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SIM Tech SIMCom SIM800C Hardware Design

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  • Page 1 SIM800C_Hardware_Design_V1.00...
  • Page 2 Smart Machine Smart Decision Document Title SIM800C Hardware Design Version V1.00 Date 2014-10-30 Status Draft Document Control ID SIM800C_Hardware_Design_V1.00 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 Version History ......................8 Introduction ......................9 SIM800C Overview ..................... 9 2.1. SIM800C ..........................9 2.2. SIM800C Key Features ......................9 2.3. Operating Mode ........................11 2.4. Functional Diagram......................11 Package Information ..................13 3.1. Pin Out Diagram .........................
  • Page 4 Smart Machine Smart Decision 4.8.2. SIM Card Design Guide ........................34 4.8.3. Design Considerations for SIM Card Holder ..................35 4.9. ADC ............................ 36 4.10. Network Status Indication ....................37 4.10.1. NETLIGHT Multiplexing Function ....................38 4.11. Operating Status Indication ....................38 4.11.1.
  • Page 5 Smart Machine Smart Decision Safety Caution ........................53 SIM800C_Hardware_Design_V1.00 2014-10-30...
  • 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 ......10 TABLE 4: OVERVIEW OF OPERATING MODES ......................11 TABLE 5: PIN DESCRIPTION ............................
  • Page 7 Smart Machine Smart Decision Figure Index FIGURE 1: SIM800C FUNCTIONAL DIAGRAM ......................12 FIGURE 2: PIN ASSIGNMENT (TOP VIEW) ........................ 13 FIGURE 3: DIMENSIONS OF SIM800C (UNIT: MM) ....................15 FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE (UNIT: MM) ..............16 FIGURE 5: REFERENCE CIRCUIT OF THE VBAT INPUT..................

  • Page 8: Version History

    Smart Machine Smart Decision Version History Date Version Description of change Author 2014-10-30 1.00 Origin Yanwu.wang; Xiaobo.bai SIM800C_Hardware_Design_V1.00 2014-10-30...

  • Page 9: Introduction

    Smart Machine Smart Decision 1. Introduction This document describes SIM800C hardware interface in great detail. The document can help customer to quickly understand SIM800C interface specifications, electrical and mechanical details. With the help of this document and other SIM800C application notes, customer guide, customers can use SIM800C to design various applications quickly.
  • Page 10 Smart Machine Smart Decision  Compliant to GSM Phase 2/2+  Class 4 (2W) at GSM 850 and EGSM 900 Transmitting power  Class 1 (1W) at DCS 1800 and PCS 1900  GPRS multi-slot class 12（default） GPRS connectivity  GPRS multi-slot class 1~12 (option) ...

  • Page 11: Operating Mode

    Smart Machine Smart Decision 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 2.3. Operating Mode The table below summarizes the various operating modes of SIM800C. Table 4: Overview of operating modes Mode Function...
  • Page 12 Smart Machine Smart Decision  Antenna interface  Other interface Power Radio Supply Power management unit Frequency Digital Interface Analog Interface UART Audio Analog base Digital base band band GPIO Figure 1: SIM800C functional diagram SIM800C_Hardware_Design_V1.00 2014-10-30...

  • Page 13: Package Information

    Smart Machine Smart Decision 3. Package Information 3.1. Pin Out Diagram STATUS NETLIGHT VDD_EXT PWRKEY VBAT VBAT UART1_TXD GSM_ANT UART1_RXD UART1_RTS UART1_CTS UART1_DCD RF_SYNC SIM800C VRTC UART1_DTR UART1_DTR TOP VIEW UART1_RI USB_DM MICP USB_DP MICN USB_VBUS SPKP UART2_RXD SPKN UART2_TXD SIM_DET SIM_DATA SIM_CLK...

  • Page 14: Pin Description

    Smart Machine Smart Decision 3.2. Pin Description Table 5: Pin description Pin name Pin number Description Comment Power supply VBAT 34,35 Power supply 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...

  • Page 15: Package Dimensions

    Smart Machine Smart Decision SIM_DATA SIM data input/output ESD with a TVS diode array. SIM_CLK SIM clock SIM_RST SIM reset If these pins are unused, SIM_DET SIM card detection keep open. Antenna interface GSM_ANT Connect GSM antenna BT_ANT Connect Bluetooth antenna Option, require sw supports Synchronizing signal of RF RF_SYNC...
  • Page 16 Smart Machine Smart Decision Figure 4: Recommended PCB footprint outline (Unit: mm) SIM800C_Hardware_Design_V1.00 2014-10-30...

  • Page 17: Application Interface

    Smart Machine Smart Decision 4. Application Interface 4.1. Power Supply The power supply range of SIM800C 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 100 µF is strongly recommended.

