Size 24 24 3mm Weight 3 1g Upgrade firmware via USB port 2015 07 31 Smart Machine Smart Decision Table 2 Coding schemes and maximum net data rates over air interface Coding scheme CS 1 CS 2 CS 3 CS 4 1 timeslot 2 timeslot 4 timeslot 9 05kbps 18 1kbps 36 2kbps 13 4kbps 26 8kbps 53 6kbps 15 6kbps 31 2kbps 62 4kbps 21 4kbps 42 8kbps 85 6kbps 2 2 Operating Modes The table below summarizes the various operating modes of SIM800F Table 3 Overview of operating modes Mode Normal operation Power off Minimum functionality mode Function Module will automatically go into sleep mode when the sleep mode is enabled and there is no on air or hardware interrupt such as GPIO interrupt GSM GPRS or data on serial port SLEEP In this case the current consumption of module will reduce to minimal level and the module can still receive paging message and SMS GSM Software is active Module has been registered to the GSM network and is IDLE ready to communicate GSM Connection between two s
33. art Machine Smart Decision TABLE 46 THE ESD CHARACTERISTICS TEMPERATURE 25 C HUMIDITY 45 96 54 TABLE 47 SIM800F GSM 850 AND EGSM 900 CONDUCTED RF OUTPUT 54 TABLE 48 SIM800F DCS 1800 AND PCS 1900 CONDUCTED RF OUTPUT 55 TABLE 49 SIM800F CONDUCTED RECEIVE SENSITIVITY 56 TABLE 50 SIM800F OPERATING 5 56 TABLE 51 MOISTURE CLASSIFICATION LEVEL AND FLOOR 2 4 58 TABLE 52 BAKING REQUIREMENTS EEE ETETE NE EEEN SESE SEEE Ei 58 TABLE 53 RELATED DOCUMENTS ceci ctione ne t eta eene eene en eee eaa 59 34 MULTIPLEX FUNGLEIGON etes r EE NAAA TOKE PEPESE RES ER ER ELE OT EE RR 60 TABLE 55 TERMS AND ABBREVIATIONS 5S sentence rettet e attese teen big oe eto ela re getto 61 TABLE 56 SAFETY CAUTION peteret rna Peur eae bets eee sb Egan dnb Prae ke eR SE Ere aM eed ch aane Rua nra re Fu 63 SIMS800F Hardware Design V1 00 7 2015 07 31 Smart Machine Smart Decision Figure Index FIGURE 1 SIM800F FUNCTIONAL 7 7 14 FIGURE 2 SIM800F PIN OUT DIAGRAM 2
34. as well This section will give some guidelines on PCB layout to eliminate interfere or noise by greatest degree and save product development period 5 1 PIN Assignment Before the placement of the PCB design customer should learn well about PIN assignment in order to get reasonable layout with so many external components Please refer to the figure below GSM ANT BT ANT Power Supply 66 STATUS 52 NETLIGHT 68 1012 67 GPIOll Keyboard SIMS 00F Top View Audio Interface USB Figure 45 Pin assignment SIMS800F Hardware Design V1 00 49 2015 07 31 Bi Smart Machine Smart Decision 5 2 Principle of PCB Layout During layout we should pay attention to the following interfaces such as Antenna power supply SIM card interface audio interface and so on 5 21 Antenna Thelength 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 Not only VBAT but also 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 10 GND pads in the module these pads could enhance the GND performances On the upper layer of t
35. ated as below SIM Card SIM VDD e vce GND SIM_RST RST VPP Module ET VO Drm C707 10M 006 512 SIMDATA X Ti 22pF 100nF SMF15C Figure 33 Reference circuit of the 6 pin SIM card holder Note 510 series resistors are not needed for SIM_RST SIM_CLK SIM_DATA which are build in already SIM800F_ Hardware Design_V1 00 37 2015 07 31 4 9 2 SIM Card Circuit Design Guide Smart Machine Smart Decision SIM card signal could be interfered by the high speed signal it is 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 Parasitic capacitance of TVS on SIM_CLK SIM_DATA should less than 50pF 4 93 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 RECOMMENDED PCS LAYOUT 2 1 NOTES 1 SEE PRODUCT SPECIFICATION 5 99020 0071 2 PACKING TAPE AND REEL FOR DETAIL SEE 50 91228 9001
