SimCom SIM800C Hardware Design
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SimCom SIM800C Hardware Design

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Summary of Contents for SimCom SIM800C

  • Page 1 SIM800C_Hardware_Design_V1.02...
  • Page 2 Document Control ID 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

    4.3.1. Minimum Functionality Mode ......................22 4.3.2. Sleep Mode 1 (AT+CSCLK=1) ......................22 4.3.3. Wake Up SIM800C from Sleep Mode 1 ..................... 23 4.3.4. Sleep Mode 2 (AT+CSCLK=2) ......................23 4.3.5. Wake Up SIM800C from Sleep Mode 2 ..................... 23 4.4.
  • Page 4 Module RF Output Power........................ 44 6.10.2 Module RF Receive Sensitivity ....................... 45 6.10.3 Module Operating Frequencies......................45 Manufacturing ....................46 7.1. Top and Bottom View of SIM800C..................46 7.2. Typical Solder Reflow Profile ....................46 7.3. The Moisture Sensitivity Level...................47 7.4. Baking Requirements......................47 Appendix......................
  • Page 5 Smart Machine Smart Decision III. Terms and Abbreviations ....................49 Safety Caution........................51 SIM800C_Hardware_Design_V1.02 2015-4-27...
  • Page 6 Smart Machine Smart Decision Table Index TABLE 1: MODULE INFORMATION ..........................9 TABLE 2: SIM800C KEY FEATURES ..........................9 TABLE 3: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ......11 TABLE 4: OVERVIEW OF OPERATING MODES......................11 TABLE 5: PIN DESCRIPTION ............................
  • Page 7 FIGURE 11: POWERED ON/DOWN MODULE USING BUTTON ................19 FIGURE 12: TIMING OF POWER ON MODULE......................19 FIGURE 13: TIMING OF POWER OFF SIM800C BY PWRKEY ................20 FIGURE 14: TIMING OF RESTART SIM800C......................22 FIGURE 15: RTC SUPPLY FROM CAPACITOR......................23 FIGURE 16: RTC SUPPLY FROM NON-CHARGEABLE BATTERY .................

  • Page 8: Version History

    Smart Machine Smart Decision Version History Date Version Description of change Author Yanwu.wang; 2014-11-06 1.00 Origin Xiaobo.bai Update figure1,figure12,figure40 Delete figure26 Yanwu.wang; 2015-01-06 1.01 Add VRTC segment to table5 Xiaobo.bai Update table11,table34,table35,table36 Update figure7,figure10,figure11,figure10,figure12,figure13, Yanwu.wang; 2015-04-27 1.02 figure14,figure23,figure37,figure38 Xiaobo.bai Update table1,table2 SIM800C_Hardware_Design_V1.02 2015-4-27...

  • Page 9: Introduction

    Programmable general purpose input and output;  One SIM card interface;  Support Bluetooth (need software support). SIM800C is designed with power saving technique so that the current consumption is as low as 0.6mA in sleep mode. 2.1. SIM800C Table 1: Module information SIM800C...
  • Page 10 Smart Machine Smart Decision search the 4 frequency bands automatically. The frequency bands can also be set by AT command “AT+CBAND”. For details, please refer to document [1].  Compliant to GSM Phase 2/2+  Class 4 (2W) at GSM 850 and EGSM 900 Transmitting power ...

  • Page 11: Operating Mode

    CS-4 21.4kbps 42.8kbps 85.6kbps 2.3. Operating Mode The table below summarizes the various operating modes of SIM800C. Table 4: Overview of operating modes Mode Function Module will automatically go into sleep mode if the conditions of sleep mode are enabling and there aren’t on air and hardware interrupt (such as GSM/GPRS GPIO interrupt or data on serial port).

  • Page 12: Functional Diagram

    Smart Machine Smart Decision 2.4. Functional Diagram The following figure shows a functional diagram of SIM800C:  GSM baseband  GSM RF  Antenna interface  Other interface G S M P ow er Radio S uppl y P ow er m anagem ent uni t...

