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SIM Tech SIMCom SIM800, Hardware Design

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SIM Tech SIMCom SIM800 Hardware Design Download Page 35

 

                                                                                                                                          Smart Machine Smart Decision

 

SIM800_Hardware Design_V1.09

                                  35                       

                                                          2016-06-30

 

“AT+CMIC” is used to adjust the input gain level of microphone. “AT+SIDET” is used to set the side-tone 
level.  In  addition,  “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.   

 

4.7.1.

 

Speaker Interfaces Configuration 

 

SPKP

Close to speaker

ESD

ESD

10pF

33pF

33pF

33pF

Module

SPKN

10pF

10pF

10pF

33pF

33pF

33pF

10pF

10pF

 

Figure 30: Speaker reference circuit

 

 

4.7.2.

 

Microphone Interfaces Configuration 

 

Electret 

Microphone

The lines in bold type should 

be accorded to differential 

signal layout rules

These components should 

be placed to microphone 

as close as possible

MICP

Module

MICN

ESD

ESD

10pF

33pF

33pF

33pF

10pF

10pF

 

Figure 31: Microphone reference circuit 

 

4.7.3.

 

Audio Electronic Characteristic 

Table 13: Microphone input characteristics 

Parameter   

Min 

Typ 

Max 

Unit 

Mic biasing voltage 

 

1.9 

2.2 

V 

Summary of Contents for SIMCom SIM800

Page 1: ...SIM800_Hardware Design_V1 09...

Page 2: ...customer s possession Furthermore system validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customer s system integrator...

Page 3: ...Mode 26 4 3 2 Sleep Mode AT CSCLK 1 26 4 3 3 Wake Up SIM800 from Sleep Mode AT CSCLK 1 27 4 4 RTC Backup 27 4 5 Serial Port and USB Interface 28 4 5 1 Function of Serial Port 29 4 5 2 Serial Port 29 4...

Page 4: ...rical Reliability and Radio Characteristics 53 6 1 Absolute Maximum Ratings 53 6 2 Recommended Operating Conditions 53 6 3 Digital Interface Characteristics 53 6 4 SIM Card Interface Characteristics 5...

Page 5: ...F THE KEYPAD INTERFACE 43 TABLE 21 PIN DEFINITION OF THE I2C 44 TABLE 22 PIN DEFINITION OF THE GPIO 44 TABLE 23 PIN DEFINITION OF THE ADC 45 TABLE 24 ADC SPECIFICATION 45 TABLE 25 PIN DEFINITION OF TH...

Page 6: ...e Design_V1 09 6 2016 06 30 TABLE 47 OPERATING FREQUENCIES 57 TABLE 48 MOISTURE CLASSIFICATION LEVEL AND FLOOR LIFE 59 TABLE 49 BAKING REQUIREMENTS 59 TABLE 50 RELATED DOCUMENTS 60 TABLE 51 TERMS AND...

Page 7: ...30 FIGURE 21 ISOLATION CIRCUIT BY DIODES 31 FIGURE 22 TX LEVEL CONVERTING BY TRANSISTOR 31 FIGURE 23 RX LEVEL CONVERTING BY TRANSISTOR 31 FIGURE 24 USB REFERENCE CIRCUIT 32 FIGURE 25 CONNECTION FOR SO...

Page 8: ...Design_V1 09 8 2016 06 30 FIGURE 47 GSM SIMPLE ANTENNA MATCHING CIRCUIT 49 FIGURE 48 BLUETOOTH ANTENNA MATCHING CIRCUIT 50 FIGURE 49 RECOMMENDED PCB LAYOUT 52 FIGURE 50 TOP AND BOTTOM VIEW OF SIM800 5...

Page 9: ...100nF capacitor changed Ma Honggang 2014 07 18 1 06 Update figure 12 and 13 timing of VDD_EXT changed Update the baudrate that SIM800 supports Rename some pin name to follow the SIMCom naming rules Up...

Page 10: ...ads One full function UART port and can be configured to two independent serial ports One USB port can be used as debugging and firmware upgrading Audio channels which include a microphone input and a...

Page 11: ...es Half Rate ETS 06 20 Full Rate ETS 06 10 Enhanced Full Rate ETS 06 50 06 60 06 80 Adaptive multi rate AMR Echo Cancellation Noise Suppression Serial port and USB interface Serial port Full modem int...

Page 12: ...ion depends on network settings such as DTX off on FR EFR HR hopping sequences antenna GPRS STANDBY Module is ready for GPRS data transfer but no data is currently sent or received In this case power...

Page 13: ...figure shows a functional diagram of SIM800 GSM baseband engine PMU RF part Antenna interfaces Other interfaces Analog Baseband Digital Baseband Power Management Unit Radio Frequency Power Supply Anal...

Page 14: ...Smart Machine Smart Decision SIM800_Hardware Design_V1 09 14 2016 06 30 3 Package Information 3 1 Pin Out Diagram Figure 2 SIM800 pin out diagram Top view...

Page 15: ...itor e g 4 7uF VDD_EXT 15 O 2 8V power output Keep floating if unused GND 2 17 18 29 3 9 45 46 54 5 8 59 61 62 6 3 64 65 Ground GND for VBAT recommend to use 62 63 64 65 pin Power on off PWRKEY 1 I PW...

