SimCom SIM802 HD User manual

Hardware Design
SIM802_HD_V2.01

SIM802 Hardware Design
Document Title: SIM802 Hardware Design
Version: 2.01
Date: 2010-01-12
Status:
Document Control ID: SIM802_HD_V2.01
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. SIMCom has not
undertaken any independent search for additional relevant information, including any information
that may be in the 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. All specifications supplied herein are subject to change.
Copyright
This document contains proprietary technical information which is 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 registration 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. 2010
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Contents
Contents ........................................................................................................................................... 3
Version history................................................................................................................................. 8
1 Introduction................................................................................................................................... 9
1.1 Related documents .............................................................................................................. 9
1.2 Terms and abbreviations.................................................................................................... 10
1.3 Safety caution.................................................................................................................... 12
2 Product concept........................................................................................................................... 14
2.1 SIM802 key features at a glance ....................................................................................... 15
2.2 SIM802 functional diagram .............................................................................................. 17
2.3 SIM802 evaluation board.................................................................................................. 18
3 Application interface................................................................................................................... 19
3.1 SIM802 Pin description..................................................................................................... 19
3.2 Operating modes ............................................................................................................... 23
3.3 Power supply ..................................................................................................................... 24
3.3.1 Power supply pins ................................................................................................... 25
3.3.2 Minimizing power losses......................................................................................... 26
3.3.3 Monitoring power supply ........................................................................................ 26
3.4 Power up/down scenarios.................................................................................................. 26
3.4.1 Turn on SIM802 ...................................................................................................... 26
3.4.2 Turn off SIM802 ..................................................................................................... 29
3.5 Charging interface............................................................................................................. 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 saving ..................................................................................................................... 36
3.6.1 Minimum functionality mode.................................................................................. 37
3.6.2 GSM Sleep mode (slow clocking mode)................................................................. 37
3.6.3 SRD sleep mode (slow clocking mode) .................................................................. 38
3.6.4 Wake up SIM802 from GSM sleep mode ............................................................... 38
3.7 Summary of state transitions (except sleep mode)............................................................ 38
3.8 RTC backup....................................................................................................................... 39
3.9 Serial interfaces................................................................................................................. 43
3.9.1 Main serial port and Debug serial port supporting .................................................. 44
3.9.2 GSM part software upgrade and software debug .................................................... 45
3.10 Audio interfaces .............................................................................................................. 47
3.10.1 Speaker interface configuration............................................................................. 48
3.10.2 Microphone interfaces configuration..................................................................... 49
3.10.3 Referenced electronic characteristic...................................................................... 49
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3.11 SIM interface................................................................................................................... 50
3.11.1 SIM card application ............................................................................................. 50
3.11.2 Design considerations for SIM card holder ........................................................... 51
3.11.3 Design considerations for SIM card holder ........................................................... 52
3.12 LCD display interface ..................................................................................................... 54
3.13 General purpose input & output (GPIO) ......................................................................... 55
3.14 ADC ................................................................................................................................ 55
3.15 Behaviors of the Ring line (The main serial interface only) ........................................... 56
