CMX605 CML Microcircuits Digital Line to POTS Interface COMMUNICATION SEMICONDUCTORS D/605/8 February 2012 Provisional Issue Features Applications Pre-Programmed Tone Generators Digital Line to POTS Interface Fully Integrated DTMF Decoder/Encoder Subscriber Terminal Adapters SPM Generator Wireless Local Loop Simple Serial Control Interface Computer Telephony Integration 3.58MHz Xtal/Clock Telephone/Radio Patch Systems V23/Bell 202 FSK Generator Pair Gain Systems Digital Ringing Voltage Generator Billing/SPM Systems 1.1 Brief Description The CMX605 is an integrated telecom tone generator and DTMF encoder/decoder designed for ISDN interfaces, Wireless Local Loop and Analogue to Digital Phone Conversion systems. The tone generator covers an extensive range of pre-programmed tones used in analogue phone systems (POTS). Three outputs are provided: Ringing signals, In-band tones or FSK data, and 12kHz/16kHz Metering pulses. Simple software control facilitates the interface to a wide range of commonly used Cs and SLICs, enabling a comprehensive analogue telephone line presentation. The DTMF encoder/decoder presents the digital line interface with DTMF dialling information received from the telephone user and generates the appropriate DTMF tones for the POTS interface. DTMF tone pairs can be encoded along with each tone singly or with other dual tone signals, such as those used in CIDCW systems and On Hook signalling systems. Other tone standards supported are: Fax and Modem answer and originate, ITU (CCITT) R1 and R2 signals, and sufficient tones for simple melody generation. Communication to and from the host Controller is performed by a C-BUS serial interface, which is compatible with the SPI interface. 2012 CML Microsystems Plc Digital Line to POTS Interface CMX605 CONTENTS Section Page 1.1 Brief Description ..................................................................................... 1 1.2 Block Diagram ......................................................................................... 3 1.3 Signal List ................................................................................................ 4 1.4 External Components ............................................................................. 6 1.5 General Description ................................................................................ 7 1.5.1 Xtal Osc and Clock Dividers......................................................... 7 1.5.2 Uncommitted Amplifier ................................................................. 7 1.5.3 Tone/FSK Encoder and Tone Encoder ........................................ 7 1.5.4 SPM Generator .......................................................................... 10 1.5.5 Transmit Signal Control .............................................................. 10 1.5.6 Tx UART .................................................................................... 10 1.5.7 DTMF Tone Decoder ................................................................. 12 1.5.8 C-BUS Interface ....................................................................... 13 1.5.9 C-BUS Registers ...................................................................... 14 1.6 Application Notes .................................................................................. 15 1.6.1 Telecom Tones .......................................................................... 15 1.6.2 C-BUS Timing ............................................................................ 19 1.7 Performance Specification ................................................................... 22 1.7.1 Electrical Performance ............................................................... 22 1.7.2 Packaging .................................................................................. 26 2012 CML Microsystems Plc 2 D/605/8