SIM800_Hardware Design_V1.05
Contents
1. 63 I PRS 63 64 III Terms and 65 IV iO 67 8 800 Hardware Design V1 05 4 2014 03 25 o lt 9006 Smart Machine Smart Decision Table Index dr 10 TABLE 2 CODING SCHEMES MAXIMUM NET DATA RATES OVER AIR INTERFACE 17 TABLE 3 OVERVIEW OF OPERATING MODES 12 MT P 13 TABLE 5 RECOMMENDED ZENER DIODE regu no aote 20 TABLE 6 ELECTRONIC CHARACTERISTIC OF THE 26 TABLE 7 THE CURRENT CONSUMPTION OF FUNCTION MODES BS PA MFRMS 5 27 TABLE 8 SERIAL PORT AND USB PIN 2 29 TABLE 9 SERIAL PORI CHARACTERISTICS 29 TABLE 10 VBUS OPERATION VOLTAGE tine toti ran tbe Ne ide 32 TABLE 11 MULTIPLEX FUNCTION OF SERIAL No eee2. oe ee 54 TN e uum 55 S SUI n 55 Electrical Reliability and Radio Characteristics 56 6 1 Absolute Maximum 56 6 2 Recommended Operating 56 6 3 Digital Interface Characteristics soot erede Eee FE Eee Eee ed eni a 56 6 4 SIM Card T tertace Characteristics Ne eene rer 21 6 5 DIVE VDD Characteristics 57 6 6 OLLI Iain UM 57 6 7 A CUT rb reu EP vb 57 6 8 Current Consumpti amp n 4 244 44 000 58 6 9 Bleettos5tatic ANNA N 59 ee 59 6 11 Modul nonas 60 6 12 Frequencies 60 7 d P img e 61 ra PM Bottom View of 5 61 1 2 Solder Reflow Profile DT 61 7 3 18 62 7 4 Pakne Reguirei Bis E 62 8 N E E
3. company of SIM Tech SIMS00 Hardware Design V1 05 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 1s 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 rights reserved in the event of grant of a patent or the registration of a utility model or design specification supplied herein are subject to change without notice at any time Copyright Shanghai SIMCom Wireless Solutions Ltd 2014 8 800 Hardware Design V1 05 2 2014 03 25 gt o o 3 i m E lt 2095999 2 5 2 s 8
4. Smart Machine Smart Decision FIGURE 47 GSM ANTENNA MATCHING CIRC ULT oisecesusunsasecunazucsbaveminessdesssnd ove e iuvat eer Spu teo ea platte ev Ro eie 52 FIGURE 48 GSM SIMPLE ANTENNA MATCHING CIRCUIT 52 FIGURE 49 BLUETOOTH ANTENNA MATCHING CIRCUIT 22222 2 2 2 4 2 4 9 2 418 1 0 15 11 1 53 FIGURE 50 AND BOTTOM VIEW OF 800 Es CERE tuse eu doom tuae eu 61 FIGURE Sk TYPICAL SOLDER REFLOW 4 4 1 61 8 800 Hardware Design V1 05 8 2014 03 25 o m 3 lt 2 ecce 3 3 o Smart Machine Smart Decision Version History SIM800 Hardware Design V1 05 9 2014 03 25 lt 9006 Smart Machine Smart Decision 1 Introduction This document describes SIM800 hardware interface in great detail This document can help user to quickly understand 5 800 interface specifications electrical and mechanical details With the help of this document and other SIM800 application notes user guide users can use SIM800 to design various applications quickly 2 8 800 Overview Designed for global market SIM800 is a quad band GSM GPRS module that works on frequencies GSM 850MHz EGSM 900MHz DCS 18
5. nee ee meee ee eee eee eee ners 43 2 10 3 TCD Display SPI 43 SIM800_Hardware Design V1 05 3 2014 03 25 n of SIM Tech A company Smart Machine Smart Decision 4104 SD 44 44 LS eae des 47 4 15 General Purpose Input Output GP lO 47 48 NO MEM Nc H 48 ANG Stans MAGICA OM 49 dd Oprane Stratus Indication 50 o 50 4 19 RF Synchronization Signal PNE 51 Walch a e 51 2 20 1 GSM nte npa ne DOG Gees 52 4 20 2 Bluetooth Antenna 52 5 54 5 1 PIN 54 5 2 Principle of PCB 54 54 20205 m 54 22 ME eee ce
6. 5 21 432 Deep Mode A TFFCSCLE NN 21 4 3 3 Wake Up SIM800 from Sleep Mode AT CSCLK 1 24 4 4 CT 28 4 5 Serial Port and USB Intertacg i We ROO 29 209 A 29 4 2 TE O 30 45 RNC 32 4 5 4 Software uu Debug E 33 455 Serial eoo iste DIR ID DID pa etes 33 4 6 4 y 34 MON T S aaa EE 35 Interfaces COBITgUP 36 4 7 2 Microphone Interfaces 0 8 36 4 7 3 Audio Electronic 37 A HH 37 4 8 Jed OO Wats 37 4 9 ANEC ar WiC Ce 38 NER ROOTED 38 492 SIM Card Design 39 4 9 3 Design Considerations for SIM Card 39 077 41 4 10 1 Multiplex 42 SML EE
7. lt 9006 Smart Machine Smart Decision Figure Index FIGURE 1 SIM500 FUNC TIONAL DIAGRAM seciscncnctcs 13 FIGURE 2 SIM800 PIN OUT DIAGRAM TOP VIEW csssssssssssssccccccesssssscsssrscsnsnsnsscccccesssesssssssnaceaaonsssccaceessseses 14 FIGURE 3 DIMENSIONS OF SIM500 UNIT MIND 18 FIGURE 4 RECOMMENDED PCB FOOTPRINT OUTLINE UNIT 19 FIGURE S REFERENCE CIRCUIT THE INPUT ii csoxoisdesssecientenecalwanzonssownreeacwentucdeeepuatpansonaneanreenteeeteciesuprdes 20 FIGURE 6 REFERENCE CIRCUIT OF THE POW ER SUPPLY 20 FIGURE 7 REFERENCE CIRCUIT OF THE DC DC POWER SUPPLY 21 FIGURE 8 VBAT VOLTAGE DROP DURING TRANSMIT 21 FIGURE 9 THE MINIMAL VBAT VOLTAGE REQUIREMENT AT VBAT 22 FIGURE 10 POWER ON DOWN MODULE USING 22 FIGURE 11 POWER ON DOWN MODULE USING eene genres 23 125 yen ta eee ve PU res boire 23 FIGURE 13 TIMING OF PO
8. 2 3j 2 s 8 25 00 24 00 1 00 4 PITCH URN BEER SIE E Ka LL 60 e First pad fy 4 00 A lt lt uh 912 15 out Area 15 Ah Keep out Area C 425 CUR Al ox quus Gu C E Ad quus 25 qu 15 C 18 42 euh he _SIMB00 Area 180 er et ed ete es 4 00 N Keep out Area Figure 4 Recommended PCB footprint outline Unit mm 8 800 Hardware Design V1 05 19 2014 03 25 4 Application Interface 9006 Smart Machine Smart Decision 4 1 Power Supply The power supply range of SIM800 15 from 3 4V to 4 4V Recommended voltage 15 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 input a bypass capacitor low ESR such as a 100uF is strongly recommended 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 to SIM800 VBAT pins as possible VBAT 33pF 10 D 50 Figure 5 Reference circ
9. 4 Table 45 Current consumption In above table the current consumption value 15 the typical one of the module tested in laboratory In the mass production stage there may be differences among each individual SIMS800 Hardware Design V1 05 2014 03 25 Smart Machine Smart Decision 6 9 Electro Static Discharge 5 800 is an ESD sensitive component so more attention should be paid to the procedure of handling and packaging The ESD test results are shown in the following table Table 46 The ESD characteristics Temperature 25 Humidity 45 6 10 Radio Characteristics The following table shows the module conducted output power it 15 fo TS 05 05 technical specification requirement Table 47 GSM 900 and GSM 850 conducted RF D SIM800 Hardware Design V1 05 59 2014 03 25 Smart Machine Smart Decision Table 48 DCS 1800 and PCS 1900 conducted RF output power 6 11 Module RF Receive Sensitivity The following table shows SIM800 ted receive sensitivity it is tested under static condition tivi Table 49 Conducted RF receive dosi Y 6 12 rating Frequencies The table shows module s operating frequency range it 1s followed by 3GPP TS 05 05 technical specification requirement Table 50 Operating frequencies QN SIM 800 Hardware Design V1 05 2014 03 25 company of SIM Tech 7 Manufacturing 7 1
10. roni Pos Fon 47 TABLE 27 PIN DEFINITION OP TRE DN DEDE UE DEC a 48 TABLE 48 TABLE 292 PIN DEFINITION THE PW MM 48 TABLE 30 BUZZER 49 TABLE 31 PWM TUNC DIDI docecedadadtsencaeiesidecesneseatebedndeasiaess 49 TABLE 32 PIN D amp INNITNON OF THE 49 TABLE 33 ND IHE NETLIGHT PIN oa otcatctescsissetanse rod edentuo tuu dedo deo 49 TABLE 34 PIN DEWINITION OF THE 5 dee nn ea ee dne peu eds Haee ro 50 DEFINITION OF THE eras Sateen tested 50 TABLE SONEPLED SPECGIFKATION T I 51 TABLE 37 DEFINITION OF THE 5 51 TABLE 38 ABSOLUTE MAXIMUM 56 TABLE 39 RECOMMENDED OPERATING 56 TABLE 40 DIGITAL INTERFACE 5 56 TABLE 41 SIM CARD INTERFACE ceo basse nac odo 37 TABLE 42 S
