SIM800F_Hardware Design_V1.
Smart Machine Smart Decision Document Title SIM800F Hardware Design Version 1.00 Date 2015-07-31 Status Release Document Control ID SIM800F_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.
Smart Machine Smart Decision Contents Contents.................................................................................................................................................................... 3 Table Index ............................................................................................................................................................... 6 Figure Index ...............................................................................................................
Smart Machine Smart Decision 4.9.2 SIM Card Circuit Design Guide.......................................................................................................... 38 4.9.3 Design Considerations for SIM Card Holder ...................................................................................... 38 4.10 DISP Interface ........................................................................................................................................ 39 4.11 Keypad Interface .................
Smart Machine Smart Decision III. IV. Terms and Abbreviations ........................................................................................................................ 61 Safety Caution ........................................................................................................................................ 63 SIM800F_Hardware Design_V1.
Smart Machine Smart Decision Table Index TABLE 1: SIM800F 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 ..........................................
Smart Machine Smart Decision TABLE 46: THE ESD CHARACTERISTICS (TEMPERATURE: 25℃, HUMIDITY: 45 %) ....................................... 54 TABLE 47: SIM800F GSM 850 AND EGSM 900 CONDUCTED RF OUTPUT POWER............................................ 54 TABLE 48: SIM800F DCS 1800 AND PCS 1900 CONDUCTED RF OUTPUT POWER............................................. 55 TABLE 49: SIM800F CONDUCTED RF RECEIVE SENSITIVITY .............................................................................
Smart Machine Smart Decision Figure Index FIGURE 1: SIM800F FUNCTIONAL DIAGRAM ......................................................................................................... 14 FIGURE 2: SIM800F PIN OUT DIAGRAM (TOP VIEW)............................................................................................. 15 FIGURE 3: DIMENSIONS OF SIM800F（UNIT: MM） .............................................................................................
Smart Machine Smart Decision FIGURE 46: TOP AND BOTTOM VIEW OF SIM800F................................................................................................. 57 FIGURE 47: TYPICAL SOLDER REFLOW PROFILE ................................................................................................. 57 SIM800F_Hardware Design_V1.
Smart Machine Smart Decision Version History Date Version Description of change Author 2015-07-31 1.00 Initial release Yan Zhang Hailin Yang SIM800F_Hardware Design_V1.
Smart Machine Smart Decision 1 Introduction This document describes SIM800F hardware interface in great detail. This document can help users understand both the interface specifications and the electrical and mechanical details of SIM800F quickly. With the help of this document and other SIM800F application notes or user guide, users can use SIM800F to design various applications quickly.
Smart Machine Smart Decision Power saving Typical power consumption in sleep mode is 0.55mA ( AT+CFUN=0 ) SIM800F Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900 SIM800F can search the 4 frequency bands automatically. The frequency bands also can be set by AT command “AT+CBAND”.
Smart Machine Smart Decision Table 2: Coding schemes and maximum net data rates over air interface 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 2.2 Operating Modes The table below summarizes the various operating modes of SIM800F.
Smart Machine Smart Decision 2.3 SIM800F Functional Diagram Power Supply Power management unit GSM Radio Frequency BT RTC Digital Interface Analog Interface UART Audio Analog baseband Digital baseband ADC USB SIM Keypad /GPIO LCD/SPI I2C PWM Figure 1: SIM800F functional diagram SIM800F_Hardware Design_V1.
Smart Machine Smart Decision 3 3.1 Package Information Pin out Diagram Figure 2: SIM800F pin out diagram (Top view) SIM800F_Hardware Design_V1.
Smart Machine Smart Decision 3.2 Pin Description Table 4: Pin description Pin name Pin number I/O Description 55,56,57 I Power supply Comment Power supply VBAT VRTC 26 I/O Power supply for RTC It is recommended to connect with a battery or a capacitor (e.g. 4.7uF) VDD_EXT 15 O 2.
Smart Machine Smart Decision KBC2 49 keypad column 2 KBC3 48 keypad column 3 KBC4 47 keypad column 4 GPIO10 51 GPIO10 Left floating if unused GPIO11 67 GPIO11 Do not pull up externally; Left floating if unused GPIO12 68 GPIO12 Left floating if unused Serial port UART1_RXD 10 I Receive data UART1_TXD 9 O Transmit data UART1_RTS 8 I Request to send UART1_CTS 7 O Clear to send UART1_DCD 5 O Data carrier detect UART1_RI 4 O Ring indicator UART1_DTR 3 I Data termi
Smart Machine Smart Decision 3.3 Package Dimensions Figure 3: Dimensions of SIM800F（Unit: mm） SIM800F_Hardware Design_V1.
