SIM800_Hardware Design_V1.08
Contents
1. 57 6 10 Radio CIARA RCTS o 57 Sensitivity m 58 6 12 Moue 58 74 Nanai 59 Tl poo and Bottom View or SIMQSUD gestes tidal os cetus usse 59 1225 IO pical Relow 59 7 2 The Moisture Sensitivity Level 60 7 4 Baking 5 2 62 hu 60 8 NOUIS NETTE T UU T UU 61 I Related Documents NEED Tem 61 II TUE EO 02259225 025982 3012 2 2502266223025 6006 504625 GO Uses Uv duas UE Ene E dum Rd LUC USE 62 III Terms and Abbreviations 63 IV E NR 65 8 800 Hardware Design V1 08 4 2015 03 05 A compan lt O Smart Machine Smart Decision Table Index 5INSUUKEY EBATUBRISS 10 TABLE 2 CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE2. acera uestis me a uen RH men RE REO e ETE 38 493 Design Considerations for SIM Card 4 39 LP IUE RE 40 Z IL POM Multiples UNCC euo 41 2 D1 b gt 4 4 10 3 LCD Display SPI 42 ALT E 42 8 800 Hardware Design V1 08 3 2015 03 05 ee 6 09 company of SIM Tech Smart Machine Smart Decision 411 Keypad Interface 42 LOBU 45 4 15 General Purpo e Input Output OP IQ 46 46 A E 47 4 19 Network Status 48 4T7 Operating Statis Tm 48 49 4 19 Synchronization 49 4 20 Antenna TET ACG NOR CRM RH 50 ADO ere IVE Pe Ne TRECE 50 4202 Bluetooth Antenna Interlace cere acera 51 5 FOB LAOU eA 52 5 1 PIN AS wr cn 52 5 2 PC L
3. 221111 2 nennen nnn ansa nennen eee 43 FIGURE 40 EXTENDED KEY PAD REFERENCE CIRCUIT sas cspaspevesecstuscuseesiuesc usus Uu Pes Bes en DUC rS eus pM etas 43 FIGURE 41 ENHANCE THE ESD PERFORMANCE OF KEYPAD 2 44 Wo Cis D eee een ere ie ee _ _____ 6 _ _____ __ __ 44 PICU AS OPIO TIMING SOE __ _____ 46 FIGURE 44 REFERENCE CIRCUIT OF PWM DRIVE BUZZER Cos 47 FIGURE 45 REFERENCE CIRCUITOF NETLIGH dria tis ipt es 48 FIGURE 46 KPEED DRIVER REFERENCE CIRCUIT Ones Fan than bona 49 SIMS800 Hardware Design V1 08 2015 03 05 ee 6 09 of SIM Tech company Smart Machine Smart Decision FIGURE 47 RF SYNC SIGNAL DURING TRANSMIT FIGURE 48 GSM ANTENNA MATCHING CIRCUIT FIGURE 49 GSM SIMPLE ANTENNA MATCHING CIRCUIT 222222 2 24 2420 4440 44 2 0000066 FIGURE 50 BLUETOOTH ANTENNA MATCHING CIRCUIT 1 21 1 02 01 444 44
4. compan om e ies Smart Machine Smart Decision lt 2 The pin 15 changed to low When any of the following events occur the pin will be changed to high Data call 1 Establish the call 2 Hang up the call SMS The pin is changed to low and kept low for 120ms when a SMS is received Then it is changed to high TRE The pin is changed to low and kept low for 120ms when some URC s are reported Then it is changed to high For more details please refer to document 10 The behavior of the RI pin 1s shown in the following figure when the module is used as a receiver RI HIGH Establish the call Hang up the call LOW Idle Ring Figure 26 RI behaviour of voice calling as a receiver RI HIGH Establish the call Hang up the call LOW Idle Ring Figure 27 RI behaviour of data calling as a receiver Idle Receive SMS 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 SIM800 Hardware Design V1 08 34 2015 03 05 m E lt 2009999 5 5 8 Smart Machine Smart Decision HIGH Idle Ring Establish Hang up Idle 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
5. Los emus asta ba 20 FIGURE 7 REFERENCE CIRCUIT OF THE DC DC POWER 21 FIGURE 8 VBAT VOLTAGE DROP DURING TRANSMIT 5 21 FIGURE 9 THE MINIMAL VBAT VOLTAGE REQUIREMENT AT VBAT 00 22 FIGURE 10 POWER ON OFF MODULE USING 24 FIGURE 11 POWER ON OFF MODULE USING BUTTON ge ee eee qe M e 22 FIGURE 12 TIMING OF POWER ON MODULE 23 FIGURE 13 TIMING OF POWER OFF 5 8 656 24 FIGURE 25 FIGURE TS RESET TIMING SEQUENCE __ __ 6_________ 26 FIGURE 16 RTC SUPPLY FROM CAPA CTI OR eii eetse tisse vasta sees odorato 27 FIGURE 17 RTC SUPPLY FROM NON CHARGEABLE BATTERY 4 28 FIGURE 18 RTC SUPPLY FROM RECHARGEABLE BATTERY 07 28 FIGURE T9 CONNECTION OF THE SERDAE PORT E 30 FIGURE 20 LEVEL CONVERTING BY RESISTOR Am 30 FIGURE 2E ISOLATION CIRCUIT BY DIODES nesramno io ee rentre reo reca rar tat exo bra perma 30 FIGURE 22 TX LEVEL CONVERTING BY nnn nnne nne neenon 21 FIGURE 23 RX LEVEL CONVERTING BY T
6. 48 TABLE 35 54 WD IHE NEILIGHT 48 TABLE 34 PIN DEVINITION OF THE 9 ATUS kr enn nen 48 DEFINITION OF THE 49 T 49 TABLE 37 DEFINITION THE RF SYNC Rose 49 TABLE 39 RECOMMENDED OPERATING 85 enne nennen 54 TABLE 40 DIGITAL INTERFACE CHARACTERISTICS 54 TABLE 41 SIM CARD INTERFACE 55 TABLE A SIM WDDCHATRACTBRDESTIGS 55 TABLE 43 VDD EXT CHARACTERISTICS too Mie enit 55 TABLE 44 VRIO CHARACTERISTIC 55 TABLE 45 gt CURRENT CONSUMPTION ____ ___ __ 56 TABLE 46 THE ESD CHARACTERISTICS TEMPERATURE 25 C HUMIDITY 45 57 TABLE 47 GSM 900 AND GSM 850 CONDUCTED RF OUTPUT nnne 57 8 800 Hardware Design V1 08 2 2015 03 05 ee 6 09 of SIM Tech company TABLE 48 TABLE 49 TABLE 50 TABLE 51 TABLE 52 TABLE 53 TABLE 54 TABLE 55 TAB
7. 39 TABLE 18 PIN DESCRIPTION AMPHENOL SIM CARD HOLDER 40 E e 40 TABLE 20 Nt 4 TABLE 21 PCM MULTIPLEX BING oe canis Se 4 TABLE 22 PIN DEFINITION OF THE KEYPAD 44 TABLE 23 KEYPAD MULTIPLEX FUNG ION sone e 45 TABLE 24 PIN DEFINITION OP THE I2C e 45 TABLE 253 ZLO MULTIPLEX FUNCION Noc tue meses _ ___ _____ 45 TABLE 26 PIN DEFINITION OF THE GPION Nette teorie th enhn ee Pos 46 TABLE 27 PIN DEFINITION THE ANQ Ue etie ci cuc tiec ieget _ ________ ____4 _ _ __ 46 TABLE 285 ADC SPECIFICATION 46 TABLE 29 PIN DEFINITIONWEF THE PWM 47 TABLE 30 PWM 5 47 TABLE 31 PWM ALBIS NOT ____ ___ _ 46 _ 47 TABLE 32 PIN DRNNITION OF THE NETLIGHT
8. 4700 330uF 100nF R102 43K Figure 6 Reference circuit of the power supply SIM800_Hardware Design V1 08 20 2015 03 05 ee eec 8 11 e Smart Machine Smart Decision 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 1 yin Vout 2 C101 C102 5 OWOf zz Fg p102 ii 100uF T iE 2 2K PWR_CTRL 3 330uF MBR360 R102 mE C Figure 7 Reference circuit of the DC DC power supply The single 3 7V Li ion cell battery can be connected 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 1500 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
9. 5 5 8 Smart Machine Smart Decision Contents 1 OC OR 10 2 I 10 216 eI VENIS TS A RTT 10 2 2 MOS 12 2 3 5 800 Functional Diagram 0000002 00 00 000 000000000000 nnn nnn nnn 13 3 MILITE D T UU T UU 14 3 D i NOR T hee ase os 14 3 2 Din Deser PUM M cun SE 15 Package Dimensions A 18 4 T n 20 4 Power A aeneae 20 Power Suppi RR e 21 AT Power OUDDD posce aere 22 4 2 c 22 42l Poweron SIMS00 rS 22 dle o aro OU VE NEP n 23 QUITO RR Gace TN AE 25 4 3 Power aliqu tuU ean T 26 4 3 1 Function pe re Nee 26 4 3 2 Sleep Mode AT CSCL
10. Com A company of SIM Tech SIM800 Hardware Design V1 08 E ecce 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 syst m 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 15 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 d sign specification supplied herein are subject to change without notice at any time Copyright Shanghai SIMCom Wireless Solutions Ltd 2015 8 800 Hardware Design V1 08 2 2015 03 05 m E lt 2009999
