SimCom SIM800 Hardware Design
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SimCom SIM800 Hardware Design

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Summary of Contents for SimCom SIM800

  • Page 1 SIM800_Hardware Design_V1.10...
  • Page 2 SIM800_Hardware Design_V1.10 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.

  • Page 3: Table Of Contents

    Power Saving Mode..........................26 4.3.1. Function Mode ............................ 26 4.3.2. Sleep Mode (AT+CSCLK=1) ......................27 4.3.3. Wake Up SIM800 from Sleep Mode (AT+CSCLK=1) ..............27 4.4. RTC Backup ............................27 4.5. Serial Port and USB Interface......................... 28 4.5.1 Function of Serial Port ........................29 4.5.2...
  • Page 4 6.11 Module RF Receive Sensitivity ......................57 6.12 Module Operating Frequencies....................... 57 Manufacturing ............................. 59 7.1. Top and Bottom View of SIM800 ......................59 7.2. Typical Solder Reflow Profile ........................ 59 7.3. The Moisture Sensitivity Level ......................60 7.4. Baking Requirements ..........................60 Packaging ..............................
  • 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 45: DCS 1800 AND PCS 1900 CONDUCTED RF OUTPUT POWER ............. 57 TABLE 46: CONDUCTED RF RECEIVE SENSITIVITY ..................... 57 TABLE 47: OPERATING FREQUENCIES ........................58 TABLE 48: MOISTURE CLASSIFICATION LEVEL AND FLOOR LIFE ..............60 TABLE 49: BAKING REQUIREMENTS ........................
  • Page 7 FIGURE 11: POWER ON/OFF MODULE USING BUTTON ..................23 FIGURE 12: TIMING OF POWER ON MODULE ......................23 FIGURE 13: TIMING OF POWER OFF SIM800 BY PWRKEY ................... 24 FIGURE 14: RESET CIRCUIT ............................25 FIGURE 15: RESET TIMING SEQUENCE ........................26 FIGURE 16: RTC SUPPLY FROM CAPACITOR ......................
  • Page 8 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 ....................59 FIGURE 51: TYPICAL SOLDER REFLOW PROFILE ....................59 FIGURE 52: PACKAGING DIAGRAM .......................... 61 FIGURE 53: TRAY DRAWING ............................
  • Page 9 Update figure 32 and figure 33, The 100nF capacitor changed; Ma Honggang Update figure 12 and 13, timing of VDD_EXT changed; Update the baudrate that SIM800 supports; Rename some pin name to follow the SIMCom naming rules; 2014-07-18 1.06 Ma Honggang Uptade table 6, table9;...

  • Page 10: 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  Coding scheme: CS-1, CS-2, CS-3 and CS-4 GPRS ...

  • Page 12: Operating Modes

    CS-4 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 Function Module will automatically go into sleep mode if the conditions of sleep mode are enabling and there is no on air or hardware interrupt (such as GSM/GPRS GPIO interrupt or data on serial port).

  • 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...

  • 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_V1.10 2018-08-13...

  • 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...
  • 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_V1.10 2018-08-13...

  • Page 18: Package Dimensions

    Smart Machine Smart Decision 3.3. Package Dimensions Figure 3: Dimensions of SIM800 (Unit: mm) SIM800_Hardware Design_V1.10 2018-08-13...
  • 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_V1.10 2018-08-13...

  • Page 20: Application Interface

    .The 33pF and 10pF capacitors can effectively eliminate the high frequency interference. A 5.1V/500mW Zener diode is strongly recommended, the diode can prevent chip from damaging by the voltage surge. These capacitors and Zener diode should be placed as close to SIM800 VBAT pins as possible.
  • Page 21 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.

  • Page 22: Power Supply Pin

    Power on SIM800 User can power on SIM800 by pulling down the PWRKEY pin at least 1.2 second and then release. This pin is already pulled up to VBAT in the module internal, so external pull up is not necessary. Reference circuit is shown as below.
  • Page 23 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. This URC does not appear when autobauding function is active.

  • Page 24: Power Off Sim800

    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 1.5 second and then release. Please refer to the power on circuit. The power off sequence is illustrated in following figure.

  • Page 25: Reset Function

    Reset Function SIM800 also have a RESET pin used to reset the module. This function is used as an emergency reset only when AT command “AT+CPOWD=1” and the PWRKEY pin have no effect. User can pull the RESET pin to ground, and then the module will restart.

  • Page 26: 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. When SIM800 is in sleep mode and minimum function mode, the current of module is the lowest.

  • Page 27: Sleep Mode (At+Csclk=1)

    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), SIM800 will enter sleep mode automatically.

  • Page 28: Serial Port And Usb Interface

    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. The module is designed as a DCE (Data Communication Equipment). The following figure shows the connection between module and client (DTE).

  • Page 29: Function Of Serial Port

    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 “A”...
  • 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 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. RB551V-30TE-17 and SDM20U40. If the voltage of UART is 5V on customer side, customer can use the following reference circuits: VDD_EXT Module...

  • Page 32: Software Upgrade And Debug

    USB and UART interfaces can be used for firmware upgrade. If customer upgrading firmware via the USB port, SIM800 must be powered first, then connect USB_VBUS, USB_DP, USB_DN and GND 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.

  • 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

    Figure 29: RI behaviour as a caller 4.7. Audio Interfaces SIM800 provides one analog input, which could be used for electret microphone. The module also provides one analog output. The output can directly drive 32Ω receiver. Table 12: Audio interface definition...

