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SIM Tech SIMCom SIM800 Hardware Design

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  • Page 1 SIM800_Hardware Design_V1.09...
  • Page 2 Smart Machine Smart Decision Document Title SIM800 Hardware Design Version 1.09 Date 2016-06-30 Status Release Document Control ID SIM800_Hardware Design_V1.09 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.

  • Page 3: Table Of Contents

    Smart Machine Smart Decision Contents Introduction ..............................10 SIM800 Overview ............................10 2.1. SIM800 Key Features ..........................10 2.2. Operating Modes ............................ 12 2.3. SIM800 Functional Diagram ........................13 Package Information ........................... 14 3.1. Pin Out Diagram ............................. 14 3.2. Pin Description ............................
  • Page 4 Smart Machine Smart Decision 4.15. PWM ..............................45 4.16. Network Status Indication ........................46 4.17. Operating Status Indication ........................47 4.18. KPLED ..............................47 4.19. RF Synchronization Signal ........................48 4.20. Antenna Interface ........................... 48 4.20.1. GSM Antenna Interface ........................49 4.20.2.
  • Page 5 Smart Machine Smart Decision Table Index TABLE 1: SIM800 KEY FEATURES ..........................10 TABLE 2: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ......12 TABLE 3: OVERVIEW OF OPERATING MODES ......................12 TABLE 4: PIN DESCRIPTION ............................15 TABLE 5: RECOMMENDED ZENER DIODE ......................
  • Page 6 Smart Machine Smart Decision TABLE 47: OPERATING FREQUENCIES ........................57 TABLE 48: MOISTURE CLASSIFICATION LEVEL AND FLOOR LIFE ..............59 TABLE 49: BAKING REQUIREMENTS ........................59 TABLE 50: RELATED DOCUMENTS ........................... 60 TABLE 51: TERMS AND ABBREVIATIONS ........................ 61 TABLE 52: SAFETY CAUTION ............................. 63 SIM800_Hardware Design_V1.09 2016-06-30...
  • Page 7 Smart Machine Smart Decision Figure Index FIGURE 1: SIM800 FUNCTIONAL DIAGRAM ......................13 FIGURE 2: SIM800 PIN OUT DIAGRAM (TOP VIEW) ....................14 FIGURE 3: DIMENSIONS OF SIM800 (UNIT: MM) ....................18 FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE (UNIT: MM) ..............19 FIGURE 5: REFERENCE CIRCUIT OF THE VBAT INPUT ..................
  • Page 8 Smart Machine Smart Decision FIGURE 47: GSM SIMPLE ANTENNA MATCHING CIRCUIT .................. 49 FIGURE 48: BLUETOOTH ANTENNA MATCHING CIRCUIT .................. 50 FIGURE 49: RECOMMENDED PCB LAYOUT ......................52 FIGURE 50: TOP AND BOTTOM VIEW OF SIM800 ....................58 FIGURE 51: TYPICAL SOLDER REFLOW PROFILE ....................58 SIM800_Hardware Design_V1.09 2016-06-30...
  • Page 9 Smart Machine Smart Decision Version History Date Version Description of change Author Ma Honggang 2013-07-29 1.00 Origin Teng Lili Update RESET pin parameter; 2013-08-05 1.01 Ma Honggang Update figure 12, 13, 15. Update figure 3 and figure 23; 2013-08-21 1.02 Ma Honggang Update chapter 7.3;...

  • Page 10: Introduction

    Smart Machine Smart Decision 1. Introduction This document describes SIM800 hardware interface in great detail. This document can help user to quickly understand SIM800 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.
  • Page 11 Smart Machine Smart Decision  GPRS multi-slot class 1~12 (option)  Temperature range 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 ...

  • Page 12: Operating Modes

    Smart Machine Smart Decision Table 2: Coding schemes and maximum net data rates over air interface Coding scheme 1 timeslot 2 timeslot 4 timeslot CS-1 9.05kbps 18.1kbps 36.2kbps CS-2 13.4kbps 26.8kbps 53.6kbps CS-3 15.6kbps 31.2kbps 62.4kbps CS-4 21.4kbps 42.8kbps 85.6kbps 2.2.

