SimTech SIMCom SIM868 Series Supplement

SIM868_Series_Hardware_Design_V1.06
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Smart Machine Smart Decision
SIM868_Series_Hardware_Design_V1.0612017-07-13
Document Title SIM868 Series Hardware Design
Version V1.06
Date 2017-07-13
Status Release
Document Control ID SIM868_Series_Hardware_Design_V1.06
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. 2017
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Contents
1. Introduction........................................................................................................ 10
2. SIM868 Overview .............................................................................................. 10
2.1. SIM868 Key Features ......................................................................................................... 11
2.2. Operating Modes.................................................................................................................14
2.3. Functional Diagram.............................................................................................................15
3. Package Information ......................................................................................... 16
3.1. Pin Out Diagram .................................................................................................................16
3.2. Pin Description....................................................................................................................17
3.3. Package Dimensions ...........................................................................................................19
4. Application Modes of SIM868.......................................................................... 22
4.1. All-in-one Mode..................................................................................................................22
4.2. Stand-alone Mode ...............................................................................................................23
5. Application Interface of GSM .......................................................................... 24
5.1. Power Supply of GSM ........................................................................................................24
5.2. Reference Circuit of GSM Power Supply...........................................................................25
5.3. Power on/off GSM Part.......................................................................................................26
5.3.1. Power on GSM.................................................................................................................................... 26
5.3.2. Power off GSM ................................................................................................................................... 27
5.4. Power Saving Mode of GSM ..............................................................................................28
5.4.1. Minimum Functionality Mode of GSM Part....................................................................................... 28
5.5. Serial Port of GSM..............................................................................................................29
5.5.1. Function of Serial Port ........................................................................................................................ 30
5.5.2. Serial Interfaces................................................................................................................................... 30
5.5.3. Debug Interface................................................................................................................................... 32
5.5.4. Software Upgrade of GSM.................................................................................................................. 33
5.6. UART1_RI Behaviors.........................................................................................................33
5.7. Audio Interfaces..................................................................................................................34
5.7.1. Speaker Interfaces Configuration........................................................................................................ 35
5.7.2. Microphone Interfaces Configuration ................................................................................................. 36
5.7.3. Audio Electronic Characteristic .......................................................................................................... 36
5.7.4. TDD Noise of GSM ............................................................................................................................ 36
5.8. SIM Card Interface..............................................................................................................37
5.8.1. SIM Card Application ......................................................................................................................... 37
5.8.2. SIM Card Design Guide...................................................................................................................... 38
5.8.3. Design Considerations for SIM Card Holder ...................................................................................... 39
5.9. SD Interface ........................................................................................................................41
5.10. I2C Bus ...............................................................................................................................41
5.11. ADC ....................................................................................................................................41
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5.12. Network Status Indication...................................................................................................42
5.13. Operating Status Indication.................................................................................................42
5.14. RF Synchronization Signal .................................................................................................43
5.15. Antenna Interface of GSM..................................................................................................43
5.16. Bluetooth Antenna Interface ...............................................................................................45
5.17. Bluetooth Low Energy (BLE).............................................................................................45