3.16 Network status indication LED lamp .............................................................................. 57
3.17 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 frequencies........................................................................................... 61
5 Electrical, reliability and radio characteristics ............................................................................ 62
5.1 Absolute maximum ratings................................................................................................ 62
5.2 Operating temperatures ..................................................................................................... 62
5.3 Power supply rating........................................................................................................... 62
5.4 Current consumption......................................................................................................... 63
5.5 Electro-Static discharge..................................................................................................... 64
6 Mechanics ................................................................................................................................... 65
6.1 Mechanical dimensions of SIM802................................................................................... 65
6.2 PIN assignment of SIM802............................................................................................... 69
6.3 The ramp-soak-spike reflow profile of SIM802................................................................ 72
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Table Index
TABLE 1: RELATED DOCUMENTS.................................................................................................... 9
TABLE 2: TERMS AND ABBREVIATIONS ...................................................................................... 10
TABLE 3: SIM802 KEY FEATURES................................................................................................... 15
TABLE 4: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE.16
TABLE 5: PIN DESCRIPTION ............................................................................................................ 19
TABLE 6: OVERVIEW OF OPERATING MODES............................................................................. 23
TABLE 7: AT COMMANDS USED IN ALARM MODE .................................................................... 29
TABLE 8: SPEC OF RECOMMENDED BATTERY PACK................................................................ 34
TABLE 9: OPERATING MODES ........................................................................................................ 35
TABLE 10: AT COMMAND USUALLY USED IN GHOST MODE .................................................. 36
TABLE 11: SUMMARY OF STATE TRANSITIONS.......................................................................... 38
TABLE 12: SPECIFICATION OF XH414H-IV01E............................................................................. 42
TABLE 13: LOGIC LEVELS OF SERIAL PORTS PINS.................................................................... 43
TABLE 14: AUDIO INTERFACE SIGNAL......................................................................................... 47
TABLE 14: MIC INPUT CHARACTERISTICS .................................................................................. 50
TABLE 15: AUDIO OUTPUT CHARACTERISTICS ......................................................................... 50
TABLE 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 SIM802.............................................................................................................. 55
TABLE 22: ADC SPECIFICATION ..................................................................................................... 55
TABLE 23: BEHAVIOURS OF THE RING LINE............................................................................... 56
TABLE 24: WORKING STATE OF NETWORK STATUS INDICATION LED PIN ......................... 57
TABLE 25: PIN DEFINITION OF THE SRD INTERFACE ............................................................... 57
TABLE 26: BUZZER OUTPUT CHARACTERISTICS ...................................................................... 59
TABLE 27: SIM802 CONDUCTED RF OUTPUT POWER................................................................ 61
TABLE 28: SIM802 CONDUCTED RF RECEIVE SENSITIVITY.................................................... 61
TABLE 29: SIM802 GSM OPERATING FREQUENCIES.................................................................. 61
TABLE 30: SIM802 SRD OPERATING FREQUENCIES................................................................... 61
TABLE 31: ABSOLUTE MAXIMUM RATING.................................................................................. 62
TABLE 32: SIM802 OPERATING TEMPERATURE.......................................................................... 62
TABLE 33: SIM802 POWER SUPPLY RATING................................................................................. 62
TABLE 34: SIM802 CURRENT CONSUMPTION ............................................................................. 63
TABLE 35: THE ESD ENDURE STATUE MEASURED TABLE ...................................................... 64
TABLE 36: PIN ASSIGNMENT........................................................................................................... 69
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Figure Index
FIGURE 1: SIM802 FUNCTIONAL DIAGRAM ................................................................................ 17
FIGURE 2: TOP VIEW OF SIM802 EVB ............................................................................................ 18
FIGURE 3: VBAT INPUT ................................................................................................................. 24
FIGURE 4: REFERENCE CIRCUIT OF THE SOURCE POWER SUPPLY INPUT.......................... 25
FIGURE 5: VBAT VOLTAGE DROP DURING TRANSMIT BURST ............................................... 25
FIGURE 6: TURN ON SIM802 USING DRIVING CIRCUIT ............................................................ 27
FIGURE 7: TURN ON SIM802 USING BUTTON.............................................................................. 27
FIGURE 8 TIMING OF TURN ON SYSTEM ..................................................................................... 28