  • Page 13: Sim800 Functional Diagram

    Smart Machine Smart Decision 2.3. SIM800 Functional Diagram The following figure shows a functional diagram of SIM800:  GSM baseband engine   RF part  Antenna interfaces  Other interfaces Radio Power Frequency Supply Power Management Unit Digital Analog Interface Interface GPIOs...

  • Page 14: Package Information

    Smart Machine Smart Decision 3. Package Information 3.1. Pin Out Diagram Figure 2: SIM800 pin out diagram (Top view) SIM800_Hardware Design_V1.09 2016-06-30...

  • Page 15: Pin Description

    Smart Machine Smart Decision 3.2. Pin Description Table 4: Pin description Pin name Description Comment number Power supply SIM800 supplies 3 VBAT pins, and the power range is from 3.4V to 4.4V. Zener diode is Strongly Power supply should provide VBAT 55,56,57 recommended to anti surge...
  • Page 16 Smart Machine Smart Decision KBR3 KBR2 KBR1 KBR0 GPIO GPIO17 Programmable general purpose input and output. GPIO19 NETLIGHT Network status Can not multiplex with GPIO function. STATUS Power on status Serial port Data terminal ready Ring indicator Data carrier detect Clear to send Keep floating if unused.
  • Page 17 Smart Machine Smart Decision Impendence must BT_ANT Bluetooth antenna port controlled to 50Ω. RF synchronization RF_SYNC RF burst synchronous signal Do not pull up Other signal RESET Reset input(Active low) KPLED Drive keypad backlight SIM800_Hardware Design_V1.09 2016-06-30...

  • Page 18: Package Dimensions

    Smart Machine Smart Decision 3.3. Package Dimensions Figure 3: Dimensions of SIM800 (Unit: mm) SIM800_Hardware Design_V1.09 2016-06-30...
  • Page 19 Smart Machine Smart Decision Figure 4: Recommended PCB footprint outline (Unit: mm) Note: Keep copper out of area B and C. SIM800_Hardware Design_V1.09 2016-06-30...

  • Page 20: Application Interface

    Smart Machine Smart Decision 4. Application Interface 4.1. Power Supply The power supply range of SIM800 is from 3.4V to 4.4V. Recommended voltage is 4.0V. The transmitting burst will cause voltage drop and the power supply must be able to provide sufficient current up to 2A. For the VBAT input, a bypass capacitor (low ESR) such as a 100µF is strongly recommended.

  • Page 21: Power Supply Pin

    Smart Machine Smart Decision If there is a high drop-out between the input and the desired output (VBAT), a DC-DC power supply will be preferable because of its better efficiency. The following figure is the reference circuit. FB101 is very important, customer can get better EMI feature with appropriate filtering bead.

  • Page 22: Monitoring Power Supply

    Smart Machine Smart Decision power voltage drops below 3.4V, the module may be shut down automatically. The PCB traces from the VBAT pins to the power supply must be wide enough (at least 80mil) 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.

  • Page 23: Power Off Sim800

    Smart Machine Smart Decision T>1.4s VBAT T>1.2s <0.7V PWRKEY (INPUT) T=100ms VDD_EXT t>3s STATUS Serial Port Active Undefind 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.
  • Page 24 Smart Machine Smart Decision PWRKEY 1.5s<t<33s (input) VIL<0.7V VDD_EXT STATUS t>3s Serial port Undefined Active 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.

  • Page 25: Reset Function

    Smart Machine Smart Decision 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 low level at this time. 4.2.3. Reset Function SIM800 also have a RESET pin used to reset the module.

  • Page 26: Power Saving Mode

    Smart Machine Smart Decision t>105ms RESET >2.4V <0.6V t<400us VDD_EXT 2.7s STATUS Figure 15: Reset timing sequence 4.3. Power Saving Mode SIM800 has two power saving modes: Minimum function mode and sleep mode. The AT command “AT+CSCLK=1”can be used to set SIM800 into sleep mode. The AT command “AT+CFUN=<fun>” can be used to set SIM800 into minimum function.