11. Echo Cancellation Noise Suppression Serial port Full modem interface with status and control lines unbalanced asynchronous 1200bps to 115200bps Can be used for AT commands for data stream Support RTS CTS hardware handshake and software ON OFF flow control Multiplex ability according to GSM 07 10 Multiplexer Protocol Autobauding supports baud rate from 1200 bps to 57600bps USB interface Can be used as debugging and firmware upgrading Support phonebook types SM FD LD RC ON MC Support SAT class 3 GSM 11 14 Release 99 Support RTC Can be set by AT command 517 24 24 3 Weight 3 2g Firmware upgrading by serial port and USB interface 2014 03 25 e A compa om Tech lt gt lt Smart Machine Smart Decision Table 2 Coding schemes and maximum net data rates over air interface Coding scheme CS 1 CS 2 CS 3 5 4 1 timeslot 9 05kbps 13 4kbps 15 6kbps 21 4kbps 2 timeslot 4 timeslot 18 1kbps 36 2kbps 26 8kbps 53 6kbps 31 2kbps 62 4kbps 42 8kbps 85 6kbps 2 2 Operating Modes The table below summarizes the various operating modes of SIM800 Table 3 Overview of operating modes Mode Normal operation Power down Minimum functionality mode SIMS800 Hardware Design V1 05 Function GSM GPRS SLEEP GSM IDLE GSM TALK 5 STANDBY GPRS DATA Module will automatically go into sleep mode if the conditio
12. Note Do not pull up RF SYNC The timing of the synchronization signal 15 shown in the following figure High level of the RF SYNC signal indicates increased power consumption during transmission 2201081 576 5 Burst RF SYN Figure 46 RF SYNC signal during transmit burst 4 20 Antenna Interface There are two antenna ports for SIM800 GSM antenna port named RF ANT and Bluetooth antenna port named ANT BT The RF interfaces of the two antenna ports both have the impedance of 500 Theinput impendence of the antenna should be 500 and the VSWR should be less than 2 Itisrecommended that GSM antenna and Bluetooth antenna be placed as far as better Theisolations of the two antenna should be more than 30db NOTE About the RF trace layout please refer to SMT Module RF Reference Design Guide SIMS800 Hardware Design V1 05 5 2014 03 25 609 n of SIM Tech A company Smart Machine Smart Decision 4 20 1 GSM Antenna Interface There is a GSM antenna pad named RF 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 15 necessary the connection 15 recommended as following GSM Antenna Module
13. 1 4 2 3 Reset Function 5 800 also have RESET pin used to reset the module This function is used as an emergency reset only when AT command AT CPOWD I and the PWRKEY pin have no effect User can pull the RESET pin to ground and then the module will restart This pin is already isolated in the module so the external isolation is not necessary Following figure 15 internal circuit of the RESET pin 8 800 Hardware Design V1 05 25 2014 03 25 gt o o 3 i m E lt 2095999 E 3 2 s 8 Smart Machine Smart Decision Reset circuit Module Figure 14 Reset circuit The typical value of RESET pin high level is 2 8V so for the 3V or 3 3V customer could use MCU s GPIO to driver this pin directly resistor in serial the RESET signal could enhance the ESD performance but the value should not be too high otherwise the level of RESET could be lower than threshold value RESET hardware parameters can refer to the following table Table 6 Electronic characteristic of the RESET Pin Pin name Symbol Min Typ Max Unit Vin DI 2 8 2 9 V RESET Vit 0 6 V Tull down 105 ms The reset scenarios are illustrated in the following figures Tout down gt 1 05mS Max lt 0 6V 800mS VDD EXT ES 154000 STATUS Figure 15 Reset timing sequence 8 800 Hardware Design V1 05 26 2014 03 25
14. Figure 47 GSM antenna matchine circuit R101 C101 C102 are the matching circuit the values depend on antenna debug result Normally R101 is 00 C101 and C102 are not mounted The RF connector is used for conducted test If the space between RF pin and antenna is not enough the matching circuit could simplified as the following figure GSM Module E Antenna R101 Figure 48 GSM simple antenna matching circuit Normally R101 15 00 C101 and C102 are not mounted 4 20 2 Bluetooth Antenna Interface The module provides a Bluetooth antenna interface named ANT BT The external antenna must be matched properly to achieve best performance so the matching circuit 15 necessary the connection is recommended as the following figure SIMS800 Hardware Design V1 05 52 2014 03 25 e A company om Tech gt lt Smart Machine Smart Decision GN Module R20 Yanim ANT BT O T ch 201 T C202 GN H gt Figure 49 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 8 800 Hardware Design V1 05 53 2014 03 25 company of SIM Tech 5 PCB Layout Smart Machine Smart Decision Usually most electronic products with good performance are based on good PCB layout Poor PCB layout will
15. RDY This URC does not appear when autobauding function is active Note User can use AT command 1 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 SIM800 is powered on For details please refer to the chapter AT IPR in document 1 4 2 2 Power down SIM800 SIM800 will be powered down in the following situations Normal power down procedure power down SIM800 by the PWRKEY pin Normal power down procedure power down SIM800 by AT command AT CPOWD 1 SIMS800 Hardware Design V1 05 23 2014 03 25 960 of Smart Machine Smart Decision Abnormal power down over voltage or under voltage automatic power down Abnormal power down over temperature or under temperature automatic power down 4 2 2 1 Power down SIM800 by the PWRKEY Pin User can power down SIM800 by pulling down the PWRKEY pin for at least 1 second and then release Please refer to the power on circuit The power down sequence is illustrated 1n following figure 1 69 PWRKEY down gt 15 a VIL Max lt 1 7V VDD EXT P ae STATUS 0 WM Main Serial Active Undefined port Figure 13 Timing of power down SIM800 PWRKEY Note When module is powered off by pulling down PWRKEY
16. lead to lots of issues like TDD noise SIM card undetected etc The final solution for these problems 15 to redo PCB layout Making good PCB layout will save developing schedule and cost as well This section will give some guidelines on PCB layout in order to eliminate interfere or noise by greatest degree and save product development period 5 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 figure 2 for the details 5 2 Principle of PCB Layout During layout we should pay attention to the following interfaces like Antenna power supply SIM card interface audio interface and so on 5 2 1 Antenna There are some suggestions for components placing and RF routing of GSM and Bluetooth RF traces The RF connector is used for conducted test so keep it as close to the RF ANT pin as possible Antenna matching circuit should be closed to the antenna Keep RF traces as 500 The RF traces should be kept far away from the high frequency signals and strong disturbing source If using a RF cable kept it far away from SIM card power ICs It is recommended that GSM antenna and Bluetooth antenna be placed as far as better 5 2 2 Power Supply Not only VBAT but also power ground is very important in layout The positive line of VBAT should be as shorter and wider as possible The correct f
17. the pull down time exceeds 33 seconds will course the module power up This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut down Before the completion of the power down procedure the module will send URC NORMAL POWER DOWN At this moment AT commands can not be executed any more and only the RTC is still active Power down mode can also be indicated by STATUS pin which 15 low level at this time 4 2 2 2 Power down SIM800 by AT Command 5 800 can be powered down by AT command AT CPOWD 1 This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut down Before the completion of the power down procedure the module will send URC NORMAL POWER DOWN At this moment AT commands can not be executed any more and only the RTC is still active Power down mode can also be indicated by STATUS pin which 15 at low level at this time For details about the AT command please refer to document 1 8 800 Hardware Design V1 05 24 2014 03 25 of SIM Tech A company Smart Machine Smart Decision 4 2 2 3 or Under voltage Power down The module software monitors the VBAT voltage constantly If the voltage lt 3 5V the following will be reported UNDER VOLTAGE WAR