6. Application Interface of GNSS......................................................................... 47
6.1. GNSS Overview..................................................................................................................47
6.2. Power Supply of GNSS.......................................................................................................47
6.3. Backup Power of GNSS......................................................................................................47
6.4. Power on/off GNSS ............................................................................................................48
6.5. Serial Port of GNSS ............................................................................................................49
6.6. Software Upgrade of GNSS................................................................................................50
6.7. 1PPS Output........................................................................................................................50
6.8. Antenna Interface................................................................................................................51
6.8.1. Passive Antenna .................................................................................................................................. 51
6.8.2. Active Antenna.................................................................................................................................... 52
6.9. Operation Modes of GNSS .................................................................................................52
6.10. A-GPS .................................................................................................................................54
6.10.1. Easy Mode ....................................................................................................................................... 54
6.10.2. EPO.................................................................................................................................................. 54
6.11. Fast-Fix ...............................................................................................................................54
6.12. Multi-tone AIC....................................................................................................................55
6.13. SBAS...................................................................................................................................55
7. PCB Layout ........................................................................................................ 56
7.1. Pin Assignment ...................................................................................................................56
7.2. Principle of PCB Layout .....................................................................................................57
7.2.1. Antenna Interface ................................................................................................................................ 57
7.2.2. Power Supply ...................................................................................................................................... 57
7.2.3. SIM Card Interface.............................................................................................................................. 57
7.2.4. Audio Interface.................................................................................................................................... 57
8. Electrical, Reliability and Radio Characteristics ........................................... 58
8.1. Absolute Maximum Ratings ...............................................................................................58
8.2. Recommended Operating Conditions .................................................................................58
8.3. Digital Interface Characteristics..........................................................................................58
8.4. SIM Card Interface Characteristics.....................................................................................59
8.5. SIM_VDD Characteristics ..................................................................................................59
8.6. VDD_EXT Characteristics..................................................................................................59
8.7. Current Consumption（GSM_VBAT=4.0V）...................................................................59
8.8. Electro-Static Discharge......................................................................................................60
8.9. Radio Characteristics ..........................................................................................................61
8.9.1. Module RF Output Power ................................................................................................................... 61
8.9.2. Module RF Receive Sensitivity........................................................................................................... 62
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8.9.3. Module Operating Frequencies ........................................................................................................... 62
9. Manufacturing ................................................................................................... 63
9.1. Top and Bottom View of SIM868.......................................................................................63
9.2. Typical Solder Reflow Profile.............................................................................................63
9.3. The Moisture Sensitivity Level...........................................................................................64
9.4. Baking Requirements..........................................................................................................64
10. Packaging ......................................................................................................... 65
11. Appendix .......................................................................................................... 67
11.1. Related Documents .............................................................................................................67
11.2. Terms and Abbreviations ....................................................................................................68
11.3. Safety Caution.....................................................................................................................70
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Table Index