  • Page 27: Wake Up Sim800 From Sleep Mode (At+Csclk=1)

    Smart Machine Smart Decision network but the 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.

  • Page 28: Serial Port And Usb Interface

    Smart Machine Smart Decision  Rechargeable battery backup Module VRTC 1.5K Core Rechargeable Backup Battery Figure 18: RTC supply from rechargeable battery Note: RTC can not be directly connected to the VBAT, VRTC refer to table 44. 4.5. Serial Port and USB Interface SIM800 provides one unbalanced asynchronous serial port.

  • Page 29: Function Of Serial Port

    Smart Machine Smart Decision 4.5.1 Function of Serial Port Serial port:  Full modem device.  Contains data lines TXD and RXD, hardware flow control lines RTS and CTS, status lines DTR, DCD and  Serial port can be used for CSD FAX, GPRS service and AT communication. It can also be used for multiplex function.
  • Page 30 Smart Machine Smart Decision Module(DCE) Customer(DTE) Serial Port Serial Port UART1_TXD UART1_RXD UART1_RTS UART1_CTS UART1_DTR UART1_DCD RING UART1_RI Figure 19: Connection of the serial port If the voltage of UART is 3.3V, the following reference circuits are recommended. If the voltage is 3.0V, please change the resistors in the following figure from 5.6K to 14K.

  • Page 31: Usb Interface

    Smart Machine Smart Decision 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 signal’s voltage level should meet the customer’s electrical character. The recommend diode is Schottky diode e.g.

  • Page 32: Software Upgrade And Debug

    Smart Machine Smart Decision VBUS USB_VBUS 22Ω USB _ DN USB _ DN 22Ω USB _ DP USB_DP 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 ESD9M5.0ST5G).

  • Page 33: Ri Behaviors

    Smart Machine Smart Decision Module(DCE) I/O Connector Serial Port UART1_TXD UART1_RXD PWRKEY 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. 4.6.

  • Page 34: Audio Interfaces

    Smart Machine Smart Decision Figure 26: RI behaviour of voice calling as a receiver HIGH Establish the call Hang up the call Idle Ring Figure 27: RI behaviour of data calling as a receiver HIGH 120ms Receive SMS Idle Figure 28: RI behaviour of URC or receive SMS However, if the module is used as caller, the RI will remain high.

  • Page 35: Speaker Interfaces Configuration

    Smart Machine Smart Decision “AT+CMIC” 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.

  • Page 36: Tdd

    Smart Machine Smart Decision Working Current KΩ Input impedance(differential) Idle channel noise Input level:-40dBm0 SINAD Input level:0dBm0 Table 14: Audio output characteristics parameter Conditions Unit =32 Ω receiver Normal output 4.7.4. GSM signal could interfere audio by coupling or conducting. Coupling noise could be filtered by adding 33 pF and 10pF capacitor over audio lines.33pF capacitor could eliminate noise from GSM900MHz, while 10pF capacitor could eliminate noise from DCS1800MHz frequency.

  • Page 37: Sim Card Application

    Smart Machine Smart Decision FAST 64 kbps SIM card. Both 1.8V and 3.0V SIM card are supported. The SIM interface is powered from an internal regulator in the module. 4.9.1. SIM Card Application Table 15: SIM pin definition Name function SIM_VDD Voltage supply for SIM card.

  • Page 38: Sim Card Design Consideration

    Smart Machine Smart Decision SIM Card VSIM SIM_RST SIM_CLK SIM_PRE Module C707 10M006 512 2 SIM_DATA SMF12C Figure 33: Reference circuit of the 6-pin SIM card holder 4.9.2. SIM Card Design Consideration SIM card circuit is susceptible to interference, causing the SIM card failures or some other situations, so it is strongly recommended to follow these guidelines while designing: ...
  • Page 39 Smart Machine Smart Decision Figure 34: Molex 91228 SIM card holder Table 16: Pin description (Molex SIM card holder) Pin name Signal Description SIM_VDD SIM card power supply SIM_RST SIM card reset SIM_CLK SIM card clock Connect to GND Connect to GND Not connect SIM_DATA SIM card data I/O...