FIGURE 9: TIMING OF TURN OFF SYSTEM ............................................................................... 30
FIGURE 10: TIMING OF RESTART SYSTEM .................................................................................. 32
FIGURE 11: BATTERY CHARGER AND PACK................................................................................ 33
FIGURE 12: TYPICAL CONNECTION OF DTR ............................................................................... 37
FIGURE 13: RTC SUPPLY FROM NON-CHARGEABLE BATTERY .............................................. 40
FIGURE 14: RTC SUPPLY FROM RECHARGEABLE BATTERY ................................................... 40
FIGURE 15: RTC SUPPLY FROM CAPACITOR ............................................................................... 40
FIGURE 16: PANASONIC EECEMOE204A CHARGE CHARACTERISTIC .................................. 41
FIGURE 17: MAXELL TC614 CHARGE CHARACTERISTIC......................................................... 41
FIGURE 18: SEIKO TS621 CHARGE CHARACTERISTIC.............................................................. 42
FIGURE 19: CONNECTION 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 24: SPEAKER INTERFACE WITH AMPLIFIER CONFIGURATIO.................................. 48
FIGURE 26: EARPHONE INTERFACE CONFIGURATION............................................................. 49
FIGURE 27: SIM INTERFACE REFERENCE CIRCUIT WITH 6 PINS SIM CARD ....................... 52
FIGURE 28: AMPHENOL C707-10M006 512 2 SIM CARD HOLDER ............................................ 53
FIGURE 29: MOLEX 91228 SIM CARD HOLDER ........................................................................... 54
FIGURE 30: SIM802 SERVICES AS RECEIVER............................................................................... 56
FIGURE 31: SIM802 SERVICES AS CALLER................................................................................... 56
FIGURE 32: REFERENCE CIRCUIT FOR NETWORK STATUS LED ............................................ 57
FIGURE 33: I2C APPLICATION OF THE SRD INTERFACE............................................................ 58
FIGURE 34: SPI APPLICATION OF THE SRD INTERFACE ........................................................... 58
FIGURE 35: REFERENCE CIRCUIT OF BUZZER ........................................................................... 59
FIGURE 36: RF PAD (BOTTOM VIEW) ............................................................................................ 60
FIGURE 37: SIM802 TOP VIEW ......................................................................................................... 65
FIGURE 38: SIM802 SIDE VIEW ....................................................................................................... 66
FIGURE 39: SIM802 BOTTOM VIEW ............................................................................................... 66
FIGURE 40: PAD BOTTOM VIEW ..................................................................................................... 67
FIGURE 41: FOOTPRINT RECOMMENDATION ............................................................................. 68
FIGURE 42: SIM802 PINS DEFINITION (TOP VIEW) .................................................................. 70
FIGURE 43: BOTTOM VIEW OF SIM802 ......................................................................................... 71
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FIGURE 44: TOP VIEW OF SIM802 ................................................................................................... 71
FIGURE 45: THE RAMP-SOAK-SPIKE REFLOW PROFILE OF SIM802....................................... 72
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Version history
Data Version Description of change Author
2010-01-12 2.01 Origin Jirang Feng
Scope of 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 850/1900MHz, SRD RF 868MHz Version
SIM802-C: GSM/GPRS 900/1800 MHz and 850/1900MHz, SRD RF 915MHz Version
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1 Introduction
This document describes the hardware interface of the SIMCom SIM802 module that connects to
the specific application and the air interface. As SIM802 can be integrated with a wide range of
applications, all functional components of SIM802 are described in great detail.
This document can help you quickly understand SIM802 interface specifications, electrical and
mechanical details. With the help of this document and other SIM802 application notes and user
guide, you can use SIM802 module to design and set-up mobile applications quickly.
1.1 Related documents
Table 1: Related documents
SN Document name Remark
[1] SIM802_ATC SIM802_ATC
[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 07.05: Digital cellular telecommunications (Phase 2+); Use of
Data Terminal Equipment – Data Circuit terminating
Equipment (DTE – DCE) interface for Short Message
Service (SMS) and Cell Broadcast Service (CBS)
[5] GSM 11.14: Digital cellular telecommunications system (Phase 2+);
Specification of the SIM Application Toolkit for the
Subscriber Identity Module – Mobile Equipment (SIM –
ME) interface
[6] GSM 11.11: Digital cellular telecommunications system (Phase 2+);
Specification of the Subscriber Identity Module – Mobile
Equipment (SIM – ME) interface
[7] GSM 03.38: Digital cellular telecommunications system (Phase 2+);
Alphabets and language-specific information
[8] GSM 11.10 Digital cellular telecommunications system (Phase 2)；
Mobile Station (MS) conformance specification；Part 1:
Conformance specification
[9] GSM 11.10 Digital cellular telecommunications system (Phase 2)；
Mobile Station (MS) conformance specification；Part 1:
Conformance specification
[10] AN_SerialPort AN_SerialPort
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1.2 Terms and abbreviations
Table 2: Terms and abbreviations
Abbreviation Description
ADC Analog-to-Digital Converter
AMR Adaptive Multi-Rate
ARP Antenna Reference Point
ASIC Application Specific Integrated Circuit
BER Bit Error Rate
BTS Base Transceiver Station
CHAP Challenge Handshake Authentication Protocol
CS Coding Scheme
CSD Circuit Switched Data
CTS Clear to Send
DAC Digital-to-Analog Converter
DRX Discontinuous Reception
DSP Digital 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 Compatibility
ESD Electrostatic Discharge
ETS European Telecommunication Standard
FCC Federal Communications Commission (U.S.)
