SimCom SIM800L Hardware Design
  1. Manuals
  2. Brands
  3. SimCom Manuals
  4. Recording Equipment
  5. SIM800L
  6. Hardware design

SimCom SIM800L Hardware Design

Hide thumbs
Table of Contents

Advertisement

Quick Links

SIM800L （MT6261） _Hardware Design_V1.01

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the SIM800L and is the answer not in the manual?

Questions and answers

Related Manuals for SimCom SIM800L

Summary of Contents for SimCom SIM800L

  • Page 1 SIM800L （MT6261） _Hardware Design_V1.01...
  • Page 2 SIM800L(MT6261)_Hardware Design_V1.01 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 ......................26 4.3.2. Sleep Mode 1 (AT+CSCLK=1) ......................26 4.3.3. Wake Up SIM800L from Sleep Mode 1 ..................... 26 4.3.4. Sleep Mode 2 (AT+CSCLK=2) ......................26 4.3.5. Wake Up SIM800L from Sleep Mode 2 ..................... 27 4.4.
  • Page 4 VRTC Characteristics ......................54 Current Consumption (VBAT=3.8V) ................. 54 Electro-Static Discharge...................... 55 6.10 Radio Characteristics ......................56 6.10.1. Module RF Output Power ........................ 56 6.10.2. Module RF Receive Sensitivity ....................... 57 6.10.3. Module Operating Frequencies ......................57 SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...
  • Page 5 Smart Machine Smart Decision Manufacturing ....................58 7.1. Top and Bottom View of SIM800L ..................58 7.2. Typical Solder Reflow Profile .................... 58 7.3. The Moisture Sensitivity Level ................... 59 7.4. Baking Requirements ......................59 Appendix ......................60 Related Documents ......................60 Terms and Abbreviations ....................
  • Page 6 Smart Machine Smart Decision Table Index TABLE 1: MODULE INFORMATION ........................... 11 TABLE 2: SIM800L KEY FEATURES ..........................11 TABLE 3: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ......13 TABLE 4: OVERVIEW OF OPERATING MODES ......................13 TABLE 5: PIN DESCRIPTION ............................
  • Page 7 TABLE 48: OPERATING FREQUENCIES ........................57 TABLE 49: MOISTURE SENSITIVITY LEVEL AND FLOOR LIFE ................59 TABLE 50: BAKING REQUIREMENTS ........................59 TABLE 51: RELATED DOCUMENTS ........................... 60 TABLE 52: TERMS AND ABBREVIATIONS ........................ 61 TABLE 53: SAFETY CAUTION ............................. 63 SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...
  • Page 8 FIGURE 11: POWERED ON/OFF MODULE USING BUTTON .................. 22 FIGURE 12: TIMING OF POWER ON MODULE ......................23 FIGURE 13: TIMING OF POWER DOWN SIM800L BY PWRKEY ................23 FIGURE 14: TIMING OF RESTART SIM800L ......................24 FIGURE 15: RESET CIRCUIT ............................25 FIGURE 16: RESET TIMING SEQUENCE ........................
  • Page 9 FIGURE 49: GND PIN OF THE EARPHONE USE TO BE THE FM ANTENNA INTERFACE........49 FIGURE 50: PIN ASSIGNMENT ............................ 50 FIGURE 51: RECOMMENDED PCB LAYOUT ......................52 FIGURE 52: TOP AND BOTTOM VIEW OF SIM800L ....................58 FIGURE 53: TYPICAL SOLDER REFLOW PROFILE OF LEAD-FREE PROCESSES ..........58 SIM800L(MT6261)_Hardware Design_V1.01...

  • Page 10: Version History

    Add note of the over-temperature or under-temperature power down Add note of the ADC function Update Figure 47,Figure 48 Add Table 42 Ajuan.zhu Delete the multiplexing function Update Figure 4 Delete 4.2.2.4 Over-Temperature or Under-Temperature Power Down SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 11: Introduction

    A SIM card interface  Support FM  Support one PWM  SIM800L is designed with power saving technique so that the current consumption is as low as 1.11mA in sleep mode. 2.1. SIM800L Table 1: Module information SIM800L 850,900,1800 and 1900MHz...
  • Page 12 Smart Machine Smart Decision Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. SIM800L can  search the 4 frequency bands automatically. The frequency bands can also be Frequency bands set by AT command “AT+CBAND”. For details, please refer to document [1].