36. ation is saved as fixed baud rate the Code RDY could be received from the serial port every time when SIM800F is powered on For details please refer to the chapter AT IPR in document 5 4 2 2 Power off SIM800F SIM800F will be powered off in the following situations Normal power off procedure power off SIM800F by the PWRKEY pin Normal power off procedure power off SIM800F 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 21 Power off SIM800F by the PWRKEY Pin Users can power off SIM800F by pulling down the PWRKEY pin for more than second then release The power off sequence is illustrated as below PWRKEY IseT 39s 5 INPUT 1 lt 0 7 E VDD EXT Hi gt 25 STATUS EOM T3 2s Serial Port Active Underfined Figure 13 Timing of power off SIM800F by PWRKEY SIMS800F Hardware Design V1 00 23 2015 07 31 m E 00 Smart Machine Smart Decision 1 Ifthe PWRKEY pull down time exceeds 33s SIM800F module will power up again 2 VDD_EXT will be turned off after PWRKEY was released for at least 55ms and STATUS was changed to low If Is lt T1 lt 2s then T222s If 2s lt T1 lt 33s then T2 gt T1 55ms This procedure makes the module log off from the network and allows the software to enter into
37. e also referred to as TE Mobile Terminated Password Authentication Protocol Packet Broadcast Control Channel Printed Circuit Board Power Control Level Personal Communication System also referred to as GSM 1900 Protocol Data Unit Point to point protocol Radio Frequency Root Mean Square value Real Time Clock Receive Direction Subscriber Identification Module Short Message Service Time Division Distortion SIM800F_ Hardware Design V1 00 61 2015 07 31 Smart Machine Smart Decision SIM800F_Hardware Design V1 00 62 2015 07 31 Smart Machine Smart Decision IV Safety Caution Table 56 Safety caution SIM800F_Hardware Design_V1 00 63 2015 07 31 hi Smart Machine Smart Decision Contact us Shanghai SIMCom Wireless Solutions Ltd Add SIM Technology Building No 633 Jinzhong Road Changning District Shanghai China 200335 Tel 86 21 3235 3300 Fax 86 21 3235 3301 URL www sim com wm SIMS800F Hardware Design V1 00 64 2015 07 31
38. eeeseeeseee eese e eee eene nnne nnne nnne 52 6 6 VDD EXT Characteristics E 52 6 7 VW RIC Characteristics cs 52 6 8 Current Consumption 4 02 400 000 00 00000000000 innere nns 53 6 9 Electro Static Discharge ccccccccccssscsssecseeeeeneeeeseecsscecseneeeeseeesseecssaecseceessseesaseeesseeeseneeseeesesseeeneeeseaeenes 54 6 10 Radio Characteristic S ite eve Bowl aede rau edere 54 6 10 1 Module RF Output POWEE pee aree Hp eG 54 6 10 2 Module RF Receive 56 6 10 3 Module Operating 1 56 7 Manufacturing 57 7 1 and Bottom View 5 80 0 57 7 2 Typical Solder Retlow Protile roo ee age 57 7 1 The Moisture Sensitivity Level 58 7 2 Baking Requireraents 58 8 Q 59 I Related P 59 II Multiplex E nctiot e eR NIE Hi GNI 60 SIMS800F Hardware Design V1 00 4 2015 07 31 III
39. er guide users can use SIM800F to design various applications quickly 2 SIM800F Overview Designed for global market SIM800F is a quad band GSM GPRS module that works on frequencies GSM 850MHz EGSM 900MHz DCS 1800MHz and PCS 1900MHz SIMSOOF features GPRS multi slot class 10 class 8 optional and supports the GPRS coding schemes CS 1 CS 2 CS 3 and CS 4 With a tiny configuration of 24 24 3mm SIM800F can meet almost all the space requirements in users applications such as smart phone PDA and other mobile devices SIM800F is a SMT package with 68 pads and provides hardware interfaces as below One full function UART port One USB port for debugging and firmware upgrading Audio channel which includes a microphone input and a receiver output One SIM card interface Support up to 4 5 Keypads One display interface One master interface for peripheral management Programmable general purpose input and output Two PWM output One ADC input Bluetooth antenna interface GSM antenna interface SIM800F is designed with power saving technique so that the current consumption is as low as 0 55mA in sleep mode SIMSOOF 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 a 21 SIMS800F Key Features Table 1 SIM800F key features Feature Implementation Power supply 3 4V 4 4V SIM800F_Hardware D