TABLE 1: KEY FEATURES OF GSM PART.................................................................................................................. 11
TABLE 2: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ............................ 12
TABLE 3: KEY FEATURES OF GNSS PART ................................................................................................................ 12
TABLE 4: OVERVIEW OF GSM OPERATING MODES .............................................................................................. 14
TABLE 5: OVERVIEW OF GNSS OPERATING MODES............................................................................................. 15
TABLE 6: PIN DESCRIPTION ....................................................................................................................................... 17
TABLE 7: RECOMMENDED ZENER DIODE .............................................................................................................. 24
TABLE 8: THE CURRENT CONSUMPTION OF FUNCTION MODE ........................................................................ 28
TABLE 9: SERIAL PORT PIN DEFINITION ................................................................................................................. 29
TABLE 10: SERIAL PORT CHARACTERISTICS......................................................................................................... 30
TABLE 11: USB_VBUS OPERATION VOLTAGE ........................................................................................................ 33
TABLE 12: UART_RI BEHAVIOURS ............................................................................................................................ 33
TABLE 13: AUDIO INTERFACE DEFINITION............................................................................................................ 34
TABLE 14: PERFORMANCE OF AUDIO AMPLIFIER................................................................................................ 35
TABLE 15: MICROPHONE INPUT CHARACTERISTICS........................................................................................... 36
TABLE 16: AUDIO OUTPUT CHARACTERISTICS .................................................................................................... 36
TABLE 17: SIM PIN DEFINITION................................................................................................................................. 37
TABLE 18: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) .............................................................................. 39
TABLE 19: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER)....................................................................... 40
TABLE 20: PIN DEFINITION OF THE I2C ................................................................................................................... 41
TABLE 21: PIN DEFINITION OF THE ADC................................................................................................................. 41
TABLE 22: ADC SPECIFICATION ................................................................................................................................ 42
TABLE 23: PIN DEFINITION OF THE NETLIGHT ..................................................................................................... 42
TABLE 24: STATUS OF THE NETLIGHT..................................................................................................................... 42
TABLE 25: PIN DEFINITION OF THE STATUS........................................................................................................... 43
TABLE 26: DEFINITION OF THE RF_SYNC PIN........................................................................................................ 43
TABLE 27: RECOMMENDED TVS COMPONENT ..................................................................................................... 44
TABLE 28: CURRENT CONSUMPTION (CSCLK=1).................................................................................................. 45
TABLE 29: CURRENT CONSUMPTION (CSCLK=0).................................................................................................. 46
TABLE 30: SERIAL PORT PIN DEFINITION ............................................................................................................... 49
TABLE 31: SERIAL PORT CHARACTERISTICS......................................................................................................... 49
TABLE 32: RECOMMENDED BPF COMPONENT...................................................................................................... 52
TABLE 33: DEFAULT CONFIGURATION OF GNSS (FULL ON MODE) .................................................................. 52
TABLE 34: ABSOLUTE MAXIMUM RATINGS........................................................................................................... 58
TABLE 35: RECOMMENDED OPERATING CONDITIONS ....................................................................................... 58
TABLE 36: DIGITAL INTERFACE CHARACTERISTICS ........................................................................................... 58
TABLE 37: SIM CARD INTERFACE CHARACTERISTICS........................................................................................ 59
TABLE 38: SIM_VDD CHARACTERISTICS................................................................................................................ 59
TABLE 39: VDD_EXT CHARACTERISTICS ............................................................................................................... 59
TABLE 40: CURRENT CONSUMPTION ...................................................................................................................... 59
TABLE 41: THE ESD CHARACTERISTICS (TEMPERATURE: 25℃, HUMIDITY: 45 %) ....................................... 60
TABLE 42: GSM850 AND EGSM900 CONDUCTED RF OUTPUT POWER.............................................................. 61
TABLE 43: DCS1800 AND PCS1900 CONDUCTED RF OUTPUT POWER............................................................... 61
TABLE 44: CONDUCTED RF RECEIVE SENSITIVITY ............................................................................................. 62
TABLE 45: OPERATING FREQUENCIES..................................................................................................................... 62
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TABLE 46: MOISTURE SENSITIVITY LEVEL AND FLOOR LIFE ........................................................................... 64
