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SIM802 Hardware Design

2.2 SIM802 functional diagram

The following figure shows a functional diagram of the SIM802 and illustrates the mainly
functional part:

The GSM baseband engine

Flash and SRAM

The GSM radio frequency part

The GSM antenna interface

The SRD radio frequency part

The SRD RF antenna interface

The embedded SIM card IC (optional)

The other external interfaces

Module

POWER

SIM

INTERFACE

MIAN

SERIAL

INTERFACE

AUDIO

INTERFACE

Flash+SRAM

Baseband

Engine

GSM Radio

Frequency

GSM RF

PAD

LCD

INTERFACE

SRD RF

PAD

DEBUG

SERIAL

INTERFACE

Embed SIM

Card

SRD Radio

Frequency

Figure 1: SIM802 functional diagram

SIM802_HD_V2.01

12.01.2010

Summary of Contents for SIM802 HD

Page 1: ...Hardware Design SIM802_HD_V2 01...

Page 2: ...ion of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customer s system integrator All specifications supplied herein are subject t...

Page 3: ...e 32 3 5 1 Battery pack characteristics 33 3 5 2 Recommended battery pack 34 3 5 3 Implemented charging technique 34 3 5 4 Operating modes during charging 35 3 5 5 Charger requirements 36 3 6 Power sa...

Page 4: ...SRD interface 57 3 18 Buzzer 59 4 Antenna interface 60 4 1 Antenna installation 60 4 1 1 Antenna pad 60 4 2 Module RF output power 61 4 3 Module RF receive sensitivity 61 4 4 Module operating frequen...

Page 5: ...17 SIGNAL OF SIM INTERFACE 51 TABLE 18 PIN DESCRIPTION AMPHENOL SIM CARD HOLDER 53 TABLE 19 PIN DESCRIPTION MOLEX SIM CARD HOLDER 53 TABLE 20 PIN DEFINITION OF THE LCD INTERFACE 55 TABLE 21 GPIO OF S...

Page 6: ...ION OF SERIAL PORTS 44 FIGURE 20 CONNECTION OF SOFTWARE UPGRADE 45 FIGURE 21 CONNECTION OF SOFTWARE DEBUG 46 FIGURE 22 RS LEVEL CONVERTER CIRCUIT 46 FIGURE 23 SPEAKER INTERFACE CONFIGURATION 48 FIGURE...

Page 7: ...SIM802 Hardware Design FIGURE 44 TOP VIEW OF SIM802 71 FIGURE 45 THE RAMP SOAK SPIKE REFLOW PROFILE OF SIM802 72 SIM802_HD_V2 01 12 01 2010 7...

Page 8: ...the document This document is intended for the following versions of the SIMCom modules SIM802 A GSM GPRS 900 1800 MHz and 850 1900MHz SRD RF 433MHz Version SIM802 B GSM GPRS 900 1800 MHz and 850 190...

Page 9: ...2 AT command set for GSM Mobile Equipment ME 4 GSM 07 05 Digital cellular telecommunications Phase 2 Use of Data Terminal Equipment Data Circuit terminating Equipment DTE DCE interface for Short Messa...

Page 10: ...l Signal Processor DTE Data Terminal Equipment typically computer terminal printer DTR Data Terminal Ready DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic C...

Page 11: ...evice TDMA Time Division Multiple Access TE Terminal Equipment also referred to as DTE TX Transmit Direction URC Unsolicited Result Code USSD Unstructured Supplementary Service Data VSWR Voltage Stand...

Page 12: ...to all manuals supplied with the product If not so SIMCom does not take on any liability for customer failure to comply with these precautions Switch off the cellular terminal or mobile before boardin...

Page 13: ...es operate over radio frequency signals and cellular networks and cannot be guaranteed to connect in all conditions for example no mobile fee or a invalid SIM card While y ou are in this condition and...

Page 14: ...AT pins z 1 Pin is programmable as General Purpose I O This gives you the flexibility to develop customized applications z Serial port and Debug port can help you easily develop your applications But...

Page 15: ...tation class B Temperature range z Normal operation 30 C to 80 C z Restricted operation 40 C to 30 C and 80 C to 85 C 1 z Storage temperature 45 C to 90 C DATA GPRS CSD z GPRS data downlink transfer m...