18. 0 1 V 2 8 V Contains data lines TXD RXD hardware flow control lines RTS and CTS status lines DCD and RI Serial port can be used CSD FAX GPRS service and AT communication It can also be used for multiplex function For details about multiplex function please refer to table 11 Serial port supports the following baud rates 1200 2400 4800 9600 19200 38400 57600 and 115200bps Autobauding only supports the following baud rates 1200 2400 4800 9600 19200 38400 57600 and 115200bps The default setting is autobauding SIMS800 Hardware Design V1 05 29 2014 03 25 609 n of SIM Tech A company Smart Machine Smart Decision Autobauding allows SIM800 to automatically detect the baud rate of the host device Pay more attention to the following requirements Synchronization between DTE DCE When DCE powers on with autobauding enabled firstly user must send character or to synchronize the baud rate It is recommended to send AT until DTE receives the OK response which means DTE and DCE are correctly synchronized For more information please refer to the AT command Restrictions of autobauding operation The DTE serial port must be set at 8 data bits no parity and 1 stop bit The URC such as RDY CFUN 1 and CPIN READY will not be reported Note User can use AT command AT IPR x
19. De 33 TABLE C d cece 34 TABLE 13 AUDIO INTERFACE DEFINITION s icis cas Seo ertet e rasoir tola eoe ene 35 TABLE 14 MICROPHONE INPUT 5 222 37 TABLE 15 AUDIO OUTPUT 5 422222222 0446 37 LADLB I6 SIMEPIN DEPUINDLIOGODN e ao 38 TABLE 17 PIN DESCRIPTION MOLEX SIM CARD 40 TABLE 18 PIN DESCRIPTION AMPHENOL SIM CARD 4 TABLE 19 PROM PIN DEFINITION o ne 41 TABLE 20 PCM SPECIFICATION o ses 42 TABLE 21 PCM MULTIPLEX FUNCTION senteraro AE o ioter 42 TABLE 22 PIN DEFINITION OF THE 2 46 TABLE 23 KEYPAD MULTIPLEX 46 TABLE 24 PIN DEFINITION OF THE eennnsessssssrnrrsrsrrrrrresssssssasnsssssrrreerssssssaansssestrrreesssesssaannsesereree 47 TABLE 23 2C MULADPLEX PUNC 5 47 TABLE 26 PIN DEFINITION OF THE
20. Port If full modem function is not used the UART port could be configured to two serial ports without flow control the details could be founded in the following table Table 11 Multiplex function of serial port Name Pin Mode 0 default Mode 1 UART DTR 3 UART DTR GPIO22 UART RI 4 UART RI GPIO23 UART DCD 5 UART DCD GPIO24 CTS fi CTS URXD2 IN RTS 8 RTS UTXD2 OUT SIM800 Hardware Design V1 05 33 2014 03 25 Smart Machine Smart Decision Note Multiplex Function needs different software version 4 6 RI Behaviors Table 12 RI Behaviors The behavior of the RI pin is shown in the followi module is used as a receiver HIGH stablish the call ang up the call stablish the call ang up the call Idle Ring Figure 27 RI behaviour of data calling as a receiver SIM800_ Hardware Design_V1 05 34 2014 03 25 e A company om Tech gt lt Smart Machine Smart Decision 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 cca OW We Ring Establish TM the call the call Figure 29 RI behaviour as a caller 4 7 Audio Interfaces SIM800 provides one analog input which could be used for electret microphone The module also provides one analog output The output can directly drive 32Q receiver Table 1
21. SPEAKER eo Sun MORE Ee pueda do 36 FIGURE 312 MICKOPMONE REFERENCE CIRCUIT es pido x tus anni 36 FIGURE 32 REFERENCE CIRCUIT OF THE 8 PIN SIM CARD eere 38 FIGURE 33 REFERENCE CIRCUIT OF THE 6 PIN SIM CARD eere 39 FIGURE 94 MOLEX 91225 SIM CARD 40 FIGURA 3604 MPHENOL C707 10M006 5122 SIM CARD 41 FIGURE 36CM REFERENCE Cin 3 55 3 4 43 BN Ce 43 FIGURE REFERENCE 44 FIGURE 39 TRADITIONAL KEYPAD REFERENCE 44 FIGURE 40 EXTENDED KEYPAD REFERENCE CIRCUIT 45 FIGURE 41 ENHANCE THE ESD PERFORMANCE OF KEYPAD 45 FIGURE 42 KEYPAD DETEC tet emer Meer ae ne au ee unici ere 46 FIGURE 43 REFERENCE CIRCUIT OF PWM DRIVE BUZZER 49 FIGURE 44 REFERENCE CIRCUIT OF 4 4 4 45 PLUME EP ER a 50 FIGURE 45 KPLED DRIVER REFERENCE 50 FIGURE 46 SYNC SIGNAL DURING TRANSMIT 5 SIMS800 Hardware Design V1 05 2014 03 25 m
22. Smart Machine Smart Decision Contents Version e 9 1 PGE OCU COO S 10 2 10 2 1 5 800 Key 10 2 2 Opera Modes RR 12 23 el mm 13 3i ec 14 3 1 14 222 Pin DesctipHODl ts ttbi 15 3 3 Pac kape 18 4 niim eases m 20 4 logge M m 20 016 21 4 1 2 Monitoring Power Supply 22 4 2 POW ClO COW 22 duum 27 m 23 4 2 3 Reset lt 25 4 3 Power Saving Re ot 27 2359
23. and SDM20U40 If the voltage of UART is 5V on customer side customer can use the following reference circuits VDD EXT Module Customer Figure 22 TX level converting by transistor 8 800 Hardware Design V1 05 31 2014 03 25 e A company om Tech gt lt Smart Machine Smart Decision VDD EXT Module Customer Figure 23 RX level converting by transistor Note The recommend Transistors part numbers are 28C4617TLR and 8 1157 when update firmware via the TXD RXD circuit as figure 22 and figure 23 shows customer should make surethe VDD EXT has voltage output or a external LDO should be added to power VDD EXT 4 5 3 USB Interface USB interface supports software debug function When power on the module connect VBUS USB USB DM and GND to PC then install the driver successfully port could be recognized by the customer could achieve the software Debug purpose with this UART port The following diagram 1s recommended Figure 24 USB reference circuit The maximum allowable cap load of TVS on USB data line should be less than 5pF e g ESD9L5 0ST5G and ESD9MS5 0ST5G The USB DP and USB DM should be routed in differential traces Note please reserve the USB interface or test point for debug Table 10 VBUS operation voltage Pin Min Typ Max Unit VBUS 4 3 5 7 V Note VBUS is only used for USB inserting detection can not be used as a p
24. capacitor Non chargeable battery backup Module Non chargeable Backup Battery Figure 17 RTC supply from non chargeable battery Rechargeable battery backup Module Rechargeable Backup Battery Figure 18 RTC supply from rechargeable battery SIMS800 Hardware Design V1 05 28 2014 03 25 060 RE of SIM Tech Acompany 4 5 Serial Port and USB Interface Smart Machine Smart Decision SIM800 provides one unbalanced asynchronous serial port The module is designed as DCE Data Communication Equipment The following figure shows the connection between module and client DTE Table 8 Serial port and USB pin definition Name Pin number UART DTR 3 UART RI 4 UART DCD 5 Serial port CTS 7 RTS 8 TXD 9 RXD 10 VBUS 24 USB USB DP 27 interface USB DM 28 Function Data terminal ready Ring indicator Data carrier detect Clear to send Request to send Transmit data Receive data USB power supply USB data line positive USB data line minus Note Hardware flow control is disabled by default The AT command 2 2 can enable hardware flow control The AT command 0 0 disable hardware flow control For more details please refer to document 1 Table 9 Serial port characteristics Symbol Min Vir 0 OS Vor 0 2 4 5 1 Function of Serial Port Serial port Full modem device Max Unit 0 3 V 2 8 V