  • Page 13: Package Information

    Smart Machine Smart Decision 3. Package Information 3.1. Pin Out Diagram Figure 2: Pin out Diagram (Top view) 3.2. Pin Description Table 5: Pin description Pin name Pin number Description Comment Power supply VBAT 34,35 Power supply SIM800C_Hardware_Design_V1.02 2015-4-27...
  • Page 14 Smart Machine Smart Decision recommended VRTC Power supply for RTC connect with a battery or a capacitor (e.g. 4.7uF). If these pins are unused, VDD_EXT 2.8V power output keep open. 8,13,19,21,27,30, GND for VBAT recommend Ground 31,33,36,37 to use 36,37pin Power on/down PWRKEY should be pulled low at Internally...

  • Page 15: Package Dimensions

    Smart Machine Smart Decision keep open. Antenna interface GSM_ANT Connect GSM antenna BT_ANT Connect Bluetooth antenna Synchronizing signal of RF RF_SYNC Synchronizing signal of RF 3.3. Package Dimensions Figure 3: Dimensions of SIM800C (Unit: mm) SIM800C_Hardware_Design_V1.02 2015-4-27...
  • Page 16 Smart Machine Smart Decision Figure 4: Recommended PCB footprint outline (Unit: mm) SIM800C_Hardware_Design_V1.02 2015-4-27...

  • Page 17: Application Interface

    Increase 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 as possible to SIM800C VBAT pins.

  • Page 18: Power Supply Pin

    Figure 7: Reference circuit of the DC-DC power supply The single 3.7V Li-ion cell battery can be connected to SIM800C 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 19: Monitoring Power Supply

    Power on SIM800C Customer can power on SIM800C by pulling down the PWRKEY pin for at least 1 second and release. This pin is already pulled up to VBAT in the module internal, so external pull up is not necessary. Reference circuits are shown as below.

  • Page 20: Power Off Sim800C

    After the configuration is saved as fixed baud rate, the Code “RDY” should be received from the serial port every time when SIM800C is powered on. For details, please refer to the chapter “AT+IPR” in document [1].
  • Page 21 Smart Machine Smart Decision SIM800C can be powered off by AT command “AT+CPOWD=1”. This procedure makes the module log off from the network and allows the software to enter into a secure state to save data before completely shut down.

  • Page 22: Power Saving Mode

    Sleep Mode 1 (AT+CSCLK=1) Customer can control SIM800C 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), SIM800C will enter sleep mode automatically.

  • Page 23: Wake Up Sim800C From Sleep Mode 1

    Sleep Mode 2 (AT+CSCLK=2) In this mode, SIM800C will continuously monitor the serial port data signal. When there is no data transfer over 5 seconds on the RXD signal and there is no on air and hardware interrupts (such as GPIO interrupt), SIM800C will enter sleep mode 2 automatically.

  • Page 24: Serial Port And Usb Interface

    Note: When shut off VBAT and power on VRTC only, the clock error becomes larger. 4.5. Serial Port and USB Interface SIM800C default provides one unbalanced asynchronous serial ports. The module is designed as a DCE (Data Communication Equipment). The following figure shows the connection between module and client (DTE).

  • Page 25: Function Of Serial Port

     Autobauding supports the following baud rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200bps Autobauding allows SIM800C 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, it is recommended to send "AT"...
  • Page 26 Smart Machine Smart Decision M odul e(D C E ) C ust om er(D T E ) S eri al P ort S eri al P ort U A R T1_T X D T X D U A R T1_R X D R X D U A R T1_R T S R T S...

  • Page 27: Debug Interface

    4.5.3 Debug Interface SIM800C could achieve software debug function through USB interface. When powering on the module, connect USB_VBUS, USB_DP, USB_DN, and GND to PC, then install the driver following the prompts, a UART port could be recognized by PC, customer could achieve the software Debug with this UART port.