Page 16: ...nction Programmable via AT command Physical characteristics Size 33 0 15 x 33 0 15 x 5 15 0 15 mm Weight 10g Firmware upgrade Firmware upgrade over serial interface SRD frequency Bands SIM802 A 433MHz...

Page 17: ...t z The GSM antenna interface z The SRD radio frequency part z The SRD RF antenna interface z The embedded SIM card IC optional z The other external interfaces Module POWER SIM INTERFACE MIAN SERIAL I...

Page 18: ...valuation Board EVB that interfaces the SIM802 directly with appropriate power supply SIM card holder the main serial port and debug serial port handset port LCD optional antenna and all GPIO of the S...

Page 19: ...5 Pin description Power supply Pin Name I O Description DC characteristics Comment VBAT Power 2 VBAT pins are dedicated to connect the supply voltage The power supply of SIM802 has to be a single vol...

Page 20: ...ower off the system the user should keep pressing the key for a moment when power on or power off the system Because the system need margin time assert the software VILmax 0 2 VBAT VIHmin 0 6 VBAT VIm...

Page 21: ...O VILmin 0V VILmax 0 3 2 93V VIHmin 0 7 2 93V VIHmax 2 93V 0 3 VOLmin GND VOLmax 0 2V VOHmin 2 93V 0 2 VOHmax 2 93V If only use TXD RXD GND three pins to communicate RTS Pin connect to GND directly DT...

Page 22: ...e the battery temperature If unused keep pins open SRD interface Pin name I O Description DC characteristics Comment SDA O I I2 C data default for GPIO SCK O I2 C clock default for GPIO NSS O SPI chip...

Page 23: ...epends on network settings and GPRS configuration e g multi slot settings GPRS DATA There is GPRS data in transfer PPP or TCP or UDP In this case power consumption is related with network settings e g...

Page 24: ...mode Connect charger to the module s VCHG Pin and VBAT Pin then press the PWRKEY get a low level voltage for about 2s Charge mode during normal operation Start charging while the module is in normal...

Page 25: ...wer supply of the SIM802 VBAT directly But the Ni_Cd or Ni_MH battery types must be used carefully since their maximum voltage can rise over the absolute maximum voltage for the module and damage it F...

Page 26: ...he voltage is continuously measured at intervals depending on the operating mode The displayed voltage in mV is averaged over the last measuring period before the AT CBC command is executed For detail...

Page 27: ...age for a period time This Pin is pulled up to VBAT in the module The simple circuit illustrates as the following figures 4 7K 47K Turn on impulse PWRKEY Figure 6 Turn on SIM802 using driving circuit...

Page 28: ...apter 3 4 charger can be connected to SIM802 s VCHG Pin regardless of the module s operating mode If the charger is connected to the module s VCHG Pin while SIM802 is in POWER DOWN mode SIM802 will go...

Page 29: ...otocol stack it will return 0 which indicates that the protocol stack is closed Then after 90s SIM802 will power down automatically However during Alarm mode if the software protocol is started by AT...

Page 30: ...the POWER DOWN mode only the RTC is still active POWER DOWN can also be indicated by STATUS Pin which is a low level voltage in this mode STATUS OUTPUT VIL 0 2 VBAT VIH 0 6 VBAT 1000ms Pulldown 500ms...

Page 31: ...e presented OVER VOLTAGE POWER DOWN After this moment no further more AT commands can be executed The module logs off from network and enters POWER DOWN mode and only the RTC is still active POWER DOW...

Page 32: ...WRKEY to a low level voltage for a period time the same as turning on SIM802 using the PWRKEY Pin Before restarting the SIM802 you need delay at least 500ms from detecting the STATUS low level on The...

Page 33: ...ant for the AT command AT CBC to monitor the voltage of battery or the AT CBC may return incorrect battery capacity values z The maximum charging voltage of the Li Ion battery pack is 4 2V and the rec...

Page 34: ...an external voltage system can use this Pin to detect a charger supply and provide most charging current through SIM802 module to battery when charging is in fast charge state The VBAT give out charg...

Page 35: ...harges the battery under constant voltage 3 5 4 Operating modes during charging The battery can be charged during various operating mode That means that when the GSM engine is in Normal mode SLEEP IDL...

