SIM868_Hardware_Design_V1.01
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Document Title
SIM868 Hardware Design
Version
V1.01
Date
2016-08-01
Status
Release
Document Control ID
SIM868_Hardware_Design_V1.01
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. 2016
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Contents
1.
Introduction.......................................................................................................... 8
2.
SIM868 Overview ................................................................................................ 8
2.1.
2.2.
2.3.
2.4.
3.
Package Information ......................................................................................... 14
3.1.
3.2.
3.3.
4.
SIM868 ................................................................................................................................. 9
SIM868 Key Features ........................................................................................................... 9
Operating Mode .................................................................................................................. 11
Functional Diagram............................................................................................................. 12
Pin Out Diagram ................................................................................................................. 14
Pin Description.................................................................................................................... 14
Package Dimensions ........................................................................................................... 17
Application Interface ......................................................................................... 20
4.1.
4.1.1.
4.1.2.
4.2.
4.2.1.
4.2.2.
4.3.
4.3.1.
4.3.2.
4.3.3.
4.3.4.
4.3.5.
4.4.
4.5.
4.5.1
4.5.2
4.5.3
4.5.4
4.6.
4.7.
4.7.1.
4.7.2.
4.7.3.
4.7.4.
4.8.
4.8.1.
4.8.2.
4.8.3.
4.9.
Power Supply ...................................................................................................................... 20
Power Supply Pin ................................................................................................................................ 21
Monitoring Power Supply ................................................................................................................... 22
Power on/off SIM868.......................................................................................................... 22
Power on SIM868 ............................................................................................................................... 22
Power off SIM868 ............................................................................................................................... 23
Power Saving Mode ............................................................................................................ 24
Minimum Functionality Mode ............................................................................................................ 24
Sleep Mode 1 (AT+CSCLK=1) .......................................................................................................... 25
Wake Up SIM868 from Sleep Mode 1 ................................................................................................ 25
Sleep Mode 2 (AT+CSCLK=2) .......................................................................................................... 25
Wake Up SIM868 from Sleep Mode 2 ................................................................................................ 25
Power Saving Mode ............................................................................................................ 26
Serial Port and USB Interface ............................................................................................. 26
Function of Serial Port ........................................................................................................................ 27
Serial Interfaces ................................................................................................................................... 28
Debug Interface ................................................................................................................................... 29
Software Upgrade................................................................................................................................ 30
UART1_RI Behaviors ......................................................................................................... 31
Audio Interfaces .................................................................................................................. 32
Speaker Interfaces Configuration ........................................................................................................ 33
Microphone Interfaces Configuration ................................................................................................. 33
Audio Electronic Characteristic .......................................................................................................... 33
TDD .................................................................................................................................................... 34
SIM Card Interface.............................................................................................................. 34
SIM Card Application ......................................................................................................................... 34
SIM Card Design Guide ...................................................................................................................... 36
Design Considerations for SIM Card Holder ...................................................................................... 36
SD Interface ........................................................................................................................ 38
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4.10.
4.11.
4.12.
4.13.
4.14.
4.15.
I2C Bus ............................................................................................................................... 38
ADC .................................................................................................................................... 38
Network Status Indication................................................................................................... 39
Operating Status Indication ................................................................................................. 40
RF Synchronization Signal ................................................................................................. 40
GNSS .................................................................................................................................. 40
4.15.1.
4.15.2.
4.15.3.
GNSS Overview .............................................................................................................................. 40
Power on/down GNSS ..................................................................................................................... 41
1PPS Output..................................................................................................................................... 41
4.16. Antenna Interface ................................................................................................................ 41
4.16.1.
4.16.2.
5.
GSM Antenna Interface ................................................................................................................... 41
GNSS Antenna Interface.................................................................................................................. 42
PCB Layout ........................................................................................................ 44
5.1
5.2
Pin Assignment ................................................................................................................... 44
Principle of PCB Layout ..................................................................................................... 45
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
6.
Antenna Interface ................................................................................................................................ 45
Power Supply ...................................................................................................................................... 45
SIM Card Interface .............................................................................................................................. 45
Audio Interface.................................................................................................................................... 45
Others .................................................................................................................................................. 45
Electrical, Reliability and Radio Characteristics ........................................... 46
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
Absolute Maximum Ratings ............................................................................................... 46
Recommended Operating Conditions ................................................................................. 46
Digital Interface Characteristics.......................................................................................... 46
SIM Card Interface Characteristics ..................................................................................... 47
SIM_VDD Characteristics .................................................................................................. 47
VDD_EXT Characteristics ................................................................................................. 47
Current Consumption（VBAT=4.0V） ............................................................................. 47
Electro-Static Discharge ..................................................................................................... 48
Radio Characteristics .......................................................................................................... 49
6.9.1
6.9.2
6.9.3
7.