11. ee 009 09 company of SIM Tech II Multiplex Function Table 54 Multiplex Function Pin name DTR RI DCD PCM OUT GPIO17 PCM IN GPIO19 PCM SYNC SIM DET PWMO PWMI SDA SCL KBR4 KBR3 KBR2 KBRI KBRO KBC4 KBC3 KBC2 KBCO RF SYNC PCM CLK SIMS800 Hardware Design V1 08 Reset status I PD I PD I PD I PD I PD I PD I PD I PD I PD I PD I PD I PD I PD I PD I PD I PD I PD LO I PD I PD I PD I PD I PU I PD I PD Pin number 3 4 5 6 11 12 13 14 34 35 30 37 38 40 41 42 43 44 47 48 49 50 51 67 68 Mode O default DTR RI DCD PCM OUT GPIO17 PCM IN GPIO19 PCM SYNC SIM DET PWMO GPIO23 SDA SCL KBR4 KBR3 KBR2 KBRI KBRO KBCO KBC2 KBC3 KBC4 RF SYNC PCM CLK 62 Mode 1 GPIO13 GPIO14 GPIO15 GPIO16 DISP_CLK DISP DATA DISP D C DISP CS GPIO21 GPIO22 PWMI GPIO24 GPIO25 GPIO1 GPIO2 GPIO3 GPIO4 GPIOS GPIOG GPIO7 GPIOS GPIO9 GPIO10 GPIO11 GPIO12 Smart Machine Smart Decision Mode 2 EINT2 SD DATA3 SD 1 SD DATA2 SD DATAO SD CLK EINT7 EINTO EINT8 SD CMD Mode 3 GPIOI6 GPIOI7 GPIOIS 19 GPIO20 12 2015 03 05 ee 009 09 A company of SIM Tech III Terms and Abbreviations Smart Machine Smart Decision Table 55 Terms and Abbreviations Abbreviation Description ADC Analog to Digital Converter AMR Adaptive Multi Rate BT Bluet
12. TABLE 3 OVERVIEW OF OPERATING 12 TABLE Sg EP eI cr 15 TABLE 5 RECOMMENDED ZENER DIODE tes ria eie ten essa ente 20 TABLE 6 ELECTRONIC CHARACTERISTIC OF THE 40 0 02422 4000 00 00000 00 26 TABLE 7 THE CURRENT CONSUMPTION OF FUNCTION MODES 5 5 26 TABLE 8 SERIAL PORT AND USB PIN 28 TABLE 9 SERIAL PORT CHARACTERISICS 29 TABLE 10 USB OPERATION VOLTAGE 32 TABLE 11 MULTIPLEX FUNCTION OF SERIAL eee Tee 33 TABLE 1A T 33 TABLE 13 AUDIO INTERFACE DEFINITION Mpe Desse enean edu ket toten 35 TABLE 14 MICROPHONE INPUT 58 0 36 TABLE 15 AUDIO OUTPUT CHARACTERISTICS coe cae ette eas 36 TABLE 16 SIM PIN DEFINITION so ttenesusszetekus osstebo gaudeo Y ht reo sore 37 TABLE 17 PIN DESCRIPTION MOLEX SIM CARD
13. Tech lt z Smart Machine Smart Decision 4 Application Interface 4 1 Power Supply The power supply range of SIMSOO 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 For the VBAT input a 100uF Tantalum capacitor CA low ESR and a luF 10uF Ceramics capacitor CB are strongly recommended The 33pF and 10 capacitors can effectively eliminate the high frequency interference A 5 1V 500mW Zener diode is strongly recommended 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 5 1V Figure 5 Reference circuit of the VBAT input Table 5 Recommended Zener diode Vendor Part number Power watts Packages 1 On semi MMSZ5231BT1G 500m SOD123 2 Prisemi PZ3DAV2H 500mW SOD323 3 Vishay MMSZA689 V 500mW SODI23 4 Crownpo CDZ55C5VISM 500mW 0805 The following figure is the reference design of 5V input power supply The designed output for the power supply is 4 1V thus a linear regulator can be used DC INPUT U101 MIC29302 Vout C102 C gt onor 8 R101 p ul 100K F C103 C104 R103 100uF 71
14. 10 11 12 13 14 Document name SIM800 Series AT Command Manual ITU T Draft new recommendation V 25ter 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 Module secondary SMT UGD AN SMT Module RF Reference Design Guide SIM800 EVB kit User Guide SIMS800 Hardware Design V1 08 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 system Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity Module Mobile Equipment SIM ME interface Digital telecommunications Specification of the Subscriber Identity Module Mobile Equipment SIM ME interface cellular telecommunications cellular system Phase Digital cellular telecommunications system Phase 2 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 61 2015 03 05
15. company of SIM Tech 4 13 General Purpose Input Output GPIO Smart Machine Smart Decision SIM800 provides 2 GPIO pins The output voltage level of the GPIO can be set by the AT command AT SGPIO or AT CGPIO The input voltage level of the GPIO can also be read by the AT command SGPIO or AT CGPIO For more details please refer to document 1 NOTE If you use AT SGPIO gt According to the following mapping GPIOI7 lt GPIO gt 3 GPIOI9 lt GPIO gt 2 The Pin number table in the AT CGPIO command under lt pin gt reference Table 26 Pin definition of the GPIO 17 GPIO19 13 5 PWRKEY INPUT t 1 9s gt GPIO17 lt 1045 GPIO19 Figure 43 GPIO timing sequences 4 14 ADC Table 27 Pin definition of the ADC ADC Analog to Digital Converter SIM800 provides an auxiliary ADC which can be used to measure the voltage Customerr 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 sampling rate 1 0833 MHz ADC precision 10 30 mV 8 800 Hardware Design V1 08 46 2015 03 05 Qoe 0696 009 company of SIM Tech Note the voltage should less than 2 8V or the ADC may be damaged Smart Machine Smart Decision 4 15 PWM Table 29 P
16. e Smart Machine Smart Decision 4 10 3 LCD Display SPI Interface SIM800 provides a serial interface It could be used as SPI interface the 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 RST DISP Module Figure 37 LCD reference circuit Note This function is not supported in the standard firmware If user wants this function the firmware must be customized Please contact SIMCom for more details 4 10 4 SD Card Interface Module Figure 38 SD reference circuit If the VDD of SD card is 2 8V user can use VDD EXT power the SD card directly If the VDD 15 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 SIMS800 Hardware Design V1 08 42 2015 03 05 Bi Smart Machine Smart Decision KBCOO KBC1O KBC2O 1 KBC3O KBCAO 1 KBROO Module Oo KBR1O KBR2O KBR3O 9 KBRAO o Figure 39 Traditional keypad reference circuit Note According to the traditional 5 5 keypad matrix when there are unused or KBRs user can execute AT command to define unused KBCs and KBRs as G
17. 17 2015 03 05 Smart Machine Smart Decision A compan 3 3 Package Dimensions 2 2009999 SEE DETAL 0 45 0 10 0 602012 ps E C l TH 24 SOLDER MASK 0 28 SOLDER MASK 0 28 0 72 0 08 0 7220 08 T DETAL DETAL B SCALE 51 SCALE 51 Figure 3 Dimensions of SIM800 Unit mm 8 800 Hardware Design V1 08 18 2015 03 05 8 3 E m E lt ecce 5 5 8 Smart Machine Smart Decision 2500 24 00 9 40 x _500 _ 4 00 00 3 80 4 00 ET 4H ATE 4 00 Bi p EIRIKIRIRIRIR I 5 First pad c Fh 230 Keep out Area Keep out Area 11 P Ek s k EU C c c c 2 a b P x e Wa mT PD Fol Fol Fol Fos Pod Poe Puc Dus Pod Foal Fol Poa For Pos Pos 1 IM800 Area 0 80 0 80 Mein 0 60 100 PITCH 4 00 Keep out Area Figure 4 Recommended PCB footprint outline Unit mm Note Keep copper out of area 8 800 Hardware Design V1 08 19 2015 03 05 compan