TABLE 47: BAKING REQUIREMENTS ....................................................................................................................... 64
TABLE 48: TRAY SIZE ................................................................................................................................................... 65
TABLE 49: SMALL CARTON SIZE............................................................................................................................... 66
TABLE 50: BIG CARTON SIZE ..................................................................................................................................... 66
TABLE 51: RELATED DOCUMENTS ........................................................................................................................... 67
TABLE 52: TERMS AND ABBREVIATIONS................................................................................................................ 68
TABLE 53: SAFETY CAUTION..................................................................................................................................... 70
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Figure Index
FIGURE 1: SIM868 BLOCK DIAGRAM ....................................................................................................................... 15
FIGURE 2: PIN OUT DIAGRAM (TOP VIEW) ............................................................................................................. 16
FIGURE 3: DIMENSIONS OF SIM868 (UNIT: MM) .................................................................................................... 19
FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE ...................................................................................... 20
FIGURE 5: RECOMMENDED SMT STENCIL FOOTPRINT OUTLINE .................................................................... 21
FIGURE 6: ALL-IN-ONE MODE DIAGRAM................................................................................................................ 22
FIGURE 7: STAND-ALONE MODE DIAGRAM .......................................................................................................... 23
FIGURE 8: REFERENCE CIRCUIT OF THE GSM_VBAT INPUT.............................................................................. 24
FIGURE 9: THE MINIMAL GSM_VBAT VOLTAGE REQUIREMENT AT GSM_VBAT DROP ............................... 24
FIGURE 10: REFERENCE CIRCUIT OF THE LDO POWER SUPPLY ....................................................................... 25
FIGURE 11: REFERENCE CIRCUIT OF THE DC-DC POWER SUPPLY ................................................................... 25
FIGURE 12: THE MINIMA L V B AT VOLTAGE REQUIREMENT AT VBAT DROP .................................................. 25
FIGURE 13: POWERED ON/OFF GSM USING TRANSISTOR .................................................................................. 26
FIGURE 14: POWERED ON/OFF GSM USING BUTTON........................................................................................... 26
FIGURE 15: TIMING OF POWER ON GSM ................................................................................................................. 26
FIGURE 16: TIMING OF POWER OFF GSM................................................................................................................ 27
FIGURE 17: TIMING OF RESTART GSM..................................................................................................................... 28
FIGURE 18: CONNECTION OF THE SERIAL INTERFACES ..................................................................................... 31
FIGURE 19: RESISTOR M AT C HI NG CIRCUIT ........................................................................................................... 31
FIGURE 20 : DIODE ISOLATION CIRCUIT................................................................................................................. 31
FIGURE 21: TX LEVEL MATCHING CIRCUIT ........................................................................................................... 32
FIGURE 22: RX LEVEL MATCHING CIRCUIT ........................................................................................................... 32
FIGURE 23: USB REFERENCE CIRCUIT .................................................................................................................... 32
FIGURE 24: CONNECTION FOR SOFTWARE UPGRADING.................................................................................... 33
FIGURE 25: UART1_RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER ....................................................... 34
FIGURE 26: UART1_RI BEHAVIOUR OF URC OR RECEIVE SMS.......................................................................... 34
FIGURE 27: UART1_RI BEHAVIOUR AS A CALLER................................................................................................. 34
FIGURE 28: SPEAKER REFERENCE CIRCUIT .......................................................................................................... 35
FIGURE 29: MICROPHONE REFERENCE CIRCUIT .................................................................................................. 36
FIGURE 30: REFERENCE CIRCUIT OF THE 8-PIN SIM CARD HOLDER............................................................... 38
FIGURE 31: REFERENCE CIRCUIT OF THE 6-PIN SIM CARD HOLDER............................................................... 38
FIGURE 32: MOLEX 91228 SIM CARD HOLDER....................................................................................................... 39
FIGURE 33: AMPHENOL C707 10M006 512 SIM CARD HOLDER........................................................................... 40
FIGURE 34: SD REFERENCE CIRCUIT ....................................................................................................................... 41
FIGURE 35: REFERENCE CIRCUIT OF NETLIGHT................................................................................................... 42
FIGURE 36: RF_SYNC SIGNAL DURING TRANSMIT BURST ................................................................................ 43
FIGURE 37: GSM ANTENNA MATCHING CIRCUIT.................................................................................................. 44
FIGURE 38: GSM ANTENNA MATCHING CIRCUIT WITHOUT RF CONNECTOR ............................................... 44
FIGURE 39: BLUETOOTH ANTENNA MATCHING CIRCUIT .................................................................................. 45