  • Page 28: Software Upgrade

    Customer could upgrade module’s firmware through USB or UART interface. If upgrading through USB interface, it is necessary to power on SIM800C first, and then connect USB_VBUS, USB_DP, USB_DN, and GND to PC. There is no need to operate PWRKEY pin in the whole procedure, when SIM800C detects USB_VBUS and could communicate normally with USB_DP and USB_DN, it will enter USB download mode automatically.

  • Page 29: Audio Interfaces

    Figure 27: UART1_RI behaviour as a caller 4.7. Audio Interfaces SIM800C provides an analog input (MICP; MICN), which could be used for electret microphone. The module also provides an analog output (SPKP; SPKN). Table 12: Audio interface definition...

  • Page 30: Speaker Interfaces Configuration

    Smart Machine Smart Decision 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 l ose t o speaker E S D 33pF 10pF...

  • Page 31: Tdd

    Smart Machine Smart Decision Input level:0dBm0 Table 14: Audio output characteristics Parameter Conditions Unit Normal output =32 Ω receiver 4.7.4. Audio signal could be interferenced by RF signal. Coupling noise could be filtered by adding 33pF and 10pF capacitor to audio lines. 33pF capacitor could eliminate noise from GSM850/EGSM900MHz, while 10pF capacitor could eliminate noise from DCS1800/PCS1900Mhz frequency.

  • Page 32: Sim Card Design Guide

     Add 51Ω resistor to (SIM_RST/SIM_CLK/SIM_DATA) signal could enhance ESD protection 4.8.3. Design Considerations for SIM Card Holder For 8 pins SIM card holder, SIMCom recommends to use Molex 91228.Customer can visit http://www.molex.com for more information about the holder. SIM800C_Hardware_Design_V1.02...
  • Page 33 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 .Customer can visit http://www.amphenol.com for more information about the holder. SIM800C_Hardware_Design_V1.02 2015-4-27...

  • Page 34: Adc

    Description Analog voltage input SIM800C provides an auxiliary ADC, which can be used to measure the voltage. Customer can use AT command “AT+CADC” to read the voltage value. For details of this AT command, please refer to document [1]. SIM800C_Hardware_Design_V1.02...

  • Page 35: 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 21: Status of the NETLIGHT pin Status SIM800C behavior Powered off 64ms On/ 800ms Off Not registered the network...

  • Page 36: Operating Status Indication

    Smart Machine Smart Decision 4.11. Operating Status Indication The pin42 is for operating status indication of the module. The pin output is high when module is powered on, and output is low when module is powered off. Table 23: Pin definition of the STATUS Pin name Pin number Description...

  • Page 37: Antenna Interface

    About the RF trace layout please refer to“AN_SMT Module_RF_Reference Design_Guide”. 4.13.1 GSM Antenna Interface SIM800C provides a GSM antenna named GSM_ANT, customer could use 50Ω microstrip line or stripline antenna connect to the module. It is recommended to reserve the matching circuit as following:...

  • Page 38: Bluetooth Antenna Interface

    Smart Machine Smart Decision Normally R101 is 0Ω, C101 and C102 are not mounted. 4.13.2 Bluetooth Antenna Interface It is recommended to reserve the matching circuit as following: G N D (P i n19) M odul e A nt enna B T _A N T R 201 (P i n20)

  • Page 39: Pcb Layout

    Following figure is the overview of pin assignment of the module. STATUS PWRKEY NETLIGHT VDD_EXT VBAT VBAT UART1_TXD GSM_ANT UART1_RXD VBAT UART1_RTS UART UART1_CTS AUDIO RF_SYNC UART1_DCD SIM800C VRTC UART1_DTR UART1_DTR SIM CART TOP VIEW UART1_RI USB_DM ANTANA MICP USB_DP MICN USB_VBUS OTHERS SPKP UART2_RXD SPKN...

  • Page 40: Antenna Interface

    Smart Machine Smart Decision 5.2.1 Antenna Interface  The length of trace between pin output and connector should be as short as possible;  Do not trace RF signal over across the board;  The RF signal should be far away from SIM card, power ICs. 5.2.2 Power Supply ...

  • Page 41: 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 SIM800C. Table 27: Absolute maximum ratings Symbol...

