Sierra Wireless AirLink FXT Series Guía de usuario Pagina 44
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WA_DEV_FEX20_UGD_002 Rev 004 March 08, 2011 44
Fastrack Xtend User Guide
Interfaces
Table 16. Equivalent Circuits of CMIC2
DC Equivalent Circuit
AC Equivalent Circuit
Table 17. Electrical Characteristics of CMIC2
Parameters
Min
Typ
Max
Unit
Internal biasing
DC Characteristics
MIC2+
2
2.1
2.2
V
Output current
0.5
1.5
mA
R2
1650
1900
2150
AC Characteristics
200 Hz<F<4 kHz
Z2 CMIC2P
(CMIC2N=Open)
1.1
1.3
1.6
k
Z2 CMIC2N
(CMIC2P=Open)
Z2 CMIC2P
(CMIC2N=GND)
0.9
1.1
1.4
Z2 CMIC2N
(CMIC2P=GND)
Impedance between
MIC2P and MIC2N
1.3
1.6
2
Working voltage
( MIC2P-MIC2N)
AT+VGT*=3500dB
13.8
mVrms
AT+VGT*=2000dB
77.5
AT+VGT*=700dB
346
Maximum rating voltage
(MIC2P or MIC2N)
Positive
+7.35**
V
Negative
-0.9
* The input voltage depends of the input micro gain set by AT command. Refer to document [7] Firmware 7.4a
AT Commands Manual (Sierra Wireless Software Suite 2.31)/Firmware 7.4 AT Commands Manual (Sierra Wireless
Software Suite 2.30).
** Because MIC2P is internally biased, it is necessary to use a coupling capacitor to connect an audio signal
provided by an active generator. Only a passive microphone can be directly connected to the MIC2P and MIC2N inputs.
Refer to the following table for the list of recommended microphone characteristics.
Table 18. Recommended Microphone Characteristics
Feature
Values
Type
Electret 2V/0.5 mA
Impedance
Z = 2k
Sensitivity
-40dB to -50dB
SNR
> 50dB
Frequency response
Compatible with GSM specifications
- AirLink FXT Series 1
- Fastrack Xtend User Guide 1
- Important Notice 2
- Safety and Hazards 2
- Limitations of Liability 2
- Patents 3
- Copyright 3
- Trademarks 3
- Contact Information 3
- Document History 4
- Contents 6
- List of Figures 11
- List of Tables 13
- 1. Overview 16
- 1.2. Overall Dimensions 19
- 1.4. Connections 20
- 1.5. Interfaces 20
- 2. Features and Services 22
- Features and Services 23
- 2.2. Supported Bands 26
- 2.4. Protection 27
- 3.2. RF Functionalities 29
- 3.3. Operating System 29
- 4. Technical Specifications 30
- 5. Interfaces 32
- , Vref = 2.8V 34
- , Vref > 2.8V 37
- 5.1.1.2. ON/OFF Pin 38
- 5.1.2. Serial Interface 39
- 5.1.2.2. Autobauding Mode 43
- 5.1.2.4.2. Speaker 45
- 5.1.3. USB Interface 46
- 5.2. Back Interface 47
- 5.2.2. Main RF Interface 48
- FXT010) 49
- 6. Signals and Indicators 53
- 6.4. LED Status Indicator 55
- 6.5. Real Time Clock (RTC) 56
- 7. Expansion Card 57
- Expansion Card 58
- 7.4.1. Ethernet 61
- 7.4.1.2. Board Architecture 62
- 7.4.1.4. Power Supply 63
- 7.4.2. IO+GPS 64
- 7.4.2.4. Power Supply 67
- 7.4.2.7. External Antenna 67
- 7.4.2.8. GPS RF Performance 68
- 7.4.3.2. Board Architecture 69
- 7.4.3.4. Power Supply 71
- 7.5. Expansion Card Removal 72
- 8. Using the Fastrack Xtend 73
- 8.2. Getting Started 74
- 8.4. Operational Status 78
- 9.1. Communications Testing 79
- 9.5. Switching Bands 81
- 9.8. Echo Function 83
- 9.9. DC-IN Detection 83
- Firmware 7.4a 84
- 11.2. Receiving “ERROR” 86
- 12. Power Consumption 88
- 12.2. Working Mode Features 89
- (FXT009) 90
- (FXT003) 92
- 12.8.1.1. Equipment 99
- 12.8.1.2. SIM Cards Used 100
- Power Consumption 101
- Fastrack Xtend on Trucks 103
- 14.1. Standard Accessories 105
- 14.3. Optional Battery 105
- Battery Accessory 107
- 15.3. Charging Time 109
- 15.2. LED Indicator 109
- 15.5. DC-IN Detection 110
- Other Information 111
- Recommended Standards 112
- 16.3.2.1. Life Stress Test 114
- Recovery time: 3 hours 115
- 18. Safety Recommendations 121
- 18.2. Battery Safety 122
- 18.3. Vehicle Safety 122
- 18.4. Care and Maintenance 122
- 18.5. Your Responsibility 123
- 19. Reference Documents 124
- 20. List of Abbreviations 126
- List of Abbreviations 127
- 21. Appendix A: Packaging 128
- 21.2.1. GSM Antenna 130
- 21.2.2. GPS Antenna 131
- 21.2.3. Serial Data Cable 132
- 21.2.5. USB Cable 134
- 21.2.7. Package 135
- 21.2.8. Two Holding Bridles 135
- 23. Appendix C: Safety 139
- 23.2. General Safety 140
- 23.2.6. Children 141
- 23.2.7. Blasting Areas 141
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