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Summary of Contents for SimCom SIM800H
- Page 1 SIM800H_Hardware_Design_V1.01...
- 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.
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Page 3: Table Of Contents
Power Saving Mode ......................27 4.3.1. Minimum Functionality Mode ......................27 4.3.2. Sleep Mode (AT+CSCLK=1) ......................28 4.3.3. Wake Up SIM800H from Sleep Mode (AT+CSCLK=1) ..............28 4.4. RTC Backup........................28 4.5. Serial Port and USB Interface.....................29 4.5.1 Function of Serial Port ........................30 4.5.2... - Page 4 Smart Machine Smart Decision 4.8.3. Design Considerations for SIM Card Holder ..................40 4.9. PCM Interface ........................42 4.9.1. PCM Multiplexing Function ....................... 43 4.9.2. PCM Interface ............................. 43 4.9.3. LCD Display/SPI Interface ......................... 44 4.9.4. SD Card Interface..........................44 4.10. Keypad Interface .........................45 4.10.1.
- Page 5 Smart Machine Smart Decision 6.11 Module RF Receive Sensitivity ..................62 6.12 Module Operating Frequencies...................62 Manufacturing ....................63 7.1. Top and Bottom View of SIM800H ...................63 7.2. Typical Solder Reflow Profile ....................63 7.3. The Moisture Sensitivity Level...................63 7.4. Baking Requirements......................64 Appendix......................65 Related Documents ......................65...
- Page 6 Smart Machine Smart Decision Table Index Table 1: SIM800H key features ......................11 Table 2: Coding schemes and maximum net data rates over air interface........13 Table 3: Overview of operating modes...................13 Table 4: Pin description ........................16 Table 5: Recommended Zener diode ....................21 Table 6: Electronic characteristic of the RESET pin ..............27...
- Page 7 Smart Machine Smart Decision Table 46: VDD_EXT characteristics ....................59 Table 47: VRTC characteristics......................59 Table 48: Current consumption ......................60 Table 49: The ESD characteristics (Temperature: 25℃, Humidity: 45 %)........61 Table 50: GSM850 and EGSM900 conducted RF output power ...........61 Table 51: DCS1800 and PCS1900 conducted RF output power ............62 Table 52: Conducted RF receive sensitivity ...................62 Table 53: Operating frequencies .....................62 Table 54: Moisture sensitivity level and floor life................64...
- Page 8 Figure 10: Powered on/down module using transistor ..............23 Figure 11: Powered on/down module using button ................23 Figure 12: Timing of power on module ..................24 Figure 13: Timing of power down SIM800H by PWRKEY ............25 Figure 14: Reset circuit ........................26 Figure 15: Reset timing sequence ....................27 Figure 16: RTC supply from capacitor ...................28...
- Page 9 Figure 51: GND pin of the earphone use to be the FM antenna interface ........54 Figure 52: Pin assignment.......................55 Figure 53: Recommended PCB layout ...................57 Figure 54: Top and bottom view of SIM800H ................63 Figure 55: Typical solder reflow profile ..................63 SIM800H_Hardware_Design_V1.01...
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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
A SIM card interface Support Bluetooth Support FM Support one PWM SIM800H is designed with power saving technique so that the current consumption is as low as 0.7mA in sleep mode. 2.1. SIM800H Key Features Table 1: SIM800H key features... - Page 12 Smart Machine Smart Decision Normal operation: -40°C ~ +85°C Temperature range Storage temperature -45°C ~ +90°C Data GPRS 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 PAP protocol for PPP connect Integrate the TCP/IP protocol.
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Page 13: Operating Mode
CS-4 21.4kbps 42.8kbps 85.6kbps 2.2. Operating Mode The table below summarizes the various operating modes of SIM800H. 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 and no hardware interrupt (such as GSM/GPRS GPIO interrupt or data on serial port). -
Page 14: Functional Diagram
Smart Machine Smart Decision 2.3. Functional Diagram The following figure shows a functional diagram of SIM800H: GSM baseband GSM RF Antenna interface Other interface Figure 1: SIM800H functional diagram SIM800H_Hardware_Design_V1.01 2013-08-20... -
Page 15: Package Information
Smart Machine Smart Decision 3. Package Information 3.1. Pin out Diagram Figure 2: SIM800H pin out diagram (Top view) SIM800H_Hardware_Design_V1.01 2013-08-20... -
Page 16: Pin Description
Smart Machine Smart Decision 3.2. Pin Description Table 4: Pin description Pin name Pin number Description Comment Power supply VBAT 1,42 Power supply recommended VRTC Power supply for RTC connect with a battery or a capacitor (e.g. 4.7uF). If these pins are unused, VEXT 2.8V power output keep open. - Page 17 Smart Machine Smart Decision ROW2 ROW1 ROW0 GPIO GPIO1 Programmable general purpose input GPIO2 and output GPIO3 NETLIGHT Network status STATUS Power on status Serial port UART_DTR Data terminal ready UART_RI Ring indicator UART_DCD Data carrier detect If these pins are unused, Request to send keep open.