25. level and without interrupt on air and hardware such as GPIO interrupt or data in serial port 5 800 will enter sleep mode automatically In this mode 5 800 can still receive paging or SMS from network but serial port is not accessible Note Autobauding is the default setting Module can not enter sleep mode if the baud rate of MCU s serial port not synchronous with module after module power on 4 3 3 Wake Up SIM800 from Sleep Mode AT CSCLK 1 When SIM800 is in sleep mode AT CSCLK 1 the following methods can wake up the module Pull down DTR pin The serial port will be active after DTR pin 15 pulled to low level for about 50ms Receive a voice or data call from network Receive a SMS from network Receive external interrupt 8 800 Hardware Design V1 05 2014 03 25 609 n of SIM Tech A company 4 4 RTC Backup Smart Machine Smart Decision VRTC 15 an input pin when the VBAT 15 not supplied by external power When the VBAT power supply is in present and the backup battery is in low voltage state VRTC can charge the backup battery The RTC power supply of module can be provided by an external capacitor or a battery non chargeable or rechargeable through the VRTC The following figures show various reference circuits for RTC back up External capacitor backup Module Large capacitance Figure 16 supply from
26. something to do with GND signal surely if GND signal issued not good lots of high frequency noise will interfere MIC and speaker over bypass capacitor So take care of GND well during PCB layout 4 8 Bluetooth SIMS00 supports Bluetooth function customer only needs to design the Bluetooth antenna and then customer operate Bluetooth conveniently by AT commands For the detail commands about Bluetooth please refer to document 1 8 800 Hardware Design V1 05 37 2014 03 25 gt o o 3 i m E lt 2095999 3 2 s 8 Smart Machine Smart Decision Fully compliant with Bluetooth specification3 0 EDR 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 Supports PCM interface and built in programmable transcoders for liner voice with transmission 4 9 SIM Card Interface The SIM interface complies 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 The SIM interface 15 powered from an internal regulator in the module 4 9 1 SIM Card Application Table 16 SIM pin definition Name Pin function VSIM 30 Voltage supply for SIM card Support 1 8V or 3V SIM card SIM DATA 3 SIM data input output SIM CLK 32 SIM clock SIM RST 33 SIM reset SIM PRE 34 SIM card detection It 15 r
27. 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 I and CPIN READY will be reported when 81 800 is powered on 4 52 Serial Port The following figure shows the connection between module and client D TE Module DCB Customer DTE Serial port Serial port TXDc gt TXD RXD 594 RTS CTS UART DIR UART DCD DCD UARTI RING Figure 19 Connection of the serial port If the voltage of VART 15 3 3V the following reference circuits are recommended If the voltage 15 3 0V please change the resistors in the following figure from 5 6K to 14K SIM800 Hardware Design V1 05 30 2014 03 25 e A company om Tech gt lt Smart Machine Smart Decision HIS CTS GPI EINT GPI O MCU ARM 3 3V Figure 20 Level converting by resistor If the voltage of UART is 3V or3 3V user also can use following reference circuits Module VDD EXT Q Figure 21 Isolation circuit by diodes Note when a diode used to isolate voltage cross customer should notice that there s voltage drop on the diode And the signals voltage level should meet the customer s electrical character The recommend diode is Schottky diode e g RB551V 30TE 17
28. 00MHz and PCS 1900MHz SIM800 features GPRS multi slot class 12 class 10 optional and supports GPRS coding schemes CS 1 CS 2 CS 3 and 5 4 With a tiny configuration of 24 24 3mm SIM800 can meet almost all the space requirements in users applications such as M2M smart phone PDA and other mobile devices 5 800 has 68 SMT pads and provides all hardware interfaces between the module and customers boards Support up to 5 5 2 Keypads One full function UART port and can be configured to two independent serial ports One USB port can be used as debugging and firmware upgrading Audio channels which include a microphone input and a receiver output Programmable general purpose input and output One SIM card interface Support Bluetooth function support one PWM PCM SPI SD card interface only one function can be accessed synchronously default function 15 PCM SIM800 is designed with power saving technique so that the current consumption is as low as 1 in sleep mode SIM800 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 11 2 1 SIMS800 Key Features Table 1 SIM800 key features Feature Implementation Power supply 3 4V 4 4V Power saving Typical power consumption in sleep mode is 1 0mA BS PA MFRMS 9 SIMS00 Quad band GSM 850 EGSM 900 DCS 1800 PCS 1900 SIM
29. 3 Audio interface definition Pin name Pin number Function MICP 19 Main Audio input positive Audio MICN 20 Main Audio input negative channel SPKP 21 Main Audio output positive SPKN 22 Main Audio output negative is used to adjust the input gain level of microphone AT SIDET is used to set the side tone level In addition 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 8 800 Hardware Design V1 05 35 2014 03 25 gt o o 3 i m E lt 2095999 5 2 s 8 Smart Machine Smart Decision 4 7 1 Speaker Interfaces Configuration Close to speaker GND _ GND 10pF 33pF Hes Modul SPKP oqu 10 33pF SPKN ESD 10pF Figure 30 Speaker reference circuit 4 7 2 Microphone Interfaces Configuration ESD 10pF 33pF ANTI 4 Differential trace and Module gt shielding by GND MICN Figure 31 Microphone reference circuit 8 800 Hardware Design V1 05 36 2014 03 25 e A compal om ech 3 5 Smart Machine Smart Decision 4 7 3 Audio Electronic Charac
30. 800 can search the 4 frequency bands automatically The frequency bands also can be set by AT command For details please refer to document 1 Compliant to GSM Phase 2 2 Frequency bands 8 800 Hardware Design V1 05 10 2014 03 25 Transmitting power GPRS connectivity Temperature range Data GPRS CSD USSD SMS SIM interface External antenna Audio features Serial port and USB interface Phonebook management SIM application toolkit Real time clock Alarm function Physical characteristics Firmware upgrade SIMS800 Hardware Design V1 05 11 Smart Machine Smart Decision Class 4 2W GSM850 EGSM900 Class 1 1W DCS1800 PCS1900 GPRS multi slot class 12 default GPRS multi slot class 1 12 option Normal operation 40 C 85 C Storage temperature 45 C 90 C 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 CSD transmission rates 2 4 4 8 9 6 14 4 kbps Support CSD transmission Unstructured Supplementary Services Data USSD support MT MO CB Text and PDU mode SMS storage SIM card Support SIM card 1 8V 3V Antenna pad Speech codec modes Half Rate ETS 06 20 Full Rate ETS 06 10 Enhanced Full Rate ETS 06 50 06 60 06 80 Adaptive multi rate AMR
31. GPIOS 2 73 43 ROWI GPIO4 RED 10 View 42 ROWZIGPIO3 GPIOW p 77 ROWSIGPIO2 PCM IN 12 ROWRA GPIO GPIOI3 131 39 GND PCM SYNC 7 38 SCL VDD EXT 15 cu 37 SDA RESET lap 38 PWMZ GPIO23 GHD 7 35 PWMLIZVGPIO22 TENE NUN UM UNIT eal eal eal eal RI cal cal S ca 5 SIM PRESENCE Figure 2 SIMS 00 pin out diagram Top view 8 800 Hardware Design V1 05 14 2014 03 25 s Acompany of SIM Tech Smart Machine Smart Decision 3 2 Pin Description Table 4 Pin description SIM800_Hardware Design_V1 05 2014 03 25 Smart Machine Smart Decision en 1 05 Com f SIM Tech SIM800 Hardware Desi Acompany e ec ee v SM Smart Machine Smart Decision SIM800_Hardware Design_V1 05 17 2014 03 25 3 209999 Smart Machine Smart Decision 3 3 Package Dimensions AY SEE DETAL B V 0 60012 Ly SOLDER MASK 0 29 SOLDER MASK 0 28 0 72 0 08 Ne 0724009 _ DETAL DETAL B SCALE Sil SCALE 51 Figure 3 Dimensions of SIM800 Unit mm 8 800 Hardware Design V1 05 18 2014 03 25 1783005 Smart Machine Smart Decision gt o 3 E E ecce