18. 2015 03 05 A compan 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 2 timeslot 4 timeslot 9 05kbps 18 1 kbps 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 SIM800 Table 3 Overview of operating modes Mode Normal operation Power off Minimum functionality mode Function Module will automatically go into sleep mode if the conditions of sleep mode are enabling and there is no on air and no hardware interrupt such GSM GPRS as GPIO interrupt or data on serial port SLEEP In this case the current consumption of module will reduce to the minimal level In sleep mode the module can still receive paging message and SMS GSM Software is active Module registered to the GSM network and the IDLE module is ready to communicate Connection between two subscribers is in progress In this case the power SALE consumption depends on network settings such as DTX FR EFR HR hopping sequences antenna CDRS Module is ready for GPRS data transfer but no data 15 currently sent or received In this case power consumption depends on network settings STANDBY and GPRS configuration There is GPRS data transfer PPP or TCP or UDP in progress In
19. ADC USB KEY PCM SPI SD Figure 5 800 functional diagram SIMS800 Hardware Design V1 08 13 2015 03 05 A compan lt Qeeee 3 Package Information 3 1 Pin Out Diagram 68 PCM PWRKEY GND DTR RI DCD PCM OUT CTS RTS TXD RXD GPIO17 PCM IN GPIO19 PCM SYNC VDD EXT RESET GND 4 ma E23 Lad jb 7 Lg M 1 E um LI 4 Ll SIMS800 Hardware Design V1 08 SIMS00 View El zt 4 t gt el e cd c cd c e SSEESSSPBESSE lt io gt tO gt 28 5 5 Figure 2 SIMS 00 pin out diagram Top view 14 Smart Machine Smart Decision lt z 5 Uu CO CO CO CO CO CO CO CO FEE KECO KBC1 KBC2 KBC3 KBC4 GND GND KBRO 3 KBR2 41 KBR3 KBR4 39 GND SCL 37 SDA PWM1 PWMD Le 2015 03 05 Qoe 06096 of SIM Tech pem Smart Machine Smart Decision 3 2 Pin Description Table 4 Pin description SIM 800 Hardware Design V1 08 2015 03 05 BE g 3 Smart Machine Smart Decision SIM800 Hardware Design V1 08 16 2015 03 05 Smart Machine Smart Decision SIM 800 Hardware Design V1 08
20. BUTTON GF NYLON 46 YELLOW B gt COIL SPRING rt Ye 0 25 STAINLESS STEEL 0 4 STAINLESS STEEL STEEL 0 4 STAINLESS STEEL 10401410151 RESCUE ER MERA ANGLE PROJECTION ISE ONLY ON CAD SYSTEM REV e P L BLL NET NE la 2 CONT HEIGHT SIM PCB CONNECTOR DATE 0 0409 0 3 X ROG MOLEX EUROPE 96 09 16 um as DM NL i NEHME 3 D 9 IzzB eme 26 0 REF 31 00 COMPONENT Figure 34 Molex 91228 SIM card holder Table 17 Pin description Molex SIM card holder Pin name Signal Description Cl SIM VDD SIM card power supply SIM RST SIM card reset C3 SIM CLK SIM card clock C4 GND Connect to GND GND Connect to GND C6 Not connect C7 SIM DATA SIM card data I O 8 SIM DET Detect SIM card presence For 6 pin SIM card holder SIMCom recommends to use Amphenol C707 10 006 512 User can visit http www amphenol com for more information about the holder SIMS800 Hardware Design V1 08 39 2015 03 05 Smart Machine Smart Decision Si CARD GSM 11 11 4 CARD INPUT SIM card holder Figure 35 Amphenol C Table 18 Pin description Amphenol SIM ld 7 4 10 erface 5 800 provides PCM interface Table 19 PCM pin definition SIM 800
21. Hardware Design V1 08 40 2015 03 05 ee 6 09 of SIM Tech company Smart Machine Smart Decision SIM800 PCM interface only supports master mode data length is 16 bits linear and PCM clock rate is 256 KHz Table 20 PCM Specification Feature Specification Line Interface Format Linear Fixed Data length 1 6bits Fixed PCM Clock Sync Source Master Mode Fixed PCM Clock Rate 256Khz Fixed PCM Sync Format Short sync Long sync both support Zero Padding Sign extension Default Zero Padding Data Ordering MSB LSB both support Note User can use AT command control PCM interface for details please refer to document 1 4 10 1 PCM Multiplex Function With GPIO17 and GPIOI9 PCM interface can be configured as SPLor SD interface the following table shows the detailed multiplex function Table 21 PCM Multiplex Function Name number Mode 0 default Mode 1 Mode 2 Mode 3 PCM OUT 6 PCM OUT 16 SD DATA3 GPIO16 PCM_IN 12 PCM_IN DISP DATA SD DATA2 PCM SYNC 14 DISP CS SD CLK GPIO20 PCM CLK 68 PCM CLK GPIO12 SD CMD GPIO12 GPIO17 11 GPIO17 DISP CLK SD DATA GPIOI7 19 13 GPIO19 DISP D C SD DATAO GPIO19 Note Multiplex Function need different software version 4 10 2 PCM Interface Refer to th following figure for PCM design Module Figure 36 PCM reference circuit 8 800 Hardware Design V1 08 41 2015 03 05 ee eec 8 11
22. Power off SIM800 by AT Command 5 800 can be powered down by AT command AT CPOWD 1I This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut down Before the completion of the power off procedure the module will send URC NORMAL POWER DOWN At this moment AT commands not be executed any more and only the is still active Power off mode can also be indicated by STATUS pin which 15 at low level at this time For details about command please refer to document 1 4 2 2 3 Over voltage or Under voltage Power off The module software monitors the VBAT voltage constantly If the voltage lt 3 49V the following will be reported UNDER VOLTAGE WARNNING If the voltage gt 4 3V the following will be reported OVER VOLTAGE WARNNING If the voltage 3 39V the following URC will be reported and the module will be automatically powered off UNDER VOLTAGE POWER DOWN If the voltage gt 4 4V the following will be reported and the module will be automatically powered off OVER VOLTAGE POWER DOWN 8 800 Hardware Design V1 08 24 2015 03 05 ee 6 09 A company of SIM Tech At this moment AT commands can not be executed any more and only the RTC is still active Power off mode Smart Machine Smart Decision can also be indicated by STATUS pin which 15
23. SMFO5C The SIM peripheral circuit should be close to the SIM card socket reference circuit of the 8 pin SIM card holder is illustrated in the following figure SIMS800 Hardware Design V1 08 37 2015 03 05 Smart Machine Smart Decision VDD EXT pg MOLEX 91228 GND SMe _ 210 RST VPP Module S 510 CLK es PRESENCE GND DATA 510 SIM 22pF SMFO5C 1 Figure 32 Reference circuit of the 8 pin SIM card holder The SIM DET pin is used for detection of the SIM card hot plug in User can select the 8 pin SIM card holder to implement SIM card detection function AT command AT CSDT is used to enable or disable SIM card detection function For details of this AT command please refer to document 1 If the SIM card detection function is not used user can keep the SIM DET pimopen The reference circuit of 6 pin SIM card holder 15 illustrated the following figure 4 9 2 SIM Card VCC GND 4 RST VPP CLK C707 10M 006 512 2 Module 5 S D Figure 33 Reference circuit of the 6 pin SIM card holder Card Design Consideration SIM card circuit is susceptible to interference causing the SIM card failures or some other situations so it 15 strongly recommended to follow these guidelines while designing Ma