- Page 18 Smart Machine Smart Decision Synchronizing signal of RF BPI_BUS1 Synchronizing signal of RF Other RESET Reset input(Active low) ISINK1 Drive keypad backlight ISINK0 Drive LCD backlight SIM800H_Hardware_Design_V1.01 2013-08-20...
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Page 19: Package Dimensions
Smart Machine Smart Decision 3.3. Package Dimensions Figure 3: Dimensions of SIM800H (Unit: mm) SIM800H_Hardware_Design_V1.01 2013-08-20... -
Page 20: Figure 4: Recommended Pcb Footprint Outline (Unit: Mm)
Smart Machine Smart Decision Figure 4: Recommended PCB footprint outline (Unit: mm) SIM800H_Hardware_Design_V1.01 2013-08-20... -
Page 21: Application Interface
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 SIM800H VBAT pins. Figure 5: Reference circuit of the VBAT input... -
Page 22: 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 SIM800H 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 When battery is used, the total impedance between battery and VBAT pins should be less than 150mΩ. -
Page 23: Monitoring Power Supply
Power on SIM800H User can power on SIM800H 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 circuit is shown as below. -
Page 24: Power Down Sim800H
4.2.2.1. Power down SIM800H by the PWRKEY Pin User can power down SIM800H by pulling down the PWRKEY pin for at least 1 second and release. Please refer to the power on circuit. The power down timing is illustrated in the following figure. -
Page 25: Figure 13: Timing Of Power Down Sim800H By Pwrkey
4.2.2.2. Power down SIM800H by AT Command SIM800H can be powered down 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 26: Reset Function
Reset Function SIM800H also has a RESET pin (pin 49) used to reset the module. This function is used as an emergency reset only when AT command “AT+CPOWD=1” and the POWER_ON pin has no effect. User can pull the RESET pin to ground, then the module will reset. -
Page 27: Power Saving Mode
SIM800H has two power saving modes: Minimum functionality mode and sleep mode. AT command “AT+CSCLK=1”can be used to set SIM800H into sleep mode. AT command “AT+CFUN=<fun>“ can be used to set SIM800H into minimum functionality. When SIM800H is in sleep mode and minimum functionality mode, the current of module is lowest. -
Page 28: Sleep Mode (At+Csclk=1)
Sleep Mode (AT+CSCLK=1) User can control SIM800H 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), SIM800H will enter sleep mode automatically. -
Page 29: Serial Port And Usb Interface
Figure 18: RTC supply from rechargeable battery 4.5. Serial Port and USB Interface SIM800H 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 30: Function Of Serial Port
Autobauding only supports the following baud rates: 1200, 2400, 4800, 9600, 19200, 38400 and 57600bps The default setting is autobauding. Autobauding allows SIM800H 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 31: Figure 19: Connection Of The Serial Interfaces
Smart Machine Smart Decision MODULE ( DCE) CUSTOMER (DTE) Serial port Serial port UART _ DTR UART _ DCD UART1_RI RING Figure 19: Connection of the serial interfaces 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 32: Figure 21 : Diode Isolation Circuit
Smart Machine Smart Decision MODULE Figure 21 : 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: Figure 22: TX level matching circuit Figure 23: RX level matching circuit Note: When Fig 22 and Fig 23are used for electrical level isolation, if customers use serial port to upgrade... -
Page 33: Debug Interface
If upgrading through USB port, it is necessary to power on SIM800H first, then connect VBUS, USB_DP, USB_DM, 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_DM, it will enter USB download mode automatically. -
Page 34: Multiplexing Function Of Serial Port
Smart Machine Smart Decision MODULE ( DCE) I/O Connector Serial port PWRKEY PWRKEY Figure 25: Connection for software upgrading and debugging The serial port and the debug port support the CMOS level. If user connects the module to the computer, the level shifter should be added between the DCE and DTE. -
Page 35: Ri Behaviors
Smart Machine Smart Decision 4.6. RI Behaviors Table 12: RI behaviors State RI response Standby High The pin is changed to low. When any of the following events occur, the pin will be changed to high: Voice call （1）Establish the call （2）Hang up the call The pin is changed to low. -