Smart Machine Smart Decision Figure 4: Recommended PCB footprint outline（Unit: mm） Note: Keep copper out of area A. Do not place via in area B to avoid short circuit between the vias on customer board and the test points on the bottom side of the module. SIM800F_Hardware Design_V1.
Smart Machine Smart Decision 4 4.1 Application Interface Power Supply The power supply of SIM800F ranges from 3.4V to 4.4V, and 4.0V is recommended. It must be able to provide sufficient current up to 2A for the high-power transmitting. If the DC input voltage is +5V and customers do not care about the power efficiency, a high-current low-dropout regulator is recommended. The following figure is the reference design.
Smart Machine Smart Decision Figure 7: Reference circuit of the VBAT input Where CA is a 100uF tantalum capacitor with low ESR; CB could be a 1~10uF ceramic capacitor; 33PF and 10PF capacitors are used for eliminating the high frequency interference; 5.1V/500mW zener diode can protect the module against voltage surge. All of these components should be placed as close to VBAT pins as possible.
Smart Machine Smart Decision Figure 9: The low limit of VBAT voltage drop during transmitting To decrease voltage drop, the PCB traces from power supply to VBAT pins must be wide and short enough. The power IC and the bypass capacitor should be placed as close to the module as possible. 4.1.1 Power Supply Pins Pin 55, 56, 57 are VBAT input pins, and pin 62, 63, 64, 65 are the main GND for VBAT. The other GND pins should be connected as well. 4.1.
Smart Machine Smart Decision Figure 12: Timing of power on module If a fixed baud rate was set, when power on procedure is completed, SIM800F will send following URC to indicate that the module is ready to operate: RDY This URC does not appear when auto baud detect function is active. Note: Users can use AT command “AT+IPR=x” to set a fixed baud rate and save the configuration to non-volatile flash memory.
Smart Machine Smart Decision Note: 1. If the PWRKEY pull down time exceeds 33s, SIM800F module will power up again. 2. VDD_EXT will be turned off after PWRKEY was released for at least 55ms and STATUS was changed to low. If 1sT1+55ms 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.
Smart Machine Smart Decision If the temperature > +85℃, the following URC will be reported, and the module will be automatically powered down: +CMTE: 2 If the temperature < -40℃, the following URC will be reported, and the module will be automatically powered down: +CMTE:-2 At this moment, AT commands can not be executed any more, and only the RTC is still active. Power off mode can also be indicated by STATUS pin, which is at low level at this time.
Smart Machine Smart Decision RESET pin is pulled up to 2.8V internally, so the users could set the GPIO as an open-drain output pin when use MCU’s GPIO to control it. Table 6: Electronic characteristic of the RESET Pin Pin name Symbol Min Typ Max Unit VIH 2.7 - 2.9 V VIL - - 0.6 V - mS RESET Tpull down 105 The reset sequence is illustrated as below: Figure 16: Reset timing 4.4 Power Saving Mode SIM800F has two power saving modes: minimum functionality mode and sleep mode.
Smart Machine Smart Decision port is still accessible, no matter which functionality mode it is in. For detailed information about the AT Command “AT+CFUN=”, please refer to document [1]. Table 7: Current consumption of Minimum Functionality Mode BS-PA-MFRMS Current consumption in sleep mode (mA) 0 N/A 0.55 9 0.85 5 0.95 2 1.30 N/A 0.60 1 4 4.4.2 Sleep Mode 1 (AT+CSCLK=1) Users can control SIM800F module to enter or exit the sleep mode 1 (AT+CSCLK=1) by DTR signal.
Smart Machine Smart Decision 4.5 RTC Backup VRTC is the power supply for RTC circuit, and its typical value is 2.8V. To allow the RTC to operate even when VBAT is turned off, it is recommended to connect the VRTC pin to a backup battery or an external large-capacitance capacitor (100uF is recommended). When VBAT is turned on, RTC circuit is supplied from an internal LDO, and the backup battery or the external capacitor will be charged through VRTC pin.