40. ers Note that the plastic tray is not heat resistant so SIM800 modules should be taken out for baking otherwise the tray may be damaged by high temperature during baking Table 52 Baking requirements 409 559 lt 5 192 hours 120P CESC lt 5 4 hours SIM800F_Hardware Design_V1 00 58 2015 07 31 069 8 I Related Documents Table 53 Related Documents SN Document name 5 800 Series AT Command Manual V1 00 doc ITU T Draft new recommendation V 25ter 1 2 3 GSM 07 07 4 GSM 07 10 5 GSM 07 05 6 GSM 11 14 7 GSM 11 11 8 GSM 03 38 9 GSM 11 10 10 AN Serial Port 11 SIM900 12 Module secondary SMT UGD AN SMT 13 Module RF Reference Design Guide 51 800 EVB kit User 14 Guide VX XX SIMS800F Hardware Design V1 00 Smart Machine Smart Decision Remark Serial asynchronous automatic dialing and control Digital cellular telecommunications Phase 2 AT command set for GSM Mobile Equipment ME Support GSM 07 10 multiplexing protocol Digital cellular telecommunications Phase 2 Use of Data Terminal Equipment Data Circuit terminating Equipment DTE DCE interface for Short Message Service SMS and Cell Broadcast Service CBS Digital cellular telecommunications system Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity Module Mobile
41. esign_V1 00 11 2015 07 31 Power saving Frequency bands Transmitting power GPRS connectivity Temperature range Data GPRS USSD SMS FAX SIM interface External antenna Audio features Serial port and USB Phonebook management SIM application toolkit Real time clock Physical characteristics Firmware upgrading SIM800F_ Hardware Design_V1 00 12 Smart Machine Smart Decision Typical power consumption in sleep mode is 0 55mA AT CFUN 0 SIM800F Quad band GSM 850 EGSM 900 DCS 1800 PCS 1900 SIM800F can search the 4 frequency bands automatically The frequency bands also can be set by AT command For details please refer to document Compliant to GSM Phase 2 2 Class 4 2W at GSM 850 and EGSM 900 Class 1 IW at DCS 1800 and PCS 1900 GPRS multi slot class 10 default GPRS multi slot class 8 option Operation temperature 409 85 C Storage temperature 45 C 90 C GPRS data downlink transfer max 85 6 kbps GPRS data uplink transfer max 42 8 kbps Coding scheme CS 1 CS 2 5 3 and CS 4 Integrate the TCP IP protocol Support Packet Broadcast Control Channel PBCCH Unstructured Supplementary Services Data USSD support MT MO CB Text and PDU mode SMS storage SIM card Group 3 Class 1 Support SIM card 1 8V 3V Antenna pad Speech codec modes Half Rate ETS 06 20 Full Rate ETS 06 10 Enhanced Full Rate ETS 06 50 06 60 06 80 Ad
42. he diode to make sure the signal s voltage level could meet both module and DTE s electrical character The recommend diode is Schottky diode e g RBS551V 30TE 17 SDM20U40 If the voltage of UART is 5V on customer side users can use the following reference circuits VDD EXT Module m DTE 4 7K VBD VDD EXT Q 4 7K 47K TXD C e RXD Figure 23 TX level converting by transistor SIMS800F Hardware Design V1 00 31 2015 07 31 E Qoe Smart Machine Smart Decision VDD_EXT Module VDD VDD 4 7K 4 7K 47K RXD e x TXD Figure 24 RX level converting by transistor 4 63 USB Interface USB interface supports software debug function When power on the module connect VBUS USB_DP USB_DN and GND to PC install the driver successfully a com port could be recognized by PC then customer could debug via this com port The reference circuit is shown as below USB_VBUS e VBUS 22R USB DN O 1 O USB DN 22R USB DP e USB DP tuF GND GND Moudle USB Figure 25 USB reference circuit The maximum capacitance of TVS on USB data line should be less than 5pF e g ESD9L5 0ST5G and ESD9MS5 0ST5G The USB DP and USB DN should be routed
43. hese 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 20 4 Audio Interface The signal trace of audio should far away from antenna and power Theaudio signal should avoid to parallel with VBAT trace 5 2 5 Others Itis better to trace signal lines of UART bunched as well as signals of USB SIMS800F Hardware Design V1 00 50 2015 07 31 E Qoe Smart Machine Smart Decision 6 Electrical Reliability and Radio Characteristics 6 1 Absolute Maximum Ratings The absolute maximum ratings stated in following table are stress ratings under non operating conditions Stresses beyond any of these limits will cause permanent damage to SIM800F Table 38 Absolute maximum ratings VBAT VBAT power supply voltage 0 3 VBUS USB power supply voltage 0 3 7 0 Ii Digital interface input current 4 16 mA Io Digital interface output current 4 16 mA 6 2 Recommended Operating Conditions Table 39 Recommended operating conditions VBAT Power supply vo