32. IM VDD 57 TABLE 43 VDD D 55 3 TABLE 442 VRIC CEEABRACIBRISTICS 57 TABLE 45 CURRENT CONSUMPTION 58 TABLE 46 THE ESD CHARACTERISTICS TEMPERATURE 25 C HUMIDITY 45 59 8 800 Hardware Design V1 05 5 2014 03 25 n of SIM Tech A company Smart Machine Smart Decision TABLE 47 GSM 900 GSM 850 CONDUCTED RF OUTPUT POWER 59 TABLE 48 DCS 1800 AND PCS 1900 CONDUCTED RF 00 60 TABLE 49 CONDUCTED RECEIVE SENSLEIVEDY da dumis 60 TABLE S0 OPERATING FREQUENCIES 8 58 Un estet ete 60 TABLE 51 MOISTURE CLASSIFICATION LEVEL AND FLOOR LIFE 1 1 1 4414 nennen nnns 62 TABLE 52 BAKING REQUIREMENTS I 62 TAB GE RELATE pO Vy eE ERN T R E E 63 TABLE 34 MULTIPLEX FUNE HON 04 TABLE 55 TERMSAND ABBREVIATION Spone i 65 iE VES CAUTION T 67 8 800 Hardware Design V1 05 6 2014 03 25 o
33. INAL 0 15 PHOSPHOR BRONZE D luum MIN OVER CONTACT AREA MIN Sm SMT TAILS V PUSH BUTTON SPRING ETT SY PUSH ROD 0 4 STAINLESS STEEL r1 icm 1 sre LEVER 04 STAINLESS STEEL 2 5 THIRD ANGLE PROJECTION REVISE ONLY ON CAD SYSTEM JIM NE NYLON 46 TELLOW 26 0 REF TYP CONT HEIGHT TITLE 2 SIM CONNECTOR e cemere rs 8 53 Figure 34 Molex 91228 SIM card holder Table 17 Pin description Molex SIM card holder Pin name Signal Description Cl VSIM SIM card power supply C2 SIM RST SIM card reset C3 SIM CLK SIM card clock C3 GND Connect to GND C5 GND Connect to GND C6 VPP Not connect C7 SIM DATA SIM card data I O C8 SIM PRE Detect SIM card presence For 6 pin SIM card holder SIMCom recommends to use Amphenol C707 10 006 5122 User can visit http www amphenol com for more information about the holder SIM800 Hardware Design V1 05 40 2014 03 25 gt 3 3 3 lt 2 3 88 5 T Smart Machine Smart Decision SIM CARD ACCORDING 70 CSM 11 11 4 180 CARD INPUT AREA DURING LOCKING OPERRATION Figure 35 Amphenol om 5122 SIM card hold
34. NNING 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 down UNDER VOLTAGE POWER DOWN If the voltage gt 4 4V the following will be reported and the module will be automatically powered down OVER VOLTAGE POWER DOWN At this moment AT commands can not be executed any more and only the RTC is still active Power down mode can also be indicated by STATUS pin which 15 low level at this time 4 2 2 4 Over temperature or Under temperature Power down The module will constantly monitor the temperature of the module If the temperature gt 80 C the following URC will be reported CMTE 1 If the temperature lt 30 C following will be reported 1 If the temperature gt 85 C the following URC will be reported module will be automatically powered down 2 If temperature 40 C the following will be reported and module will be automatically powered down CMTE 2 At this moment AT commands can not be executed any more and only the RTC 15 still active Power down mode can also be indicated by STATUS pin which is at low level at this time Note Temperature detection is disable by default the AT command AT CMTE could be used to read the temperature when the module is running For details please refer to document
35. WER DOWN SIM800 BY PWRKEY 24 FIGURE TERESE CCIR UO s c 5 26 FIGURE T5 RESET TIMING SEQUENCE Urdu 26 FIGURE 16 RTC SUPPLY FROM CAPAC TOR ptores tte Ne sono 28 FIGURE 17 RTC SUPPLY FROM NON CHARGEABLE BATTERY 5 28 FIGURE 18 RTC SUPPLY FROM RECHARGEABLE BATTERY 4 5 28 FIGURE 19 CONNECTION OF THE SERIA bo POR T qan Dp Y iUas 30 FIGURE 29 LEVEL CONVERTING BY RESISTOR 31 FIGURE ZI ISOEATION CIRCUIT BY DIODES creron E 31 FIGURE 22 TX LEVEL CONVERTING BY nnne nnne enne nennen 21 FIGURE 23 RX LEVEL CONVERTING BY TRANSISQOR 3 32 FIGURE USD REFERENCE CIRCUIT Nos Ger enn rant ene ee 32 FIGURE 25 CONNECTION FOR SOFT WARE GDONSA DING 33 FIGURE 26 RI BEHAVIOUR OF VOICE 2 4 1120 6 2 000000000000000 34 FIGURE 27 RI BEHAVIOUR OF DATA OALUING AS 34 FIGURE 28 RI BEHAVIOUR OF URQOB RECEIVE SMS 35 FIGURE 29 RIL BEHAVIOUR MO A 3 4 EE EEE Ee 35 FIGURE 30
36. and Bottom View of SIMS00 Figure 50 and Bottom View of SIM800 7 2 Typical Solder Reflow Profile Smart Machine Smart Decision 250 200 3 5 150 amp a 100 d soj Primary 0 50 100 200 250 Forecast 0 53 105 TIME SEC 211 263 TCs RAMP SOAP Between 150 to 210 Reflow 2207 Peak Temperature CT n EN 14 7 994 31 538 38 243 62 E 14 496 100 5 35 515 15 2410 20 14 5 101 4 3896 4 4496 2447 0 I Different in Temp 004 TS GA 14 7 99 4 3196 53 8 3896 243 1 62 4 100 5 3596 51 5 1596 241 0 20 sd 1 4 5 101 4 38 544 4496 2447 8 y Differentin Temp 54 219 22 8 4 Figure 51 Typical Solder Reflow Profile Note Please refer to Module secondary SMT UGD for more information about the module shipping and manufacturing SIMS800 Hardware Design V1 05 61 2014 03 25 of SIM Tech A company 7 3 Moisture Sensitivity Level 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 1f the above conditions are not met Table 51 Moisture classification level and floor life Level Floor Life out of bag at factory amb
37. ard firmware If user wants this function the firmware must be customized Please contact SIMCom for more details 8 800 Hardware Design V1 05 43 2014 03 25 m n Smart Machine Smart Decision 4 10 4 SD Card Interface Module Figure 38 SD reference circuit If the VDD of SD card 15 2 8V user can use VDD EXT power the SD card directly If the VDD is 3 3V customer should design the power circuit external 4 11 Keypad Interface 5 800 consists of 5 keypad column outputs and 5 keypad row inputs and it can support two kinds of connections the traditional 5 5 keypad matrix and the extended 5 5 2 keypad matrix cue p 5 1 910194010 mo Q1 Q1 Q 11 919101010 _ 01010 0 0 Figure 39 Traditional keypad reference circuit Note According to the traditional 5 5 keypad matrix when there are unused COLs or ROWS user can execute AT command to define unused COLs and ROWs as GPIO for details please see the document 1 SIMS800 Hardware Design V1 05 44 2014 03 25 a of SIM Tech A company Smart Machine Smart Decision Module supports a new keypad connection it can support 5 5 2 amount 50 keypads meet full keyboard demand and the connection diagram 15 as follow EUM COLAC 20K 20K Module ROWOO oO o ROW Figure 40 Extended keypad refere
38. e 33 Status of the NETLIGHT pin Off SIM800 is not running 64ms On 800ms Off SIM800 not registered the network 64ms On 3000ms Off SIM800 registered to the network 64ms On 300ms Off GPRS communication is established Reference circuit 15 recommended in the following figure SIM800_Hardware Design V1 05 49 2014 03 25 Qe 3 company of SIM Tech Smart Machine Smart Decision Module NETLIGHT O Figure 44 Reference circuit of NETLIGHT 4 17 Operating Status Indication The STATUS pin indicates the operating status of module The pin output high when module power on output is low when module powered off Table 34 Pin definition of the STATUS STATUS Operating status indication 4 18 KPLED SIM800 provides one open drain LED driver pin Table 35 Pin definition of the KPLED KPLED Sink current for keypad LED Reference circuit 15 recommended in the following figure VBAT Module Figure 45 KPLED driver reference circuit 8 800 Hardware Design V1 05 50 2014 03 25 609 n of SIM Tech A company Smart Machine Smart Decision Table 36 KPLED specification Pin name Min Typ Max Unit KPLED 60 100 mA 4 19 RF Synchronization Signal The synchronization signal serves to indicate growing power consumption during the transmit burst Table 37 Definition of the RF SYNC pin Pin name Pin number Description RF SYNC 67 Transmit synchronization signal