Smart Machine Smart Decision 4.
Smart Machine Smart Decision Serial port supports the following baud rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200bps The default setting is auto baud detection Auto baud detection allows SIM800F to detect the baud rate of the host device automatically. Pay more attention to the following requirements: Synchronization between DTE and DCE: When DCE powers on with auto baud detection enabled, firstly, users must send character “A” or “a” to synchronize the baud rate.
Smart Machine Smart Decision Figure 21: Level converting by resistor If the voltage of UART is 3V or3.3V, users also can use following reference circuits: Figure 22: Level converting by diodes Note: when diode is used for level converting, customer should check the voltage drop on the diode to make sure the signal’s voltage level could meet both module and DTE’s electrical character. The recommend diode is Schottky diode e.g. RB551V-30TE-17 and SDM20U40.
Smart Machine Smart Decision Module VDD_EXT DTE VDD_EXT VDD 4.7K 4.7K 47K TXD RXD Figure 24: RX level converting by transistor 4.6.3 USB Interface USB interface supports software debug function. When power on the module, connect VBUS, USB_DP, USB_DN and GND to PC, install the driver successfully, a com port could be recognized by PC, then customer could debug via this com port.
Smart Machine Smart Decision If upgrading through USB interface, it is necessary to power on SIM800F 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 SIM800F detects USB_VBUS and could communicate with USB_DP and USB_DN, it will enter USB download mode automatically.
Smart Machine Smart Decision Figure 27: RI behaviour of voice calling as a receiver 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: Figure 29: RI behaviour as a caller 4.8 Audio Interfaces SIM800F provides one analog input for electronic microphone and one analog output to drive 32Ω receiver.
Smart Machine Smart Decision “AT+CMIC” is used to adjust the input gain level of microphone. “AT+CLVL” is used to adjust the output gain level. “AT+SIDET” is used to set the side-tone level. For more details about AT command, please refer to document [1] and document [5]. In order to improve audio performance, the following reference circuits are recommended. The audio trace should be routed in differential and shielded by GND shown as below: 4.8.
Smart Machine Smart Decision 4.8.3 Audio Electronic Characteristics Table 13: Microphone Input Characteristics Parameter Min Typ Max Unit Mic biasing voltage - 1.9 2.2 V Working Current - - 2.0 mA Input impedance(differential) 13 20 27 KΩ Idle channel noise - - -67 dBm0 Input level:-40dBm0 29 - - dB Input level:0dBm0 - 69 - dB SINAD Table 14: Audio Output Characteristics parameter Conditions Min Typ Max Unit Normal output RL=32 Ω receiver - 15 90 mW 4.8.
Smart Machine Smart Decision Table 15: SIM pin definition Pin name Pin number Function SIM_VDD 18 Voltage supply for SIM card. Support 1.8V or 3V SIM card SIM_DATA 15 SIM data input/output SIM_CLK 16 SIM clock SIM_RST 17 SIM reset SIM_DET 14 SIM card detection The SIM_DET pin is used for SIM card detection. Users can select the 8-pin SIM card holder to implement this function. AT command “AT+CSDT” is used to enable or disable SIM card detection function.
Smart Machine Smart Decision 4.9.2 SIM Card Circuit Design Guide SIM card signal could be interfered by the high speed signal, it is recommended to follow these guidelines while designing: 4.9.
Smart Machine Smart Decision C2 SIM_RST SIM card reset C3 SIM_CLK SIM card clock C4 GND Connect to GND C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SIM card data I/O C8 SIM_DET Detect SIM card presence For 6-pin SIM card holder, SIMCom recommends to use Amphenol C707 10M006 5122. Users can visit http://www.amphenol.com for more information about the holder.
Smart Machine Smart Decision Table 18: Pin definition of DISP interface Pin name Pin number Description DISP_CLK 11 Display clock DISP_DATA 12 Display data DISP_D/C 13 Data/command select DISP_CS 14 Chip select For the connection between LCD and SIM800F module, please refer to below figure: Figure 36: Connection of DISP interface It could also be used as other function in some applications.