44. in differential traces Note please reserve USB interface or test point for debugging Table 10 VBUS characteristics Pin Min Typ Max Unit VBUS 4 3 5 0 7 0 V 4 6 4 Software Upgrading and Debugging Customer could upgrade module s firmware through USB or UART interface SIMS800F Hardware Design V1 00 32 2015 07 31 m E Qoe Smart Machine Smart Decision If upgrading through USB interface it is necessary to power on SIM800F first and then connect USB_VBUS USB_DP USB_DN and GND to PC There is no need to operate PWRKEY pin in the whole procedure when SIM800F detects USB_VBUS and could communicate with USB DP and USB DN it will enter USB download mode automatically If users upgrade the software through UART interface it is recommended to lead UARTI TXD UARTI RXD GND and PWRKEY pin to IO connector for the upgrading and PWRKEY pin should connect to GND while upgrading The reference connection is shown as below Module DCE Connector Ne TXD UART1 RXDC RXD GND QO GND PWRKEY O O gt t7 o4 PWRKEY Figure 26 Connection for software upgrading and debugging through UART UART interface does not support RS 232 level When connect the module to the computer the level shifter 1s needed For more details about software upgrading please refer to document 4 7 RI Behaviors Table 11 RI Behaviors State RI response
45. ltage 3 4 4 0 4 4 Operating temperature 40 25 85 6 TsrG Storage temperature 45 90 6 3 Digital Interface Characteristics Table 40 Digital interface characteristics High level input voltage 2 4 Vit Low level input voltage 0 4 High level output voltage p V Vor Low level output voltage 0 1 V Note These parameters are for digital interface pins such as keypad GPIO I2C UART LCD and PWM 6 4 SIM Card Interface Characteristics Table 41 SIM card interface characteristics High level input current Low level input current 10 10 uA Vin High level input voltage 1 4 V SIM800F Hardware Design V1 00 51 2015 07 31 6 5 SIM VDD Characteristics Table 42 SIM_VDD characteristics 6 6 VDD EXT Characteristics Table 43 VDD_EXT characteristics 6 7 VRTC Characteristics Table 44 VRTC characteristics 51 800 Hardware Design V1 00 52 2015 07 31 Smart Machine Smart Decision 6 8 Current Consumption VBAT 4V Table 45 Current consumption Note The data above are the typical value tested in laboratory In the mass production stage there are differences among each individual SIM800F_Hardware Design V1 00 2015 07 31 6 10 Radio Characteristics 6 10 1 Module RF Output Power The following table shows the module conducted output power it is followed by the 3GPP TS 05 05 technical specification requirement Table 47 SIM800F GSM 850
46. mended zener diode Vendor Part number Power watts Packages 1 On semi MMSZ5231BT1G 500mW SOD123 2 PZ3D4V2H 500mW SOD323 3 Vishay MMSZ4689 V 500mW SOD123 4 Crownpo 755 5 15 500mW 0805 In addition VBAT voltage will drop during the transmitting The following figure shows the VBAT voltage drop during maximum power transmitting under the condition VBAT 4 0V C4 1004F tantalum capacitor ESR 0 7Q 1 ceramic capacitor 57746 4615ms lvBAT Burst 2A VBAT Max 350mV Figure 8 VBAT voltage drop during max power transmitting However hardware may shutdown once the voltage drops below 3 0V which must be avoid SIM800F_ Hardware Design V1 00 21 2015 07 31 E Qoe Smart Machine Smart Decision VBAT Min 3 0V Figure 9 The low limit of VBAT voltage drop during transmitting To decrease voltage drop the PCB traces from power supply to VBAT pins must be wide and short enough The power IC and the bypass capacitor should be placed as close to the module as possible 4 1 1 Power Supply Pins Pin 55 56 57 are VBAT input pins and pin 62 63 64 65 are the main GND for VBAT The other GND pins should be connected as well 4 1 2 Monitoring Power Supply AT command can be used to monitor the