  • Page 40: Pcm Interface

    Smart Machine Smart Decision Figure 35: Amphenol C707 10M006 512 SIM card holder Table 17: Pin description (Amphenol SIM card holder) Pin name Signal Description SIM_VDD SIM card power supply SIM_RST SIM card reset SIM_CLK SIM card clock Connect to GND Not connect SIM_DATA SIM card data I/O...

  • Page 41: Pcm Interface

    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 19: PCM Specification Feature Specification Line Interface Format Linear(Fixed) Data length 16bits(Fixed) PCM Clock/Sync Source Master Mode(Fixed) PCM Clock Rate 256Khz(Fixed)
  • Page 42 Smart Machine Smart Decision KBC0 KBC1 KBC2 KBC3 KBC4 KBR0 Module KBR1 KBR2 KBR3 KBR4 Figure 37: Traditional keypad reference circuit Note: According to the traditional 5*5 keypad matrix, when there are unused KBCs or KBRs, user can execute AT command to define unused KBCs and KBRs as GPIO, for details please see the document [1]. Module supports a new keypad connection, it can support 5*5*2 amount 50 keypads, meet full keyboard demand, and the connection diagram is as follow: KBC0...
  • Page 43 Smart Machine Smart Decision KBCx <1K Module KBRx Figure 39: 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.

  • Page 44: I2C Bus

    Smart Machine Smart Decision 4.12. I2C BUS The SIM800 provides an 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 ...

  • Page 45: Adc

    Smart Machine Smart Decision PWRKEY (INPUT) t<1.9s t<1.9s GPIO17 t<=10us GPIO19 Figure 41: GPIO timing sequences 4.14. ADC Table 23: Pin definition of the ADC Pin name Pin number Description Analog to Digital Converter SIM800 provides an auxiliary ADC, which can be used to measure the voltage. Customerr can use AT command “AT+CADC”...

  • Page 46: Network Status Indication

    Smart Machine Smart Decision output period and for the 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 is shown in the following figure: VBAT Module 4.7K...

  • Page 47: Operating Status Indication

    Smart Machine Smart Decision 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 is recommended in the following figure: VBAT Module 4.7K NETLIGHT Figure 43: Reference circuit of NETLIGHT...

  • Page 48: Rf Synchronization Signal

    Smart Machine Smart Decision VBAT Module KPLED Figure 44: KPLED driver reference circuit Table 32: KPLED specification Pin name Unit KPLED 4.19. RF Synchronization Signal The synchronization signal serves to indicate growing power consumption during the transmit burst. Table 33: Definition of the RF_SYNC pin Pin name Pin number Description...

  • Page 49: Gsm Antenna Interface

    Smart Machine Smart Decision named BT_ANT; The RF interfaces of the two antenna ports both have the impedance of 50Ω  The input impendence of the antenna should be 50Ω, and the VSWR should be less than 2.  It is recommended that GSM antenna and Bluetooth antenna be placed as far as better. ...

  • Page 50: Bluetooth Antenna Interface

    Smart Machine Smart Decision package model supplier 0201 LXES03AAA1-154 MuRata 0402 LXES15AAA1-153 MuRata 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 is recommended as the following figure: Module BT_ANT...

  • Page 51: Pcb Layout

    Smart Machine Smart Decision 5. PCB Layout Usually, most electronic products with good performance are based on good PCB layout. Poor PCB layout will lead to lots of issues, like TDD noise, SIM card undetected, etc. The final solution for these problems is to redesign PCB layout.

  • Page 52: Audio Interface

    Smart Machine Smart Decision 5.2.4 Audio Interface 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.

