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SimCom SIM808, Hardware Design

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SimCom SIM808 Hardware Design Download Page 20

 

                                                                                                                                                  Smart Machine Smart Decision                        

4

 

GSM Application Interface 

4.1

 

Power Supply 

The power supply range of SIM808 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. 
 
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 SIM808 VBAT pins. 

 

Figure 5: Reference circuit of the VBAT input 

Table 6: Recommended Zener diode 

 

Vendor 

Part number 

Power(watts) 

Packages 

1 

On semi 

MMSZ5231BT1G 

500mW 

SOD123 

2 

Prisemi 

PZ3D4V2H 

500mW 

SOD323 

3 

Prisemi 

PZ5D4V2H 

500mW 

SOD523 

4 

Vishay 

MMSZ4689-V 

500mW 

SOD123 

5 

Crownpo 

CDZ55C5V1SM 

500mW 

0805 

 
The following figure is the reference design of +5V input power supply. The designed output for the power 
supply is 4.1V, thus a linear regulator can be used. 

SIM808_Hardware Design_V1.00                                                               2014.03.27 

20

 

Figure 6: Reference circuit of the LDO power supply

 

Summary of Contents for SIM808

Page 1: ...SIM808_Hardware Design_V1 00...

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: ...eset Function 25 4 3 Power Saving Mode 26 4 3 1 Function Mode 27 4 3 2 Sleep Mode AT CSCLK 1 27 4 3 3 Wake Up SIM808 from Sleep Mode AT CSCLK 1 27 4 4 Charging Interface 28 4 4 1 Battery Pack Characte...

Page 4: ...Power on down Scenarios 53 5 2 1 Power on GPS engine 53 5 2 2 Power down GPS engine 53 5 3 GPS Antenna Interface 53 5 3 1 GPS Antenna Interface 53 5 3 2 GPS Antenna Choice Consideration 53 6 Electric...

Page 5: ...TERISTICS 38 TABLE 17 SIM PIN DEFINITION 40 TABLE 18 PIN DESCRIPTION MOLEX SIM CARD HOLDER 42 TABLE 19 PIN DESCRIPTION AMPHENOL SIM CARD HOLDER 42 TABLE 20 PCM PIN DEFINITION 43 TABLE 21 PCM PIN SPECI...

Page 6: ...HUMIDITY 45 57 TABLE 47 SIM808 GSM 900 AND GSM 850 CONDUCTED RF OUTPUT POWER 58 TABLE 48 SIM808 DCS 1800 AND PCS 1900 CONDUCTED RF OUTPUT POWER 58 TABLE 49 SIM808 CONDUCTED RF RECEIVE SENSITIVITY 59...

Page 7: ...O XH414H IV01E CHARGE DISCHARGE CHARACTERISTIC 31 FIGURE 22 CONNECTION OF THE SERIAL PORT 32 FIGURE 23 LEVEL CONVERTING BY RESISTOR 33 FIGURE 24 ISOLATION CIRCUIT BY DIODES 33 FIGURE 25 TX LEVEL CONVE...

Page 8: ...7 8 FIGURE 48 REFERENCE CIRCUIT OF NETLIGHT 50 FIGURE 49 RF_SYNC SIGNAL DURING TRANSMIT BURST 51 FIGURE 50 GSM ANTENNA MATCHING CIRCUIT 51 FIGURE 51 GPS ANTENNA MATCHING CIRCUIT 53 FIGURE 52 TOP AND B...

Page 9: ...Smart Machine Smart Decision SIM808_Hardware Design_V2 00 8 2014 03 27 Version History Date Version Description of change Author 2014 03 27 1 00 Origin ShengWu Sun Xuegang Wang...

Page 10: ...e PDA tracker and other mobile devices SIM808 has 68 SMT pads and provides all hardware interfaces between the module and customers boards z Support 4 4 2 keypads z One full modem serial port z One US...

