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SIM Tech SIMCom SIM800H Hardware Design

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Summary of Contents for SIM Tech SIMCom SIM800H

  • Page 1 SIM800H_Hardware Design_V2.03...
  • Page 2 Smart Machine Smart Decision Document Title SIM800H_Hardware Design_V2.03 Version V2.03 Date 2016-10-10 Status Release Document Control ID SIM800H_Hardware Design_V2.03 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 Table Index ........................6 Figure Index ......................... 8 Version History ......................10 Introduction ......................11 SIM800H Overview ................... 11 2.1. SIM800H ..........................11 2.2. SIM800H Key Features ...................... 11 2.3. Operating Mode ........................13 2.4. Functional Diagram......................
  • Page 4 Smart Machine Smart Decision 4.7.1. Speaker Interfaces Configuration ......................34 4.7.2. Microphone Interfaces Configuration ....................35 4.7.3. Audio Electronic Characteristic ......................35 4.7.4. TDD ..............................35 4.8. SIM Card Interface......................36 4.8.1. SIM Card Application ......................... 36 4.8.2. SIM Card Design Guide ........................37 4.8.3.
  • Page 5 Smart Machine Smart Decision 6.10.3. Module Operating Frequencies ......................59 Manufacturing ....................60 7.1. Top and Bottom View of SIM800H ................... 60 7.2. Typical Solder Reflow Profile .................... 60 7.3. The Moisture Sensitivity Level ................... 61 7.4. Baking Requirements ......................61 Appendix ......................
  • Page 6 Smart Machine Smart Decision Table Index TABLE 1: MODULE INFORMATION ........................... 11 TABLE 2: SIM800H 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 Smart Machine Smart Decision TABLE 46: THE ESD CHARACTERISTICS (TEMPERATURE: 25℃, HUMIDITY: 45 %) ........58 TABLE 47: GSM850 AND EGSM900 CONDUCTED RF OUTPUT POWER .............. 58 TABLE 48: DCS1800 AND PCS1900 CONDUCTED RF OUTPUT POWER ............... 59 TABLE 49: CONDUCTED RF RECEIVE SENSITIVITY ..................... 59 TABLE 50: OPERATING FREQUENCIES ........................
  • Page 8 Smart Machine Smart Decision Figure Index FIGURE 1: SIM800H FUNCTIONAL DIAGRAM ......................14 FIGURE 2: PIN ASSIGNMENT (TOP VIEW) ........................ 15 FIGURE 3: DIMENSIONS OF SIM800H (UNIT: MM) ....................18 FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE (UNIT: MM) ..............19 FIGURE 5: REFERENCE CIRCUIT OF THE VBAT INPUT..................
  • Page 9 Smart Machine Smart Decision FIGURE 47: GSM SIMPLE ANTENNA MATCHING CIRCUIT .................. 48 FIGURE 48: BLUETOOTH ANTENNA MATCHING CIRCUIT .................. 48 FIGURE 49: FM ANTENNA MATCHING CIRCUIT ....................49 FIGURE 50: GND PIN OF THE EARPHONE USE TO BE THE FM ANTENNA INTERFACE........49 FIGURE 51: PIN ASSIGNMENT ............................

  • Page 10: Version History

    Smart Machine Smart Decision Version History Date Version Description of change Author 2013-08-01 1.00 Origin Jialin.song; Ya.li 2013-08-20 1.01 Update figure 15, figure 23, figure 32, figure 54 Update Bluetooth matching (R201 is 1.2nH, C202 is 1.5pF) Update 7.3 and 7.4 paragraph Jialin.song;...

  • Page 11: Introduction

    Smart Machine Smart Decision 1. Introduction This document describes SIM800H hardware interface in great detail. The document can help customer to quickly understand SIM800H interface specifications, electrical and mechanical details. With the help of this document and other SIM800H application notes, customer guide, customers can use SIM800H to design various applications quickly.
  • Page 12 Smart Machine Smart Decision Power saving Typical power consumption in sleep mode is 1.04mA (BS_PA_MFRMS=9 ) Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. SIM800H can  search the 4 frequency bands automatically. The frequency bands can also be Frequency bands set by AT command “AT+CBAND”.