FIGURE 40: REFERENCE CIRCUIT OF THE GPS_VB AT I N P U T ............................................................................. 47
FIGURE 41: RTC SUPPLY FROM RECHARGEABLE BATTERY .............................................................................. 48
FIGURE 42: RTC SUPPLY FROM EXTERNAL POWER ............................................................................................. 48
FIGURE 43: POWER ON/OFF GNSS............................................................................................................................. 49
FIGURE 44: TIMING OF POWER ON GNSS................................................................................................................ 49
FIGURE 45: TIMING OF POWER OFF GNSS .............................................................................................................. 49
FIGURE 46: CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING FOR GNSS .............................. 50
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FIGURE 47: CONNECTION FOR SOFTWARE UPGRADING IN ALL-IN-ONE MODE........................................... 50
FIGURE 48: 1PPS APPLICATION CIRCUIT................................................................................................................. 51
FIGURE 49: GNSS PASSIVE ANTENNA MATCHING CIRCUIT ............................................................................... 51
FIGURE 50: GNSS ACTIVE ANTENNA MATCHING CIRCUIT................................................................................. 52
FIGURE 51: PIN ASSIGNMENT.................................................................................................................................... 56
FIGURE 52: TOP AND BOTTOM VIEW OF SIM868 ................................................................................................... 63
FIGURE 53: TYPICAL SOLDER REFLOW PROFILE OF LEAD-FREE PROCESS .................................................. 63
FIGURE 54: PACKAGING INTRODUCE...................................................................................................................... 65
FIGURE 55: MODULE TRAY DRAWING..................................................................................................................... 65
FIGURE 56: SMALL CARTON DRAWING................................................................................................................... 66
FIGURE 57: BIG CARTON DRAWING ......................................................................................................................... 66
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Version History
Date
Version
Description of change
Author
2016-06-20 1.00 Origin Yanwu.Wang;
Xiaoxu.Chen
2016-08-01 1.01
1. Update figure 1
2. Add voltage range of GPS_VBAT
3. Add voltage range of VRTC
4. Add voltage range of GNSS_EN
5. Add Recommenced SMT stencil footprint
6. Delete Over-Temperature or Under- Temperature Power off
7. Change PWRKEY pin from at least 1 second to
1.5 second for
power off the module
8. Add GNSS software update part
9. Delete Multiplexing function
10. Add BPF component in GNSS part
Yanwu.Wang;
Xiaoxu.Chen
2016-11-24 1.02
1. Add Application Mode
2. Add Power Supply of GNSS
3. Add Power Saving Mode of GNSS
4. Add operation mode of GNSS
5. Modify Backup Power of GNSS
6. Add software upgrading in Simultaneous mode
7. Add Application of GNSS
8. Add A-GPS、Fast-Fix、Easy-Mode、SBAS、GLP
Yanwu.Wang;
Xiaoxu.Chen
2017-02-18 1.03
1. Update Tab 3, Tab 6(GPS_VBAT 2.9V~4.4V)
2. Update backup current to 8uA, stop current to 590uA
3. Update periodic mode
4. Update AlwaysLocateTM mode
5. Delete the blank of document
Ming.zhu
2017-06-08 1.04
1. Add the description of SIM868E
2. Add Chapter 5.16 for BT interface
3. Add Chapter 5.17 for BLE power consumption
Ming.zhu
2017-06-13 1.05 Change the name of document Ming.zhu
2017-07-13 1.06 1. Add one note on Page 46
2. Add Chapter 10 for packaging information Ming.zhu
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1. Introduction
This document defines the SIM868 series module and describes its hardware interface in great detail. The
SIM868 series module includes two variants (SIM868 and SIM868E) currently. Both of them have the same
function except BLE, which is particular for SIM868E. SIM868 series is hereinafter uniformly referred to as the
SIM868 except in BT chapters.
The document can help customers understand SIM868 interface specifications, electrical and mechanical details.
With the help of this document and other SIM868 application notes, customer guide, customers can use SIM868
to design various applications conveniently.
2. SIM868 Overview
Designed for global market, SIM868 is integrated with a high performance GSM/GPRS part and a GNSS part.
The GSM part is a quad-band GSM/GPRS that works on frequencies GSM 850 MHz, EGSM 900MHz, DCS
1800MHz and PCS 1900MHz. GSM features GPRS multi-slot class 12/class 10 (optional) and supports the
GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.
The GNSS part solution offers best-in-class acquisition and tracing sensitivity, Time-To-First-Fix (TTFF) and
accuracy. With built-in LNA, GNSS doesn’t need external LNA. GNSS can track as low as -167dBm signal even
without network assistance. The GNSS has excellent low power consumption characteristic (acquisition 24mA,
tracking 22mA). GNSS supports various location and navigation applications, including autonomous GPS,
GLONASS, BEIDOU, QZSS, SBAS (WAAS, EGNOS, GAGAN, and MSAS) and A-GPS.
With a tiny configuration of 17.6*15.7*2.3mm, SIM868 can meet almost all the space requirements in
customers’ applications, such as smart phone, PDA and other mobile devices.
SIM868 has a SMT+LGA package with 77 pads, and provides all hardware interfaces between the module and
customers’ boards.
One three-line serial port, one full modem serial port and one GNSS serial port.
USB interface
Audio channels which include a microphone input and two speakers output
Programmable general purpose input and output
Two SIM card interfaces
SD card interface
I2C interface
ADC interface
Support GNSS function
33tracking/99 acquisition-channel GNSS receiver
12 multi-tone active interference cancellers and jamming elimination
Max fixed update rate up to 10 HZ (1Hz default)
Accuracy 2.5m CEP
SIM868 is designed with power saving technique so that the current consumption is as low as 0.65 mA in sleep
mode (with GNSS part power off).
SIM868 integrates TCP/IP protocol and extended TCP/IP AT commands which are very useful for data transfer
applications. For details about TCP/IP applications, please refer to document [3].