24. analog output The output can directly drive 320 receiver Table 13 Audio interface definition Pin name Pin number Function MICP 19 Audio input positive MICN 20 Audio input negative Audio channel SPKP 21 Audio output positive SPKN 22 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 4 7 1 Speaker Interfaces Configuration C bse to speaker ESD 10pF__ 33pF ES E 33pF ESD Figure 30 Speaker reference circuit 8 800 Hardware Design V1 08 35 2015 03 05 compan lt CQheeee Smart Machine Smart Decision 4 7 2 Microphone Interfaces Configuration components should be placed to microphone as close as possible The lines in bold type should be accorded to differential 10pF 33pF signal layout rules Electret Microphone Figure 31 Microphone reference circuit 4 7 3 Audio Electronic Characteristic Table 14 Microp
25. connection between module and client DTE Table 8 Serial port and USB pin definition Name Pin number DTR 3 RI 4 DCD 5 Serial Port CTS 7 RTS 8 TXD 9 RXD 10 USB VBUS 24 USB Interface USB DP 21 USB DN 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 negative Note Hardware flow control is disabled by default The AT command 2 2 can enable hardware SIM800 Hardware Design V1 08 2015 03 05 ee 6 09 of SIM Tech company Smart Machine Smart Decision 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 Max Unit Vir 0 3 0 7 V Vin 2 1 3 1 V VoL 7 0 4 2 4 V 4 51 Function of Serial Port Serial port Full modem device Contains data lines and 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 fable 11 Serial port supports the following baud rates 1200 2400 4800 9600 19200 38400 57600 1152006 5 230400 and 460800bps Autobauding only supports the followi
26. low level at this time 4 2 2 4 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 CMTE 1 If the temperature lt 30 C the following will be reported 1 If the temperature gt 85 the following will be reported module will be automatically powered off CMTE 2 If the temperature 40 C the following will be reported and the module will be a tomatically powered off CMTE 2 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 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 1 4 2 3 Reset Function 5 800 also have a RESET pin used to reset the module This function is used as an emergency reset only when AT command AT CPOWD 1I 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 is internal circuit of the RESET pin RESET Circuit 2 8V RESET ix Module Figure 14 Reset circuit The typica
27. mobiles Q Switch the cellular terminal or mobile off medical equipment may be sensitive to not operate normally for RF energy interference Switch off the cellular terminal or mobile before boarding an aircraft Make sure it is switched X off The operation of wireless appliances in an aircraft 1s 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 us 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 15 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
28. output easily So it s better to put big capacitor and ferrite bead near audio PA input TDD noise has 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 Support sniff mode 4 9 SIM Card Interface 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 Supports PCM interface and built in programmable transcoders for liner voice with transmission 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 SIM VDD 30 SIM DATA 3 SIM CLK 32 SIM RST 33 SIM DET 34 function Voltage supply for SIM card Support 1 8V or 3V SIM card SIM data input output SIM clock SIM reset SIM card detection It is recommended to use an ESD protection component such as ST www st com ESDA6V1 5W6 or ON SEMI www onsemi com
29. 5 577us s 4 615ms N A D on VBAT 4 Max 350mV Figure 8 VBAT voltage drop during transmit burst 4 1 1 Power Supply Pin The 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 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 8 800 Hardware Design V1 08 21 2015 03 05 company of SIM Tech 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 transmit 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 Note Hardware Power down voltage ts 3 0V 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 off SIM800 4 2 1 Power on 5 800 User can power on 51 800 by pulling down the PWRKEY pin at least second and then release This pin is a
30. A E 52 5 2 1 52 22225 52 2222 52 Umm 53 2112 tt AST 53 5 3 Recommended Layout Ne 53 6 Electrical Reliability and Radio Characteristics 2 2 1 0 54 6 1 Absolute Maximum 54 6 2 Recommended Operating 2 54 6 3 Digital Interface Characteristics cok oa 54 6 4 SIM Card Interface Characteristics ON basia a a RU Arun utu EAT amer 55 6 5 SIM VDD Characteristics N sedes podes ed a 55 6 6 VDD EXT Characteristigos 55 6 7 VRIC ride ME TO 55 6 8 ua BAT AV 56 6 9 Electro Static
31. DD EXT N Symbol Parameter Typ Ma Owtputvoltage 7B RN ERN EN 6 7 Characteristics Table 44 VRTC Characteristics SIM800 Hardware Design V1 08 55 2015 03 05 Smart Machine Smart Decision 6 8 Current Consumption VBAT 4V Table 45 Current consumption n 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 08 2015 03 05 Smart Machine Smart Decision 6 9 Electro Static Discharge SIM800 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 C Humidity 45 6 10 Radio Characteristics The following table shows the module conducted output power it is fo TS 05 05 technical specification requirement Table 47 GSM 900 and GSM 850 conducted RF D SIM800 Hardware Design V1 08 57 2015 03 05 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 the SIMS00 ted receive sensitivity it is tested under static condition tivi Table 49 Conducted RF receive dosi Y 6 12 Mei rating Frequencies The tabl
32. K 1 27 4 3 3 Wake Up SIM800 from Sleep Mode AT CSELKS1 27 4 4 CD RR 27 4 5 Serial Port and USB Interface iaa 28 451 Function of Serial Port 29 52 gt aci POU ROT V A 29 E AME 3l 4 5 4 Software Upgrade 32 4 5 5 Multiplex Function of Serial 33 4 6 We D e RR 33 35 47 1 Mterfaces 35 4 7 2 Microphone Interfaces gt 1 36 AJ Ame Blecttonic Characteristic iue orta Ee bts esu 36 Y E 36 4 8 B10 00 i o 37 4 9 SM MG dE RR 2 SSINDCOIOOSDDIICdIOIL 37 492 SIM Card Desioen Constdetalloli