Page 16: ...grading Keep floating if unused USB_DP 27 I O USB_DN 28 I O ADC ADC 25 I 10 bit general analog to digital converter Keep floating if unused PWM PWM0 35 O Pulse width modulation multiplex with GPIO Kee...

Page 17: ...n_V1 09 17 2016 06 30 BT_ANT 53 I O Bluetooth antenna port Impendence must be controlled to 50 RF synchronization RF_SYNC 67 O RF burst synchronous signal Do not pull up Other signal RESET 16 I Reset...

Page 18: ...Smart Machine Smart Decision SIM800_Hardware Design_V1 09 18 2016 06 30 3 3 Package Dimensions Figure 3 Dimensions of SIM800 Unit mm...

Page 19: ...Smart Machine Smart Decision SIM800_Hardware Design_V1 09 19 2016 06 30 Figure 4 Recommended PCB footprint outline Unit mm Note Keep copper out of area B and C...

Page 20: ...mW 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 to SIM800 VBAT pins as possible VBAT 5 1...

Page 21: ...ver 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 150m The following figure shows the VBAT voltage...

Page 22: ...is 3 0V 4 1 2 Monitoring Power Supply The AT command AT CBC can be used to monitor the VBAT voltage For details please refer to document 1 4 2 Power on off SIM800 4 2 1 Power on SIM800 User can power...

Page 23: ...ory After the configuration is saved as fixed baud rate the Code RDY should be received from the serial port every time when SIM800 is powered on For details please refer to the chapter AT IPR in docu...

Page 24: ...d 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 Before the completion of the power o...

Page 25: ...he module so the external isolation is not necessary Following figure is internal circuit of the RESET pin 2 8V RESET Circuit 4 7K RESET Module 47K Figure 14 Reset circuit The typical value of RESET p...

Page 26: ...fault AT CFUN 4 Flight mode disable RF function Table 7 The current consumption of function modes BS PA MFRMS 5 Fun Current consumption mA CSCLK 1 0 0 8 1 1 3 4 0 8 Minimum function mode minimizes the...

Page 27: ...a call from network Receive a SMS from network Receive external interrupt 4 4 RTC Backup VRTC is an input pin when the VBAT is not supplied by external power When the VBAT power supply is in present a...

Page 28: ...ule and client DTE Table 8 Serial port and USB pin definition Note Hardware flow control is disabled by default The AT command AT IFC 2 2 can enable hardware flow control The AT command AT IFC 0 0 can...

Page 29: ...of the host device Pay more attention to the following requirements Synchronization between DTE and DCE When DCE powers on with autobauding enabled firstly user must send character A or a to synchroni...

Page 30: ...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 1K 5 6K RXD TXD RTS CTS GPIO GPIO EINT DTE 3 3V 5 6K...

Page 31: ...he following reference circuits VDD_EXT 4 7K 47K UART1_TXD 4 7K Module VDD_EXT RXD VDD DTE Figure 22 TX level converting by transistor VDD_EXT 4 7K 47K 4 7K DTE UART1_RXD Module VDD_EXT TXD VDD Figure...

Page 32: ...USB and UART interfaces can be used for firmware upgrade If customer upgrading firmware via the USB port SIM800 must be powered first then connect USB_VBUS USB_DP USB_DN and GND to PC There is no nee...

Page 33: ...of the following events occur the pin will be changed to high 1 Establish the call 2 Hang up the call Data call The pin is changed to low When any of the following events occur the pin will be changed...

Page 34: ...as caller the RI will remain high Please refer to the following figure HIGH LOW Idle Ring Establish the call Hang up the call Idle RI Figure 29 RI behaviour as a caller 4 7 Audio Interfaces SIM800 pr...

Page 35: ...s as shown in following figures 4 7 1 Speaker Interfaces Configuration SPKP Close to speaker ESD ESD 10pF 33pF 33pF 33pF Module SPKN 10pF 10pF 10pF 33pF 33pF 33pF 10pF 10pF Figure 30 Speaker reference...

Page 36: ...ay from RF cable antenna and VBAT pin The bypass capacitor for filtering should be placed near module and another group placed near to connector Conducting noise is mainly caused by the VBAT drop If A...

Page 37: ...LEX 91228 SIM Card 22PF 4 7K VDD_EXT VCC GND RST VPP CLK I O GND 51R 51R 22PF 22PF Figure 32 Reference circuit of the 8 pin SIM card holder The SIM_DET pin is used for detection of the SIM card hot pl...

Page 38: ...SIM card holder should far away from GSM antenna while in PCB layout SIM traces should keep away from RF lines VBAT and high speed signal lines The traces should be as short as possible Keep SIM hold...

Page 39: ...scription C1 SIM_VDD SIM card power supply 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 D...

Page 40: ...Signal Description C1 SIM_VDD SIM card power supply C2 SIM_RST SIM card reset C3 SIM_CLK SIM card clock C5 GND Connect to GND C6 VPP Not connect C7 SIM_DATA SIM card data I O 4 10 PCM Interface SIM800...