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2.1. SIM868 Key Features
Table 1: Key Features of GSM Part
Feature Implementation
Power supply 3.4V ~4.4V
Power saving Typical power consumption in sleep mode is 0.65mA (AT+CFUN=0)
Frequency bands
Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. SIM868 can search
the 4 frequency bands automatically. The frequency bands can also be set by
AT command “AT+CBAND”. For details, please refer to document [1].
Compliant to GSM Phase 2/2+
Transmitting power
Class 4 (2W) at GSM 850 and EGSM 900
Class 1(1W) at DCS 1800 and PCS 1900
GPRS connectivity
GPRS multi-slot class 12(default)
GPRS multi-slot class 1~12 (option)
Temperature range
Normal operation:-40°C ~ +85°C

Storage temperature -45°C ~ +90°C
Data GPRS
GPRS data downlink transfer: max. 85.6 kbps
GPRS data uplink transfer: max. 85.6 kbps
Coding scheme: CS-1, CS-2, CS-3 and CS-4
PAP protocols for PPP connect
Integrate the TCP/IP protocol
 Support Packet Broadcast Control Channel (PBCCH)
USSD

Unstructured Supplementary Services Data (USSD) support
SMS
MT, MO, CB, Text and PDU mode.
SMS storage: SIM card
SIM interface
Support SIM card: 1.8V, 3V
FLASH 32Mbit
RAM
32Mbit
Audio features
Speech codec modes:
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 port
Serial port:
Default one full modem serial port
Can be used for AT commands or data stream
Support RTS/CTS hardware handshake and software ON/OFF flow control
Multiplex ability according to GSM 07.10 Multiplexer Protocol
Autobauding supports baud rate from 1200 bps to 115200bps
upgrading firmware
USB port:
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Can be used for debugging and upgrading firmware
Phonebook management Support phonebook types: SM, FD, LD, RC, ON, MC.
SIM application toolkit GSM 11.14 Release 99
Physical characteristics
Size:17.6*15.7*2.3mm
Weight:1.5g
Firmware upgrade Full modem serial port or USB interface
Table 2: 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
Table 3: Key Features of GNSS Part
Parameter Description Performance
Min Typ Max Unit
Power supply
Power supply
2.9
3
4.4
V
Horizontal Position
Accuracy(1) Autonomous <2.5 m
Velocity Accuracy
(2)
Without Aid 0.1 m/s
Acceleration Accuracy Without Aid 0.1 m/s
2
Accuracy of 1PPS
10
nS
Backup batter voltage
VRTC
2.3
4.3
V
Dynamic Performance
Maximum Altitude
18000
m
Maximum Velocity 515 m/s
Maximum Acceleration 4 G
TTFF with GPS
only(3)
Hot start <1 s
Warm start 21.4 s
Cold start
22.3
s
TTFF with
GLONASS only(3)
Hot start <1 s
Warm start
21.2
s
Cold start 21.68 s
TTFF with GPS and
GLONASS (3)
Hot start <1 s
Warm start 21.54 s
Cold start 21.67 s
A-GPS TTFF(EPO in
flash mode)
Hot start <1 s
Warm start
/
s
Cold start / s
A-GPS TTFF(Easy
mode)
Hot start <1 s
Warm start 1.4 s
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Cold start 13.6 s
Sensitivity with GPS
only mode
Autonomous
acquisition(cold start)
-149 dBm
Re-acquisition -161 dBm
Tracking
-167
dBm
Sensitivity with
GLONASS only mode
Autonomous
acquisition(cold start)
-147 dBm
Re-acquisition
-155
dBm
Tracking -160 dBm
Sensitivity with GPS
and GLONASS
Autonomous
acquisition(cold start)
-149 dBm
Re-acquisition
-161
dBm
Tracking
-167
dBm
Receiver
Channels 33/99
Update rate
10
Hz
Tracking L1, CA Code
Protocol support
NMEA
Power consumption
With GPS only
mode(4)
Acquisition 24.5 mA
Continuous tracking
22.2
mA
GLP current 12 mA
Sleep current 6.5 mA
Stop current 490 uA
Backup current 8 uA
Power consumption
With BD only mode(4)
Acquisition 31 mA
Continuous tracking
31.2
mA
GLP current 12 mA
Sleep current 6.5 mA
Stop current 490 uA
Backup current 8 uA
Power consumption
With GLONASS only
mode(4)
Acquisition
22.4
mA
Continuous tracking
27.3
mA
GLP current
12
mA
Sleep current 6.5 mA
Stop current 490 uA