33. LE 56 Smart Machine Smart Decision DCS 1800 AND PCS 1900 CONDUCTED RF OUTPUT nennen 58 CONDUCTED RE RECEIVE SENSITIVITY 58 58 MOISTURE CLASSIFICATION LEVEL AND FLOOR LIFE 60 TITS MERT 60 61 NS TIN _ 6 62 FERMSANDABBREVDATIONS 63 TETY C ACEON 65 SIM800_Hardware Design V1 08 6 2015 03 05 A compan lt O Smart Machine Smart Decision Figure Index FIGURE 1 SEMS00 FUNCTIONAL DIAGRAM 13 FIGURE 2 SIM800 PIN OUT DIAGRAM TOP 14 FIGURE 3 DIMENSIONS OF SIMSOU UNIT MIM perdes etus 18 FIGURE 4 RECOMMENDED PCB FOOTPRINT OUTLINE UNIT 2 0 2 2 000000000000000000000000000004 19 FIGURE S REFERENCE CIRCUIT OF THE VBAT Qui aps sap ep sex bre te tutt tug anes 20 FIGURE 6 REFERENCE CIRCUIT OF THE POWER SUPPLY
34. Normal power off procedure power off SIM800 by the PWRKEY pin Normal power off procedure power off SIM800 by AT command AT CPOWD 1 Abnormal power off Over voltage or under voltage automatic power off o Abnormal power off over temperature or under temperature automatic power off 4 2 2 1 Power off SIM800 by the PWRKEY Pin User can power off SIM800 by pulling down the PWRKEY pin for at least second and then release Please refer to the power on circuit The power off sequence 15 illustrated in following figure 8 800 Hardware Design V1 08 23 2015 03 05 m 5 lt 2009999 5 5 8 Smart Machine Smart Decision PWRKEY 15 lt 1 lt 335 input VIL 0 7V VDD EXT 7 Serial port Active Undefined Figure 13 Timing of Power off SIM800 by PWRKEY Note When module is powered off by pulling down PWRKEY 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 into a secure state to save data before completely shut down Before the completion of the power off procedure the module will send NORMAL POWER DOWN 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 15 low level at this time 4 2 2 2
35. PIO for details please see the document 1 Module supports a new keypad connection it support 5 5 2 amount 50 keypads meet full keyboard demand and the connection diagram 15 as follow vd KBCO 4 20K T 20K Module 9 KBRO 9 ow 9 9 9 Figure 40 Extended keypad reference circuit Note Do not change the 20KQ resistor in the diagram Customer should add a resistor to enhance ESD performance and the value of resistor should be less than the connection diagram is shown in figure 41 as an example 8 800 Hardware Design V1 08 43 2015 03 05 m E lt 2009999 5 5 8 Smart Machine Smart Decision 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 KBC and KBR when implement the extended keypad design The following figure is an example to explain this situation and can not be recognized if the two buttons were pressed at the same time Module Figure 42 Keypad detected Table 22 Pin definition of the keypad interface Name Pin Function Default state KBCO 51 Pull up KBCI 50 Pull down KBC2 49 Keypad matrix column Pull d
36. RANSLISNOR 22 21 1 4 2 1 2 4 41 4 4 00 31 FIGURE 24 USB REFERENCE CIRCUIT No 32 FIGURE 25 CONNECTION FOR SOFTWARE 2 1 1 0 10 40 44 2 2 0 33 FIGURE 26 RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER 34 FIGURE 27 RI BEHAVIOUR OF DATA CALUING 34 FIGURE 28 RI BEHAVIOUR OF URWOB RECEIVE 5 8 2 0011 00 6 06 0 nette 34 FIGURE 29 KT BEHAVIOUR MS ACALLE R enenokenthecvtsduussspentsds dao _ _____6_6 6_ ______ 6_ 35 FIGURE 30 SPEAKER CIRCUIT 35 FIGURE RET ERENCE _____________ 36 FIGURE 32 REFERENCE CIRCUIT OF THE 8 PIN SIM CARD 38 FIGURE 33 REFERENCE CIRCUIT OF THE 6 PIN SIM CARD eene 38 FIGURE 34 MOLEX 91225 SIM CARD HOLDER ontdus 39 FIGURA 3604 MPHENOL C707 10M006 512 SIM CARD HOLDER eere nennen nnne nnne nennen nenne een 40 FIGURE 3 Ger CM REFERENCE CIRCUIT _ ______________ 41 FIGURES CCD ____ _ ______ 42 FIGURE SS SD REFERENCE CIRCUM ____ _ ___ __ 42 FIGURE 39 TRADITIONAL KEYPAD REFERENCE
37. S UART1_DTR Figure 19 Connection of the serial port If the voltage of UART 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 UART1_TXD UART1_RXD UART1_RTS UART1_CTS UART1_DTR __ UART1 RIO Figure 20 Level converting by resistor If the voltage of UART 15 3V or3 3V user also can use following reference circuits UART1 RXD UART1 TXD Q Module Figure 21 Isolation circuit by diodes 8 800 Hardware Design V1 08 30 2015 03 05 IM Tech company of S Smart Machine Smart Decision Note when a diode used to isolate voltage cross customer should notice that there s voltage drop on the diode And the signal s voltage level should meet the customer s electrical character The recommend diode is Schottky diode e g RBSSIV 30TE 17 and SDM20U40 If the voltage of UART is 5V on customer side customer can use the following reference circuits VDD_EXT UART1_TXD Figure 22 TX level converting by transistor VDD_EXT UART1 RXD Figure23 RX level converting by transistor Note The recommend Transistors part numbers 2SC4617TLR and 81152 4 5 3 USB Interface USB interface supports software debug function When power on the module connect USB VBUS USB DP USB DN and GND to PC then install the driver successfully a
38. T CFUN 1 Full function default AT CFUN 4 Flight mode disable RF function Table 7 The current consumption of function modes BS PA MFRMS 5 lt Fun gt Current consumption mA CSCLK 1 0 0 8 1 1 3 4 0 8 8 800 Hardware Design V1 08 26 2015 03 05 eec Qoe 0960906 09 company of SIM Tech Minimum function mode minimizes the current consumption to the 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 Smart Machine Smart Decision 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 DTR is in high 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 the serial port is not accessible Note Autobauding is the default setting Module 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 foll
39. UART port could be recognized by the customer could achieve the software Debug purpose with this UART port The following diagram 1s recommended 8 800 Hardware Design V1 08 3l 2015 03 05 m E lt 2009999 5 5 8 Smart Machine Smart Decision USB VBUSOQ 220 Module 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 ESD9MS 0ST5G The USB DP and USB DN should be routed in differential traces Note please reserve the USB interface or test point for debug Table 10 USB VBUS operation voltage Pin Min Typ Max Unit USB VBUS 4 3 5 0 7 0 V Note USB VBUS is only used for USB inserting detection can not be used as a power source 4 5 4 Software Upgrade and Debug USB and UART interfaces be used for firmware upgrade If customer upgrading firmware via the USB port SIM800 must be powered first then connect USB USB DP USB DN to PC There is no need to operate PWRKEY pin in the whole procedure when SIM800 detects USB VBUS and could communicate normally by USB DP and USB DN module will enter USB download mode automatically Note When only USB DP and USB DN connected no USB VBUS customer need to pull down before power on the module then press the PWRKEY button the module will enter download mode If customer upgrading firmwa
