SIMCOM900命令手册

1、SIMCOM900命令手册aSIM900A_Hardware Design_V1.00Document Title:SIM900A Hardware DesignVersion: 1.00Date:2010-08-23Status:ReleaseDocument Control ID:SIM900A_Hardware Design V1.00General NotesSIMCom offers this information as a service to its customers, to support application and engineering efforts that u

2、se 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 customers possession. Furthermo

3、re, system validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the customer or the customers system integrator. All specifications supplied herein are subject to change.CopyrightThis document contains proprietary technical information which i

4、s the property of SIMCom Limited, copying of this document and giving it to others and the using or communication of the contents thereof, are forbidden without express authority. Offenders are liable to the payment of damages. All rights reserved in the event of grant of a patent or the registratio

5、n of a utility model or design. All specification supplied herein are subject to change without notice at any time.Copyright ? Shanghai SIMCom Wireless Solutions Ltd. 2010ContentsContents (3)Version history (8)1 Introduction (9)3.10 LCD Display Interface (43)3.11 Keypad Interface (44)3.12 ADC (45)3.

6、13 Behaviors of the RI (45)3.14 Network Status Indication (47)3.15 General Purpose Input Output (GPIO) (47)3.16 External Reset (48)3.17 PWM (49)Table IndexTABLE 1: RELATED DOCUMENTS (9)TABLE 2: TERMS AND ABBREVIATIONS (10)TABLE 3: SIM900A KEY FEATURES (14)TABLE 4: CODING SCHEMES AND MAXIMUM NET DATA

7、 RATES OVER AIR INTERFACE (16)TABLE 5: PIN DESCRIPTION (18)TABLE 6: OVERVIEW OF OPERATING MODES (22)Figure IndexFIGURE 1: SIM900A FUNCTIONAL DIAGRAM (16)FIGURE 2: TOP VIEW OF SIM900A EVB (17)FIGURE 3: REFERENCE CIRCUIT OF THE VBAT INPUT (23)FIGURE 4: REFERENCE CIRCUIT OF THE SOURCE POWER SUPPLY INPU

8、T (23)FIGURE 5: VBAT VOLTAGE DROP DURING TRANSMIT BURST (24)FIGURE 6: THE MINIMAL VBAT VOLTAGE AT VBAT DROP (24)FIGURE 43: SIM900A PIN OUT DIAGRAM (TOP VIEW) (58)FIGURE 44: THE RAMP-SOAK-SPIKE REFLOW PROFILE OF SIM900A (60)Version historyVersion Description of change Author 2010-08-23 1.00 Origin Li

9、Gang1 IntroductionThis document describes the hardware interface of the SIMCom SIM900A module that connects to the specific application and the air interface. As SIM900A can be integrated into a wide range of applications, all functional components of SIM900A are described in great detail.SN Documen

10、t name Remark1 SIM900A_ATC SIM900A_ATC2 ITU-T Draft newrecommendationV.25ter:Serial asynchronous automatic dialing and control3 GSM 07.07: Digital cellular telecommunications (Phase 2+); AT command set for GSMMobile Equipment (ME)4 GSM 07.10: Support GSM 07.10 multiplexing protocol5 GSM 07.05: Digit

11、al cellular telecommunications (Phase 2+); Use of Data TerminalEquipment Data Circuit terminating Equipment (DTE DCE) interface forShort Message Service (SMS) and Cell Broadcast Service (CBS)6 GSM 11.14: Digital cellular telecommunications system (Phase 2+); Specification of the SIMApplication Toolk

12、it for the Subscriber Identity Module Mobile Equipment(SIM ME) interface7 GSM 11.11: Digital cellular telecommunications system (Phase 2+); Specification of theSubscriber Identity Module Mobile Equipment (SIM ME) interface8 GSM 03.38: Digital cellular telecommunications system (Phase 2+); Alphabets

13、andlanguage-specific information9 GSM 11.10 Digital cellular telecommunications system (Phase 2)； Mobile Station (MS)conformance specification；Part 1: Conformance specification10 AN_Serial Port AN_Serial Port1.2 Terms and AbbreviationsTable 2: Terms and AbbreviationsDescriptionADC Analog-to-Digital

14、ConverterAMR Adaptive Multi-RateARP Antenna Reference PointASIC Application Specific Integrated CircuitBER Bit Error RateBTS Base Transceiver StationCHAP Challenge Handshake Authentication ProtocolCS Coding SchemeCSD Circuit Switched DataCTS Clear to SendDAC Digital-to-Analog ConverterDRX Discontinu

15、ous ReceptionDSP Digital Signal ProcessorDTE Data Terminal Equipment (typically computer, terminal, printer) DTR Data Terminal ReadyDTX Discontinuous TransmissionEFR Enhanced Full RateEGSM Enhanced GSMEMC Electromagnetic CompatibilityESD Electrostatic DischargeETS European Telecommunication Standard