  • Page 42: Sim_Vdd Characteristics

    Smart Machine Smart Decision 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 31: SIM_VDD characteristics Symbol Parameter Unit Output voltage Output current VDD_EXT Characteristics Table 32: VDD_EXT characteristics Symbol Parameter Unit Output voltage Output current...

  • Page 43: Electro-Static Discharge

    Electro-Static Discharge SIM800C is an ESD sensitive component, so attention should be paid to the procedure of handling and packaging. The ESD test results are shown in the following table.

  • Page 44: Radio Characteristics

    Smart Machine Smart Decision ±6KV ±12KV UART1_TXD /UART1_RXD ±4KV ±8KV Antenna port ±5KV ±10KV SPKP/SPKN/MICP/MICN ±4KV ±8KV PWRKEY ±4KV ±8KV 6.10 Radio Characteristics 6.10.1 Module RF Output Power The following table shows the module conducted output power, it is followed by the 3GPP TS 05.05 technical specification requirement.

  • Page 45: Module Rf Receive Sensitivity

    Smart Machine Smart Decision ±3 ±4 ±3 ±4 ±3 ±4 ±3 ±4 ±3 ±4 ±4 ±5 ±4 ±5 ±4 ±5 ±4 ±5 ±4 ±5 ±5 ±6 ±5 ±6 6.10.2 Module RF Receive Sensitivity The following table shows the module’s conducted receiving sensitivity, it is tested under static condition. Table 38: Conducted RF receive sensitivity Frequency Receive sensitivity（Typical）...

  • Page 46: Manufacturing

    Smart Machine Smart Decision 7. Manufacturing 7.1. Top and Bottom View of SIM800C Figure 40: Top and bottom view of SIM800C 7.2. Typical Solder Reflow Profile Figure 41: Typical solder reflow profile of lead-free processes SIM800C_Hardware_Design_V1.02 2015-4-27...

  • Page 47: The Moisture Sensitivity Level

    Smart Machine Smart Decision 7.3. The Moisture Sensitivity Level The moisture sensitivity level of SIM800C module is 3. The modules should be mounted within 168 hours after unpacking in the environmental conditions of temperature <30℃ and relative humidity of <60% (RH). It is...

  • Page 48: Appendix

    Smart Machine Smart Decision 8. Appendix I. Related Documents Table 42: Related documents Document name Remark SIM800 Series AT Command Manual SIM800 Series UART Port Application Note_V1 02.doc ITU-T Draft Serial asynchronous automatic dialing and control recommendation V.25ter： Digital cellular telecommunications (Phase 2+); AT command set for GSM 07.07：...

  • Page 49: Multiplexing Function

    Smart Machine Smart Decision II. Multiplexing Function Table 43: Multiplexing function Pin name Reset Pin number Mode 0(default) Mode 1 Mode 2 Mode 3 STATUS I/PD STATUS GPIO19 SIM_DET I/PD SIM_DET GPIO20 EINT14 NETLIGHT I/PD NETLIGHT GPIO17 UTXD3 UART1_DTR I/PD UART1_DTR GPIO18 EINT13...
  • Page 50 Smart Machine Smart Decision PBCCH Packet Broadcast Control Channel Printed Circuit Board Power Control Level Personal Communication System, also referred to as GSM 1900 Protocol Data Unit Point-to-point protocol Radio Frequency Root Mean Square (value) Receive Direction Subscriber Identification Module Short Message Service Terminal Equipment, also referred to as DTE Transmit Direction...
  • Page 51 Smart Machine Smart Decision IV. Safety Caution Table 45: 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 52 Smart Machine Smart Decision Contact us: Shanghai SIMCom Wireless Solutions Co.,Ltd. Address: Building A, SIM Technology Building, No. 633, Jinzhong Road, Shanghai, P. R. China 200335 Tel: +86 21 3252 3300 Fax: +86 21 3252 3020 URL: www.sim.com/wm SIM800C_Hardware_Design_V1.02 2015-4-27...

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