Page 11: ...structured Supplementary Services Data USSD support SMS z MT MO CB Text and PDU mode z SMS storage SIM card SIM interface Support SIM card 1 8V 3V External antenna Antenna pad Audio features Speech co...

Page 12: ...eleration 4 G Hot start 1 s Warm start 28 s Time To First Fix 3 Cold start 30 s Autonomous acquisition cold start 147 dBm Re acquisition 159 dBm Sensitivity Tracking 165 dBm Channels 22 66 Update rate...

Page 13: ...r received In this case power consumption depends on network settings and GPRS configuration GPRS DATA There is GPRS data transfer PPP or TCP or UDP in progress In this case power consumption is relat...

Page 14: ...following figure shows a functional diagram of SIM808 z The GSM baseband engine z The GPS engine z Flash z The GSM radio frequency part z The antenna interface z The other interfaces Figure 1 SIM808...

Page 15: ...Smart Machine Smart Decision 3 Package Information 3 1 Pin out Diagram Figure 2 SIM808 pin out diagram Top view SIM808_Hardware Design_V1 00 2014 03 27 15...

Page 16: ...7uF VDD_EXT 7 O 2 8V power output Keep floating if unused GND 1 2 3 18 28 34 36 40 51 52 5 4 64 65 67 68 Ground Recommend connecting 1 2 3pin to the power GND Power on off PWRKEY 8 I PWRKEY should be...

Page 17: ...unused PWM PWM1 42 O Pulse width modulation multiplex with GPIO4 PWM2 41 O Pulse width modulation multiplex with GPIO3 Keep floating if unused I2C SDA 38 I O I2C serial bus data SCL 39 O I2C serial bu...

Page 18: ...r signal RESET 16 I Reset input Active low 1PPS 37 I Time Mark outputs timing pulse related to receiver time If unused keep open 3 3 Package Dimensions Figure 3 Dimensions of SIM808 Unit mm SIM808_Har...

Page 19: ...Smart Machine Smart Decision Figure 4 Recommended PCB footprint outline Unit mm SIM808_Hardware Design_V1 00 2014 03 27 19...

Page 20: ...ecommended the diode can prevent chip from damaging by the voltage surge These capacitors and Zener diode should be placed as close as possible to SIM808 VBAT pins Figure 5 Reference circuit of the VB...

Page 21: ...mum power transmit phase and the test condition is as following VBAT 4 0V A VBAT bypass capacitor CA 100 F tantalum capacitor ESR 0 7 Another VBAT bypass capacitor CB 1 F Figure 8 VBAT voltage drop du...

Page 22: ...refer to document 1 4 2 Power on down SIM808 4 2 1 Power on SIM808 4 2 1 1 Turn on SIM808 Using the PWRKEY Pin Power on User can power on SIM808 by pulling down the PWRKEY pin for at least 1 second a...

Page 23: ...d baud rate and save the configuration to non volatile flash memory After the configuration is saved as fixed baud rate the Code RDY should be received from the serial port every time when SIM808 is p...

Page 24: ...s 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 down procedure th...

Page 25: ...l constantly monitor the temperature of the module If the temperature 80 the following URC will be reported CMTE 1 If the temperature 30 the following URC will be reported CMTE 1 If the temperature 85...

Page 26: ...V VIL 0 6 V RESET Tpull down 105 mS The reset scenarios are illustrated in the following figures Figure 16 Reset timing sequence 4 3 Power Saving Mode User can control SIM808 module to enter or exit t...

Page 27: ...t the AT Command AT CFUN fun please refer to document 1 4 3 2 Sleep Mode AT CSCLK 1 When the GPS function is shut off user can control SIM808 module to enter or exit the sleep mode AT CSCLK 1 by DTR s...

Page 28: ...charging z The battery pack should have a protection circuit to avoid overcharging deep discharging and over current and the circuit should be insensitive to pulsed current z The internal resistance...

Page 29: ...ge DDLO is the state of battery when its voltage is under 2 2V And UVLO means the battery voltage is less than 3 3V and more than 2 2V The battery is not suitable for fast charging when its condition...