16、FCC Federal Communications Commission (U.S.)FDMA Frequency Division Multiple AccessFR Full RateGMSK Gaussian Minimum Shift KeyingGPRS General Packet Radio ServiceGSM Global Standard for Mobile CommunicationsHR Half RateI/O Input/OutputIC Integrated CircuitIMEI International Mobile Equipment Identity

17、kbps Kilo bits per secondDescriptionLED Light Emitting DiodeLi-Ion Lithium-IonMO Mobile OriginatedMS Mobile Station (GSM engine), also referred to as TE MT Mobile TerminatedPAP Password Authentication ProtocolPBCCH Packet Switched Broadcast Control ChannelPCB Printed Circuit BoardPDU Protocol Data U

18、nitPPP Point-to-point protocolRF Radio FrequencyRMS Root Mean Square (value)RTC Real Time ClockRX Receive DirectionSIM Subscriber Identification ModuleSMS Short Message ServiceTDMA Time Division Multiple AccessTE Terminal Equipment, also referred to as DTETX Transmit DirectionUART Universal Asynchro

19、nous Receiver & Transmitter URC Unsolicited Result CodeUSSD Unstructured Supplementary Service DataVSWR Voltage Standing Wave RatioVmax Maximum Voltage ValueVnorm Normal Voltage ValueVmin Minimum Voltage ValueVIHmax Maximum Input High Level Voltage ValueVIHmin Minimum Input High Level Voltage ValueV

20、ILmax Maximum Input Low Level Voltage Value VILmin Minimum Input Low Level Voltage ValueVImax Absolute Maximum Input Voltage ValueVImin Absolute Minimum Input Voltage Value VOHmax Maximum Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level V

21、oltage Value VOLmin Minimum Output Low Level Voltage ValueInorm Normal CurrentDescriptionImax Maximum Load CurrentPhonebook abbreviationsFD SIM fix dialing phonebookLD SIM last dialing phonebook (list of numbers most recently dialed)MC Mobile Equipment list of unanswered MT calls (missed calls)ON SI

22、M (or ME) own numbers (MSISDNs) listRC Mobile Equipment list of received callsSM SIM phonebookNC Not connect1.3 Safety CautionThe following safety precautions must be observed during all phases of the operation. Usage, service or repair of any cellular terminal or mobile incorporating SIM900A module

23、. Manufactures of the cellular terminal should send words of the following safety information to users and operating personnel and to incorporate these guidelines into all manuals supplied with the product. If not so, SIMCom does not take on any liability for customer failure to comply with these pr

24、ecautions.When in a hospital or other health care facility, observe the restrictions about theuse of mobiles. Switch the cellular terminal or mobile off, medical equipment may be sensitiveto not operate normally for RF energy interference.Switch off the cellular terminal or mobile before boarding an

25、 aircraft. Make sure it is switchedoff. The operation of wireless appliances in an aircraft is forbidden to prevent interference withcommunication systems. Forget to think much of these instructions may lead to the flight safetyor offend against local legal action, or both.Do not operate the cellula

26、r terminal or mobile in the presence of flammable gases or fumes.Switch off the cellular terminal when user are near petrol stations, fuel depots, chemical plants where blasting operations are in progress. Operation of any electrical equipment in potentially explosive atmospheres can constitute a sa

27、fety hazard.emergency calls. In order to make or receive calls, the cellular terminal or mobile must be Some networks do not allow for emergency call if certain network services or phone features have to deactivate those features before you can make an emergency call. Also, some networks require tha

28、t a valid SIM card be properly inserted in the cellular terminal Road safety comes first! Do not use a hand-held cellular terminal or mobile when driving avehicle, unless it is securely mounted in a holder for hands free operation. Before making a call with a hand-held terminal or mobile, park the v

29、ehicle.2 SIM900A OverviewDesigned for Chinese and Indian market, SIM900A is a dual-band GSM/GPRS engine that works on frequencies EGSM 900MHz and DCS 1800MHz. SIM900A features GPRS multi-slot class 10/ class 8 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.Feature Implemen

30、tationPower supply Single supply voltage：3.2V 4.8VPower saving Typical power consumption in SLEEP mode is 1.0mA ( BS-PA-MFRMS=9 ) Frequency Bands z SIM900A Dual-band: EGSM 900, DCS 1800. The SIM900A can search the 4frequency bands automatically. The frequency bands also can be set by ATcommand.z Com

31、pliant to GSM Phase 2/2+GSM class Small MSTransmitting power z Class 4 (2W) at EGSM 900z Class 1 (1W) at DCS 1800GPRS connectivity z GPRS multi-slot class 10 （default）z GPRS multi-slot class 8 (option)z GPRS mobile station class BTemperature range z Normal operation:-30C to +80Cz Restricted operatio