  • Page 13: Operating Mode

    Smart Machine Smart Decision Size: 17.8*15.8*2.4mm Physical characteristics Weight:1.35g Firmware upgrade Main serial port or USB port.(recommend to use USB port) Table 3: Coding schemes and maximum net data rates over air interface Coding scheme 1 timeslot 2 timeslot 4 timeslot CS-1 9.05kbps 18.1kbps...

  • Page 14: Functional Diagram

    Smart Machine Smart Decision 2.4. Functional Diagram The following figure shows a functional diagram of SIM800H: GSM baseband  GSM RF  Antenna interface  Other interface  Power Radio Supply Power management unit Frequency Digital Interface Analog Interface GPIOs Audio UART Analog base...

  • Page 15: Package Information

    Smart Machine Smart Decision 3. Package Information 3.1. Pin Out Diagram GSM_ VBAT PCM_ VBAT PCM_ PCM_ GPIO3 GPIO1 PCM_ ISINK1 GPIO2 SYNC NETLI ISINK0 SYNC KBR4 KBC1 USB_DP VBUS RESET KBR0 KBC4 KBR2 KBR3 SIM_ SIM_ USB_ VRTC MIC2P SPK2P KBR1 KBC2...

  • Page 16: Pin Description

    Smart Machine Smart Decision 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 capacitor (e.g. 4.7uF). If these pins are unused, VDD_EXT 2.8V power output...
  • Page 17 Smart Machine Smart Decision KBR2 KBR1 KBR0 GPIO GPIO1 Programmable general purpose input GPIO2 and output GPIO3 NETLIGHT Network status STATUS Power on status Serial port Data terminal ready Ring indicator Data carrier detect Request to send If these pins are unused, keep open.

  • Page 18: Package Dimensions

    Smart Machine Smart Decision FM_ANTN Differential 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 3.3. Package Dimensions Figure 3: Dimensions of SIM800H (Unit: mm) SIM800H _Hardware Design_V2.03 2016-10-10...
  • Page 19 Smart Machine Smart Decision Figure 4: Recommended PCB footprint outline (Unit: mm) SIM800H _Hardware Design_V2.03 2016-10-10...

  • Page 20: Application Interface

    Smart Machine Smart Decision 4. Application Interface 4.1. Power Supply The power supply range of SIM800H 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 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 especially with the 2A peak current in burst mode of the module. The following figure is the reference circuit.

  • Page 22: 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 23: Power Down Sim800H

    Smart Machine Smart Decision T>1.5s VBAT t>1s PWRKEY <0.7V (INPUT) 1.2s VDD_EXT t>3s STATUS Serial port Underfined Active Figure 12: Timing of power on module When power on procedure is completed, SIM800H will send following URC to indicate that the module is ready to operate at fixed baud rate.

  • Page 24: Reset Function

    Smart Machine Smart Decision save data before completely shut down. Before the power down procedure, the module will send URC: NORMAL POWER DOWN At this moment, AT commands can not be executed any more, and only the RTC is still active. Power down mode can also be indicated by STATUS or VDD_EXT, which is at low level at this time.

  • Page 25: Power Saving Mode

    Smart Machine Smart Decision pin to ground, then the module will reset. This pin is already isolated in the module, so the external isolation is not necessary. Following figure is internal circuit of the RESET pin. RESET Circuit 2.8V 4.7K RESET Module Figure 15: Reset circuit...

  • Page 26: Minimum Functionality Mode

    Smart Machine Smart Decision set SIM800H into minimum functionality. When SIM800H is in sleep mode and minimum functionality mode, the current of module is lowest. 4.3.1. Minimum Functionality Mode There are three functionality modes, which could be set by AT command “AT+CFUN=<fun>“. The command provides the choice of the functionality levels <fun>=0,1,4.