40. 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 is PCM SIM800 is designed with power saving technique so that the current consumption is as low as 1 2mA sleep mode SIM800 integrates 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 51 800 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 2mA BS PA MFRMS 9 SIMS00 Quad band GSM 850 EGSM 900 DCS 1800 PCS 1900 SIM800 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 Class 4 2W GSM850 EGSM900 Class 1 1W DCS1800 PCS1900 GPRS multi slot class 12 default Frequency bands Transmitting power GPRS connectivity e 8 800 Hardware Design V1 08 10 2015 03 05 gue 8 5 un e mi 5 un 5 e SIM800_Hardware Design_V1 08
41. e Figure 51 Recommended PCB layout 8 800 Hardware Design V1 08 53 2015 03 05 A compan 6 Electrical Reliability and Radio Characteristics C Smart Machine Smart Decision 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 SIM800 Table 38 Absolute maximum ratings VBAT V Peak Current 0 2 0 A USB VBUS 12 V Ie 16 mA Io 16 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 Tsrc Storage temperature 45 90 6 3 Digital Interface Characteristics Table 40 Digital interface characteristics Vm High level input voltage V Vir Low level input voltage 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 08 54 2015 03 05 Smart Machine Smart Decision 6 4 SIM Card Interface Characteristics Table 41 SIM card interface characteristic 6 6 VDD EXT Characteristics Table 43 V
42. e shows module s operating frequency range it 15 followed by the 3GPP TS 05 05 technical specification requirement Table 50 Operating frequencies SIM800 Hardware Design 1 08 58 2015 03 05 A compan 7 Manufacturing lt Smart Machine Smart Decision 7 1 Top and Bottom View of SIM800 RE SIMS 52 105 271603 SH MPBb141515255558 IMETSBe2SoidcaieS356c FCC 1214 C 0678 Figure 52 Top and Bottom View of SIM800 7 2 Typical Solder Reflow Profile standard temperature curve and parameter ranges ape g 150 210 T 70 120 Sec Saai odiis Reflow zone Cooling zone Standard temperature curve and the parameter range of lead free processes Figure 53 Typical Solder Reflow Profile Note Please refer to Module secondary SMT UGD for more information about the module shipping and manufacturing 8 800 Hardware Design V1 08 59 2015 03 05 eec Qoe 09 of SIM Tech company Smart Machine Smart Decision 7 3 Moisture Sensitivity Level 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 f
43. ection will give some guidelines 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 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 routing of GSM and Bluetooth RF traces The RF connector is used for conducted test so keep it as close to the GSM ANT pin as possible Antenna matching circuit should be closed to the antenna Keepthe RF traces as 500 The RF traces should be kept far away from high speed signals and strong disturbing source Ifusinga 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 flow 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 Ca
44. etwork 64ms On 300ms Off GPRS communication 15 established Reference circuit is recommended in the following figure Module NETLIGHT Figure 45 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 66 Operating status indication 8 800 Hardware Design V1 08 48 2015 03 05 eec 009 09 company of SIM Tech 4 18 KPLED Smart Machine Smart Decision SIM800 provides one open drain LED driver pin Table 35 Pin definition of the KPLED KPLED Sink current for keypad LED Reference circuit is recommended in the following figure VBAT Module x KPLED Figure 46 KPLED driver reference circuit Table 36 KPLED specification KPLED 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 RF SYNC Transmit synchronization signal Note Do not pull up RF SYNC The timing of the synchronization signal 15 shown the following figure High level of the RF SYNC signal indicates increased power consumption during transmission 8 800 Hardware Design V1 08 49 2015 03 05 m 5 lt 209999 21 5 5 8 Smart Machine Smar
45. hone input characteristics Parameter Min Typ Max Unit Mic biasing voltage 1 9 22 V Working Current 2 mA Input impedance differential 13 20 21 Idle channel noise 67 dBm Input level 40dBm0 29 dB SINAD Input level 0dBm0 69 dB Table 15 Audio output characteristics parameter Conditions Min Typ Max Unit Normal output 32 receiver 90 mW 4 7 4 GSM signal could interfere audio by coupling conducting Coupling noise could be filtered by adding 33 pF and 10 capacitor over audio lines 33pF capacitor could eliminate noise from GSM900MHz 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 15 from GSM1800MHz fervency so customer should develop this filter solution according to field test result GSM antenna 15 the key coupling interfering source of TDD noise 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 and another group placed near to connector 8 800 Hardware Design V1 08 36 2015 03 05 eec Qoe 0960906 09 company of SIM Tech Smart Machine Smart Decision Conducting noise is mainly caused by the VBAT drop If Audio PA was powered by VBAT directly then there will be some cheep noise from SPK
46. in definition of the PWM PWMO 35 PWMO multiplex with GPIO22 PWMI 36 PWMI multiplex with GPIO23 Note 51 800 can only support 1 PWM synchronously if customer set PIN 35 as PWM so PIN36 can only be used as GPIO PWM output frequency varies from 0 100KHz The output of 200Hz under 200Hz Two 7 bit unsigned binary parameters are used for the output period and for the duty cycle The AT command 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 drives buzzer 15 shown in the following figure VBAT Module Figure 44 Reference circuit of PWM drive buzzer Table 30 PWM output characteristics Working voltage 2 5 Working current 4 16 mA Note PWM pin must keep low when module in the boot process Table 31 PWM multiplex function PWMO PWMO GPIO22 GPIO22 PWMI 36 GPIO23 PWMI GPIO23 8 800 Hardware Design V1 08 47 2015 03 05 Qoe 0696 009 of SIM Tech company Smart Machine Smart Decision 4 16 Network Status Indication Table 32 Pin definition of the NETLIGHT NETLIGHT 52 Network Status Indication The NETLIGHT pin can be used to drive a network status indication LED The status of this pin is listed in following table Table 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 n