Backup current 8 uA
Power consumption
With GPS and
GLONASS (4)
Acquisition 31 mA
Continuous tracking
26
mA
GLP current 12 mA
Sleep current
6.5
mA
Stop current 590 uA
Backup current 8 uA
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Power consumption
With GPS and BD (4)
Acquisition 31.2 mA
Continuous tracking 25.8 mA
GLP current 12 mA
Sleep current 6.5 mA
Stop current 490 uA
Backup current
8
uA
(1) 50% 24hr static, -130dBm
(2) 50% at 30m/s
(3) GPS signal level: -130dBm
(4) Single Power supply 3V@-130dBm
2.2. Operating Modes
Table 4 summarizes the various operating modes of GSM:
Table 4: Overview of GSM operating modes
Mode
Function
Normal
operation
GSM/GPRS
SLEEP
Module will automatically go into sleep mode if the conditions of sleep
mode are enabling and there aren’t
on air and 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 sleep mode, the module can still receive paging message and SMS.
GSM IDLE Software is active. Module is registered to the GSM network and ready to
communicate.
GSM TALK
Connection between two subscribers is in progress. In this case, the power
consumption depends on network settings such as DTX off/on,
FR/EFR/HR, hopping sequences and antenna.
GPRS
STANDBY
Module is ready for GPRS data transfer, but no data is currently sent or
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 related with network settings (e.g. power control
level); uplink/downlink data rates and GPRS configuration (e.g. used
multi-slot settings).
Power off
Normal power off by sending AT command “AT+CPOWD=1” or using the PWRKEY. The
power management unit shuts down the power
supply for the baseband part of the module.
Software is not active. The serial port is not accessible. Power supply (connected to 3V)
remains applied.
Minimum
functionality
mode
AT command “AT+CFUN” can be used to set the module to a minimum functionality mode
without removing the power supply. In this mode, the RF part of the module will not work
or the SIM card will not be accessible, or both RF part and SIM card will be closed, and the
serial port is still accessible. The power consumption in this mode
is lower than normal
mode.
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Table 5: Overview of GNSS operating modes
Note: X means no matter GPS_VBAT is existed or not.
2.3. Functional Diagram
Figure 1 shows the block diagram of SIM868:
GSM baseband
PMU
The GSM Radio Frequency part
Antenna interface
GNSS interface
Other interface
Figure 1: SIM868 block diagram
Mode GPS_VBAT GNSS_EN VRTC Main clock RTC clock
Full on on H on on on
Stop on H on off on
Backup X L on off on
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3. Package Information
3.1. Pin Out Diagram
MCCK
UART1_DTR
USB_DP
GPS_VBAT
GSM_VBAT
ADC
UART1_RXD
PWRKEY
UART1_CTS
UART1_TXD
UART1_RTS
SCL SDA
UART1_DCD
NETLIGHT
SIM1_RSTSIM1_CLK
SIM1_DET SIM1_DATA BT_ANT
SIM2_CLKSIM2_DET SIM2_DATA SIM2_RST SIM2_VDD
UART2_TXD
SPK1P
VRTC
MICP
MICN USB_VBUS
USB_DM
GSM_ANT
STATUS
SIM1_VDD
MCCA3
GND
UART2_RXD
GND
GPS_RXD
GNSS_EN
1PPS
GPIO2
GPS_TXD
13
SPK1N
UART1_RI
GPS_ANT
14 15 16 2117 18 19 20
22
23
24
25
26
27
28
29
30
31
32
33
37 36 35 34
1
42 41 40 39 38
5
4
2
3
6
11
10
9
8
7
51
12 5352 55
54 57
56
58
62
61
60
59
67 66 65 64 63
46
45
44
43
49
48
47
50
VDD_EXT
GND
GND
GND
GND
GND
GND
GPIO1
GND
GND
GND
GND
UART1_DTR
RF_SYNC
GND
GND
SPK2P
68
MCCM0
MCCA1
SPK2N
MCCA2
MCCA0
GND GNDGND
GNDGNDGND
GND
GNDGND
7669 75
70 77 74
71 72 73
Figure 2: Pin out Diagram (Top view)
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3.2. Pin Description
Table 6: Pin description
Pin name
Pin number
I/O
Description
Comment
Power supply
GPS_VBAT 34 I Power supply for GNSS 2.9V ~4.4V
GSM_V BAT 35 I Power supply for GSM 3.4V ~4.4V
VDD_EXT 40 O 2.8V power output If it is unused, keep open.