32、n: -40C to -30C and +80 C to +85C (1)z Storage temperature -45C to +90CDATA GPRS:CSD: z GPRS data downlink transfer: max. 85.6 kbps z GPRS data uplink transfer: max. 42.8 kbps z Coding scheme: CS-1, CS-2, CS-3 and CS-4z Supports the protocols PAP (Password Authentication Protocol) usually used for P

33、PP connections.z Integrates the TCP/IP protocol.z Support Packet Switched Broadcast Control Channel (PBCCH) z CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps, non-transparent zUnstructured Supplementary Services Data (USSD) supportSMS z MT, MO, CB, Text and PDU mode z SMS storage: SIM card FAX Grou

34、p 3 Class 1SIM interface Support SIM card: 1.8V, 3V External antenna Antenna padAudio featuresSpeech codec modes:z Half Rate (ETS 06.20) z Full Rate (ETS 06.10)z Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80) z Adaptive multi rate (AMR) z Echo Cancellation z Noise Suppression Serial port and Debug p

35、ortSerial Port:z 8-wire modem interface with status and control lines, unbalanced, asynchronous.z 1200kbps to 115200kbps.z Serial Port can be used for AT commands or data stream.z Supports RTS/CTS hardware handshake and software ON/OFF flow control. z Multiplex ability according to GSM 07.10 Multipl

36、exer Protocol. z Autobauding supports baud rate from 1200 bps to 57600bps. Debug port:z 2-wire null modem interface DBG_TXD and DBG_RXD. zCan be used for debugging and upgrading firmware.Phonebook management Support phonebook types: SM, FD, LD, RC, ON, MC. SIM Application Toolkit Support SAT class 3

37、, GSM 11.14 Release 99 Real time clock ImplementedTimer function Programmable via AT command Physical characteristics Size: 24mm x 24mm x 3mm Weight: 3.4gFirmware upgrade Firmware upgradeable by debug port. (1) The SIM900A does work, but deviations from the GSM specification may occur.Table 4: Codin

38、g schemes and maximum net data rates over air interface1 Timeslot2 Timeslot 4 TimeslotCS-1: 9.05kbps 18.1kbps 36.2kbpsCS-2: 13.4kbps 26.8kbps 53.6kbpsCS-3: 15.6kbps 31.2kbps 62.4kbpsCS-4: 21.4kbps 42.8kbps 85.6kbps2.2 SIM900A Functional DiagramThe following figure shows a functional diagram of the S

39、IM900A and illustrates the mainly functional part: z The GSM baseband enginez Flash and SRAMz The GSM radio frequency partz The antenna interfacez The Other interfacesFigure 1: SIM900A functional diagram2.3 SIM900A Evaluation BoardIn order to help user on the application of SIM900A, SIMCom can suppl

40、y an Evaluation Board (EVB) that interfaces the SIM900A directly with appropriate power supply, SIM card holder, RS232 serial port, handset port, earphone port, line in port, antenna and all GPIO of the SIM900A.Figure 2: Top view of SIM900A EVBFor details please refer to the SIM900-EVB_UGD document.

41、3 Application InterfaceSIM900A is equipped with a 68-pin SMT pad that connects to the cellular application platform. Sub-interfaces included in these SMT pads are described in detail in following chapters: z Power supply(please refer to Chapter 3.3)z Analog audio interfaces (please refer to Chapter

42、3.8) z SIM interface (please refer to Chapter 3.9)Electrical and mechanical characteristics of the SMT pad are specified in Chapter 5.3.1 SIM900A Pin DescriptionTable 5: Pin description Power Supply PIN NAME I/O DESCRIPTION DC CHARACTERISTICSCOMMENT VBATI3 VBAT pins are dedicated to connect the supp

43、ly voltage. The power supply of SIM900A has to be a single voltage source of VBAT= 3.2V .4.8V . It must be able to provide sufficient current in a transmit burst which typically rises to 2AVmax= 4.8V Vmin=3.2V Vnorm=4.0VVRTCI/O Current input for RTC whenthe battery is not supplied for the system.Cur

44、rent output for backup battery when the main battery is present and the backup battery is in low voltage state. Vmax=3.15V Vmin=2.0V Vnorm=3.0VIout(max)= 300uA Iin=2 uADo not keep pin open, it should be connected to a battery or a capacitor.VDD_EXTO2.8V output power supplyVmax=2.95V Vmin=2.70V Vnorm

45、=2.80V Iout(max)= 10mA If unused, keep open.GND Ground PIN NAME I/O DESCRIPTION DC CHARACTERISTICSPWRKEY I V oltage input for PWRKEY.PWRKEY should be pulledlow to power on or power offthe system. The user shoulddrive the PWRKEY to lowlevel voltage for a short timewhen power on or power offthe system