39. e stress ratings under non operating conditions Stresses beyond any of these limits will cause permanent damage to SIMS00 Table 38 Absolute maximum ratings VBAT V Peak Current 0 2 0 A VBUS 30 V Ie 8 mA Io 8 mA These parameters are for digital interface pins such as keypad GPIO I2C UART and PCM 6 2 Recommended Operating Conditions Table 39 Recommended operating conditions VBAT Power supply voltage Operating temperature 40 125 85 Storage temperature 45 90 6 3 Digital Interface Characteristics Table 40 Digital interface characteristics Vin High level input current V Low level input current 0 3 0 7 V High level output voltage 2 4 V Vor Low level output voltage 0 4 V These parameters are for digital interface pins such as keypad GPIO I2C UART LCD and PCM 8 800 Hardware Design V1 05 56 2014 03 25 Smart Machine Smart Decision 6 4 SIM Card Interface Characteristics Table 41 SIM card interface characteristic 6 5 SIM VDD Characteristics Table 42 SIM VDD characteristics 4 9 6 6 VDD EXT Characterstes Table 43 MESSA N SIM800_Hardware Design_V1 05 2014 03 25 oes Com ner ree Smart Machine Smart Decision 6 8 Current Consumption
40. ecommended to use an ESD protection component such as PHILIPS www ohilips com IP42220CZ6 The SIM peripheral circuit should be close tothe socket The reference circuit of the 8 pin SIM card holder 15 illustrated in the following figure VDD E 4 7 MOLEX 91228 SIN RS OSIMEC RST VPP SIM DA dll SIM Card A 42220 2 6 Figure 32 Reference circuit of 8 pin SIM card holder The SIM PRESENCE pin is used for detection of the SIM card hot plug in User can select the 8 pin SIM card holder to implement SIM card detection function AT command AT CSDT is used to enable or disable SIM SIMS800 Hardware Design V1 05 38 2014 03 25 609 n of SIM Tech A company Smart Machine Smart Decision card detection function For details of this AT command please refer to document 1 If the SIM card detection function is not used user can keep the SIM PRESENCE pin open The reference circuit of 6 pin SIM card holder 15 illustrated in the following figure SIM Card VCC GND RST VPP CLK I O C707 10M006 512 2 MODULE 1 42220 2 6 Figure 33 Reference circuit of 6 pin SIM card holder 4 9 2 SIM Card Design Consideration SIM card circuit 15 susceptible to interference causing the SIM card failures or some other situations so it 15 strongly recomme
41. ected to SIM800 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 total impedance between battery and VBAT pins should be less than 15010 The following figure shows VBAT voltage drop at the maximum power transmit phase and the test condition is as following VBAT 4 0V VBAT bypass capacitor CA 100LF tantalum capacitor ESR 0 7Q Another VBAT bypass capacitor 1 See and in figure 5 577u8 4 4 615mS 7 5 T Burst 2A VBAT Max 350mV Figure 8 VBAT voltage drop during transmit burst 4 1 1 Power Supply Pin The 3 VBAT pins are used for power input and pin 62 63 64 65 should be connected to the power GND VRTC is power supply of the RTC circuit in the module VDD EXT will output 2 8V when module powered up When designing the power supply in user s application pay special attention to power losses Ensure that the SIMS800 Hardware Design V1 05 21 2014 03 25 Smart Machine Smart Decision input voltage never drop 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 trans
42. er Table 18 Pin description ard holder 5 800 provides PCM interface Table 19 PCM pin definition SIM 800 Hardware Design V1 05 41 2014 03 25 Smart Machine Smart Decision A company of SIM Tech SIM800 PCM interface only supports master mode data length is 16 bits linear and PCM clock rate is 256 KHz Table 20 PCM specification Syne Format Data Ordering 000 Note User can use AT command control PCM interface for deta fer to document 1 4 10 1 PCM Multiplex Function SS With GPIOI17 and GPIO19 PCM interface can be SN SPI or SD interface the following table shows the detailed multiplex function Table 21 PCM Multiplex Function 7 Note Multiplex Function need different software version SIM 800 Hardware Design V1 05 42 2014 03 25 4 10 2 PCM Interface Refer to the following figure for PCM design lt Smart Machine Smart Decision Module Figure 36 PCM reference circuit 4 10 3 LCD Display SPI Interface SIM800 provides serial interface It could be used as SPI interface inthe embedded AT application For details about embedded AT application please refer to document 1 Refer to the following figure for SPI design DISP CS DISP D C Module Figure 37 LCD reference circuit Note This function is not supported in the stand
43. er 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 engine 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 65 2014 03 25 2 Smart Machine Smart Decision A company of SIM SIMS800 Hardware Design V1 05 66 2014 03 25 lt gt 2095999 Smart Machine Smart Decision IV Safety Caution Table 56 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 15 sw
44. he 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 15 lower than normal mode 12 2014 03 25 company of SIM Tech Smart Machine Smart Decision 2 3 SIM800 Functional Diagram The following figure shows a functional diagram of SIM800 GSM baseband engine Flash GSM part Antenna interfaces Other interfaces Digital Analog Interface Interface Analog Digital UART Baseband Baseband SIM USB KEY PCM SPI SD Figure 5 800 functional diagram 8 800 Hardware Design V1 05 13 2014 03 25 3 Package Information lt o ecce Smart Machine Smart Decision 3 1 Pin Out Diagram 5 87 RF SYNC 80 STATUS 92 GND 12 GND 23 GND 192 GND 61 3 GND 128 GND 24 VBAT 1 GND 50 ANT 120 vBAT 23 VBAT 22 GND 22 NETLIGHT 123 ANT BT PWREEY 1 7 COLU GPIO 18 GND 2 73 50 COLI GPIOS DTR 3 7 48 COLZ GPIOS 4 48 COLSIGPIO7 DED 5 p 47 COLA GPIOB PCM OUT 6 GND Fhe p 45 GND RTS 8 7 SIMSO0 7 44 ROWU
45. ient lt 30 C 60 RH or as stated 1 Unlimited at lt 30 85 2 year 2a 4 weeks 3 168 hours 4 72 hours 48 hours 5 24 hours 6 Mandatory bake before use After bake it must be reflowed within time limit specified on label NOTES 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 JEDEC J STD 0355 must be followed 7 4 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 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 containers Care should be taken that the plastic tray is not heat resistant SIMS00 modules should be taken out for baking and otherwise the tray may be damaged by high temperature during baking Table 52 Baking requirements Baking temperature Moisture Time 40 5 lt 5 192 hours 120 C 5 C lt 5 4 hours 8 800 Hardware Design V1 05 62 2014 03 25 9006 8 Appendix I Related Documents Table 53 Related Documents SN 5 4 10 11 Document name SIMS00 Series AT Command Manua
46. itched 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
47. l V1 00 doc ITU T Draft recommendation V 25ter new GSM 07 07 GSM 07 10 GSM 07 05 GSM 11 14 GSM 11 11 GSM 03 38 GSM 11 10 AN Serial Port AN SIM900 TCPIP SIMS800 Hardware Design V1 05 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 Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity Module Mobile Equipment SIM ME interface Digital Phase Specification of the Subscriber Identity Module Equipment SIM ME interface cellular telecommunications system cellular telecommunications system 2 3 Mobile Digital cellular telecommunications system Phase 24 Alphabets and language specific information Mobile Part 1 Conformance Digital cellular telecommunications system Phase 2 Station MS conformance specification specification AN Serial Port TCP IP Applications User Manual 63 2014 03 25 060 company of SIM Tech Smart Machine Smart Decision II Multiplex Function Table 54 Multiplex Function Pin name Pin number M