FDMA Frequency Division Multiple Access
FR Full Rate
GMSK Gaussian Minimum Shift Keying
GPRS General Packet Radio Service
GSM Global Standard for Mobile Communications
HR Half Rate
I/O Input/Output
IC Integrated Circuit
IMEI International Mobile Equipment Identity
Inorm Normal Current
Imax Maximum Load Current
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kbps Kilo bits per second
LED Light Emitting Diode
Li-Ion Lithium-Ion
MO Mobile Originated
MS Mobile Station (GSM engine), also referred to as TE
MT Mobile Terminated
PAP Password Authentication Protocol
PBCCH Packet Switched Broadcast Control Channel
PCB Printed Circuit Board
PCS Personal Communication System, also referred to as GSM 1900
PDU Protocol Data Unit
PPP Point-to-point protocol
RF Radio Frequency
RMS Root Mean Square (value)
RTC Real Time Clock
Rx Receive Direction
SIM Subscriber Identification Module
SMS Short Message Service
SRD Short range device
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 Standing Wave Ratio
Vmax Maximum Voltage Value
Vnorm Normal Voltage Value
Vmin Minimum Voltage Value
VIHmax Maximum Input High Level Voltage Value
VIHmin Minimum Input High Level Voltage Value
VILmax Maximum Input Low Level Voltage Value
VILmin Minimum Input Low Level Voltage Value
VImax Absolute Maximum Input Voltage Value
VImin Absolute Minimum Input Voltage Value
VOHmax Maximum Output High Level Voltage Value
VOHmin Minimum Output High Level Voltage Value
VOLmax Maximum Output Low Level Voltage Value
VOLmin Minimum Output Low Level Voltage Value
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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)
ME Mobile Equipment phonebook
RC Mobile Equipment list of received calls
SM SIM phonebook
DC ME dialed calls list(+CPBW may not be applicable for this storage)(same as
LD)
LA Last Number All list (LND/LNM/LNR)
ON SIM (or ME) own numbers (MSISDNs) list
SD SIM service dial number
VM SIM voice mailbox
BN SIM barred dialed number
1.3 Safety caution
The following safety precautions must be observed during all phases of the operation. Usage,
service or repair of any cellular terminal or mobile incorporating SIM802 module. Manufactures
of the cellular terminal should send words 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 precautions.
Switch off the cellular terminal or mobile before boarding an aircraft. Make sure
it be switched off. The operation of wireless appliances in an aircraft is forbidden
to prevent interference with communication systems. Forget to think much of
these instructions may lead to the flight safety or offender against local legal
action, or both.
Do not operate the cellular terminal or mobile in the presence of flammable gases
or fumes. Switch off the cellular terminal when you are near petrol stations, fuel
depots, chemical plants or where blasting operations are in progress. Operation of
any electrical equipment in potentially explosive atmospheres can constitute a
safet
y
hazard.
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 be sensitive to not operate normally for RF energy interference.
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SIM802 Hardware Design
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 electric equipment.
Road safety comes first! Do not use a hand-held cellular terminal or mobile
when driving a vehicle, 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
vehicle. Road safety comes first! Do not use a hand-held cellular terminal or
GSM cellular terminals or mobiles 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 need emergent help, Please Remember using emergency calls. 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 certain network services or
phone features are in use (e.g. lock functions, fixed dialing etc.). You may have
to deactivate those features before you can make an emergency call.
