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sim900b硬件参考设计资料

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标签： SIM900

SIM900B的硬件设计参考资料。详细。

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SIM900BHardware DesignV200 Smart Machine Smart Decision Document Title SIM900B Hardware Design Version Date Status 200 20110411 Release Document Control ID SIM900BHardware DesignV200 General Notes SIMCom offers this information as a service to its customers to support application and engineering efforts that use the products designed by ......

SIM900B_Hardware Design_V2.00

Smart Machine Smart Decision

Document Title

Version

Date

Status

Document Control ID

SIM900B Hardware Design

2.00

2011-04-11

Release

SIM900B_Hardware Design_V2.00

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.

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

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.

SIM900B_Hardware Design_V2.00

2011-04-11

Smart Machine Smart Decision

Contents

Contents.................................................................................................................................................................... 3

Version History ........................................................................................................................................................ 7

Introduction....................................................................................................................................................... 8

SIM900B Overview........................................................................................................................................... 8

2.1

SIM900B Key Features ............................................................................................................................ 8

2.2

Operating Modes .................................................................................................................................... 10

2.3

SIM900B Functional Diagram ................................................................................................................11

Application Interface...................................................................................................................................... 12

3.1

Pin Description ....................................................................................................................................... 12

3.2

Power Supply.......................................................................................................................................... 14

3.2.1 Minimizing Voltage Drop of VBAT ................................................................................................... 15

3.2.2 Monitoring Power Supply ................................................................................................................... 15

3.3

Power on/down Scenarios ...................................................................................................................... 15

3.3.1 Power on SIM900B............................................................................................................................. 15

3.3.1.1

Turn on SIM900B Using the PWRKEY Pin (Power on) ..................................................................... 15

3.3.2 Power down SIM900B........................................................................................................................ 16

3.3.2.1

Power down SIM900B by the PWRKEY Pin ...................................................................................... 17

3.3.2.2

Power down SIM900B by AT Command ............................................................................................ 17

3.3.2.3

Over-voltage or Under-voltage Power down ....................................................................................... 17

3.3.2.4

Over-temperature or Under-temperature Power down ......................................................................... 18

3.3.3

3.4

3.4.1

3.4.2

3.4.3

3.4.4

3.4.5

3.5

3.6

3.6.1

3.6.2

3.7

3.7.1

3.7.2

3.7.3

3.7.4

3.8

3.8.1

3.8.2

3.9

3.10

3.11

Restart SIM900B by PWRKEY Pin.................................................................................................... 18

Power Saving Mode................................................................................................................................ 19

Minimum Functionality Mode ............................................................................................................ 19

Sleep Mode 1 (AT+CSCLK=1) .......................................................................................................... 19

Wake Up SIM900B from Sleep Mode 1 (AT+CSCLK=1)................................................................. 19

Sleep Mode 2 (AT+CSCLK=2) .......................................................................................................... 20

Wake Up SIM900B from Sleep Mode 2 (AT+CSCLK=2)................................................................. 20

RTC Backup ........................................................................................................................................... 20

Serial Interfaces ...................................................................................................................................... 21

Function of Serial Port and Debug Port .............................................................................................. 22

Software Upgrade and Debug ............................................................................................................. 23

Audio Interfaces ..................................................................................................................................... 23

Speaker Interface Configuration ......................................................................................................... 24

Microphone Interfaces Configuration ................................................................................................. 25

Earphone Interface Configuration....................................................................................................... 25

Audio Electronic Characteristics......................................................................................................... 25

SIM Card Interface ................................................................................................................................. 26

SIM Card Application ......................................................................................................................... 26

Design Considerations for SIM Card Holder ...................................................................................... 27

LCD Display/SPI Interface..................................................................................................................... 29

ADC........................................................................................................................................................ 30

RI Behaviors........................................................................................................................................... 30

2011-04-11

SIM900B_Hardware Design_V2.00

Smart Machine Smart Decision

3.12

3.13

3.14

3.15

Network Status Indication ...................................................................................................................... 31

General Purpose Input/Output (GPIO) ................................................................................................... 32

Keypad Interface .................................................................................................................................... 32

Buzzer..................................................................................................................................................... 33

Electrical, Reliability and Radio Characteristics......................................................................................... 34

4.1

Absolute Maximum Ratings................................................................................................................... 34