  • Page 13: Operating Mode

    CS-4 21.4kbps 42.8kbps 85.6kbps 2.3. Operating Mode The table below summarizes the various operating modes of SIM800L. 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 is no on air and no hardware interrupt (such as GSM/GPRS GPIO interrupt or data on serial port).

  • Page 14: Functional Diagram

    Smart Machine Smart Decision 2.4. Functional Diagram The following figure shows a functional diagram of SIM800L: GSM baseband  GSM RF  Antenna interface  Other interface  Power Radio Supply Power management unit Frequency Digital Interface Analog Interface GPIOs...

  • Page 15: Package Information

    Figure 2: Pin assignment (Top view) 3.2. Pin Description Table 5: Pin description Pin name Pin number Description Comment Power supply VBAT 1,42 Power supply It is recommended to VRTC Power supply for RTC connect with a battery or a SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...
  • Page 16 If these pins are unused, KBC0 keep open.（Please make Support up to 50 buttons (5*5*2) sure pin20 at high level KBR4 when power on） KBR3 KBR2 KBR1 KBR0 GPIO GPIO1 Programmable general purpose input GPIO2 and output GPIO3 SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...
  • Page 17 Antenna interface GSM_ANT Connect GSM antenna FM_ANT Antenna for FM Synchronizing signal of RF RF_SYNC Synchronizing signal of RF Other RESET Reset input(Active low) ISINK1 Drive keypad backlight ISINK0 Drive LCD backlight 36、57 Unconnected KEEP OPEN SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 18: Package Dimensions

    Smart Machine Smart Decision 3.3. Package Dimensions Figure 3: Dimensions of SIM800L (Unit: mm) SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 19: Figure 4: Recommended Pcb Footprint Outline (Unit: Mm)

    Smart Machine Smart Decision Figure 4: Recommended PCB footprint outline (Unit: mm) SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 20: 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 SIM800L VBAT pins. VBAT 33pF 10pF 5.1V...

  • Page 21: 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 SIM800L 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: Monitoring Power Supply

    Power on SIM800L Customer can power on SIM800L by pulling down the PWRKEY pin for more than 1 second at least and 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: Power Down Sim800L

    Undefined Figure 12: Timing of power on module When power on procedure is completed, SIM800L 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: Reset Function

    The figure 14 is based on that the powerkey pin is pulled down from 1.5s to 2s. The status should keep low more than ： 800ms before next restart. 4.2.3. Reset Function SIM800L also has a RESET pin (pin 49) used to reset the module. This function is used as an emergency reset SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 25: Power Saving Mode

    SIM800L has two power saving modes: Minimum functionality mode and sleep mode. AT command “AT+CSCLK=1”can be used to set SIM800L into sleep mode. AT command “AT+CFUN=<fun>“ can be used to set SIM800L into minimum functionality. When SIM800L is in sleep mode and minimum functionality mode, the current of module is lowest.

  • Page 26: Minimum Functionality Mode

    Sleep Mode 2 (AT+CSCLK=2) In this mode, SIM800L 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), SIM800L will enter sleep mode 2 automatically.

  • Page 27: Wake Up Sim800L From Sleep Mode 2

    Smart Machine Smart Decision 4.3.5. Wake Up SIM800L from Sleep Mode 2 When SIM800L is in sleep mode 2 (AT+CSCLK=2), the following methods can wake up the module: Send data to SIM800L via main serial port (the first character will lose). ...

  • Page 28: Serial Port And Usb Interface

    4.5. Serial Port and USB Interface SIM800L 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 9: Serial port and USB pin definition...

  • Page 29: Serial Interfaces

    Smart Machine Smart Decision The default setting is autobauding.  Autobauding allows SIM800L 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" or "at" or "aT" or "At"...

  • Page 30: Figure 21: Resistor Matching Circuit

    Note: please make sure the minimum of client high limit should be less than 2.8V minus the diode drop. If the voltage of UART is 5V, the following reference circuits are recommended: VDD_EXT Module 4.7K VDD_EXT 4.7K Figure 23: TX level matching circuit SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 31: Debug Interface

    4.5.3 Debug Interface SIM800L could achieve software debug function through USB interface. When powering on the module, connect 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 32: Software Upgrade

    If upgrading through USB interface, it is necessary to power on SIM800L first, then connect VBUS, USB_DP, USB_DN, and GND to PC. There is no need to operate PWRKEY pin in the whole procedure, when SIM800L detects VBUS and could communicate normally with USB_DP and USB_DN, it will enter USB download mode automatically.