Also, some networks require that a valid SIM card be properly inserted in the
cellular terminal or mobile.
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2 Product concept
Designed for global market, SIM802 module is a complete Quad-Band GSM/GPRS solution that
is also equipped with SRD RF technology and embedded SIM card IC (optional).The GSM/GPRS
engine works on frequencies GSM/GPRS 900/1800 MHz and 850/1900MHz, SIM802 series
features GPRS multi-slot class 10/Class 8 (the default is class 10) capability and supports the
GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. The SRD RF engine works on
433/868/915MHz, SRD RF supports the multi-channel choice, transparent date transfer without
complex user setting.
The compact design of the SIM802 makes it easy to integrate GSM/GPRS & SRD RF as an
all-in-one solution. You will save significantly both time and cost for the integration of additional
hardware components.
With a tiny configuration of 33mm x 33mm x 5.2 mm, SIM802 can meet almost all the space
requirement in your application, such as M2M and mobile data communication system etc.
The hardware package of 60 pins
z12 GND Pins and 2 VBAT pins
z1 Pin is programmable as General Purpose I/O .This gives you the flexibility to develop
customized applications.
zSerial port and Debug port can help you easily develop your applications. But they can not
work at the same time.
zTwo audio channels include two microphone inputs and two speakers’ outputs. This can be
easily configured by AT command.
zLCD display interface.
zEither SIM card interface or embedded SIM card IC is optional.
zCharge interface. Charge circuit integrated inside the SIM802, it is very suitable for the
battery power application.
zGSM RF and SRD RF antenna interface. Customer’s antenna should be located in the
customer’s mainboard and connect to module’s antenna pad through micro strip line or other
type RF traces which impendence must be 50Ω.
zI2C and SPI interfaces for SRD.
The SIM802 is designed with power saving technique, so that the current consumption is as low
as 6mA in SLEEP mode (BS-PA-MFRMS=5, only GSM sleep mode current consumption).
The SIM802 is integrated with the TCP/IP protocol，Extended TCP/IP AT commands are
developed for customers to use the TCP/IP protocol easily, which is useful for those data transfer
applications.
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2.1 SIM802 key features at a glance
Table 3: SIM802 key features
Feature Implementation
Power supply Single supply voltage 3.4V – 4.5V
Power saving Typical power consumption in SLEEP mode to 6mA
( BS-PA-MFRMS=5 )
Charging Supports charging control for Li-Ion battery
GSM frequency Bands zSIM802 quad-band: GSM/GPRS 900/1800 MHz and
850/1900MHz. The SIM802 can search the 4 frequency bands
automatically. The frequency bands also can be set by AT
command.
zCompliant to GSM Phase 2/2+
GSM class Small MS（CLASS:A,B,C,D）
Transmit power zClass 4 (2W) at EGSM900/GSM850
zClass 1 (1W) at DCS1800/PCS1900
GPRS connectivity
zGPRS multi-slot class 8 （optional）
zGPRS multi-slot class 10 ( default)
zGPRS mobile station class B
Temperature range zNormal operation: -30°C to +80°C
zRestricted operation: -40°C to -30°C and +80°C to +85°C(1)
zStorage temperature: -45°C to +90°C
DATA GPRS:
CSD:
zGPRS data downlink transfer: max. 85.6 kbps
zGPRS data uplink transfer: max. 42.8 kbps
zCoding scheme: CS-1, CS-2, CS-3 and CS-4
zSIM802 supports the protocols PAP (Password Authentication
Protocol) usually used for PPP connections.
zThe SIM802 integrates the TCP/IP protocol.
zSupport Packet Switched Broadcast Control Channel (PBCCH)
zCSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps,
non-transparent
zUnstructured Supplementary Services Data (USSD) support
SMS zMT, MO, CB, Text and PDU mode
zSMS storage: SIM card
FAX Group 3 Class 1
SIM interface Support SIM card: 1.8V ,3V
External antenna Connected via 50 Ohm antenna connector or antenna pad
Audio features Speech codec modes:
zHalf Rate (ETS 06.20)
zFull Rate (ETS 06.10)
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zEnhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
zAdaptive multi rate (AMR)
zEcho Cancellation
Serial interface and
Debug interface
zSerial Port: Seven lines on Serial Port Interface
zSerial Port can be used for CSD FAX, GPRS service and
sending AT command of controlling module.