  • Page 27: Wake Up Sim800H From Sleep Mode 2

    Smart Machine Smart Decision 4.3.5. Wake Up SIM800H from Sleep Mode 2 When SIM800H is in sleep mode 2 (AT+CSCLK=2), the following methods can wake up the module: Send data to SIM800H via main serial port (the first character will lose). ...

  • Page 28: Serial Port And Usb Interface

    Smart Machine Smart Decision Note: The clock error becomes larger when VBAT is turned off and RTC circuit was supplied from the backup battery or the external capacitor. 4.5. Serial Port and USB Interface SIM800H default provides one unbalanced asynchronous serial ports. The module is designed as a DCE (Data Communication Equipment).

  • Page 29: Serial Interfaces

    Smart Machine Smart Decision Serial port can be used for GPRS service and AT communication.  Serial port supports the following baud rates:  1200, 2400, 4800, 9600, 19200, 38400, 57600,115200,230400 and 460800bps Autobauding only supports the following baud rates: ...
  • Page 30 Smart Machine Smart Decision GPIO GPIO EINT 5.6K 5.6K 5.6K Module (3.3V) Figure 21: Resistor matching circuit If the voltage of UART is 3V or3.3V, the following reference circuits are recommended: VDD_EXT Module Figure 22: Diode isolation 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...

  • Page 31: Debug Interface

    Smart Machine Smart Decision VDD_EXT Module VDD_EXT 4.7K 4.7K Figure 24: RX level matching circuit Note: When Figure22, Figure 23 and Figure 24 are used for electrical level isolation, if customers use serial port to upgrade SW, please note VDD_EXT has no voltage output during the upgrading process, LDO output could be used as VDD_EXT in the figure, upgrading through USB port is recommended.

  • Page 32: 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 SIM800H 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 SIM800H detects VBUS and could communicate normally with USB_DP and USB_DN, it will enter USB download mode automatically.

  • Page 33: Audio Interfaces

    Smart Machine Smart Decision HIGH Establish the call Hang up the call Idle Ring Figure 27: RI behaviour of voice 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. Please refer to the following figure. HIGH Ring Hang up...

  • Page 34: Speaker Interfaces Configuration

    Smart Machine Smart Decision SPK1P/1N output can directly drive 32Ω receiver, SIM800H 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 3.4V 8Ω THD+N=1% 0.53W 4.2V 8Ω...

  • Page 35: Microphone Interfaces Configuration

    Smart Machine Smart Decision 4.7.2. Microphone Interfaces Configuration These components should be placed to microphone as close as possible 33pF 10pF MIC1P/2P The lines in bold type should 33pF be accorded to differential 10pF signal layout rules Electret MIC1N/2N Microphone 33pF 10pF Module...

  • Page 36: Sim Card Interface

    Smart Machine Smart Decision will be some cheep noise from speaker output easily. So it is better to put big capacitors and ferrite beads near audio PA input. TDD noise has something to do with GND signal. If GND plane is not good, lots of high-frequency noises will interference microphone and speaker over bypass capacitor.

  • Page 37: Sim Card Design Guide

    Smart Machine Smart Decision SIM Card SIM_VDD SIM_RST 51Ω SIM_CLK 51Ω Module SIM_DET C707 10M 006 512 2 SIM_DATA 51Ω 22pF ESDA6V1 100nF Figure 33: Reference circuit of the 6-pin SIM card holder 4.8.2. SIM Card Design Guide SIM card signal could be interferenced by some high frequency signal, it is strongly recommended to follow these guidelines while designing: SIM card holder should be far away from GSM antenna ...
  • Page 38 Smart Machine Smart Decision Figure 34: Molex 91228 SIM card holder Table 18: 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 39: Pcm Interface

    Smart Machine Smart Decision Figure 35: Amphenol C707 10M006 512 SIM card holder Table 19: 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 40: Pcm Reference Circuit

    Smart Machine Smart Decision PCM_OUT PCM data output PCM_SYNC PCM synchrony PCM_IN PCM data input SIM800H 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 16bits(Fixed)