Page 36: Audio Interfaces
Secondary SPK2P Secondary Audio output positive SPK2N Secondary Audio output negative 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 8Ohm THD+N=1% 0.87W... -
Page 37: Speaker Interfaces Configuration
Smart Machine Smart Decision is used to set the side-tone level. In addition, AT command “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. The audio signals have to be layout according to differential signal layout rules as shown in following figures. -
Page 38: Audio Electronic Characteristic
Smart Machine Smart Decision 4.7.3. Audio Electronic Characteristic Table 15: Microphone input characteristics Parameter Unit Microphone biasing voltage Working current Input impedance(differential) KΩ Idle channel noise dBm0 Input level:-40dBm0 SINAD Input level:0dBm0 Table 16: Audio output characteristics Parameter Conditions Unit =32 Ohm receiver Normal output =8 Ohm speaker... -
Page 39: Sim Card Application
Smart Machine Smart Decision 4.8.1. SIM Card Application Table 17: SIM pin definition Pin name Pin number Function VSIM Voltage supply for SIM card. Support 1.8V or 3V SIM card SIM_DATA SIM data input/output SIM_CLK SIM clock SIM_RST SIM reset SIM_PRE SIM card detection It is recommended to use an ESD protection component such as ST... -
Page 40: Sim Card Design Guide
Add some TVS and the parasitic capacitance should not exceed 50pF, and 22Ohm resistor in serials the SIM 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.User can visit http://www.molex.com for more information about the holder. SIM800H_Hardware_Design_V1.01... -
Page 41: Table 18: Pin Description (Molex Sim Card Holder)
Connect to GND Not connect SIM_DATA SIM card data I/O SIM_PRE Detect SIM card presence For 6-pin SIM card holder, SIMCom recommends to use Amphenol C707 10M006 5122 .User can visit http://www.amphenol.com for more information about the holder. SIM800H_Hardware_Design_V1.01 2013-08-20... -
Page 42: Pcm Interface
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 4.9. PCM Interface SIM800H provides a hardware PCM interface: Table 20: PCM Pin definition Pin name Pin number Description SIM800H_Hardware_Design_V1.01 2013-08-20... -
Page 43: Pcm Multiplexing Function
PCMOUT PCM data output PCMSYNC PCM synchrony PCMIN 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... -
Page 44: Lcd Display/Spi Interface
Smart Machine Smart Decision Figure 36: PCM reference circuit 4.9.3. LCD Display/SPI Interface SIM800H provides a serial interface. It could be used as SPI interface in the embedded AT application. Figure 37: LCD reference circuit 4.9.4. SD Card Interface Figure 38: SD reference circuit SIM800H_Hardware_Design_V1.01... -
Page 45: Keypad Interface
Smart Machine Smart Decision If power supply is 2.8V for SD card, user can use VDD_EXT; if power supply is 3.3V, please use external design LDO. 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. -
Page 46: Figure 40: 50 Keys Reference Circuit
Smart Machine Smart Decision Figure 40: 50 keys reference circuit ： Note Do not change the 20KOhm resistor in the diagram. Customer could cascade a less than 1K resistor to enhance the ESD performance, the connection diagram is as following: Figure 41: Keypad reference circuit Whether using a 5*5 keys or 5*5*2 keys, the module can also detecte the two buttons pressed. -
Page 47: Keypad Multiplexing Function
C serial bus data Notes: 1.This function is not supported in the standard firmware. If user wants this function, the firmware must be customized. Please contact SIMCom for more details. 2.If user design I C please pull up to VDD_EXT. -
Page 48: I2C Multiplexing Function
4.12. General Purpose Input/Output (GPIO) SIM800H 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 49: Pwm Multiplexing Function
PWM signal SIM800H provides a PWM which can be used to drive a vibrator, and a backlight LED for display or keyboard. PWM output frequency varies from 0 to 2KHz. Two 7-bit unsigned binary parameters are used for the output period and for the duty cycle. -
Page 50: Netlight Multiplexing Function