GND
8,13,19,21,27,30,
31,33,36,37,45,63,
66,67,69,70,71,72,
73,74,75,76,77
Ground 36、37 pins
recommend for
G S M _ V B AT.
Power on/off
PWRKEY 39 I
PWRKEY should be pulled low
and then released to power on/off
the module.
Internally pulled up to 3V
Audio interface
MICP 9 I Differential audio input
If these pins are unused,
keep open.
MICN 10
SPK1P 11
O Differential audio output
SPK1N 12
SPK2P 44
SPK2N 43
GNSS interface
GPS_RXD 62 I Receive data
If these pins are unused,
keep open.
GPS_TXD 61 O Transmit data
1PPS 60 O Time Mark outputs timing pulse
GNSS_EN 59 I GNSS power enable
VRTC 28 I/O Power supply for GNSS RTC
It is recommended to
connect with a battery.
SD interface
MCCA3 46 I/O
SD serial data I/O
If these pins are unused,
keep open.
MCCA2 47 I/O
MCCA1 48 I/O
MCCA0 49 I/O
MCCK 50 I/O SD serial clock
MCCM0 51 I/O SD command output
GPIO
NETLIGHT 41 O Network status
If these pins are unused,
keep open.
S TAT U S 42 O Power on status
GPIO1 57 I/O
Programmable general purpose
input and output.
GPIO2
58
I/O
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Serial port
UART1_DTR 6 I Data terminal ready
If these pins are unused,
keep open.
UART1_RI 7 O Ring indicator
UART1_DCD 5 O Data carrier detect
UART1_CTS 4 O Clear to send
UART1_RTS
3
I
Request to send
UART1_TXD 1 O Transmit data
UART1_RXD 2 I Receive data
UART2_TXD 22 O Transmit data
UART2_RXD 23 I Receive data
Debug interface
USB_VBUS
24
I
Debug and download
If these pins are unused,
keep open.
USB_DP 25 I/O
USB_DM 26 I/O
ADC
ADC 38 I
10bit general analog to digital
converter
If it is unused, keep open.
I2C
SDA 64 I/O I2C serial bus data S
hould be pulled up to 2.8V
via 4.7K resistor externally
SCL 65 O I2C serial bus clock
SIM card interface
SIM1_VDD 18 O
Voltage supply for SIM card.
Support 1.8V or 3V SIM card. All signals of SIM interface
should be protec
ted against
ESD.
SIM1_DATA 15 I/O SIM data input/output
SIM1_CLK 16 O SIM clock
SIM1_RST 17 O SIM reset
SIM1_DET
14
I
SIM card detection
If it is unused, keep open.
SIM2_VDD 56 O
Voltage supply for SIM card.
Support 1.8V or 3V SIM card All signals of SIM interface
should be protected against
ESD.
SIM2_DATA 53 I/O SIM data input/output
SIM2_CLK 54 O SIM clock
SIM2_RST
55
O
SIM reset
SIM2_DET
52
I
SIM card detection
If it is unused, keep open.
Antenna interface
GSM_ANT
32
I/O
Connect GSM antenna
If these pins are unused,
keep open.
BT_ANT 20 I/O Connect Bluetooth antenna
GPS_ANT 68 I Connect GNSS antenna
Synchronizing signal of RF
RF_SYNC 29 O Synchronizing signal of RF
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3.3. Package Dimensions
Figure 3: Dimensions of SIM868 (Unit: mm)
SIMCOM CONFIDENTIAL FILE