  • Page 41: Keypad Interface

    Smart Machine Smart Decision 4.10. Keypad Interface The keypad interface consists of 5 keypad column outputs and 5 keypad row inputs. with total 5*5*2, which is 50 keys. Module has two connections, which supports 25 keys and anther supports 50 keys. KBC0 KBC1 KBC2...
  • Page 42 Smart Machine Smart Decision Customer could cascade a less than 1K resistor to enhance the ESD performance, the connection diagram is as following: KBCx <1K Module KBRx Figure 39: Keypad reference circuit Whether using a 5*5 keys or 5*5*2 keys, the module can also detect the two buttons pressed. But when using a 5*5*2 button, the same row, column two buttons pressed at the same time can’t be detected, as shown below: KBCx Module...

  • Page 43: I2C Bus

    Smart Machine Smart Decision 4.11. I2C Bus The SIM800H provides an I2C interface which is only used in the embedded AT application. The highest data rate is 400kbit/s  Automatic start and stop bits  Generated response and confirmation automatically ...

  • Page 44: Adc

    Smart Machine Smart Decision 4.13. ADC Table 25: Pin definition of the ADC Pin name Pin number Description Analog voltage input SIM800H 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]. Table 26: ADC specification Parameter Unit...

  • Page 45: Network Status Indication

    Smart Machine Smart Decision Table 28: Buzzer characteristics Parameter Unit Working voltage Working current Note: PWM pin must be kept at low power level when module is in the power on procedure. 4.15. Network Status Indication Table 29: Pin definition of the NETLIGHT Pin name Pin number Description...

  • Page 46: Led Interface

    Smart Machine Smart Decision Table 31: Pin definition of the STATUS Pin name Pin number Description STATUS Operating status indication Note: For timing about STATUS, please reference to the chapter “4.2 power on/down scenarios” 4.17. LED Interface SIM800H provides two LED driver pin. The two pin are open-drain output. Table 32: Pin definition of the LED Pin name Pin number...

  • Page 47: Antenna Interface

    Smart Machine Smart Decision The timing of the synchronization signal is shown below. High level of the RF_SYNC pin indicates increased power consumption during transmission. 220us 577us Transmit burst RF_SYNC Figure 45: RF_SYNC signal during transmit burst 4.19. Antenna Interface There are three antenna ports for SIM800H, GSM antenna port named GSM_ANT, Bluetooth antenna port named BT_ANT and FM antenna port named FM_ANTP/FM_ANTN, The RF interface of the three antenna ports has an impedance of 50Ω.

  • Page 48: Bluetooth Antenna Interface

    Smart Machine Smart Decision R101， C101， C102 are the matching circuit, the value should be defined by the antenna design. Normally R101 is 0Ω, C101 and C102 are not mounted. The RF connector is used for conduction test. If the space between RF pin and antenna is not enough, the matching circuit should be designed as in the following figure: (Pin39) Module...

  • Page 49: Fm Antenna Interface

    Smart Machine Smart Decision R201, C201, C202 are the matching circuit, the value should be defined by the antenna design. Normally R201 is 1.2nH, C202 is 1.5pF and C201 are not mounted. There are some suggestions for placing components and RF trace lying for GSM and Bluetooth RF traces: The RF connector is used for conducted test, so keep it as close to pin GSM_ANT as possible;...

  • Page 50: Pcb Layout

    Smart Machine Smart Decision 5. PCB Layout Usually, most electronic products with good performance are based on good PCB layout. A bad PCB layout will lead to lots of issues, like TDD noise, SIM card not be detected, etc. the final solution for these problems is to redo PCB layout.

  • Page 51: Principle Of Pcb Layout

    Smart Machine Smart Decision Principle of PCB Layout During layout, attention should be paid to the following interfaces, like Antenna, power supply, SIM card interface, audio interface, and so on. 5.2.1 Antenna Interface The length of trace between pin output and connector should be as short as possible; ...

  • Page 52: Recommended Pcb Layout

    Smart Machine Smart Decision Recommended PCB Layout Based on above principles, recommended layout is shown in the following illustration. Figure 52: Recommended PCB layout SIM800H _Hardware Design_V2.03 2016-10-10...