47. ke sure that SIM card holder should far away from GSM antenna while in PCB layout SIM traces should keep away from RF lines 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 a 100nF capacitor on SIM VDD line and keep close to the holder Add some TVS and the parasitic capacitance should not exceed 50pF and 220 resistor in serials SIM signal could enhance ESD protection SIMS800 Hardware Design V1 08 38 2015 03 05 e e Smart Machine Smart Decision 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 TE 5 0 REF FULL STROKE 2 0 MAX WY OW Y MOTE 3 8228 000 SDA 91228 FMTT HL EDGE RECOMMENDED LAYOUT ex NOTES SEE PRODUCT SPECIFICATION 5 99020 007 2 PACKING AMD REEL DETAIL SEE 5 228 9001 SHT 1 3 PUSH RODYLEVER MUST BEYOND HOUSING EDGE IN THIS AREA 4 TAILS ON EACH SIDE OF CONNECTOR TO LIE WITHIN O l2mm OF EACH OTHER HOLISING LIQUID CRYSTAL POLYMER LCP GLASS FILL ULS4 V O COLOUR BLACK TERMINAL 0 15 PHOSPHOR BRONZE D lum OVER IM CONTACT AREA Zaum MIN 5 OM SMT TAILS PUSH
48. l 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 8 800 Hardware Design V1 08 Z3 2015 03 05 e es Qoe 069 eec Com A of SIM Tech company Smart Machine Smart Decision 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 7 V RESET Vit 0 6 V aul dte 105 ms The reset scenarios are illustrated in the following figures gt RESET t gt 105ms VLS2AV IV 0 6V t 400us VDD EXT lt 1 5 STATUS E 5 2 75 Figure 15 Reset timing sequence 4 3 Power Saving Mode SIM800 has two power saving modes Minimum function mode and sleep mode AT command AT CSCLK 1 can be used to set SIM800 into sleep mode 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 AT CFUN lt fun gt The command provides the choice of the function levels lt fun gt 0 1 4 AT CFUN 0 Minimum function A
49. loor life Level Floor Life out of bag at factory ambient lt 30 C 60 RH or as stated 1 Unlimited at lt 30 C 85 RH 2 year 2 4 weeks 3 168 hours 4 72 hours 48 hours 5a 24 hours Mandatory bake before use After bake it must be reflowed within the time limit specified on the label NOTES 1 If the vacuum package is not open for 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 055 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 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 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 C 5 C lt 5 192 hours 120 C 5 C lt 5 4 hours 8 800 Hardware Design V1 08 60 2015 03 05 compan lt z 8 Appendix I Related Documents Table 53 Related Documents SN 5 4
50. lready pulled up to VBAT in the module internal so external pull up is not necessary Reference circuit is shown as below Power on off logic Turn on off impulse Module Figure 10 Power on off module using transistor PWRKEY Power on off logic gum Module Figure 11 Power on off module using button The power on timing 15 illustrated as following figure 8 800 Hardware Design V1 08 22 2015 03 05 m E lt 2009999 5 5 8 Smart Machine Smart Decision gt 1 48 VBAT M gt t gt 1s as PWRKEY lt 0 7 INPUT T 100ms VDD EXT 235 STATUS Serial Port Undefind 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 RDY This does not appear when autobauding function 15 active Note User can use AT command 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 off SIM800 SIM800 will be powered off in the following situations
51. ng baud rates 1200 2400 4800 9600 19200 38400 57600 and 115200bps The default setting is autobauding Autobauding allows SIM800 to automatically detect the baud rate of the host device Pay more attention to the following requirements Synchronization between DTE and DCE When DCE powers on with autobauding enabled firstly user must send character or to synchronize the baud rate It is recommended to send until DTE receives response which means DTE and DCE are correctly synchronized For more information please refer to the AT command AT IPR Restrictions of autobauding operation The DFE serial port must be set at 8 data bits no parity and stop bit The URC such as CFUN 1 and CPIN READY will not be reported Note User can use AT command AT IPR x to set a fixed baud rate and the setting will be saved to non volatile flash memory automatically After the configuration is set as fixed baud rate the URC such as RDY CFUN I and CPIN READY will be reported when 81 800 is powered on 4 5 2 Serial Port The following figure shows the connection between module and client DTE 8 800 Hardware Design V1 08 29 2015 03 05 m E lt 2009999 5 5 8 Smart Machine Smart Decision Module DCE Customer DTE Serial Port Serial Port UART1_TXD UART1_RXD UART1_RTS UART1_CT
52. nnne aiat nna ases eee FIGURE 51 RECOMMENDED PCB LAYOUT FIGURE 52 AND BOTTOM VIEW OF SIM800 FIGURE 53 TYPICAL SOLDER REFLOW PROFILE SIMS800 Hardware Design V1 08 8 2015 03 05 xem eet de Smart Machine Smart Decision Version History SIM800 Hardware Design V1 08 9 2015 03 05 A compan lt O 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 1800MHz 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
53. no mobile fee or a invalid SIM card While you are in this condition and need emergent help please remember using emergency calls In order to make or receive calls the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength Some networks do not allow for emergency call if certain network services or phone features are in use e g lock functions fixed dialing etc You may have to deactivate those features before you can make an emergency call Also some networks require that a valid SIM card be properly inserted in the cellular terminal or mobile 8 800 Hardware Design V1 08 65 2015 03 05 6 09 9 Bi e 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 8 800 Hardware Design V1 08 66 2015 03 05
54. ooth CS Coding Scheme CSD Circuit Switched Data CTS Clear to Send DTE Data Terminal Equipment typically computer terminal printer DTR Data Terminal Ready DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM ESD Electrostatic Discharge ETS European Telecommunication Standard FR Full Rate GPRS General Packet Radio Service GSM Global Standard for Mobile Communications HR Half Rate IMEI International Mobile Equipment Identity Li ion Lithium Ion MO Mobile Originated MS Mobile Station GSM engine also referred to as TE MT Mobile Terminated PAP Password Authentication Protocol PBCCH Packet Broadcast Control Channel PCB Printed Circuit Board PCL Power Control Level PCS Personal Communication System also referred to as GSM 1900 PDU Protocol Data Unit PPP Point to point protocol RF Radio Frequency RMS Root Mean Square value RTC Real Time Clock RX Receive Direction SIM Subscriber Identification Module SMS Short Message Service TDD Time Division Distortion TE Terminal Equipment also referred to as DTE TX Transmit Direction SIMS800 Hardware Design V1 08 63 2015 03 05 Smart Machine Smart Decision SIMS800 Hardware Design V1 08 64 2015 03 05 A compan IV Safety Caution 2 502222 25 cee Smart Machine Smart Decision Table 56 Safety caution Marks Requirements When in a hospital or other health care facility observe the restrictions about the use of