48. le clock speed for LS FS mode operation Support 7 bit 10 bit addressing Support high speed mode Support slave clock extension START STOP REPEATED condition Manual transfer mode Multi write per transfer up to 8 data bytes for non DMA mode Multi 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 I2C I2C serial bus clock SDA 38 I2C serial bus data Note I2C has been pulled up to 2 8V via 4 7KQ Table 25 I2C multiplex function SCL GPIO24 SDA 38 SDA GPIO25 4 13 General Purpose Input Output GPIO SIM800 provides 2 GPIO pins The output voltage level of the GPIO can be set by the AT command SGPIO The input voltage level of the GPIO can also be read the AT command SGPIO For more details please refer to document 1 Table 26 Pin definition of the GPIO GPIO17 11 Pull down 19 13 Pull down 8 800 Hardware Design V1 05 47 2014 03 25 Smart Machine Smart Decision 4 14 ADC Table 27 Pin definition of the ADC Analog to Digital Converter SIM800 provides an auxiliary ADC which can be used to measure the voltage User can use AT command to read the voltage value For details of this AT command please refer to document 1 Table 28 ADC specification Voltage range ADC Resolution 10 bits
49. low from source to VBAT pin should go though Zener diode then huge capacitor PIN 62 63 64 65 are GND signals and should be designed shortest layout to GND of power source 5 2 3 SIM Card Interface SIM card holder will take much more space on board and there has no anti EMI component inside so SIM card interface always be interfered So pay attention to this interface during layout Ensure SIM card holder far way from antenna or RF cable inside And it s better to put SIM card holder near module And it s better to add ESD component to protect clock data reset and VSIM signals which should be far away from power and high speed signal SIM800_Hardware Design V1 05 54 2014 03 25 5 2 4 Audio Interface gt Cheecee Smart Machine Smart Decision In order to avoid TDD noise or current noise or some other noise the signal trace of audio should far away from antenna and power and it is recommended to surround audio traces by ground And do not rout audio trace and VBAT trace parallel 5 2 5 Others It s better to trace signal lines of UART bunched as well as signals of USB and LCM SIMS800 Hardware Design V1 05 55 2014 03 25 6 Electrical Reliability and Radio Characteristics lt lt lt Smart Machine Smart Decision 6 1 Absolute Maximum Ratings The absolute maximum ratings stated in following table ar
50. mit burst The power IC and the bypass capacitor should be placed to the module as close as possible VBAT MIN 3 0V Figure 9 The minimal VBAT voltage requirement at VBAT drop 4 1 2 Monitoring Power Supply The AT command can be used to monitor the VBAT voltage For details please refer to document 1 4 2 Power on down SIM800 4 2 1 Power 5 800 User can power on SIM800 by pulling down the PWRKEY pin at least 1 second and then release This pin is already pulled up to VBAT in the module internal so external pull up is not necessary Reference circuit is shown as below VBAT 100 PWRKEY Power on down logic 1K Module Figure 10 Power on down module using transistor 8 800 Hardware Design V1 05 22 2014 03 25 e A company om Tech gt lt Smart Machine Smart Decision VBAT 100K PWRKEY Power on down 1K logic Module Figure 11 Power on down module using button The power timing is illustrated as following figure lt lt 3 45 Tull down gt 15 1 lt 1 7 PWRKEY VDDEXT STATUS v jill Serial port Undefined Active Figure 12 Timing of power on module When power on procedure is completed SIM800 will send following URC to indicate that the module is ready to operate at fixed baud rate
51. nce circuit Note Do not change the 20KQ resistor in the diagram Customer should add a resistor to enhance the ESD performance and the value of resistor should be less than the connection diagram is shown in figure 41 as an example Module Figure 41 Enhance the ESD performance of keypad circuit Module can detect two buttons pressed synchronously at both the traditional and extended keypad connection but customer should notice that do not assign keys which will be pressed at the same time on same COL and ROW when implement the extended keypad design The following figure 15 an example to explain this situation CTRL and can not be recognized if the two buttons were pressed at the same time 8 800 Hardware Design V1 05 45 2014 03 25 Smart Machine Sma Module rt Decision Figure 42 Keypad detected 9 Table 22 Pin definition of keypad interface A Table 23 Keypad multi unction e 7 3 S 3 gt S A a CX S 5 x S 2 5 SIM800_ Hardware Design_V1 05 ON 2014 03 25 4 12 2C BUS Smart Machine Smart Decision The SIM800 provides an I2C interface it can be driven by either the master or slave and conform to the I2C specification It has the following features Compliant master mode operation Adjustab
52. nded to follow these guidelines while designing Make sure that SIM card holder should faraway from GSM antenna while in PCB layout SIM traces should keep away from RE Tines VBAT and high speed signal lines The traces should be as short as possible Keep SIM holder s GND connect to main ground directly Shielding the SIM card signal by ground well Recommended to place capacitor on VSIM line and keep close to the holder Add some TVS andthe parasitic capacitance should not exceed 50pF and 220 resistor in serials SIM signal could enhance ESD protection 4 9 3 Design Considerations for SIM Card Holder For 8 pins SIM card holder SIMCom recommends to use Molex 91228 User can visit http www molex com for more information about the holder 8 800 Hardware Design V1 05 39 2014 03 25 Smart Machine Smart Decision LALA c 1 1E qmm 3 0 REF FULL STROKE 2 0 3 0 47 7 NOTE 3 9228 0001 SDA 9 228 PRAT 2 54 PITCH cU i 0 4 REF HsG EDGE RECOMMENDED LAYOUT 2 1 TES PRODUCT SPECIFICATION PS 99020 007 1 2 PACKING TAPE AND REEL DETAIL SEE 504 91228 9001 3 PUSH ROG YLEVER MUST NOT PROTRUDE BEYOND HOUSING EDGE IM THIS AREA 4 TAILS OM EACH SIDE OF CONNECTOR LIE WITHIN G l2mm EACH OTHER 314 00 0 15 COMPONENT OTY HOUSING LIQUID CRYSTAL POLYMER LCP 304 GLASS FILL 94 0 COLOUR BLACK TERM
53. ns of sleep mode are enabling and there is no on air and no hardware interrupt such as GPIO interrupt or data on serial port In this case the current consumption of module will reduce to the minimal level In sleep mode the module can still receive paging message and SMS Software is active Module registered to the GSM network and the module is ready to communicate Connection between two subscribers is in progress In this case the power consumption depends on network settings such as DTX FR EFR HR hopping sequences antenna Module is ready for GPRS data transfer but no data is currently sent or received In this case power consumption depends on network settings and GPRS configuration There is GPRS data transfer PPP or TCP or UDP in progress In this case power consumption is related with network settings e g power control level uplink downlink data rates and GPRS configuration e g used multi slot settings Normal power down 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 without removing the power supply In this mode the RF part of t