47. omplies with the GSM Phase 1 specification and the new GSM Phase 2 specification for FAST 64 kbps SIM card Both 1 8V and 3 0V SIM card are supported SIM800F Hardware Design V1 00 36 2015 07 31 Smart Machine Smart Decision Table 15 SIM pin definition Pin name SIM_VDD SIM_DATA SIM_CLK SIM RST SIM DET Pin number 18 15 16 17 14 Function Voltage supply for SIM card Support 1 8V or 3V SIM card SIM data input output SIM clock SIM reset SIM card detection The SIM DET pin is used for SIM card detection Users can select the 8 pin SIM card holder to implement this 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 2 It is recommended to place ESD protection component close to the SIM card holder such as SMF15C provided by ON SEMI www onsemi com The reference circuit of the 8 pin SIM card holder is illustrated as below VDD EXT A 7K MOLEX 91228 SIM VDD e lvcc GND EE tT sn Module SINDET e CLK e PRESENCE GND c SIM DATA i SIM Card 22pF __ 100nF 5 15 Figure 32 Reference circuit of 8 pin SIM card holder If the SIM card detection function is not used users can keep SIM_DET pin open The reference circuit of 6 pin SIM card holder is illustr
48. p Module VRTC 1 5K RTC Maca ne Haat Rechargeable tA Figure 19 RTC supply from rechargeable battery Note 1 For electrical characteristics please refer to Table 44 VRTC characteristics 2 Theclock error becomes larger when VBAT is turned off and RTC circuit was supplied from the backup battery or the external capacitor SIMS800F Hardware Design V1 00 28 2015 07 31 3l Smart Machine Smart Decision 4 6 Serial Port and USB Interface Table 8 Serial port and USB pin definition Hardware flow control is disabled by default AT command 2 2 can enable hardware flow control The command AT IFC 0 0 can disable hardware flow control For more details please refer to document 2 Pin 68 51 are configured as GPIO by default AT command AT CMNRP I can set them to be serial port UART2 Table 9 Serial port characteristics 4 6 1 Function of Serial Port Serial port UARTI Support modem device Contain data lines UARTI TXD UARTI RXD hardware flow control lines RTS UARTI CTS and status lines UARTI DCD UARTI RI Serial port can be used for GPRS service and AT communication Serial port supports the following baud rates 1200 2400 4800 9600 19200 38400 57600 and 115200bps
49. rate 1 0833 MHz ADC precision 10 30 mV SIM800F Hardware Design V1 00 43 2015 07 31 E Qoe Qos Smart Machine Smart Decision 4 15 Network Status Indication Table 28 Pin definition of the STATUS NETLIGHT Network status indication The NETLIGHT pin can drive one LED to indicate network status which are listed in the following table Table 29 Status of the NETLIGHT pin Powered off 64ms On 800ms Off Not registered to the network 64ms On 3000ms Off Registered to the network 64ms On 300ms Off GPRS communication is established A reference circuit is recommended in the following figure Module NETLIGHT O Ps 47K Figure 39 Reference circuit of NETLIGHT Table 30 NETLIGHT multiplex function NETLIGHT 52 NETLIGHT GPIO 4 16 Power On Status Indication The STATUS pin indicates the power on status of module The pin outputs high when module is powered on outputs low when module is powered off Table 31 Pin definition of the STATUS STATUS Power on status indication SIM800F_Hardware Design_V1 00 44 2015 07 31 E Qoe Smart Machine Smart Decision Table 32 STATUS multiplex function STATUS STATUS GPIO 4 17 PWM Table 33 Pin definition of the PWM PWMI PWM2 36 PWM2 PWM output frequency varies from 0 to 2KHz Two 7 bit unsigned binary parameters are used for the output
50. ristics Mic biasing voltage Working Current 2 0 mA Input impedance differential 13 20 27 KQ Idle channel noise 67 dBm0 Input level 40dBm0 29 dB SINAD Input level 0dBm0 69 dB Table 14 Audio Output Characteristics Normal output _ R532 Q receiver 4 84 TDD Audio signal could be interfered 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 connector Conducting noise is mainly caused by the VBAT drop If the 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 9 SIM Card Interface 4 9 1 SIM Card Application The SIM interface c