Manufacturing ................................................................................................... 51
7.1.
7.2.
7.3.
7.4.
8.
I.
II.
III.
Module RF Output Power ................................................................................................................... 49
Module RF Receive Sensitivity........................................................................................................... 50
Module Operating Frequencies ........................................................................................................... 50
Top and Bottom View of SIM868 ...................................................................................... 51
Typical Solder Reflow Profile ............................................................................................ 51
The Moisture Sensitivity Level ........................................................................................... 52
Baking Requirements .......................................................................................................... 52
Appendix ............................................................................................................. 53
Related Documents ............................................................................................................. 53
Terms and Abbreviations .................................................................................................... 54
Safety Caution ..................................................................................................................... 56
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Table Index
TABLE 1: MODULE INFORMATION ............................................................................................................................. 9
TABLE 2: SIM868 KEY FEATURES ................................................................................................................................ 9
TABLE 3: GNSS ENGINE PERFORMANCE ................................................................................................................ 10
TABLE 4: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ............................ 11
TABLE 5: OVERVIEW OF OPERATING MODES ........................................................................................................ 11
TABLE 6: PIN DESCRIPTION ....................................................................................................................................... 14
TABLE 7: RECOMMENDED ZENER DIODE .............................................................................................................. 20
TABLE 8: THE CURRENT CONSUMPTION OF FUNCTION MODE ........................................................................ 24
TABLE 9: SERIAL PORT AND USB PIN DEFINITION ............................................................................................... 27
TABLE 10: SERIAL PORT CHARACTERISTICS ......................................................................................................... 27
TABLE 11: USB_VBUS OPERATION VOLTAGE ........................................................................................................ 30
TABLE 12: RI BEHAVIORS ........................................................................................................................................... 31
TABLE 13: AUDIO INTERFACE DEFINITION ............................................................................................................ 32
TABLE 14: PERFORMANCE OF AUDIO AMPLIFIER ................................................................................................ 32
TABLE 15: MICROPHONE INPUT CHARACTERISTICS........................................................................................... 33
TABLE 16: AUDIO OUTPUT CHARACTERISTICS .................................................................................................... 34
TABLE 17: SIM PIN DEFINITION................................................................................................................................. 34
TABLE 18: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) .............................................................................. 36
TABLE 19: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER)....................................................................... 37
TABLE 20: PIN DEFINITION OF THE I2C ................................................................................................................... 38
TABLE 21: PIN DEFINITION OF THE ADC ................................................................................................................. 38
TABLE 22: ADC SPECIFICATION ................................................................................................................................ 39
TABLE 23: PIN DEFINITION OF THE NETLIGHT ..................................................................................................... 39
TABLE 24: STATUS OF THE NETLIGHT PIN.............................................................................................................. 39
TABLE 25: PIN DEFINITION OF THE STATUS ........................................................................................................... 40
TABLE 26: DEFINITION OF THE RF_SYNC PIN........................................................................................................ 40
TABLE 27: RECOMMENDED TVS COMPONENT ..................................................................................................... 42
TABLE 28: ABSOLUTE MAXIMUM RATINGS........................................................................................................... 46
TABLE 29: DIGITAL INTERFACE CHARACTERISTICS ........................................................................................... 46
TABLE 30: SIM CARD INTERFACE CHARACTERISTICS ........................................................................................ 47
TABLE 31: SIM_VDD CHARACTERISTICS ................................................................................................................ 47
TABLE 32: VDD_EXT CHARACTERISTICS ............................................................................................................... 47
TABLE 33: CURRENT CONSUMPTION ...................................................................................................................... 47
TABLE 34: THE ESD CHARACTERISTICS (TEMPERATURE: 25℃, HUMIDITY: 45 %) ....................................... 48
TABLE 35: GSM850 AND EGSM900 CONDUCTED RF OUTPUT POWER .............................................................. 49
TABLE 36: DCS1800 AND PCS1900 CONDUCTED RF OUTPUT POWER ............................................................... 49
TABLE 37: CONDUCTED RF RECEIVE SENSITIVITY ............................................................................................. 50