Table 34: Status of the NETLIGHT pin Status SIM800H behavior SIM800H is not running 64ms On/ 800ms Off SIM800H not registered the network 64ms On/ 3000ms Off SIM800H registered to the network 64ms On/ 300ms Off GPRS communication is established... -
Page 51: Status Multiplexing Function
Mode 1 STATUS STATUS GPIO4 Note: Multiplexing function need different software supply. 4.17. LED Interface SIM800H provides two LED driver pin. The two pin are open-drain output. Table 38: Pin definition of the LED Pin name Pin number Description ISINK0... -
Page 52: Antenna Interface
4.19.1. GSM Antenna Interface There is a GSM antenna pad named RF_ANT for SIM800H, 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 53: Bluetooth Antenna Interface
Smart Machine Smart Decision Figure 47: GSM antenna matching circuit 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: Figure 48: GSM simple antenna matching circuit Normally R101 is 0Ω, C101 and C102 are not mounted. -
Page 54: Fm Antenna Interface
Smart Machine Smart Decision Figure 49: Bluetooth antenna matching circuit 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 RF_ANT as possible;... -
Page 55: 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 56: 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 basis principle is that, the length of trace between pin output and connector should be as short as possible, in order to avoid coupling issue. -
Page 57: Recommended Pcb Layout
Smart Machine Smart Decision Recommended PCB Layout Based on above principles, recommended layout is shown in the following illustration. Figure 53: Recommended PCB layout SIM800H_Hardware_Design_V1.01 2013-08-20... -
Page 58: 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 SIM800H. Table 41: Absolute maximum ratings Symbol... -
Page 59: Sim Card Interface Characteristics
Smart Machine Smart Decision SIM Card Interface Characteristics Table 44: SIM card interface characteristics 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 45: SIM_VDD characteristics Symbol Parameter... -
Page 60: Current Consumption (Vbat=3.8V)
Smart Machine Smart Decision Current Consumption (VBAT=3.8V) Table 48: Current consumption Symbol Parameter Conditions Unit VBAT Voltage Power drop PCL=5 Voltage ripple PCL=5 @ f<200kHz @ f>200kHz Average currnet Power down mode VBAT Sleep mode (at+cfun=1)： ( BS-PA-MFRMS=9 ) 1.02 ( BS-PA-MFRMS=5) 1.11 ( BS-PA-MFRMS=2) -
Page 61: 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 49: The ESD characteristics (Temperature: 25℃, Humidity: 45 %) -
Page 62: Module Rf Receive Sensitivity
Smart Machine Smart Decision Table 51: 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 63: Manufacturing
Figure 55: Typical solder reflow profile 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 relative humidity of <60% (RH). It is SIM800H_Hardware_Design_V1.01... -
Page 64: Baking Requirements
For product handling, storage, processing, IPC / JEDEC J-STD-033 must be followed. 7.4. Baking Requirements SIM800H modules are vacuum packaged, and guaranteed for 6 months storage without opening or leakage under the following conditions: the environment temperature is lower than 40℃, and the air humidity is less than 90%. -
Page 65: Appendix
Smart Machine Smart Decision 8. Appendix I. Related Documents Table 56: Related documents Document name Remark SIM800 Series_AT Command Manual ITU-T Draft 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 66: Multiplexing Function
Smart Machine Smart Decision II. Multiplexing Function Table 57: Multiplexing function Pin name Pin number Mode 0(default) Mode 1 Mode 2 Mode 3 STATUS STATUS GPIO4 SIMPRE SIMPRE GPIO5 EINT7 COL0 COL0 GPIO6 COL1 COL1 GPIO7 COL2 COL2 GPIO8 COL3 COL3 GPIO9 COL4... -
Page 67: Terms And Abbreviations
Smart Machine Smart Decision III. Terms and Abbreviations Table 58: Terms and abbreviations Abbreviation Description Analog-to-Digital Converter Adaptive Multi-Rate 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 Electrostatic Discharge... - Page 68 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...
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Page 69: Safety Caution
Smart Machine Smart Decision IV. Safety Caution Table 59: 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 70 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 SIM800H_Hardware_Design_V1.01 2013-08-20...
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