55. owing methods can wake up the module Pull down DTR pin The serial port will be active after DTR pin is pulled to low level for about 50ms Receive a voice or data call from network Receive a SMS from network Receive external interrupt 4 4 RTC Backup VRTC is an input pin when the VBAT isnot supplied by external power When the VBAT power supply is in present and the backup battery is 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 Large capacitance Capacitor Figure 16 RTC supply from capacitor 8 800 Hardware Design V1 08 27 2015 03 05 compan Tech lt 5 Non chargeable battery backup _ Non chargeable Backup Battery Smart Machine Smart Decision Figure 17 RTC supply from non chargeable battery Rechargeable battery backup Rechargeable Backup Battery Figure 18 RTC supply from rechargeable battery Note RTC can not be directly connected to VBAT VRTC refer to table 44 4 5 Serial Port and USB Interface SIM800 provides one unbalanced asynchronous serial port The module is designed as DCE Data Communication Equipment The following figure shows the
56. own KBC3 48 Pull down KBC4 47 Pull down KBRO 44 Pull down KBRI 43 Pull down KBR2 42 Keypad matrix row Pull down KBR3 4 Pull down KBR4 40 Pull down SIM800_Hardware Design V1 08 44 2015 03 05 069 ee 09 company of SIM Tech Table 23 Keypad multiplex function Smart Machine Smart Decision GPIO10 KBCI 50 KBCI GPIO9 KBC2 49 KBC2 GPIO8 KBC3 48 KBC3 GPIO7 KBC4 47 KBC4 GPIO6 KBRO 44 KBRO GPIOS5 KBRI 43 KBRI GPIO4 KBR2 42 KBR2 GPIO3 KBR3 41 KBR3 GPIO2 KBR4 40 KBR4 GPIOI Note Multiplex Function need different software version 4 12 2 BUS The SIM800 provides I2C interface It has the following features Compliant master mode operation Adjustable 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 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 open drain output SDA 38 I2C serial bus data open drain output Note I2C has been pulled up to 2 8V via 4 7 inside Table 25 multiplex function SCL GPIO24 SDA 38 SDA GPIO25 8 800 Hardware Design V1 08 45 2015 03 05 eec 009 09
57. r conducted test If the space between GSM ANT pin and antenna is not enough the matching circuit could be simplified as the following figure SIMS800 Hardware Design V1 08 50 2015 03 05 Smart Machine Smart Decision GND Pin59 Module GSM ANT 2 O GSM Antenna Pin60 C101 C102 Figure 49 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 BT ANT to connect a Bluetooth antenna The Bluetooth antenna must be matched properly to achieve best performance so the matching circuit is necessary the connection 1s recommended as the following figure Module BI ANT Pin 53 BT R201 Antenna Figure 50 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 08 51 2015 03 05 A compan 5 PCB Layout lt O 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 15 to redesign PCB layout Making good PCB layout will save developing schedule and cost as well This s
58. rd 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 SIM VDD signals which should be far away from power and high speed signal SIM800_Hardware Design V1 08 22 2015 03 05 A compan 5 2 4 Audio Interface lt CQheece 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 5 3 Recommended Layout Based on above principles recommended layout 15 shown in the following illustration MWETLIGHT PWRKEY 1 51 GND 2 50 KBC1 49 KBC2 48 KBC3 47 KBC4 46 45 GND SIM800 44 JART i 11 Top View F KBR3 PCM IN 12 40 KBR4 GPIO19 13 39 GND PCM 14 is SCL EXT 15 37 SDA RESET 16 36 PWM1 GND 17 i5 UC Memo Interface Interfac
59. re via the UART port it is strongly recommended that reserve the TXD 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 8 800 Hardware Design V1 08 32 2015 03 05 m E lt 2009999 5 5 8 Smart Machine Smart Decision UART1 TXD 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 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 DTR 3 DTR GPIO22 RI 4 RI GPIO23 DCD 5 DCD GPIO24 CTS CTS URXD2 IN RTS 8 RTS UTXD2 OUT TXD 9 TXD UTXD1 OUT RXD 10 RXD URXDI IN Note customer could use the AT CMNRP Iset 81 800 to the dual UART function for the detail application notes please contact SIMCom 4 6 RI Behaviors Table 12 RI Behaviors State RI response Standby High The pin 15 changed to low When any of the following events occur the pin will be changed to high 1 Establish the call 2 Hang up the call SIMS800 Hardware Design V1 08 33 2015 03 05
60. t Decision 220us 57705 Transmit burst RF SYNC Figure 47 RF SYNC signal during transmit burst 4 20 Antenna Interface There are two antenna ports for SIM800 GSM antenna port named GSM ANT and Bluetooth antenna port named BT ANT RF interfaces of the two antenna ports both have the impedance of 500 The input impendence of the antenna should be 500 and the VSWR should be less than 2 Itisrecommended that GSM antenna and Bluetooth antenna b placed as far as better Theisolations of the two antenna should be more than 30db NOTE About the RF trace layout please refer to AN SMT Module RF Reference Design Guide 4 20 1 GSM Antenna Interface There is GSM antenna pad named GSM ANT to connect aGSM 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 GSMantenna must be matched properly to achieve the best performance so the matching circuit is necessary the 15 recommended as following GND 4 Pin59 Module RF connector GSM Antenna GSM ANT zn Pin60 T T GND 5 mm CORE Pin61 T Figure 48 GSM antenna matching circuit R101 C101 C102 are the matching circuit the values depend on antenna debug result Normally R101 15 00 C101 and C102 are not mounted The RF connector is used fo
61. this GPRS case power consumption is related with network settings e g power DATA control 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 the PWRKEY The power management unit shuts down the power supply for the baseband part of the module and only the power supply for the RTC 15 remained Software is not active The serial port 15 not accessible Power supply connected to VBAT remains applied AT command can be used to set the module to a minimum functionality mode without removing the power supply In this mode the RF part of the module will not work or the SIM card will not be accessible or both RF part and SIM card will be closed and the serial port 1s still accessible The power consumption in this mode is lower than normal mode 8 800 Hardware Design V1 08 12 2015 03 05 eec Qoe 0960906 09 company of SIM Tech 2 3 SIM800 Functional Diagram Smart Machine Smart Decision The following figure shows a functional diagram of SIM800 GSM baseband engine e PMU e Antenna interfaces e Other interfaces Power Radio GSM Supply Power Management Unit Frequency NG RTC ice Digital Interface nterface GPIOs gt Audio Analog Digital UART Baseband Baseband SIM
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