User's Manual

AC65/AC75 Hardware Interface Description
Confidential / Preliminary
s
AC65/AC75_hd_v00.372 Page 4 of 118 2006-08-03
3.8 RTC Backup ........................................................................................................52
3.9 SIM Interface .......................................................................................................53
3.9.1 Installation Advice..................................................................................54
3.10 Serial Interface ASC0 ..........................................................................................55
3.11 Serial Interface ASC1 ..........................................................................................57
3.12 USB Interface ......................................................................................................58
3.13 I
2
C Interface .........................................................................................................59
3.14 SPI Interface ........................................................................................................61
3.15 Audio Interfaces...................................................................................................63
3.15.1 Speech Processing................................................................................64
3.15.2 Microphone Circuit.................................................................................64
3.15.2.1 Single-ended Microphone Input.............................................................65
3.15.2.2 Differential Microphone Input.................................................................66
3.15.2.3 Line Input Configuration with OpAmp ....................................................67
3.15.3 Loudspeaker Circuit...............................................................................68
3.15.4 Digital Audio Interface (DAI) ..................................................................69
3.15.4.1 Master Mode..........................................................................................70
3.15.4.2 Slave Mode............................................................................................72
3.16 GPIO Interface.....................................................................................................74
3.16.1 Using the GPIO10 Pin as Pulse Counter ...............................................74
3.17 Control Signals ....................................................................................................75
3.17.1 Synchronization Signal ..........................................................................75
3.17.2 Using the SYNC Pin to Control a Status LED........................................76
3.17.3 Behavior of the RING0 Line (ASC0 Interface only)................................77
3.17.4 PWR_IND Signal ...................................................................................77
4 Antenna Interface........................................................................................................78
4.1 Antenna Diagnostic..............................................................................................79
4.2 Antenna Connector..............................................................................................80
5 Electrical, Reliability and Radio Characteristics......................................................82
5.1 Absolute Maximum Ratings .................................................................................82
5.2 Operating Temperatures......................................................................................83
5.3 Storage Conditions ..............................................................................................84
5.4 Reliability Characteristics.....................................................................................85
5.5 Pin Assignment and Signal Description...............................................................86
5.6 Power Supply Ratings .........................................................................................93
5.7 Electrical Characteristics of the Voiceband Part..................................................96
5.7.1 Setting Audio Parameters by AT Commands ........................................96
5.7.2 Audio Programming Model ....................................................................97
5.7.3 Characteristics of Audio Modes .............................................................98
5.7.4 Voiceband Receive Path........................................................................99
5.7.5 Voiceband Transmit Path.....................................................................100
5.8 Air Interface .......................................................................................................101
5.9 Electrostatic Discharge ......................................................................................102
6 Mechanics..................................................................................................................103
6.1 Mechanical Dimensions of AC65/AC75.............................................................103
6.2 Mounting AC65/AC75 to the Application Platform .............................................105
6.3 Board-to-Board Application Connector ..............................................................106
7 Sample Application...................................................................................................109
8 Reference Approval ..................................................................................................111
8.1 Reference Equipment for Type Approval...........................................................111
8.2 Compliance with FCC Rules and Regulations...................................................112