  • 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: Audio Electronic Characteristic

    MIC and speaker over bypass capacitor. So, take care of GND well during PCB layout. 4.8. Bluetooth SIM800 supports Bluetooth function, customer only needs to design the Bluetooth antenna, and then customer can operate Bluetooth conveniently by AT commands. ...

  • Page 37: Sim Card Interface

    Smart Machine Smart Decision  Support sniff mode  Supports PCM interface and built-in programmable transcoders for liner voice with transmission 4.9. SIM Card Interface The SIM interface complies with the GSM Phase 1 specification and the new GSM Phase 2+ specification for FAST 64 kbps SIM card.

  • Page 38: Sim Card Design Consideration

    Add some TVS and the parasitic capacitance should not exceed 50pF, and 51Ω resistor in serials the SIM signal could enhance ESD protection. 4.9.3. Design Considerations for SIM Card Holder For 8 pins SIM card holder, SIMCom recommends to use Molex 91228.User can visit http://www.molex.com for more information about the holder. SIM800_Hardware Design_V1.10...
  • Page 39 Connect to GND Not connect SIM_DATA SIM card data I/O SIM_DET Detect SIM card presence For 6-pin SIM card holder, SIMCom recommends to use Amphenol C707 10M006 512 .User can visit http://www.amphenol.com for more information about the holder. SIM800_Hardware Design_V1.10 2018-08-13...

  • Page 40: Pcm Interface

    SIM card reset SIM_CLK SIM card clock Connect to GND Not connect SIM_DATA SIM card data I/O 4.10. PCM Interface SIM800 provides PCM interface. Table 18: PCM pin definition Pin name Pin number Description PCM_OUT PCM data output PCM_IN PCM data input...

  • 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...
  • 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

    I2C serial bus data(open drain output) Note: I2C has been pulled up to 2.8V via 4.7KΩ inside. 4.13. General Purpose Input/Output (GPIO) SIM800 provides 2 GPIO pins. The output voltage level of the GPIO can be set by the AT command “AT+ or “AT+CGPIO” SGPIO”...

  • Page 45: Adc

    PWM1 PWM1 Note: SIM800 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 200Hz – 100KHz.Two 7-bit unsigned binary parameters are used for the SIM800_Hardware Design_V1.10...

  • 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

    Pin name Pin number Description status indication STATUS Operating 4.18. KPLED SIM800 provides one open-drain LED driver pin. Table 31: Pin definition of the KPLED Pin name Pin number Description KPLED Sink current for keypad LED Reference circuit is recommended in the following figure: SIM800_Hardware Design_V1.10...

  • 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 There are two antenna ports for SIM800, GSM antenna port named GSM_ANT and Bluetooth antenna port 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.

  • Page 50: Bluetooth Antenna Interface

    Smart Machine Smart Decision Table 34: Recommendation of ESD component 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

    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...

  • 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 %)

  • Page 57: Module Rf Receive Sensitivity

    ±4 ±5 ±5 ±6 ±5 ±6 6.11 Module RF Receive Sensitivity The following table shows the SIM800 conducted receive sensitivity; it is tested under static condition. Table 46: Conducted RF receive sensitivity Frequency Receive sensitivity(Typical) Receive sensitivity(Max) GSM850,EGSM900 < -108dBm <...
  • Page 58 Smart Machine Smart Decision Table 47: Operating frequencies Frequency Receive Transmit Channel 869 ～ 894MHz 824 ～ 849MHz 128 ～ 251 GSM850 925 ～ 960MHz 880 ～ 915MHz 0 ～ 124 , 975 ～ 1023 EGSM900 1805 ～ 1880MHz 1710 ～ 1785MHz 512 ～...

  • Page 59: 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 60: The Moisture Sensitivity Level

    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...

  • Page 61: Packaging

    Smart Machine Smart Decision 8. Packaging Module support tray packaging. Figure 52: packaging diagram Module tray drawing： Figure 53: Tray drawing Table 50: Tray size Length（±3mm） Width（±3mm） Number 242.0 161.0 SIM800_Hardware Design_V1.10 2018-08-13...
  • Page 62 Smart Machine Smart Decision Small carton drawing： Figure 54: Small carton drawing Table 51: Small Carton size Length（±10mm） Width（±10mm） Height（±10mm） Number 20*20=400 Big carton drawing： Figure 55: Big carton drawing Table 52: Big Carton size Length（±10mm） Width（±10mm） Height（±10mm） Number 400*4=1600 SIM800_Hardware Design_V1.10 2018-08-13...

  • Page 63: Appendix

    Smart Machine Smart Decision 9. Appendix I. Related Documents Table 53: 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:...

  • Page 64: Terms And Abbreviations

    Smart Machine Smart Decision II. Terms and Abbreviations Table 54: 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 65 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 66: Safety Caution

    Smart Machine Smart Decision III. Safety Caution Table 55: 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 67 Smart Machine Smart Decision Contact us: Shanghai SIMCom Wireless Solutions Ltd. Address: Building B, No.633 Jinzhong Road, Changning District, Shanghai P.R.China 200335 Tel: +86 21 3157 5100\3157 5200 Email: simcom@simcom.com, simcom@sim.com Website: www.simcomm2m.com SIM800_Hardware Design_V1.10 2018-08-13...

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