  • Page 18: 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 especially with the 2A peak current in burst mode of the module. The following figure is the reference circuit.

  • Page 19: Monitoring Power Supply

    Smart Machine Smart Decision VBAT MIN:3.0V Figure 9: The minimal VBAT voltage requirement at VBAT drop Note: Hardware power down voltage is 3.0V. 4.1.2. Monitoring Power Supply AT command “AT+CBC” can be used to monitor the VBAT voltage. For detail, please refer to document [1]. 4.2.

  • Page 20: Power Down Sim800C

    Smart Machine Smart Decision T>1.4s VBAT t>1s <0.7V PWRKEY (INPUT) 1.2s VDD_EXT t>3s STATUS Serial port Active Undefind Figure 12: Timing of power on module When power on procedure is completed, SIM800C will send following URC to indicate that the module is ready to operate at fixed baud rate.
  • Page 21 Smart Machine Smart Decision 1s<t<33s PWRKEY (INPUT) <0.7V VDD_EXT t>1.6s STATUS Serial port Active Undefined Figure 13: Timing of power down SIM800C by PWRKEY 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

    Smart Machine Smart Decision The module will constantly monitor the temperature of the module, If the temperature ≥ +80℃, the following URC will be reported: +CMTE: 1 If the temperature ≤ -30℃, the following URC will be reported: +CMTE:-1 If the temperature > +85℃, the following URC will be reported, and the module will be automatically powered down.

  • Page 23: Sleep Mode 1 (At+Csclk=1)

    Smart Machine Smart Decision  AT+CFUN=4： Flight mode (disable RF function). Table 7: The current consumption of Minimum Functionality Mode (BS-PA-MFRMS=9) <fun> Current consumption(mA) (sleep mode) Minimum functionality mode minimizes the current consumption to the lowest level. If SIM800C is set to minimum functionality by “AT+CFUN=0”, the RF function and SIM card function will be disabled.

  • Page 24: Power Saving Mode

    Smart Machine Smart Decision Note: Autobauding is default. It cannot enter sleep mode in the absence of synchronous serial port baud rate after module power on. 4.4. Power Saving Mode Current input for RTC when the VBAT is not supplied for the system. Current output for backup battery when the VBAT power supply is in present and the backup battery is in low voltage state.

  • Page 25: Serial Port And Usb Interface

    Smart Machine Smart Decision 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). Table 8: Serial port and USB pin definition Pin name Pin number Function UART1_DTR...

  • Page 26: Serial Interfaces

    Smart Machine Smart Decision  Serial port can be used for CSD,GPRS service and AT communication. It can also be used for multiplexing function. For details about multiplexing function, please refer to table 11.  Serial port supports the following baud rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600,115200,230400 and 460800bps ...
  • Page 27 Smart Machine Smart Decision UART1_TXD UART1_RXD UART1_RTS UART1_CTS UART1_DTR GPIO UART1_DCD GPIO UART1_RI EINT 5.6K 5.6K 5.6K Module (3.3V) Figure 19: Resistor matching circuit If the voltage of UART is 3V or3.3V, the following reference circuits are recommended: VDD_EXT UART1_RXD UART1_TXD Module Figure 20 : Diode isolation circuit...

  • Page 28: Debug Interface

    Smart Machine Smart Decision VDD_EXT Module VDD_EXT 4.7K 4.7K UART1_RXD Figure 22: RX level matching circuit 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 29: Software Upgrade

    Smart Machine Smart Decision 4.5.4 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 30 Smart Machine Smart Decision changed to high. The pin is changed to low, and kept low for 120ms when some URCs are reported. Then it is changed to high. For more details, please refer to document [10]. The behavior of the RI pin is shown in the following figure when the module is used as a receiver. HIGH Establish the call Hang up the call...

  • Page 31: Audio Interfaces

    Smart Machine Smart Decision Figure 28: 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 Pin name Pin number Function...

  • Page 32: Microphone Interfaces Configuration

    Smart Machine Smart Decision Close to speaker 33pF 10pF 33pF 10pF SPKP 33pF 10pF 33pF 10pF SPKN 33pF 10pF 33pF 10pF Module Figure 29: Speaker reference circuit 4.7.2. Microphone Interfaces Configuration These components should be placed to microphone as close as possible 33pF 10pF MICP...

  • Page 33: Tdd

    Smart Machine Smart Decision Table 15: Audio output characteristics Parameter Conditions Unit =32 Ω receiver Normal output =8 Ω speaker 1080 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.