4.2

Recommended Operating Conditions..................................................................................................... 34

4.3

Digital Interface Characteristics ............................................................................................................. 34

4.4

SIM Card Interface Characteristics ........................................................................................................ 34

4.5

SIM_VDD Characteristics...................................................................................................................... 35

4.6

VRTC Characteristics ............................................................................................................................. 35

4.7

Current Consumption (VBAT = 3.8V) ................................................................................................... 35

4.8

Electro-Static Discharge ......................................................................................................................... 36

4.9

Radio Characteristics.............................................................................................................................. 37

4.9.1 Module RF Output Power ................................................................................................................... 37

4.9.2 Module RF Receive Sensitivity........................................................................................................... 38

4.9.3 Module Operating Frequencies ........................................................................................................... 39

Manufacturing ................................................................................................................................................ 40

5.1

Mechanical Dimensions of SIM900B .................................................................................................... 40

5.2

Mounting SIM900B onto the application platform ................................................................................ 41

5.3

Board-to-board connector....................................................................................................................... 41

5.4

Mechanical dimensions of the RUNFENG BB530-06001-20R............................................................. 42

5.5

RF connector .......................................................................................................................................... 43

5.6

Top View of the SIM900B...................................................................................................................... 44

PIN Assignment of SIM900B................................................................................................................. 45

5.7

Appendix ................................................................................................................................................................ 46

A. Related Documents.......................................................................................................................................... 46

B. Terms and Abbreviations ................................................................................................................................. 47

C. Safety Caution ................................................................................................................................................. 48

SIM900B_Hardware Design_V2.00

2011-04-11

Smart Machine Smart Decision

Table Index

TABLE 1: SIM900B KEY FEATURES ............................................................................................................................. 8

TABLE 2: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ............................ 10

TABLE 3: OVERVIEW OF OPERATING MODES........................................................................................................ 10

TABLE 4: PIN DESCRIPTION ....................................................................................................................................... 12

TABLE 5:THE CURRENT CONSUMPTION OF MINIMUM FUNCTIONALITY MODE ......................................... 19

TABLE 6: MICROPHONE INPUT CHARACTERISTICS ............................................................................................ 26

TABLE 7: AUDIO OUTPUT CHARACTERISTICS ...................................................................................................... 26

TABLE 8: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER)......................................................................... 28

TABLE 9: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) ................................................................................ 29

TABLE 10: ADC SPECIFICATION ................................................................................................................................ 30

TABLE 11: RI BEHAVIORS ........................................................................................................................................... 30

TABLE 12: STATUS OF THE NETLIGHT PIN.............................................................................................................. 31

TABLE 13: PIN DEFINITION OF THE KEYPAD INTERFACE................................................................................... 32

TABLE 14: ABSOLUTE MAXIMUM RATINGS........................................................................................................... 34

TABLE 15: RECOMMENDED OPERATING CONDITIONS ....................................................................................... 34

TABLE 16: DIGITAL INTERFACE CHARACTERISTICS ........................................................................................... 34

TABLE 17: SIM CARD INTERFACE CHARACTERISTICS........................................................................................ 35

TABLE 18: SIM_VDD CHARACTERISTICS................................................................................................................ 35

TABLE 19: VRTC CHARACTERISTICS ....................................................................................................................... 35

TABLE 20: CURRENT CONSUMPTION ...................................................................................................................... 35

TABLE 21: THE ESD CHARACTERISTICS (TEMPERATURE: 25℃, HUMIDITY: 45 %) ....................................... 36

TABLE 22: SIM900B GSM 900 AND GSM 850 CONDUCTED RF OUTPUT POWER.............................................. 37

TABLE 23: SIM900B DCS 1800 AND PCS 1900 CONDUCTED RF OUTPUT POWER ............................................ 38

TABLE 24: SIM900B CONDUCTED RF RECEIVE SENSITIVITY............................................................................. 39

TABLE 25: SIM900B OPERATING FREQUENCIES.................................................................................................... 39

TABLE 26: PIN ASSIGNMENT...................................................................................................................................... 45

TABLE 27: RELATED DOCUMENTS ........................................................................................................................... 46

TABLE 28: TERMS AND ABBREVIATIONS................................................................................................................ 47

TABLE 29: SAFETY CAUTION..................................................................................................................................... 48

SIM900B_Hardware Design_V2.00

2011-04-11

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