Page 41: ...PCMSYNC PCMOUT PCMCLK GND GND PCM_IN PCM_OUT PCM_SYNC PCM_CLK Figure 36 PCM reference circuit 4 11 Keypad Interface SIM800 consists of 5 keypad column outputs and 5 keypad row inputs and it can suppor...

Page 42: ...d KBCs and KBRs as GPIO for details please see the document 1 Module supports a new keypad connection it can support 5 5 2 amount 50 keypads meet full keyboard demand and the connection diagram is as...

Page 43: ...on same KBC and KBR when implement the extended keypad design The following figure is an example to explain this situation CTRL and A can not be recognized if the two buttons were pressed at the same...

Page 44: ...e drive write and I O configuration Table 21 Pin definition of the I2C Note I2C has been pulled up to 2 8V via 4 7K inside 4 13 General Purpose Input Output GPIO SIM800 provides 2 GPIO pins The output...

Page 45: ...able 24 ADC specification Parameter Min Typ Max Unit Voltage range 0 2 8 V ADC Resolution 10 bits Sampling rate 1 0833 MHz ADC precision 10 30 mV Note the voltage should less than 2 8V or the ADC may...

Page 46: ...eristics Parameter Min Typ Max Unit Working voltage 2 5 2 8 2 9 V Working current 4 16 mA Note PWM pin must keep low when module in the boot process Table 27 PWM multiplex function Pin name Pin number...

Page 47: ...Reference circuit of NETLIGHT 4 17 Operating Status Indication The STATUS pin indicates the operating status of module The pin output high when module power on output is low when module powered off T...

Page 48: ..._SYNC pin Note Do not pull up RF_SYNC The timing of the synchronization signal is shown in the following figure High level of the RF_SYNC signal indicates increased power consumption during transmissi...

Page 49: ...ly to achieve the best performance so the matching circuit is necessary For the purpose of static electricity we recommend to add D101 which is a TVS the recommendation ESD component as table 38 The c...

Page 50: ...BT_ANT to connect a Bluetooth antenna The Bluetooth antenna must be matched properly to achieve best performance so the matching circuit is necessary the connection is recommended as the following fi...

Page 51: ...ces The RF connector is used for conducted test so keep it as close to the GSM_ANT pin as possible Antenna matching circuit should be closed to the antenna Keep the RF traces as 50 The RF traces shoul...

Page 52: ...o should far away from antenna and power and it is recommended to surround audio traces by ground And do not rout audio trace and VBAT trace parallel 5 2 5 Others It s better to trace signal lines of...

Page 53: ...parameters are for digital interface pins such as keypad GPIO I2C UART LCD and PCM 6 2 Recommended Operating Conditions Table 36 Recommended operating conditions Symbol Parameter Min Typ Max Unit VBA...

Page 54: ...7 V VOL Low level output voltage 0 36 V 0 4 V 6 5 SIM_VDD Characteristics Table 39 SIM_VDD characteristics Symbol Parameter Min Typ Max Unit VO Output voltage 3 0 V 1 8 IO Output current 10 mA 6 6 VDD...

Page 55: ...1 2 1 3 2 0 mA Idle mode AT CFUN 1 EGSM900 22 1 mA Voice call PCL 5 GSM850 EGSM900 DCS1800 PCS1900 204 8 203 9 133 1 137 9 mA Data mode GPRS 1Rx 4Tx GSM850 EGSM900 DCS1800 PCS1900 450 9 457 3 281 8 2...

Page 56: ...discharge VBAT 5KV 10KV GND 5KV 10KV RXD TXD 4KV 8KV GSM_ANT 5KV 10KV SPKP SPKN MICP MICN 4KV 8KV PWRKEY 4KV 8KV 6 10 Radio Characteristics The following table shows the module conducted output power...

Page 57: ...0 conducted receive sensitivity it is tested under static condition Table 46 Conducted RF receive sensitivity Frequency Receive sensitivity Typical Receive sensitivity Max GSM850 EGSM900 108dBm 106dBm...

Page 58: ...Manufacturing 7 1 Top and Bottom View of SIM800 Figure 50 Top and Bottom View of SIM800 7 2 Typical Solder Reflow Profile Figure 51 Typical Solder Reflow Profile Note Please refer to Module secondary...

Page 59: ...If the vacuum package is not open for 6 months or longer than the packing date baking is also recommended before re flow soldering 2 For product handling storage processing IPC JEDEC J STD 033 must b...

Page 60: ...ice SMS and Cell Broadcast Service CBS 6 GSM 11 14 Digital cellular telecommunications system Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity Module Mobile Equipment S...

Page 61: ...Rate GPRS General Packet Radio Service GSM Global Standard for Mobile Communications HR Half Rate IMEI International Mobile Equipment Identity Li ion Lithium Ion MO Mobile Originated MS Mobile Statio...

Page 62: ...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...

Page 63: ...e a safety hazard Your cellular terminal or mobile receives and transmits radio frequency energy while switched on RF interference can occur if it is used close to TV sets radios computers or other el...

Page 64: ...dware Design_V1 09 64 2016 06 30 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...

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