Page 30: ...not supplied for the system Current output for backup battery when the VBAT power supply is in present and the backup battery is in low voltage state The RTC power supply of module can be provided by...

Page 31: ...Serial port and USB pin definition Name Pin number Function DTR 9 Data terminal ready RI 10 Ring indicator DCD 11 Data carrier detect CTS 12 Clear to send RTS 13 Request to send TXD 14 Transmit data...

Page 32: ...aracter A or a to synchronize the baud rate It is recommended to send AT until DTE receives the OK response which means DTE and DCE are correctly synchronized For more information please refer to the...

Page 33: ...odes Note when a diode used to isolate voltage cross customer should notice that there s voltage drop on the diode And the signal s voltage level should meet the customer s electrical character The re...

Page 34: ...bug function When power on the module connect VBUS USB_DP USB_DM and GND to PC then install the driver successfully a UART port could be recognized by the PC customer could achieve the software Debug...

Page 35: ...er should be added between the DCE and DTE For details about software upgrading please refer to document 4 4 7 RI Behaviors Table 13 RI Behaviors State RI response Standby High Voice call The pin is c...

Page 36: ...be used for electret microphone The module also provides one analog output The output can directly drive 32 receiver Table 14 Audio interface definition Pin name Pin number Function MIC1P 19 Main Aud...

Page 37: ...terface Configuration SIM808_Hardware Design_V1 00 2014 03 27 37 SPK1P SPK1N 10pF 10pF 10pF 33pF 33pF 33pF ESD ANTI ESD ANTI These components should be placed to speaker as close as possible The lines...

Page 38: ...se has great relatives with PCB layout Under some scenarios TDD noise from GSM 900MHz frequency affects heavily but some different story is from GSM1800MHz fervency so customer should develop this fil...

Page 39: ...r voice with transmission 4 9 1 Bluetooth Antenna Interface The module provides a Bluetooth antenna interface named ANT_BT External antenna must be matched properly to achieve best performance so the...

Page 40: ...n SIM card holder is illustrated in the following figure Figure 36 Reference circuit of the 8 pin SIM card holder The SIM_PRESENCE pin is used for detection of the SIM card hot plug in User can select...

Page 41: ...should be as short as possible z Keep SIM holder s GND connect to main ground directly z Shielding the SIM card signal by ground well z Recommended to place a 1uF capacitor on VSIM line and keep close...

Page 42: ...t 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 Figure 39 Amphenol C707 10M0...

Page 43: ...g sync both support Zero Padding Sign extensi on Default Zero Padding Data Ordering MSB LSB both support Note User can use AT command control PCM interface for details please refer to document 1 4 11...

Page 44: ...ed AT application For details about embedded AT application please refer to document 1 Refer to the following figure for SPI design DISP_D C DISP_CS SPI_D C SPI_CS SPI_CLK DISP_CLK SPI_DATA DISP_DATA...

Page 45: ...nsists of 4 keypad column outputs and 4 keypad row inputs and it can support two kinds of connections the traditional 4 4 keypad matrix and the extended 4 4 2 keypad matrix Figure 43 Traditional keypa...

Page 46: ...the connection diagram is shown in follow figure as an example ROWx COLx 1K 20K Figure 45 Enhance the ESD performance of keypad circuit Module can detect two buttons pressed synchronously at both the...

Page 47: ...Keypad multiplex function Pin name Pin number Mode 0 default Mode 1 COL0 62 COL0 GPIO18 COL1 61 COL1 GPIO17 COL2 60 COL2 GPIO16 COL3 59 COL3 GPIO15 ROW0 58 ROW0 GPIO14 ROW1 57 ROW1 GPIO13 ROW2 56 ROW2...

Page 48: ..._Hardware Design_V1 00 2014 03 27 48 Note I2C has been pulled up to 2 8V via 4 7K Table 26 I2C multiplex function Pin name Pin number Mode 0 default Mode 1 SCL 39 SCL GPIO2 SDA 38 SDA GPIO1 4 13 1 Gen...