46、 because thesystem need margin time inorder to assert the software.VILmax=0.15*VDD_EXTVIHmin=0.85* VDD_EXTVImax=VDD_EXTVILmin= 0VIt is alreadypulled up.PWRKEY_OUTO Connecting PWRKEY andPWRKEY_OUT for a shorttime then release also canpower on or power off themodule.VOHmin= VDD_EXT-0.1VVOLmax=0.1VVOHm

47、ax= VDD_EXTVOLmin= 0VAudio interfacesPIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENTMIC_PMIC_NI Positive and negative voiceband inputAudio DC Characteristics refer tochapter 3.9If unused keepopenSPK_PSPK_NO Positive and negative voiceband outputIf unused keepopenLINEIN_RLINEIN_LI Line input If u

48、nused keepopen GERNERAL PURPOSE input/outputPIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENT STATUS O Indicate status of module sworkingIf unused keepopen NETLIGHT O Indicate status of modulesnetworkIf unused keepopenDISP_DATA I/ODISP _CLK ODISP _CS ODISP _D/C ODisplay interfaceIf unused keepopen

49、SCL O I2C bus clockSDA I/O I2C bus dataIf unused keepopenKBR0KBR4O If unused keepthese pins open KBC1KBC4IKeypad interfaceVILmax=0.15 *VDD_EXTVIHmin=0.85*VDD_EXTVILmin= 0VVIHmax= VDD_EXTVOHmin= VDD_EXT-0.1VVOLmax=0.1VVOHmax= VDD_EXTVOLmin= 0VPull up tounused keeppins openSerial port PIN NAME I/O DES

50、CRIPTION DC CHARACTERISTICS COMMENTRXD I Receive data TXD O Transmit data RTS I Request to send CTS O Clear to send RI O Ring indicator DSR O Data Set Ready DCD O Data carrier detect DTRIData terminal ReadyVILmax=0.15 *VDD_EXT VIHmin=0.85*VDD_EXT VILmin= 0VVIHmax= VDD_EXTVOHmin= VDD_EXT-0.1V VOLmax=

51、0.1VVOHmax= VDD_EXT VOLmin= 0VIf RXD pin not used ，it should be pulled up to VDD_EXT. DTR Pin has been pulledup to VDD_EXT internally. Other unused pins can keep open Debug interface PIN NAME I/O DESCRIPTION DC CHARACTERISTICSCOMMENT DBG_TXDODBG_RXD ISerial interface for debugging and firmware upgra

52、de VILmax=0.15 *VDD_EXT VIHmin=0.85*VDD_EXT VILmin= 0VVIHmax= VDD_EXTVOHmin= VDD_EXT-0.1V VOLmax=0.1VVOHmax= VDD_EXT VOLmin= 0VIf unused keep pins openSIM interface PIN NAME I/O DESCRIPTION DC CHARACTERISTICSCOMMENTSIM_VDD OV oltage supply for SIM cardThe voltage can be select by software automatica

53、lly either 1.8V or 3V SIM_DATA I/O SIM data input/output SIM_CLK O SIM clock SIM_RSTOSIM resetVILmax=0.15 *SIM_VDD VIHmin=0.85*SIM_VDD VILmin= 0VVIHmax= SIM_VDDVOHmin= SIM_VDD-0.1V VOLmax=0.1VVOHmax= SIM_VDD VOLmin= 0VAll signals of SIM interface should protect against ESD with a TVS diode array.NCE

54、ISIM Card DetectionVILmax=0.15 *VDD_EXTVIHmin=0.85*VDD_EXT VILmin= 0VVIHmax= VDD_EXTIf unused keep openADC PIN NAME I/O DESCRIPTION DC CHARACTERISTICSCOMMENT ADCIGeneral purpose analog to digital converter.Input voltage range: 0V 2.8V If unused keep openExternal Reset PIN NAME I/O DESCRIPTION DC CHA

55、RACTERISTICSCOMMENT NRESETIExternal reset input(Active low) VILmax=0.15 *VDD_EXT VIHmin=0.85*VDD_EXTVILmin= 0VVIHmax= VDD_EXT If unused keep openPulse Width Modulation PIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENT PWM1OPWM OutputPWM2 O PWM OutputVOHmin= VDD_EXT-0.1V VOLmax=0.1VVOHmax= VDD_EXT

56、VOLmin=0If unused keep open 3.2 Operating ModesThe table below briefly summarizes the various operating modes referred to the following chapters. Table 6: Overview of operating modesFunctionGSM/GPRS SLEEP Module will automatically go into SLEEP mode if DTR is set to high level and there is no on air and no hardware interrupt (such as GPIO interrupt or data on serial port).In this case, the current consumption of module will reduce to the minimal level.In SL