  • 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 SIM800H. Table 36: Absolute maximum ratings Symbol Unit VBAT...

  • Page 54: Sim Card Interface Characteristics

    Smart Machine Smart Decision SIM Card Interface Characteristics Table 39: SIM card interface characteristics Symbol Parameter Unit High-level input current -1.0 Low-level input current -1.0 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 40: SIM_VDD characteristics Symbol...

  • Page 55: Current Consumption (Vbat=3.8V)

    Smart Machine Smart Decision Current Consumption (VBAT=3.8V) Table 43: Current consumption Symbol Parameter Conditions Unit VBAT Voltage Power drop PCL=5 PCL=5 Voltage ripple @ f<200kHz @ f>200kHz IVBAT Average current Power down mode Sleep mode (AT+CFUN=1)： ( BS-PA-MFRMS=9 ) 1.04 ( BS-PA-MFRMS=5) 1.14 ( BS-PA-MFRMS=2)
  • Page 56 Smart Machine Smart Decision Table 44: Bluetooth characteristics Terms Contents Bluetooth specification Version3.0 Channel spacing 1MHz Number of RF channel Power class Operation mode (Rx/Tx) Time division multiplex either transmit or receive Frequency hopping after one Rx/Tx cycle Items Unit 1.
  • Page 57 Smart Machine Smart Decision 10.8 99% DEVM (8DPSK) 10.9 Peak DEVM (8DPSK) RX characteristics 11. Sensitivity (BER < 0.1%) 11.1 2402MHz 11.2 2441MHz 11.3 2480MHz 12. C/I Performance (BER < 0.1%) 12.1 co-channel ratio (-60dBm input) 12.2 1MHz ratio (-60dBm input) 12.3 2MHz ratio (-60dBm input) 12.4 3MHz ratio (-67dBm input) 12.5 image +/- 1MHz ratio (-67dBm input)

  • Page 58: Electro-Static Discharge

    Smart Machine Smart Decision Electro-Static Discharge SIM800H 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 46: The ESD characteristics (Temperature: 25 ℃, H um i di ty: 45 % ) Pin name Contact discharge...

  • Page 59: Module Rf Receive Sensitivity

    Smart Machine Smart Decision Table 48: 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 ±3 ±4 ±3 ±4 ±3 ±4 ±3 ±4 ±3 ±4 ±4...

  • Page 60: Manufacturing

    Smart Machine Smart Decision 7. Manufacturing 7.1. Top and Bottom View of SIM800H Figure 53: Top and bottom view of SIM800H 7.2. Typical Solder Reflow Profile Figure 54: Typical solder reflow profile of lead-free processes SIM800H _Hardware Design_V2.03 2016-10-10...

  • Page 61: The Moisture Sensitivity Level

    Smart Machine Smart Decision 7.3. The Moisture Sensitivity Level The moisture sensitivity level of SIM800H 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 necessary to bake the module if the above conditions are not met: Table 51: Moisture sensitivity level and floor life Moisture Sensitivity Level...

  • Page 62: Appendix

    Smart Machine Smart Decision 8. Appendix I. Related Documents Table 53: Related documents Document name Remark SIM800 Series AT Command Manual SIM800 Series UART Port Application Note_V1 01.doc ITU-T Draft new Serial asynchronous automatic dialing and control recommendation V.25ter Digital cellular telecommunications (Phase 2+); AT command set for GSM 07.07 GSM Mobile Equipment (ME) GSM 07.10...

  • Page 63: 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 Coding Scheme Clear to Send Data Terminal Equipment (typically computer, terminal, printer) Data Terminal Ready Discontinuous Transmission Enhanced Full Rate EGSM Enhanced GSM Electrostatic Discharge European Telecommunication Standard...
  • Page 64 Smart Machine Smart Decision USSD Unstructured Supplementary Service Data 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 SIM phonebook Not connect...

  • Page 65: 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 66 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 SIM800H _Hardware Design_V2.03 2016-10-10...

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