Page 36: ...AT command Function AT CALARM Set alarm time AT CCLK Set data and time of RTC AT CPOWD Power down AT CBC Indicated charge state and voltage AT CFUN Start or close the protocol Set AT command AT CFUN...

Page 37: ...will be closed In this case the serial port is still accessible but all AT commands need RF function or SIM card function will not be accessible If SIM802 has been set by AT CFUN 4 then RF function w...

Page 38: ...nal will wake up SIM802 from power saving mode The serial port will be active after DTR changed to low level for about 40mS z Receiving a voice or data call from network to wake up SIM802 z Receiving...

Page 39: ...using PWRKEY No direct transition Alarm mode Use PWRKEY Pin or wait module switch off automatically Use AT CFUN No transition Use AT CFUN let module enter Normal mode then connect the charger to VCHG...

Page 40: ...M802 Hardware Design SIM802_HD_V2 01 12 01 2010 40 Figure 13 RTC supply from non chargeable battery Figure 14 RTC supply from rechargeable battery Figure 15 RTC supply from capacitor z Li battery back...

Page 41: ...han the double layer capacitors resulting in longer backup times Typical charge curves for each cell type are shown in following figures Note that the rechargeable Lithium type coin cells are generall...

Page 42: ...Max Unit Operation temperature 25 70 C Rated operation voltage 3 3 V Charging voltage 3 3 V Nominal capacity discharge capacity 3 3V to 2 0V 0 015 mAh Nominal capacity electrostatic capacity 3 3V to...

Page 43: ...pports bit rates from 1200 bps to 115200bps Main serial port z TXD Send data to the RXD signal line of the DTE z RXD Receive data from the TXD signal line of the DTE Debug serial port z DBG_TXD Send d...

Page 44: ...GPRS service and send AT command of controlling module Also serial port can be used for multiplexing function SIM802 supports only basic mode of multiplexing so far z Serial Port supports the communi...

Page 45: ...n user need to upgrade software and debug software the TXD RXD should be used for software upgrade and the DBG_TXD DBG_RXD for software debugging The PWRKEY Pin is recommended to connect to the IO con...

Page 46: ...S level Please refer to the table 5 for details about the voltage level You should add the level converter IC between the DCE and DTE If you connect it to the computer please refer to the following fi...

Page 47: ...lexers For each channels you can use AT CMIC to adjust the input gain level of microphone use AT SIDET to set the side tone level In addition you can also use AT CLVL to adjust the output gain level o...

Page 48: ...Differential layout 33pF ESD ANTI ESD ANTI MODULE SPK1P SPK1N Figure 23 Speaker interface configuration Differential layout Amplifier Circui t 10pF 10pF 33p F 33pF 33pF Close to speaker GND GND 10pF...

Page 49: ...o Microphone MICxP MICxN GND GND Difference layout AGND MODULE Electret Microphone GND GND 10pF 10pF GND GND ESD ANTI ESD ANTI AGND Figure 25 Microphone interface configuration Figure 26 Earphone inte...

Page 50: ...p dBm load Resistance 27 32 Ohm Single Ended Ref level 0 5477 12 04 Vpp dBm load Resistance 27 32 Ohm Auxiliary Output SPK2 Differential Ref level 1 0954 6 02 Vpp dBm 3 11 SIM interface 3 11 1 SIM car...

Page 51: ...interfaces but the SIM802 module supports embedded SIM IC also if the module has embedded SIM IC SIM card interfaces keep pins open Following is the reference circuit about SIM interface We recommend...

Page 52: ...IM_RST SIM_DATA 22O 22O 22O 22O 22O TVS 220nF MOLEX 91228 GND 22P 22P 22P Figure 27 SIM interface reference circuit with 6 pins SIM card 3 11 3 Design considerations for SIM card holder For 6 pins SIM...

Page 53: ...her is 1 8V 10 Current is about 10mA C2 SIM_RST SIM Card Reset C3 SIM_CLK SIM Card Clock C4 GND Connect to GND C5 VPP Not connect C6 SIM_DATA SIM Card data I O Table 19 Pin description Molex SIM card...

Page 54: ...visit http www molex com for more information about the holder Figure 29 Molex 91228 SIM card holder 3 12 LCD display interface SIM802 provides a serial LCD display interface These are composite pins...