51. rtet tentent nn 44 TABLE 31 PIN DEFINITION THE STATUS tette ttt inn 44 TABLE 32 STATUS MULTIPLEX FUNCTION eterne ttt 45 TABLE 33 PIN DEFINITION OF THE PWM eet 45 TABLE 34 PWM OUTPUT CHARACTERISTICS eerte tentent 45 TABLE 35 PWM MULTIPLEX 2 2 2 2 0 20220100100201 2001000000100000010 45 TABLE 36 PIN DEFINITION OF THE KPLED eerte ttt treten tentent 46 TABLE 37 KPLED SPECIFICATION eerte 46 TABLE 38 ABSOLUTE MAXIMUM 51 TABLE 39 RECOMMENDED OPERATING CONDITIONS eterni 51 TABLE 40 DIGITAL INTERFACE CHARACTERISTICS eerte treten treten tentis 51 TABLE 41 SIM CARD INTERFACE CHARACTERISTICS ccssssssssessssesssseesssessssessssesssecessessssesssesssnecssecssseseaseessecesss 51 TABLE 42 SIM VDD CHARACTERISTICS 52 TABLE 43 VDD EXT 5 58 24 2 22000122100000000000000 52 TABLE 44 VRTC CHARACTERISTICS eerte tette tentent tette tt tette 52 TABLE 45 CURRENT CONSUMPTION 2 4 1522002200000000000 ttt ttt ttt ttt tte tette testet sid 53 SIMS800F Hardware Design V1 00 6 2015 07 31 E Qoe Sm
52. rts PCM interface and built in programmable transcoders for liner voice with transmission 4 20 Antenna Interface There are two antenna interfaces ANT and BT ANT Theinput impendence of the antenna should be 500 and the VSWR should be less than 2 It is recommended that GSM antenna and the BT antenna should be placed as far as possible The isolations of the two antenna should be bigger than 30dB Note About the RF trace layout please refer to AN SMT Module Reference Design Guide SIM800F Hardware Design V1 00 46 2015 07 31 Smart Machine Smart Decision 4 20 1 GSM Antenna Interface SIM800F provides a GSM antenna named GSM ANT customer could use 500 microstrip line or stripline antenna connect to the module It is recommended to reserve the matching circuit as following GND Pin59 Module RF connector GSM R101 Antenna GSM_ANT O C101 C102 GND 7 Pin61 Figure 42 GSM antenna matching circuit R101 C101 C102 are the matching circuit the value should be defined by the antenna design Normally R101 is 0Q C101 and C102 are not mounted 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 GND Pin59 Module GSM ANT R101 Antenna C101 C102 GND lt 61
53. short circuit between the vias on customer board and the test points on the bottom side of the module SIM800F_Hardware Design_V1 00 19 2015 07 31 4 Application Interface Smart Machine Smart Decision 41 Power Supply The power supply of SIM800F ranges from 3 4V to 4 4V and 4 0V is recommended It must be able to provide sufficient current up to 2A for the high power transmitting If the DC input voltage is 5 and customers do not care about the power efficiency a high current low dropout regulator is recommended The following figure is the reference design DC INPUT 0101 MIC29302 e 2 Vin Vout 5 e e e 101 C102 1 5 a Er TOR 33ouF 100 R102 43 Figure 5 Reference circuit of the LDO power supply Note To ensure a proper behavior of the regulator under light load an extra minimum load R103 in Figure 5 is required because the current SIM800F consumed is very small in sleep mode and power off mode For more details about minimum load please refer to specification of MIC29302 To increase power efficiency the switching mode DC DC converter is preferable especially when DC input voltage is quite high The following figure is the reference design and it is recommended to reserve a proper ferrite bead FB101 in Figure 6 in series for EMI suppre