Smart Machine Smart Decision KBR1 43 GPIO KBR1 KBR0 44 GPIO KBR0 KBC4 47 GPIO KBC4 KBC3 48 GPIO KBC3 KBC2 49 GPIO KBC2 KBC1 50 GPIO KBC1 Figure 37: Reference circuit of the keypad interface Note: keypad function is not supported in the standard firmware. If you need, please contact SIMCom.. 4.12 GPIO SIM800F provides 3 GPIO, which could be used as RF_SYNC/JD and UART2.
Smart Machine Smart Decision 4.12.1 RF_SYNC/JD RF synchronization signal could indicate the incoming GSM burst. The timing is shown as below: Figure 38: RF_SYNC signal during transmit burst GPIO11 can also be used to indicate the RF jamming. The RF_SYNC function and RF Jamming Detection function can be switched by AT+SJDR command. For more details, please refer to document [1].
Smart Machine Smart Decision Support high speed mode Support slave clock extension START/STOP/REPEATED condition Manual transfer mode Multi-bytes write per transfer (up to 8 data bytes for non-DMA mode) Multi-bytes read per transfer (up to 8 data bytes for non-DMA mode) Multi-transfer per transaction Combined format transfer with length change capability Active drive/write-and I/O configuration Table 24: Pin definition of the I2C Pin name Pin number Description SDA 37 I2C bus data
Smart Machine Smart Decision 4.
Smart Machine Smart Decision Table 32: STATUS multiplex function Pin name Pin number Mode 0(default) Mode 1 STATUS 66 STATUS GPIO 4.17 PWM Table 33: Pin definition of the PWM Pin name Pin number Description PWM1 35 PWM1 PWM2 36 PWM2 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. The AT command “AT + SPWM” is used to set the output period and duty cycle of the PWM.
Smart Machine Smart Decision 4.18 KPLED SIM800F provides one open-drain LED driver pin. Table 36: Pin definition of the KPLED Pin name Pin number Description KPLED 23 Sink current for keypad LED Reference circuit is recommended in the following figure: Figure 41: KPLED driver reference circuit Table 37: KPLED specification Pin name Min Typ Max Unit KPLED - - 60 mA 4.19 Bluetooth SIM800F supports Bluetooth function which can be operated by AT commands conveniently.
Smart Machine Smart Decision 4.20.1 GSM Antenna Interface SIM800F 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: GND (Pin59) Module GSM Antenna R101 GSM_ANT C101 C102 GND (Pin61) Figure 42: 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.
Smart Machine Smart Decision 4.20.2 Bluetooth Antenna Interface For Bluetooth antenna, it is recommended to reserve the matching circuit as following: Figure 44: Bluetooth antenna matching circuit R201, C201, C202 are the matching circuit, the values depend on antenna debug result. Normally R201 is 0Ω, C201 and C202 are not mounted.
Smart Machine Smart Decision 5 PCB Layout Usually, most electronic products with good performance are based on good PCB layout. Poor PCB layout will lead to lots of issues, like TDD noise, SIM card undetected, etc. The final solution for these problems is to redo PCB layout. Making good PCB layout will save developing schedule and cost as well. This section will give some guidelines on PCB layout to eliminate interfere or noise by greatest degree, and save product development period. 5.
Smart Machine Smart Decision 5.2 Principle of PCB Layout During layout, we should pay attention to the following interfaces, such as Antenna, power supply, SIM card interface, audio interface and so on. 5.2.1 Antenna 5.2.2. Power Supply 5.2.3 SIM card holder has no anti-EMI component inside.
Smart Machine Smart Decision 6 Electrical, Reliability and Radio Characteristics 6.1 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 SIM800F. Table 38: Absolute maximum ratings Symbol Parameter Min Typ Max Unit VBAT VBAT power supply voltage -0.3 - 4.5 V VBUS USB power supply voltage -0.3 - 7.
Smart Machine Smart Decision VIL Low-level input voltage VOH High-level output voltage VOL Low-level output voltage 6.5 2.4 - - V - - 0.4 V 2.4 V 1.7 - - V 2.7 - - V - - 0.1 V - - 0.1 V Min Typ Max Unit 2.75 2.9 3.00 1.65 1.80 1.95 - - 10 mA SIM_VDD Characteristics Table 42: SIM_VDD characteristics Symbol Parameter VO Output voltage IO Output current 6.