Page 55: ...w voltage level For detail of this AT command please refer to document 1 3 14 ADC SIM802 provide one auxiliary ADC General purpose analog to digital converter as voltage input Pin which can be used to...

Page 56: ...e to HIGH when establish calling 2 Use AT command ATH the RI changes to HIGH SMS When receive SMS The RI will change to LOW and hold low level about 120 ms then change to HIGH URC Some URCs triggers 1...

Page 57: ...M802 is not running 64ms On 800ms SIM802 does not find the network 64ms On 3000ms SIM802 find the network 64ms On 300ms GPRS communication The reference circuitry for you shown as following figure Fig...

Page 58: ...SDA SCL R1 R2 3 3V Figure 33 I2 C application of the SRD interface In the application I2 C SDA and I2 C SCL lines need to be connected to a positive supply voltage via a pull up resistor The reference...

Page 59: ...zzer can be set by AT CRSL The reference circuit for buzzer shown as following figure MODULE 4 7K 47K VBAT BUZZER Figure 35 Reference circuit of Buzzer Table 26 Buzzer output characteristics Parameter...

Page 60: ...rough microstrip line or other type RF trace which impendence must be 50 To help you to ground the antenna SIM802 comes with a grounding plane located close to the antenna pad The antenna pad of SIM80...

Page 61: ...tivity Table 28 SIM802 conducted RF receive sensitivity Frequency Receive sensitivity EGSM900 106dBm GSM850 106dBm DCS1800 106dBm PCS1900 106dBm SRD RF 118dBm 2400bps 4 4 Module operating frequencies...

Page 62: ...mperatures The operating temperature is listed in table32 Table 32 SIM802 operating temperature Parameter Min Type Max Unit Ambient temperature 30 25 80 Restricted operation 40 to 30 80 to 85 Storage...

Page 63: ...0 245 180 mA IVBAT Peak supply current during transmission slot every 4 6ms Power control level for Pout max 2 3 A 5 4 Current consumption The values for current consumption listed refer to following...

Page 64: ...level 15 Typical 113mA Class 10 is default set when the module work at data translation mode the module can also work at class 8 set by AT command 5 5 Electro Static discharge The GSM engine is not p...

Page 65: ...s the mechanical dimensions of SIM802 6 1 Mechanical dimensions of SIM802 Following shows the mechanical dimensions of SIM802 top view side view and bottom view All dimensions are shown in millimeters...

Page 66: ...SIM802 Hardware Design Figure 38 SIM802 side view Figure 39 SIM802 bottom view SIM802_HD_V2 01 12 01 2010 66...

Page 67: ...SIM802 Hardware Design Figure 40 Pad bottom view Following shows the footprint recommendation dimensions of SIM802 SIM802_HD_V2 01 12 01 2010 67...

Page 68: ...ndation Notes Keep out on the user mainboard below the test point and the keep out area as these are solder mask For maintain this module the placement must be keep a distance between the module and o...

Page 69: ...KEY 42 C2D 13 DISP_CLK 43 NRST 14 DISP_DATA 44 GND 15 VRTC 45 GSM_RF 16 DISP_D C 46 GND 17 GND 47 GND 18 MIC2P 48 GND 19 MIC2N 49 GND 20 MIC1N 50 VBAT 21 MIC1P 51 VBAT 22 AGND 52 GPIO 23 SPK1P 53 NETL...

Page 70: ...D DEBUG_TXD RXD TXD STATUS SIM_DATA SIM_CLK SIM_RST SIM_VDD KROW0 RI PWRKEY DISP_CLK DISP_DATA VRTC DISP_D C GND MIC2P MIC2N MIC1N MIC1P AGND SPK1P SPK1N SPK2N SPK2P VCHG TEMP_BAT ADC0 GND GND GND SRD...

Page 71: ...SIM802 Hardware Design Figure 43 Bottom view of SIM802 Figure 44 Top view of SIM802 SIM802_HD_V2 01 12 01 2010 71...

Page 72: ...n 6 3 The ramp soak spike reflow profile of SIM802 If both sides of the mainboard have SMD parts the SIM802 module must be soldered last Figure 45 The ramp soak spike reflow profile of SIM802 SIM802_H...

Page 73: ...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 Fax 86 21 3252 3020 URL www sim com wm...

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