  • Page 33: Audio Interfaces

    Figure 29: RI behaviour as a caller 4.7. Audio Interfaces SIM800L provides two analog inputs (MIC1P/1N; MIC2P/2N), which could be used for electret microphone. The module also provides two analog outputs (SPK1P/1N; SPK2P/2N). Table 13: Audio interface definition...

  • Page 34: Speaker Interfaces Configuration

    Secondary SPK2P Secondary Audio output positive SPK2N Secondary Audio output negative SPK1P/1N output can directly drive 32Ω receiver, SIM800L internal has class-AB audio amplifier, the following table is class-AB performance: Table 14: Performance of audio amplifier Conditions Class-AB AMP 4.2V 8Ω THD+N=1% 0.87W...

  • Page 35: Microphone Interfaces Configuration

    RF cable, antenna and VBAT pin. The bypass capacitor for filtering should be placed near module and another group needs to be placed near to connector. Conducting noise is mainly caused by the VBAT drop. If audio PA was powered by VBAT directly, then there SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 36: Sim Card Interface

    For details of this AT command, please refer to document [1]. If the SIM card detection function is not used, customer can keep the SIM_DET pin open. The reference circuit of 6-pin SIM card holder is illustrated in the following figure. SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 37: 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. SIM800L(MT6261)_Hardware Design_V1.01...

  • Page 38: Table 18: Pin Description (Molex Sim Card Holder)

    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. SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 39: Pcm Interface

    SIM card data I/O Note: Every time plug SIM card interval advice is greater than 2s. Otherwise may not be able to correct detection. 4.9. PCM Interface SIM800L provides a hardware PCM interface: Table 20: PCM pin definition Pin name...

  • Page 40: Pcm Interface

    PCM_OUT PCM data output PCM_SYNC PCM synchrony PCM_IN PCM data input SIM800L PCM interface only supply master mode, data length is 16 bits (linear)，PCM clock rate is 256KHz. Table 21: PCM specification Parameter Specification Line Interface Format Linear(Fixed) Data length...

  • Page 41: Figure 37: 25 Keys Reference Circuit

    KBR4 Figure 38: 50 keys reference circuit Note Do not change the 20KΩ resistor in the diagram. ： Customer could cascade a less than 1K resistor to enhance the ESD performance, the connection diagram is as following: SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 42: I2C Bus

    Note: Please be sure to increase the ESD protection devices in product design phase, and make sure have ESD protection devices in the final product. 4.11. I2C Bus The SIM800L provides an I2C interface which is only used in the embedded AT application. SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 43: General Purpose Input/Output (Gpio)

    4.12. General Purpose Input/Output (GPIO) SIM800L provides 3 GPIO pins. The output voltage level of the GPIO can be set by AT command “AT+SGPIO”. The input voltage level of the GPIO can also be read by AT command “AT+SGPIO”. For more details, please refer to document [1].

  • Page 44: Pwm

    Description PWM signal SIM800L provides a PWM which can be used to drive a vibrator, and a backlight LED for display or keyboard. PWM output frequency varies from 200Hz to 100KHz. Two 7-bit unsigned binary parameters are used for the output period and for the duty cycle.

  • Page 45: Network Status Indication

    Table 30: Status of the NETLIGHT pin Status SIM800L behavior SIM800L is not running 64ms On/ 800ms Off SIM800L not registered the network 64ms On/ 3000ms Off SIM800L registered to the network 64ms On/ 300ms Off GPRS communication is established...

  • Page 46: Led Interface

    Operating status indication Note: For timing about STATUS, please reference to the chapter “4.2 power on/down scenarios” 4.17. LED Interface SIM800L provides two LED driver pin. The two pin are open-drain output. Table 32: Pin definition of the LED Pin name...

  • Page 47: Antenna Interface

    4.19.1. GSM Antenna Interface There is a GSM antenna pad named GSM_ANT for SIM800L, 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.