zDebug port: provide two lines on Serial Port Interface /TXD
and /RXD
zDebug port is only used for debugging
Phonebook management Support phonebook types: SM, FD, LD, MC, RC, ON,
ME,BN,VM,LA,DC,SD
SIM Application Toolkit Support SAT class 3, GSM 11.14 Release 99
Real time clock Implemented
Timer function 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– 434.79MHz
SIM802-B: 863MHz – 870MHz
SIM802-C: 902MHz – 928MHz
SRD modulation schemes GFSK
SRD frequency interval 100KHz
SRD maximum transmit
power
18dBm
SRD receive sensitivity -118dBm@2400bps
SRD air interface date
rate
2400 – 128000bps
SRD TX current
consumption
100mA@18dBm (peak value)
SRD RX current
consumption
29mA
Table 4: 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
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2.2 SIM802 functional diagram
The following figure shows a functional diagram of the SIM802 and illustrates the mainly
functional part:
zThe GSM baseband engine
zFlash and SRAM
zThe GSM radio frequency part
zThe GSM antenna interface
zThe SRD radio frequency part
zThe SRD RF antenna interface
zThe embedded SIM card IC (optional)
zThe 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
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2.3 SIM802 evaluation board
In order to help you on the application of SIM802, SIMCom can supply an Evaluation 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
SIM802.
Figure 2: Top view of SIM802 EVB
For details please refer to the SIM802-EVB_UGD document.
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3 Application interface
All hardware interfaces are described in detail in following chapters:
zPower supply and charging control (see Chapters 3.3 and 3.5)
zProvide main serial interface and debug serial interface (see chapter3.9)
zTwo analog audio interfaces (see chapter 3.10)
zSIM interface (see chapter 3.11)
zLCD interface (see chapter 3.12)
zGPIO interface (see chapter 3.13)
zADC interface (see chapter 3.14)
zBuzzer interface (see chapter 3.18)
3.1 SIM802 Pin description
Table 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 voltage
source of VBAT=
3.4V...4.5V. It must be able to
provide sufficient current in a
transmit burst which
typically rises to 2A.Mostly,
these 2 pins are voltage
input, however ,when use the
charge circuit to charge the
battery ,these pins become
the current output, select one
of these pins as the charge
current output Pin
Vmax= 4.5V
Vmin=3.4V
Vnorm=4.0V
VRTC Power Current input for RTC when
the battery is not supplied for
Vmax=2.0V
Vmin=1.2V
Do not keep pin
open, it should be
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the system.
Current output for backup
battery when the main
battery is present and the
backup battery is in low
voltage state.
Vnorm=1.8V
Iout(max)= 20uA
Iin=5 uA
connected to a
battery or a
capacitor.
VCHG I Voltage input for the charge
circuit, as the signal for
detecting the charger
connecting
Vmax=5.25V
Vmin=1.1* VBAT
Vnorm=5.1V
Imax=650mA
If unused keep pin
open
GND ground Digital ground
Power on or power off
Pin name I/O Description
D
C characteristics
C
omment
PWRKEY I Press the key , the PWRKEY
get a low level voltage for
user to power on or power
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
VImax=VBAT
Pull up to VBAT
inside.
Audio interfaces
Pin name I/O Description DC characteristics Comment
MIC1P
MIC1N
I Positive and negative voice
band input
MIC2P
MIC2N
I Auxiliary positive and
negative voice band input
SPK1P
SPK1N
O Positive and negative voice
band output
SPK2P
SPK2N
O Auxiliary positive and
negative voice band output
Characteristics refer
to chapter 3.10
If unused keep
pins open
AGND Analog ground Separate ground
connection for
external audio
circuits.
If unused, it
should be
connected to GND
General purpose input/output
SIM802_HD_V2.01 12.01.2010
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