V.22 bis Modem with AT Commands
CMX866
CONTENTS
Section
1.1
1.2
1.3
1.4
Page
Brief Description..................................................................................1
Block Diagram .....................................................................................3
Signal List ............................................................................................4
External Components..........................................................................6
1.4.1 Ring Detector Interface ...........................................................8
1.4.2 Line Interface...........................................................................9
1.4.3 Serial Interface ...................................................................... 11
1.4.4 RESETN pin........................................................................... 12
General Description........................................................................... 13
1.5.1 Internal Structure .................................................................. 13
1.5.2 Operating States and Data Flow........................................... 14
1.5.3 Functional Description ......................................................... 16
1.5.4 AT Command and Register Set ............................................ 17
1.5.4.1 AT Command and S-Register Summary.................. 17
1.5.4.2 General Description of AT Commands.................... 19
1.5.4.3 AT Commands in Detail............................................ 20
1.5.4.4 Extended AT Commands ......................................... 23
1.5.4.5 S-Registers................................................................ 25
1.5.4.6 Result Codes............................................................. 29
1.5.5 Tx USART .............................................................................. 30
1.5.6 FSK and QAM/DPSK Modulators ......................................... 31
1.5.7 Tx Filter and Equaliser.......................................................... 32
1.5.8 DTMF/Tone Generator .......................................................... 32
1.5.9 Tx Level Control and Output Buffer..................................... 32
1.5.10 Rx DTMF/Tones Detectors.................................................... 33
1.5.11 Rx Modem Filterering and Demodulation............................ 34
1.5.12 Rx Modem Pattern Detectors and Descrambler .................. 35
1.5.13 Rx Data Register and USART ............................................... 35
Application Notes .............................................................................. 37
1.6.1 Hardware Interface ................................................................ 37
1.6.2 Calling Modem AT Commands............................................. 42
1.6.3 Answering Modem AT Commands....................................... 42
1.6.4 RS232 Transaction Sequence .............................................. 43
Performance Specification................................................................ 44
1.7.1 Electrical Performance.......................................................... 44
1.7.1.1 Absolute Maximum Ratings ..................................... 44
1.7.1.2 Operating Limits ....................................................... 44
1.7.1.3 Operating Characteristics ........................................ 45
1.7.2 Packaging.............................................................................. 51
1.5
1.6
1.7
©
2004 CML Microsystems Plc
2
D/866/4
CMLMICRO [ CML MICROCIRCUITS ]