TABLE 38: MOISTURE SENSITIVITY LEVEL AND FLOOR LIFE ........................................................................... 52
TABLE 39: BAKING REQUIREMENTS ....................................................................................................................... 52
TABLE 40: RELATED DOCUMENTS ........................................................................................................................... 53
TABLE 41: TERMS AND ABBREVIATIONS ................................................................................................................ 54
TABLE 42: SAFETY CAUTION ..................................................................................................................................... 56
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Figure Index
FIGURE 1: SIM868 FUNCTIONAL DIAGRAM ........................................................................................................... 13
FIGURE 2: PIN OUT DIAGRAM (TOP VIEW) ............................................................................................................. 14
FIGURE 3: DIMENSIONS OF SIM868 (UNIT: MM) .................................................................................................... 17
FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE (UNIT: MM) ................................................................ 18
FIGURE 5: RECOMMENDED SMT STENCIL FOOTPRINT OUTLINE (UNIT: MM) .............................................. 19
FIGURE 6: REFERENCE CIRCUIT OF THE VBAT INPUT......................................................................................... 20
FIGURE 7: REFERENCE CIRCUIT OF THE LDO POWER SUPPLY ......................................................................... 20
FIGURE 8: REFERENCE CIRCUIT OF THE DC-DC POWER SUPPLY ..................................................................... 21
FIGURE 9: VBAT VOLTAGE DROP DURING TRANSMIT BURST ........................................................................... 21
FIGURE 10: THE MINIMAL VBAT VOLTAGE REQUIREMENT AT VBAT DROP .................................................. 21
FIGURE 11: POWERED ON/DOWN MODULE USING TRANSISTOR ..................................................................... 22
FIGURE 12: POWERED ON/DOWN MODULE USING BUTTON ............................................................................. 22
FIGURE 13: TIMING OF POWER ON MODULE ......................................................................................................... 22
FIGURE 14: TIMING OF POWER OFF SIM868 BY PWRKEY ................................................................................... 23
FIGURE 15: TIMING OF RESTART SIM868 ................................................................................................................ 24
FIGURE 16: RTC SUPPLY FROM CAPACITOR........................................................................................................... 26
FIGURE 17: RTC SUPPLY FROM NON-CHARGEABLE BATTERY ......................................................................... 26
FIGURE 18: RTC SUPPLY FROM RECHARGEABLE BATTERY .............................................................................. 26
FIGURE 19: CONNECTION OF THE SERIAL INTERFACES ..................................................................................... 28
FIGURE 20: RESISTOR MATCHING CIRCUIT ........................................................................................................... 28
FIGURE 21 : DIODE ISOLATION CIRCUIT ................................................................................................................. 29
FIGURE 22: TX LEVEL MATCHING CIRCUIT ........................................................................................................... 29
FIGURE 23: RX LEVEL MATCHING CIRCUIT ........................................................................................................... 29
FIGURE 24: USB REFERENCE CIRCUIT .................................................................................................................... 30
FIGURE 25: CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING .................................................. 30
FIGURE 26: CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING .................................................. 31
FIGURE 27: UART1_RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER ....................................................... 31
FIGURE 28: UART1_RI BEHAVIOUR OF URC OR RECEIVE SMS .......................................................................... 32
FIGURE 29: UART1_RI BEHAVIOUR AS A CALLER................................................................................................. 32
FIGURE 30: SPEAKER REFERENCE CIRCUIT .......................................................................................................... 33
FIGURE 31: MICROPHONE REFERENCE CIRCUIT .................................................................................................. 33
FIGURE 32: REFERENCE CIRCUIT OF THE 8-PIN SIM CARD HOLDER............................................................... 35
FIGURE 33: REFERENCE CIRCUIT OF THE 6-PIN SIM CARD HOLDER............................................................... 35
FIGURE 34: MOLEX 91228 SIM CARD HOLDER ...................................................................................................... 36
FIGURE 35: AMPHENOL C707 10M006 512 SIM CARD HOLDER ........................................................................... 37
FIGURE 36: SD REFERENCE CIRCUIT ....................................................................................................................... 38
FIGURE 37: REFERENCE CIRCUIT OF NETLIGHT .................................................................................................. 39
FIGURE 38: RF_SYNC SIGNAL DURING TRANSMIT BURST ................................................................................ 40
FIGURE 39: GSM ANTENNA MATCHING CIRCUIT ................................................................................................. 41
FIGURE 40: GSM ANTENNA MATCHING CIRCUIT WITHOUT RF CONNECTOR ............................................... 42
FIGURE 41: GNSS PASSIVE ANTENNA MATCHING CIRCUIT ............................................................................... 43
FIGURE 42: GNSS ACTIVE ANTENNA MATCHING CIRCUIT................................................................................. 43
FIGURE 43: PIN ASSIGNMENT .................................................................................................................................... 44
FIGURE 44: TOP AND BOTTOM VIEW OF SIM868 ................................................................................................... 51
FIGURE 45: TYPICAL SOLDER REFLOW PROFILE OF LEAD-FREE PROCESS .................................................. 51
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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
Yanwu.Wang;
Xiaoxu.Chen
power off the module
8.
