
AC75 Hardware Interface Description
Strictly confidential / Preliminary
s
AC75_HD_V00.202 Page 4 of 120 27.04.2006
3.7 Summary of State Transitions (Except SLEEP Mode).........................................49
3.8 RTC Backup ........................................................................................................50
3.9 SIM Interface .......................................................................................................51
3.9.1 Installation Advice..................................................................................52
3.10 Serial Interface ASC0 ..........................................................................................53
3.11 Serial Interface ASC1 ..........................................................................................55
3.12 USB Interface ......................................................................................................56
3.12.1 Installing the USB Modem Driver...........................................................57
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 AC75.......................................................................103
6.2 Mounting AC75 to the Application Platform .......................................................105
6.3 Board-to-Board Application Connector ..............................................................106
7 Sample Application...................................................................................................109
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