54. ode 0 default Mode 1 Mode 2 Mode 3 UART DTR 3 UART DTR GPIO13 EINT2 UART RI 4 UART RI GPIO14 UART DCD 5 UART DCD GPIOI5 PCM OUT 6 GPIO16 MC3DA3 GPIO16 17 11 GPIO17 DISP CLK MC3DAI GPIO17 PCM_IN 12 PCM_IN DISP DATA MC3DA2 18 19 13 GPIO19 DISP D C 0 19 14 DISP CS MC3CK GPIO20 SIM PRE 34 SIM PRE GPIO21 EINT7 35 GPIO22 EINTO PWM2 36 GPIO23 PWM2 EINT8 SDA 5 SDA GPIO24 SCL 38 SCL GPIO25 ROWA 40 ROWA GPIOI EINT3 ROW3 4 ROW3 GPIO2 ROW2 42 ROW2 GPIO3 43 4 44 GPIOS COL4 47 COL4 GPIO6 EINT1 COL3 48 COL3 GPIO7 COL2 49 COL2 GPIO8 COLI 50 COLI GPIO9 COLO Sl COLO 10 SYNC 67 SYNC GPIOI1 PCM CLK 68 PCM CLK GPIO12 GPIO12 SIM800 Hardware Design V1 05 64 2014 03 25 e A compal om Tech 3 Smart Machine Smart Decision III 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 SIMS800 Hardware Design V1 05 Description Analog to Digital Converter Adaptive Multi Rate Bluetooth Coding Scheme Circuit Switched Data Clear to Send Data Terminal Equipment typically comput
55. of SIM Tech A company Smart Machine Smart Decision 4 3 Power Saving Mode SIM800 has two power saving modes Minimum function mode and sleep mode The AT command AT CSCLK 1I can be used to set SIM800 into sleep mode The AT command AT CFUN lt fun gt can be used to set SIM800 into minimum function When SIM800 is in sleep mode and minimum function mode the current of module 15 the lowest 4 3 1 Function Mode There are three function modes which could be set by the AT command lt gt The command provides the choice of the function levels lt fun gt 0 1 4 AT CFUN 0 Minimum function AT CFUN I Full function default AT CFUN 4 Flight mode disable RF function Table 7 The current consumption of function modes BS PA MFRMS 5 Fun Current consumption uA CSCLK 1 0 790 71 1 1307 4 833 25 Minimum function mode minimizes current consumption to lowest level If SIM800 is set to minimum functionality by AT CFUN O the RF function and SIM card function will be disabled In this case the serial port 15 still accessible but all AT commands correlative with RF function and SIM card function will not be accessible For detailed information about the AT Command AT CFUN lt fun gt please refer to document 1 4 3 2 Sleep Mode AT CSCLK 1 User can control SIM800 module to enter or exit the sleep mode AT CSCLK 1 by DTR signal When is in high
56. ower source SIMS800 Hardware Design V1 05 32 2014 03 25 ee o 2 lt Smart Machine Smart Decision 4 5 4 Software Upgrade and Debug USB and UART interfaces can be used for firmware upgrade If customer upgrading firmware via the USB port SIM800 must be powered first then connect VBUS USB DP USB DM and GND to PC There is no need to operate PWRKEY pin in the whole procedure when SIM800 detects VBUS and could communicate normally by USB DP and USB DM module will enter USB download mode automatically Note When only USB DP and USB DM connected no VBUS customer need to pull down COLO before power on the module then press the PWRKEY button the module will enter download mode If customer upgrading firmware via UART port it is strongly recommended reserve the UART TXD UART RXD GND and PWRKEY pins to IO connector for the upgrade and PWRKEY pin should connect to GND while upgrading Refer to the following figure for upgrading software MODULE DCB Connector Serial port TXD AS TXD RXD RXD GND 0 0 GND PWRKEY o PWRKEY Figure 25 Connection for software upgrading The serial port supports the CMOS level If user connects the module to the computer the level shifter should be added between the DCE and DTE 4 5 5 Multiplex Function of Serial
57. sampling rate 1 0833 MHz ADC precision 10 20 mV Note the voltage should less than 2 8V or the ADC may be damaged 4 15 PWM Table 29 Pin definition of the PWM PWMI GPIO22 35 PWMI multiplex with GPIO22 PWMO2 GPIO23 36 PWM2 multiplex with GPIO23 Note SIM800 can only support 1 PWM synchronously if customer set PIN 35 as PWM so PIN36 can only be used as GPIO output frequency varies from 0 to 2KHz Two 7 bit unsigned binary parameters are used for the output period and for duty cycle The AT command AT SPWM is used to set the output period and duty cycle of the PWM For details please refer to document 1 A typical circuit of the PWM drives buzzer 15 shown in the following figure 8 800 Hardware Design V1 05 48 2014 03 25 gt o 3 521 3 lt 2 09999 5 2066 8 Smart Machine Smart Decision VBAT Module Figure 43 Reference circuit of PWM drive buzzer Table 30 Buzzer output characteristics Working voltage Working current 16 mA Note PWM pin must keep low when module in the boot process Table 31 PWM multiplex function PWMI GPIO22 35 PWMI GPIO22 PWM2 GPIO23 36 GPIO23 PWM2 4 16 Network Status Indication Table 32 Pin definition of the NETLIGHT NETLIGHT Network Status Indication The NETLIGHT pin can be used to drive a network status indication LED The status of this pin 15 listed in following table Tabl
58. 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 8 800 Hardware Design V1 05 67 2014 03 25 0609 Bi reir pee Smart Machine Smart Decision Contact us Shanghai SIMCom Wireless Solutions Ltd Add SIM Technology Building No 633 Jinzhong Road Changning District Shanghai P R China 200335 Tel 86 21 3235 3300 Fax 86 21 3235 3301 URL www sim com wm SIM800 Hardware Design V1 05 68 2014 03 25
59. teristic Table 14 Microphone input characteristics Parameter Min Typ Max Unit Mic biasing voltage 1 9 p V Working Current 2 mA Input impedance differential 13 20 27 Idle channel noise 67 dBm Input level 40dBm0 29 dB SINAD Input level 0dBmO0 69 dB Table 15 Audio output characteristics parameter Conditions Min Typ Max Unit Normal output 32 Q receiver 90 mW 4 7 4 TDD GSM signal could interfere audio by coupling or conducting Coupling noise could be filtered by adding 33 pF and 10 capacitor over audio lines 33pF capacitor could eliminate noise from GSM900MHZz while capacitor could eliminate noise from DCS1800MHz frequency Coupling noise has great relatives with PCB layout Under some scenarios TDD noise from GSM 900MHz frequency affects heavily but some different story is from GSM1800MHz fervency so customer should develop this filter solution according to field test result GSM antenna 1s the key coupling interfering source of TDD noise Pay attention to the layout of audio lines which should be far away from RF cable amp antenna and VBAT pin The bypass capacitor for filtering should be placed near module nd another group placed near to connector Conducting noise 15 mainly caused by the VBAT drop If Audio PA was powered by VBAT directly then there will be some cheep noise from SPK output easily So it s better to put big capacitor and ferrite bead near audio PA input TDD noise has
60. uit of the VBAT input Table 5 Recommended Zener diode Vendor Part number Power watts Package 1 On semi MMSZ5231BT1G 500m SOD123 p cj elec MMSZ5231B 500mW SOD123 3 Prisemi PZ3DAV2H 500mW SOD323 4 Prisemi PZ5DAV2H 500mW 500523 5 Vishay MMSZA689 V 500mW SOD123 6 Crownpo CDZ55C5VISM 500mW 0805 The following figure is reference design of 5V input power supply The designed output for power supply is 4 1V thus a linear regulator can be used DC INPUT U101 MIC29302 VBAT C101 C102 100uF Figure 6 Reference circuit of power supply 8 800 Hardware Design V1 05 20 2014 03 25 m 7 Smart Machine Smart Decision A company If there 1s 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 FB101 is very important customer can get better EMI feature with appropriate filtering bead Dos 0101 LM2596 ADJ L101 FB101 ABAT FUSE ta Vout 5 100uH 270 OHM ON a cio ce FB 4 0102 C103 104 d 1 19 5 330uF 100nF MBR360 R102 Figure 7 Reference circuit of the DC DC power supply The single 3 7V Li ion cell battery can be conn
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