  • Page 48: Fm Antenna Interface

    The module provides 1 FM antenna pad named FM_ANT . The FM antenna interface circuit is recommended as following: Antenna R304 R303 FM_ANT C303 C304 Moudle Figure 48: FM antenna matching circuit Normally, R303\R304 are 0Ω, C303\C304 are not mounted. SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 49: Figure 49: Gnd Pin Of The Earphone Use To Be The Fm Antenna Interface

    The earphone is often used for FM antenna, as an example, the pin GND of the 3.5mm earphone is connected to the FM interface. The circuit is recommended as following: R303 FM_ANT C303 C304 Moudle Figure 49: GND pin of the earphone use to be the FM antenna interface Normally, R303 are 0Ω,C303\C304 are not mounted. SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 50: Pcb Layout

    Following figure is the overview of pin assignment of the module. UART Antenna VBAT USB_DP VBUS Audio antenna Figure 50: Pin assignment Principle of PCB Layout During layout, attention should be paid to the following interfaces, like Antenna, power supply, SIM card SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 51: Antenna Interface

    The audio signal should avoid to parallel with VBAT trace.  5.2.5 Others It is better to trace signal lines of UART bunched, as well as signals of USB. Recommended PCB Layout Based on above principles, recommended layout is shown in the following illustration. SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 52: Figure 51: Recommended Pcb Layout

    Smart Machine Smart Decision Figure 51: Recommended PCB layout SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • 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 SIM800L. Table 36: Absolute maximum ratings Symbol...

  • Page 54: Sim_Vdd Characteristics

    VRTC Characteristics Table 42: VRTC characteristics Symbol Description Unit VRTC input voltage RTC-IN VRTC input current RTC-IN VRTC output voltage RTC-OUT VRTC output current RTC-OUT Current Consumption (VBAT=3.8V) Table 43: Current consumption Symbol Parameter Conditions Unit VBAT Voltage SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 55: Electro-Static Discharge

    Electro-Static Discharge SIM800L 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. Table 44: The ESD characteristics (Temperature: 25℃, Humidity: 45 %)

  • Page 56: Radio Characteristics

    ±5 ±6 ±5 ±6 ±5 ±6 19-31 ±5 ±6 Table 46: DCS1800 and PCS1900 conducted RF output power DCS1800,PCS1900 Tolerance (dB) for conditions Nominal output power (dBm) Normal Extreme ±2 ±2.5 ±3 ±4 ±3 ±4 ±3 ±4 SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 57: Module Rf Receive Sensitivity

    Table 48: Operating frequencies Frequency Receive Transmit GSM850 869 ～ 894MHz 824 ～ 849MHz EGSM900 925 ～ 960MHz 880 ～ 915MHz DCS1800 1805 ～ 1880MHz 1710 ～ 1785MHz PCS1900 1930 ～ 1990MHz 1850 ～ 1910MHz SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 58: Manufacturing

    Smart Machine Smart Decision 7. Manufacturing 7.1. Top and Bottom View of SIM800L Figure 52: Top and bottom view of SIM800L 7.2. Typical Solder Reflow Profile Figure 53: Typical solder reflow profile of lead-free processes Note: Please refer to Module secondary-SMT-UGD for more information about the module shipping and 《...

  • Page 59: The Moisture Sensitivity Level

    Smart Machine Smart Decision 7.3. The Moisture Sensitivity Level The moisture sensitivity level of SIM800L module is 3. The modules should be mounted within 168 hours after unpacking in the environmental conditions of temperature <30 ℃ and rel at i v...

  • Page 60: Appendix

    Digital cellular telecommunications system (Phase 2)； Mobile [10] GSM 11.10 Station (MS) conformance specification； Part 1： Conformance specification [11] AN_Serial Port AN_Serial Port [12] Module secondary-SMT-UGD Module secondary SMT User Guide AN_SMT [13] Module_RF_Reference Design_Guide SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 61: Terms And Abbreviations

    Point-to-point protocol Radio Frequency Root Mean Square (value) Real Time Clock Receive Direction Subscriber Identification Module Short Message Service Terminal Equipment, also referred to as DTE Transmit Direction UART Universal Asynchronous Receiver & Transmitter Unsolicited Result Code SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...
  • Page 62 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 SIM phonebook Not connect SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

  • Page 63: Safety Caution

    (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. SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...
  • Page 64 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: 86-21-32523300 Fax: 86-21-32523020 Email: simcom@sim.com Website: www.simcomm2m.com SIM800L(MT6261)_Hardware Design_V1.01 2016-07-07...

Table of Contents

Save PDF