54. ssion DC INPUT 0101 LM2596 ADJ L101 101 BAT p 1 yi 2 YN Vout 9 9 a as 3 E 100uH 270R 100MHz pide 9 10 1uF a3QuF T T4 2 2K PWR_CTRL 3 100nF d MBR360 E R102 mE 1K Figure 6 Reference circuit of the DC DC power supply For battery powered application the 3 7V lithium battery can be connected to SIM800F VBAT pins directly but other types of battery must be used carefully since their maximum voltage may rise over the absolute maximum voltage of the module When battery is used the total impedance between battery and VBAT pins should be less than 150mQ In any case mentioned above at the VBAT input pin side please take below circuit as a reference SIMS800F Hardware Design V1 00 20 2015 07 31 E Qoe Smart Machine Smart Decision VBAT 10PF ua 5 1V T 500m Figure 7 Reference circuit of the VBAT input Where is 100uF tantalum capacitor with low ESR could be a 1 10uF ceramic capacitor 33PF and 10 capacitors are used for eliminating the high frequency interference 5 1V 500mW zener diode can protect the module against voltage surge All of these components should be placed as close to VBAT pins as possible Table 5 Recom
55. ubscribers is in progress In this case the power TAL consumption depends network settings such as DTX off on FR EFR HR hopping sequences antenna URS 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 STANDBY GPRS configuration There is GPRS data transfer PPP or TCP or UDP in progress In this case GPRS power consumption is related with network settings e g power control DATA level uplink downlink data rates and GPRS configuration e g used multi slot settings Normal power off by sending the AT command AT CPOWD 1 or using PWRKEY The power management unit shuts down the power supply for the baseband part of the module and only the power supply for the RTC is remained Software is not active The serial port is not accessible Power supply connected to VBAT remains applied AT command AT CFUN can be used to set the module to a minimum functionality mode In this mode the RF function and SIM card function can be disabled but the serial port is still accessible The power consumption in this mode is lower than normal mode SIMS800F Hardware Design V1 00 13 2015 07 31 2 3 SIMS00F Functional Diagram Smart Machine Smart Decision GSM Power Radio Suppl
56. ware If you need please contact SIMCom 4 42 GPIO SIM800F provides 3 GPIO which could be used as RF SYNC JD and UART2 For GPIO function both output and input voltage level of the GPIO can be set by AT command SGPIO or AT CGPIO For more details please refer to document Table 21 Pin definition of the GPIO Pin Name GPIO10 GPIO11 GPIO12 Pin Number 51 67 68 SIM800F_ Hardware Design_V1 00 Default Function GPIO GPIO GPIO 41 Default State Output Pull down Output Pull down Output Pull down 2015 07 31 E Qoe Smart Machine Smart Decision 4 121 RF SYNC JD RF synchronization signal could indicate the incoming GSM burst The timing is shown as below 2208 577 4 Burst RF_SYNC Figure 38 RF_SYNC signal during transmit burst GPIO11 can also be used to indicate the RF jamming The RF SYNC function and RF Jamming Detection function can be switched by AT SJDR command For more details please refer to document Table 22 GPIO11 Multiplexing function GPIO11 67 GPIO RF_SYNC JD RF jamming detection Note 1 Do not pull up GPIOII 2 This function is not supported in the standard firmware If you need please contact 4 12 2 UART2 RXD TXD For details please refer to chapter 4 6 Table 23 Pin definition of UART2 RXD TXD GPIO10 GPIO UART2_RXD GPIO12 68 GPIO UARI2 TXD 4 13
57. y Power management unit Frequency Analog Interface Digital Interface UART 46 lt gt Audio USB Analog Digital SIM E baseband baseband gt GPIO gt LCD SPI 2C lt 1 o gt Figure 1 SIM800F functional diagram SIMS800F Hardware Design V1 00 14 2015 07 31 E Qoe 606 Smart Machine Smart Decision 3 Package Information 31 Pin out Diagram 2B 4 T Ce BRE RR RBH SH ROPE EE BE So SESS dO oO sR 85595906 PWRKEY 1 GPIO10 GND 2 KBC1 UART1 DTR 3 KBC2 UARTI RI 4 KBC3 UARTI DCD 5 KBC4 NC 6 GND UARTI CTS 7 GND UARTI RTS 8 SIMS800F KBRO UARTI_TXD 9 1 VARTL_RXD 10 Top View 2 DISP CLK 11 i KBR3 DISP DATA 12 KBR4 DISP 13 GND DISP CS 14 SCL VDD_ExT 15 SDA NRESET 16 PWM2 GND 1 PWMI Q cw cb Ww uo Uo onc Rae 555 28 CB Ge ee wd AOR AY 8 un un Figure 2 SIM800F pin out diagram Top view SIMS800F Hardware Design V1 00 15 2015 07 31 Smart Machine Smart Decision 3 2 Pin Description Table 4 Pin description VBAT 55 56 57 I Power supply It is recommended to VRTC 26 IO Power supply for RTC connect with a
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