Motorola AT Commands G24-L Informações Técnicas descarregar pdf (Página 55)

Chapter 2: Hardware Interface Description

November 15, 2008 G24-L Module Hardware Description 29

Figure 2-17 shows a differential speaker circuit, Figure 2-18 shows a single-ended speaker circuit

and Table 2-8 gives the speaker specifications.

Figure 2-17: Differential Speaker Circuit

Important: For safety regulations it is important to place series resistors on the speaker output

lines, as illustrated in Figure 2-17. The resistors value should be R = 0

Ω at the

design stage, but may be changed to a different value during audio safety testing, in

case speaker level limitation is required.

Figure 2-18: Single-ended Speaker Circuit

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 105 106

Technical Information 1
Copyrights 2
Computer Software Copyrights 2
Trademarks 3
Table of Contents 5
Table of Contents 6
List of Figures 9
List of Tables 11
Manual Scope 13
Target Audience 13
Manual Organization 13
Applicable Documents 14
Regulatory Requirements 14
User Operation 15
Antenna Installation 15
Standards 16
Contact Us 16
Text Conventions 17
General Safety 18
Batteries 19
Dangerous procedure warnings 19
Caring for the Environment 20
Limitation of Liability 21
Warranty Notification 22
How to Get Warranty Service? 22
Claiming 23
Conditions 23
Installed Data 24
Out of Warranty Repairs 24
Revision History 25
Chapter 1: Introduction 27
Product Specifications 28
Regulatory Approvals 31
Architecture Overview 33
Digital Block 34
Analog Block 34
GSM Transceiver Block 34
Operating Modes 35
Power Supply 36
Power Consumption 37
GPRS-RMS 38
Power On/Off Operation 39
Turning the G24-L Off 41
Power Loss shut down 42
Low Power Mode 43
Terminating Low Power Mode 44
Using the WKUPI_N signal 45
Incoming Network Data 45
Data on the Serial interface 46
Real Time Clock 47
Serial Interfaces 48
SIM Interface 49
SIM Connection 50
SIM Design Guidelines 50
Audio Interface 52
Headset Microphone Port 53
Speaker Port 54
Ω at the 55
Headset Detection 56
Alert Loudspeaker Port 57
Digital Audio Interface 58
Audio Programming Interface 60
Audio Algorithms 61
Gain Control 62
Audio Design 63
Analog Ground 64
A/D Interface 65
Power Supply A/D 66
Battery Temperature A/D 66
VREF Reference Regulator 68
Wakeup Out 69
Antenna Detection 71
GPRS Detection 71
Transmission Indicator 71
General Purpose I/O 71
Antenna Interface 72
Battery Charger Interface 73
Pin # Signal Name Description 74
Battery Charging Process 75
Monitoring (Full) 76
Protection and Safety 77
Absolute Maximum Ratings 79
Environmental Specifications 80
USB_VBUS 82
SIM_PD_N 82
SIM_RST_ 82
IN-ACTIVE 85
Board Dimensions 87
Mating Connector 89
RF Connector Specifications 90
G24-L Mounting 92
Who to Contact? 93
Required Query Information 93
Motorola Workflow 94
Service Centers 95
Testing a Standalone Unit 96
Figure 5-1: Test Setup 97
Test Procedure 98
Acronyms and Abbreviations 99
Index U - U 104
6802984C05-D 106

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