Add GNSS software update part
9.
Delete Multiplexing function
10. Add BPF component in GNSS part
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1. Introduction
This document describes SIM868 hardware interface in great detail. The document can help customer to quickly
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
quickly.
2. SIM868 Overview
Designed for global market, SIM868 is integrated with a high performance GSM/GPRS engine and a GNSS
engine. SIM868 is a quad-band GSM/GPRS module that works on frequencies GSM 850MHz, EGSM 900MHz,
DCS 1800MHz and PCS 1900MHz. SIM868 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 solution offers best-in-class acquisition and tracing sensitivity, Time-To-First-Fix (TTFF) and
accuracy. With built-in LNA, SIM868 doesn’t need external LNA. SIM868 can track as low as -167dBm signal
even without network assistance. The SIM868 has excellent low power consumption characteristic (acquisition
24mA, tracking 21mA). SIM868 supports various location and navigation applications, including autonomous
GPS, GLONASS, BEIDOU, QZSS, SBAS (WAAS, EGNOS, GAGAN, 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 is a SMT+LGA package with 77 pads, and provides all hardware interfaces between the module and
customers’ boards.
One 3 lines serial port and one full modem serial port;
GNSS Serial port
USB interface which can be used for debugging and upgrading firmware;
Audio channels which include a microphone input and two speakers output;
Programmable general purpose input and output;
Two SIM cards interface;
Support GNSS function;
33tracking/99 acquisition-channel GNSS receiver
SD card interface;
I2C interface;
ADC interface.
SIM868 is designed with power saving technique so that the current consumption is as low as 0.65 mA in sleep
mode (with GNSS engine powered down).
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 [2].
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2.1. SIM868
Table 1: Module Information
Information
SIM868
GSM
850,900,1800 and 1900MHz
GNSS
GNSS interface
FLASH
32Mbit
RAM
32Mbit
2.2. SIM868 Key Features
Table 2: SIM868 Key Features
Feature
Implementation
Power supply
3.4V ~4.4V
Power saving
Typical power consumption in sleep mode is 0.65 mA (AT+CFUN=0 )
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 protocol 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
External antenna
Antenna pad
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
Frequency bands
Serial port and
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Serial port:
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USB 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:
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
Firmware upgrade
Full modern serial port or USB interface (recommend to use USB port)
Size:17.6*15.7*2.3mm
Weight:1.5g
Table 3: GNSS engine Performance
Performance
Parameter
Description
Horizontal Position
Accuracy(1)
Autonomous
1.5s
t>1s
VIL62ms
VDD_EXT
t>3.2s
STATUS
Serial Port
Undefind
Active
Figure 13: Timing of power on module
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When power on procedure is completed, SIM868 will send following URC to indicate that the module is ready to
operate at fixed baud rate.
RDY
This URC does not appear when autobauding function is active.
Note: Customer can use AT command “AT+IPR=x” to set a fixed baud rate and save the configuration to
non-volatile flash memory. After the configuration is saved as fixed baud rate, the Code “RDY” should be
received from the serial port every time when SIM868 is powered on. For details, please refer to the chapter
“AT+IPR” in document [1].
4.2.2.
Power off SIM868
SIM868 will be powered off in the following situations：
Normal power off procedure: power off SIM868 by the PWRKEY pin.
Normal power off procedure: power off SIM868 by AT command “AT+CPOWD=1”.
4.2.2.1.
Power off SIM868 by the PWRKEY Pin
Customer can power off SIM868 by pulling down the PWRKEY pin for at least 1.5 second and release. Please
refer to the power on circuit. The power off timing is illustrated in the following figure.
PWRKEY
(input)
1.5s
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