Page 49: ...nously if customer set PIN 42 as PWM so PIN41 can only be used as GPIO PWM output frequency varies from 0 to 2KHz Two 7 bit unsigned binary parameters are used for the output period and for the duty c...

Page 50: ...ble 34 Status of the NETLIGHT pin Status SIM808 behavior Off SIM808 is not running 64ms On 800ms Off SIM808 not registered the network 64ms On 3000ms Off SIM808 registered to the network 64ms On 300ms...

Page 51: ...port is named RF_ANT The impedance should be 50 VSWR should be less than 2 It is recommended that GSM antenna and Bluetooth antenna be placed as far as better to keep the isolations more than 30dB The...

Page 52: ...NOS GAGAN MSAS The GPS NMEA information is output by serial port The default baud rate is 115200bps The GPS engine is controlled by GSM engine so when it is necessary to run GPS the GSM engine must be...

Page 53: ...s 50 impedance controlled line in PCB layout 5 3 2 GPS Antenna Choice Consideration To obtain excellent GPS reception performance a good antenna will always be required The antenna is the most critica...

Page 54: ...the end of the ground plane and will require several millimeters of clearance between the closest component It is important to note that use of a LP antenna will result in a minimum of 3dB of gain los...

Page 55: ...ital interface characteristics Symbol Parameter Min Typ Max Unit IIH High level input current 10 10 uA IIL Low level input current 10 10 uA VIH High level input voltage 2 4 V VIL Low level input volta...

Page 56: ...Min Typ Max Unit VO Output voltage 2 70 2 80 2 95 V IO Output current 50 mA 6 7 VRTC Characteristics Table 44 VRTC characteristics Symbol Parameter Min Typ Max Unit VRTC IN VRTC input voltage 2 8 V I...

Page 57: ...VBAT Average current Data mode GPRS 4Rx 1Tx GSM850 EGSM900 DCS1800 PCS1900 221 25 220 62 158 01 158 62 mA mA IMAX Peak current During TX burst 2 0 A In above table the current consumption value is the...

Page 58: ...lowed by the 3GPP TS 05 05 technical specification requirement Table 47 SIM808 GSM 900 and GSM 850 conducted RF output power GSM 900 and EGSM 850 Tolerance dB for conditions PCL Nominal output power d...

Page 59: ...rance should not exceed 2dB under normal condition and 2 5dB under extreme condition At DCS1800 and PCS1900 band the module is a class 1 device so the module s output power should not exceed 30dBm and...

Page 60: ...ng table shows the module s operating frequency range it is followed by the 3GPP TS 05 05 technical specification requirement Table 50 SIM808 operating frequencies Frequency Receive Transmit GSM850 86...

Page 61: ...IM808 Figure 52 Top and Bottom View of SIM808 7 2 Typical Solder Reflow Profile Figure 53 Typical Solder Reflow Profile Note Please refer to Module secondary SMT UGD for more information about the mod...

Page 62: ...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 63: ...T User Guide 11 ITU T Draft new recommendation V 25ter Serial asynchronous automatic dialing and control 12 GSM 07 07 Digital cellular telecommunications Phase 2 AT command set for GSM Mobile Equipmen...

Page 64: ...tion Standard FR Full Rate GPRS General Packet Radio Service GSM Global Standard for Mobile Communications GPS Global Positioning System GAGAN The GPS Aided Geo Augmented Navigation HR Half Rate IMEI...

Page 65: ...y interference Switch off the cellular terminal or mobile before boarding an aircraft Make sure it is switched off The operation of wireless appliances in an aircraft is forbidden to prevent interfere...

Page 66: ...In order to make or receive calls the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength Some networks do not allow for emergency call if cer...

Page 67: ...ardware Design_V1 00 2014 03 27 67 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 3252 3300 F...

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