  • Page 53: Electrical, Reliability And Radio Characteristics

    Smart Machine Smart Decision 6. Electrical, Reliability and Radio Characteristics 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 35: Absolute maximum ratings Symbol Unit VBAT...

  • Page 54: Sim Card Interface Characteristics

    Smart Machine Smart Decision SIM Card Interface Characteristics Table 38: SIM card interface characteristic Symbol Parameter Unit High-level input current Low-level input current High-level input voltage 0.27 Low-level input voltage 1.62 High-level output voltage 0.36 Low-level output voltage SIM_VDD Characteristics Table 39: SIM_VDD characteristics Symbol Parameter...

  • Page 55: Current Consumption (Vbat=4V)

    Smart Machine Smart Decision Current Consumption (VBAT=4V) Table 42: Current consumption Symbol Parameter Conditions Unit Voltage Power drop PCL=5 VBAT PCL=5 Voltage ripple @ f<200kHz @ f>200kHz Power off mode Sleep mode (AT+CFUN=1): ( BS-PA-MFRMS=9 ) ( BS-PA-MFRMS=5) ( BS-PA-MFRMS=2) Idle mode (AT+CFUN=1): EGSM900 22.1...

  • Page 56: Electro-Static Discharge

    Smart Machine Smart Decision 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 43: The ESD characteristics (Temperature: 25° C, Humidity: 45 %) Pin name Contact discharge Air discharge...

  • Page 57: Module Rf Receive Sensitivity

    Smart Machine Smart Decision Table 45: DCS 1800 and PCS 1900 conducted RF output power DCS1800,PCS1900 Tolerance (dB) for conditions Nominal output power (dBm) Normal Extreme ± 2 ± 2.5 ± 3 ± 4 ± 3 ± 4 ± 3 ±...

  • Page 58: Manufacturing

    Smart Machine Smart Decision 7. Manufacturing 7.1. Top and Bottom View of SIM800 Figure 50: Top and Bottom View of SIM800 7.2. Typical Solder Reflow Profile Figure 51: Typical Solder Reflow Profile “ ” Note: Please refer to Module secondary-SMT-UGD for more information about the module shipping and manufacturing.

  • Page 59: The Moisture Sensitivity Level

    Smart Machine Smart Decision 7.3. The 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 <30° C and relative humidity of <60% (RH). It is necessary to bake the module if the above conditions are not met: Table 48: Moisture classification level and floor life Level...

  • Page 60: Appendix

    Smart Machine Smart Decision 8. Appendix I. Related Documents Table 50: Related Documents Document name Remark SIM800 Series_AT Command Manual ITU-T Draft new Serial asynchronous automatic dialing and control recommendation V.25ter: Digital cellular telecommunications (Phase 2+); AT command set GSM 07.07: for GSM Mobile Equipment (ME) GSM 07.10: Support GSM 07.10 multiplexing protocol...

  • Page 61: Terms And Abbreviations

    Smart Machine Smart Decision II. Terms and Abbreviations Table 51: Terms and Abbreviations Abbreviation Description Analog-to-Digital Converter Adaptive Multi-Rate Bluetooth Coding Scheme Circuit Switched Data Clear to Send Data Terminal Equipment (typically computer, terminal, printer) Data Terminal Ready Discontinuous Transmission Enhanced Full Rate EGSM Enhanced GSM...
  • Page 62 Smart Machine Smart Decision Transmit Direction UART Universal Asynchronous Receiver & Transmitter Unsolicited Result Code USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave Ratio Phonebook abbreviations SIM fix dialing phonebook SIM last dialing phonebook (list of numbers most recently dialed) Mobile Equipment list of unanswered MT calls (missed calls) SIM (or ME) own numbers (MSISDNs) list Mobile Equipment list of received calls...

  • Page 63: Safety Caution

    Smart Machine Smart Decision III. Safety Caution Table 52: 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.
  • Page 64 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.simcomm2m.com SIM800_Hardware Design_V1.09 2016-06-30...

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