Smart Machine Smart Decision 6.8 Current Consumption (VBAT = 4V) Table 45: Current consumption Symbol Parameter VBAT Voltage IVBAT Conditions Min Max 4.0 Unit V Power drop PCL=5 350 mV Voltage ripple PCL=5 @ f<200kHz @ f>200kHz 50 2.0 mV mV Average current Power down mode 130 uA Sleep mode (AT+CFUN=1): ( BS-PA-MFRMS=9 ) ( BS-PA-MFRMS=5) ( BS-PA-MFRMS=2) 0.85 0.95 1.30 mA mA mA Idle mode (AT+CFUN=1): GSM850 EGSM900 DCS1800 PCS1900 12.1 12.1 12.1 12.
Smart Machine Smart Decision 6.9 Electro-Static Discharge SIM800F is an ESD sensitive component, so more attention should be paid to the procedure of handling and packaging. The ESD characteristics are shown in the following table: Table 46: The ESD characteristics (Temperature: 25℃, Humidity: 45 %) Pin Contact discharge Air discharge VBAT ±6KV ±12KV GND ±6KV ±12KV UART1_RXD/TXD ±4KV ±8KV Antenna port ±6KV ±12KV SPKP/ SPKN MICP/ MICN ±3KV ±6KV PWRKEY ±4KV ±8KV 6.
Smart Machine Smart Decision 16 11 ±5 ±6 17 9 ±5 ±6 18 7 ±5 ±6 19-31 5 ±5 ±6 Table 48: SIM800F DCS 1800 and PCS 1900 conducted RF output power DCS 1800 and PCS 1900 PCL Nominal output power (dBm) 29 Tolerance (dB) for conditions Normal Extreme 36 ±2 ±2.
Smart Machine Smart Decision 6.10.2 Module RF Receive Sensitivity The following table shows the module’s conducted receive sensitivity, it is tested under static condition: Table 49: SIM800F conducted RF receive sensitivity Frequency Receive sensitivity（Typical） Receive sensitivity(Max) GSM850 -109dBm -107dBm EGSM900 -109dBm -107dBm DCS1800 -109dBm -107dBm PCS1900 -109dBm -107dBm 6.10.
Smart Machine Smart Decision 7 7.1 Manufacturing Top and Bottom View of SIM800F Figure 46: Top and bottom view of SIM800F 7.2 Typical Solder Reflow Profile Figure 47: Typical Solder Reflow Profile Note: Please refer to“Module secondary-SMT-UGD” for more information about the module shipping and manufacturing. SIM800F_Hardware Design_V1.
Smart Machine Smart Decision 7.1. The Moisture Sensitivity Level The moisture sensitivity level of SIM800 is 3. The module should be mounted within 168 hours after unpacking in the environmental conditions of temperature <30°C and relative humidity of <60% (RH). It is necessary to bake the module if the above conditions are not met.
Smart Machine Smart Decision 8. Appendix I. Related Documents Table 53: Related Documents SN Document name [1] SIM800 Series_AT Command Manual_V1.00.doc [2] ITU-T Draft new recommendation V.25ter: Serial asynchronous automatic dialing and control [3] GSM 07.07: Digital cellular telecommunications (Phase 2+); AT command set for GSM Mobile Equipment (ME) [4] GSM 07.10: Support GSM 07.10 multiplexing protocol GSM 07.
Smart Machine Smart Decision II. Multiplex Function Table 54: Multiplex Function Pin name Pin No.
Smart Machine Smart Decision III.
Smart Machine Smart Decision TE Terminal Equipment, also referred to as DTE TX Transmit Direction UART Universal Asynchronous Receiver & Transmitter URC Unsolicited Result Code USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave Ratio Phonebook abbreviations FD SIM fix dialing phonebook LD SIM last dialing phonebook (list of numbers most recently dialed) MC Mobile Equipment list of unanswered MT calls (missed calls) ON SIM (or ME) own numbers (MSISDNs) list RC Mobil
Smart Machine Smart Decision IV. Safety Caution Table 56: 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 not operate normally because of RF energy interference. Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is switched off.
Smart Machine Smart Decision Contact us: Shanghai SIMCom Wireless Solutions Ltd. Add: SIM Technology Building,No.633,Jinzhong Road,Changning District,Shanghai P.R. China 200335 Tel: +86 21 3235 3300 Fax: +86 21 3235 3301 URL: www.sim.com/wm SIM800F_Hardware Design_V1.