  • Page 34: Sim Card Design Guide

    Smart Machine Smart Decision 4.7K VDD_EXT MOLEX-91228 SIM_VDD SIM_RST SIM_CLK Module SIM_DET PRESENCE SIM_DATA SIM Card 100nF 22pF SMF05C Figure 31: Reference circuit of the 8-pin SIM card holder The SIM_DET pin is used for detection of the SIM card hot plug in. Customer can select the 8-pin SIM card holder to implement SIM card detection function.

  • Page 35: Design Considerations For Sim Card Holder

    Smart Machine Smart Decision 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. Figure 33: Molex 91228 SIM card holder Table 17: Pin description (Molex SIM card holder) Pin name Signal Description...

  • Page 36: Adc

    Smart Machine Smart Decision Figure 34: Amphenol C707 10M006 512 SIM card holder Table 18: 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 37: Network Status Indication

    Smart Machine Smart Decision “AT+CADC” to read the voltage value. For details of this AT command, please refer to document [1]. Table 20: ADC specification Parameter Unit Voltage range ADC Resolution bits Sampling rate 1.0833 ADC precision 4.10. Network Status Indication Table 21: Pin definition of the NETLIGHT Pin name Pin number...

  • Page 38: Netlight Multiplexing Function

    Smart Machine Smart Decision 4.10.1. NETLIGHT Multiplexing Function Table 23: NETLIGHT multiplexing function Pin name Pin number Mode 0(default) Mode 1 NETLIGHT NETLIGHT GPIO Note: Multiplexing function need different software supply. 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 down.

  • Page 39: Rf_Sync Multiplexing Function

    Smart Machine Smart Decision Figure 36: RF_SYNC signal during transmit burst 4.12.1. RF_SYNC Multiplexing Function RF_SYNC can also be used as GPIO to indicate the RF Jamming. The RF_SYNC function and RF Jamming Detection function can be switched by AT+SJDR command. Table 27: RF_SYNC Multiplexing function Pin name Pin number...
  • Page 40 Smart Machine Smart Decision (Pin31) Module Antenna R101 GSM_ANT C101 C102 (Pin33) Figure 38: GSM antenna matching circuit without RF connector Normally R101 is 0Ω, C101 and C102 are not mounted.  SIM800C_Hardware_Design_V1.00 2014-10-30...

  • Page 41: Pcb Layout

    Smart Machine Smart Decision 5. PCB Layout This section will give some guidelines on PCB layout, in order to eliminate interfere or noise. Pin Assignment Before PCB layout, we should learn about pin assignment in order to get reasonable layout with so many external components.

  • Page 42: 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 43: 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 SIM800C. Table 28: Absolute maximum ratings Symbol Unit VBAT...

  • Page 44: 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 32: SIM_VDD characteristics Symbol Parameter Unit Output voltage Output voltage VDD_EXT Characteristics Table 33: VDD_EXT characteristics Symbol Parameter Unit Output voltage Output current...

  • Page 45: Electro-Static Discharge

    Smart Machine Smart Decision @ f>200kHz Power down mode Sleep mode (AT+CFUN=1)： ( BS-PA-MFRMS=9 ) 0.98 ( BS-PA-MFRMS=5) 1.12 ( BS-PA-MFRMS=2) 1.25 Idle mode (AT+CFUN=1)： GSM850 13.8 EGSM900 13.8 DCS1800 13.8 PCS1900 13.8 Voice call (PCL=5)： GSM850 EGSM900 Voice call (PCL=0)： DCS1800 Average currnet PCS1900...

  • Page 46: Radio Characteristics

    Smart Machine Smart Decision ±6KV ±12KV UARTX_RXD, UARTX_TXD ±2KV ±8KV Antenna port ±5KV ±10KV SPKP/SPKN/MICP/MICN ±2KV ±5KV PWRKEY ±2KV ±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 47: 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 39: Conducted RF receive sensitivity Frequency Receive sensitivity（Typical）...

  • Page 48: 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_V1.00 2014-10-30...

  • Page 49: 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 necessary to bake the module if the above conditions are not met: Table 41: Moisture sensitivity level and floor life Moisture Sensitivity Level...

  • Page 50: Appendix

    Smart Machine Smart Decision 8. Appendix I. Related Documents Table 43: Related documents Document name Remark SIM800 Series AT Command Manual SIM800 Series UART Port Application Note_V1 01.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 51: Multiplexing Function

    Smart Machine Smart Decision II. Multiplexing Function Table 44: Multiplexing function Pin name Reset Mode Mode 1 Mode 2 Mode 3 number 0(default) 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 UART1_RI...
  • Page 52 Smart Machine Smart Decision Password Authentication Protocol 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...
  • Page 53 Smart Machine Smart Decision IV. Safety Caution Table 46: 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 54 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_V1.00 2014-10-30...

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