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Motorola 8900 User Manual - Page 67

Antenna Detection, CDMA Network Indicator, Transmission Indicator, General Purpose I/O

UPC - 845374028836

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Chapter 2: Hardware Interface Description Antenna Detection The C24 incorporates an internal antenna detection circuit, which senses the physical connection and removal of an antenna or antenna circuit on the C24 antenna connector. The antenna detection state is reported to the application through the ANT_DET output signal, and may also be queried by the ATS97 command. The detection circuit senses DC resistance to ground on the C24 antenna connector. A DC resistance below 100kohm (+10%) is defined as a valid antenna connection, and the ANT_DET output signal is set high. CDMA Network Indicator The CDMA output signal indicates the network CDMA connection status. When C24 is connected to a CDMA network, this signal is enabled. When C24 is not connected to the CDMA network this signal is disabled. Transmission Indicator The TXEN_N output signal indicates when C24 is transmitting over the CDMA network. This signal is set low during transmission, and set high when no transmission is in progress. General Purpose I/O The C24 incorporates 8 general purpose IO signals for the user application. Each GPIO signal may be configured and controlled by AT command. These signals may be used to control or set external application circuits, or to receive indications from the external application. December 15, 2008 C24 Module Hardware Description 43

Section	Page
Table of Contents	5
List of Figures	9
List of Tables	10
Preface	11
Manual Scope	11
Target Audience	11
Manual Organization	11
Applicable Documents	12
Regulatory Requirements	12
Safety Statement and Requirements	12
Antenna and Transmission Safety Precautions	13
Standards	13
Contact Us	14
Text Conventions	14
Field Service	16
General Safety	16
Caring for the Environment	17
Limitation of Liability	19
Warranty Notification	20
How to Get Warranty Service?	20
Claiming	21
Conditions	21
What is Not Covered by the Warranty	22
Installed Data	22
Out of Warranty Repairs	22
Revision History	23
Chapter 1: Introduction	25
Product Specifications	26
Certifications Approvals	28
Regulatory Approvals	29
CFR 47 Part 15.19 specifies label requirements	29
CFR 47 Part 15.21 Information to user	29
CFR 47 Part 15.105 Information to the user	29
Chapter 2: Hardware Interface Description	31
Architecture Overview	31
Digital Block	32
Analog Block	32
CDMA Transceiver Block	32
Operating Modes	33
Power Supply	34
Power Supply Design	34
Power Consumption	35
Power On/Off Operation	36
Turning the C24 On	36
Turning the C24 On Using ON_N	36
Turning the C24 On Using IGN	37
Turning the C24 Off	37
Turning the C24 Off Using ON_N	37
Turning the C24 Off Using IGN	38
Turning the C24 Off Using AT+MRST	39
Power Loss shut down	39
Low Power Mode	40
Activating Low Power Mode	40
Serial Interface During Low Power Mode	41
Terminating Low Power Mode	41
Temporary Termination of Low Power Mode	42
Permanent termination of Low Power Mode	43
Real Time Clock	44
Serial Interfaces	45
Primary UART (UART1)	45
Secondary UART (UART2)	45
USB Interface	46
UIM Interface	47
UIM Connection	47
UIM Design Guidelines	48
Audio Interface	49
Handset Microphone Port	49
Headset Microphone Port	50
Speaker Port	51
Headset Detection	53
Alert Loudspeaker Port	54
Digital Audio Interface	55
Operating Modes	56
Basic Mode	56
Advanced Mode	56
Audio Programming Interface	57
Audio Algorithms	58
Gain Control	59
Audio Design	60
Analog Ground	61
A/D Interface	62
General Purpose A/D	62
Power Supply A/D	62
Controls and Indicators Interface	64
Reset	64
VREF Reference Regulator	64
Wakeup Out	65
Antenna Detection	67
CDMA Network Indicator	67
Transmission Indicator	67
General Purpose I/O	67
GPS Interface	68
Antenna Interface	69
Chapter 3: Electrical and Environmental Specifications	71
Absolute Maximum Ratings	71
Environmental Specifications	72
Application Interface Specifications	72
Chapter 4: Mechanical Specifications	79
Board Dimensions	79
Interface Connector Specifications	80
Mating Connector	81
RF Connector Specifications	82
Mating Connector	82
C24 Mounting	84
Chapter 5: Service and Testing	85
Service	85
Who to Contact?	85
Required Query Information	85
Motorola Workflow	86
Service Centers	87
Testing a Standalone Unit	88
Test Setup	88
Test Procedure	90
Acronyms and Abbreviations	91
A	91
B	91
C	91
D	91
E	91
F	92
G	92
H	92
I	92
L	92
M	92
O	92
P	92
R	93
S	93
T	93
U	94
V	94
Index	95
A	95
B	95
C	95
E	95
O	95
P	95
R	95
S	95
T	95

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Chapter 2: Hardware Interface Description

December 15, 2008

C24 Module Hardware Description

Antenna Detection

The C24 incorporates an internal antenna detection circuit, which senses the physical connection

and removal of an antenna or antenna circuit on the C24 antenna connector. The antenna

detection state is reported to the application through the ANT_DET output signal, and may also

be queried by the ATS97 command.

The detection circuit senses DC resistance to ground on the C24 antenna connector.

A DC resistance below 100kohm (+

10%) is defined as a valid antenna connection, and the

ANT_DET output signal is set high.

CDMA Network Indicator

The CDMA output signal indicates the network CDMA connection status. When C24 is

connected to a CDMA network, this signal is enabled. When C24 is not connected to the CDMA

network this signal is disabled.

Transmission Indicator

The TXEN_N output signal indicates when C24 is transmitting over the CDMA network. This

signal is set low during transmission, and set high when no transmission is in progress.

General Purpose I/O

The C24 incorporates 8 general purpose IO signals for the user application. Each GPIO signal

may be configured and controlled by AT command. These signals may be used to control or set

external application circuits, or to receive indications from the external application.