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communication semiconductors CMX605 data bulletin digital line to pots interface 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. preliminary information features applications pre-programmed tone generators fully integrated dtmf decoder/encoder spm generator simple serial control interface 3.58mhz xtal/clock v.23/bell 202 fsk generator digital ringing voltage generator digital line to pots interface subscriber terminal adapters wireless local loop computer telephony integration telephone/radio patch systems pair gain systems billing/spm systems codec dc-to-dc c caller id ring dial slic analog telephone port digital line circuit CMX605 the CMX605 is an integrated telecom tone generator and dtmf encoder/decoder designed for isdn interfaces, wireless local loop and analog to digital telephone conversion systems. the tone generator covers an extensive range of pre-programmed tones used in analog telephone 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 analog telephone line presentation. the dtmf encoder/decoder presents the digital line interface with dtmf dialing 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? signaling 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 c is performed by a ?c-bus? interface which is compatible with common serial interfaces such as: sci, spi, and microwire. the CMX605 operates using a 2.7v to 5.5v supply and is available in the following packages: 16-pin soic (CMX605d4) and 16-pin pdip (CMX605p3).
digital line to pots interface page 2 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. contents section page 1 block diagram ............................................................................................................... 3 2 signal list .................................................................................................................... .. 4 3 external components ................................................................................................... 5 4 general description ...................................................................................................... 5 4.1 xtal osc and clock dividers .............................................................................................. 5 4.2 uncommitted amplifier....................................................................................................... 5 4.3 tone/fsk encoder and tone encoder .............................................................................. 6 4.4 spm generator.................................................................................................................. 8 4.5 tx signal control .............................................................................................................. .8 4.6 tx uart........................................................................................................................ .. 10 4.6.1 tx uart timings ................................................................................................................ .10 4.7 dtmf tone decoder ....................................................................................................... 11 4.8 ?c-bus? interface ............................................................................................................. 1 2 4.9 ?c-bus? registers............................................................................................................ 13 4.10 c-bus timings ................................................................................................................ 14 5 application................................................................................................................... 1 7 5.1 telecom tones ................................................................................................................ 17 6 performance specification......................................................................................... 21 6.1 electrical performance..................................................................................................... 21 6.1.1 absolute maximum ratings .................................................................................................. 21 6.1.2 operating limits............................................................................................................... ..... 21 6.1.3 operating characteristics ..................................................................................................... 2 2 6.1.4 timing ......................................................................................................................... .......... 25 6.2 packaging...................................................................................................................... .. 26 mx-com, inc reserves the right to change specifications at any time and without notice.
digital line to pots interface page 3 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 1 block diagram v dd v bias v bias v ss rxin in- tx uart status and irq status and irq dtmf tone decoder bus 3.58mhz oscillator psu spm generator xtal xtal/clock serial clock command data reply data cs irq c-bus computer serial port fsk/tones tx registers setup and mode registers status register interrupt generator rom tone encoder tone/fsk encoder tx signal control spm ring tonefsk ampout figure 1: block diagram
digital line to pots interface page 4 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 2 signal list CMX605 d4/p3 signal description pin no. name type 1 xtal output the output of the on-chip xtal oscillator inverter. 2 xtal/clock input the input to the oscillator inverter from the xtal circuit or external clock source. 3 serial clock input the ?c-bus? serial clock input from the host m c. see section 4.8 4 command data input the ?c-bus? serial data input from the host m c. 5 reply data tri-state a 3-state ?c-bus? serial data output to the host m c. this output is high impedance when not sending data to the host m c. 6 cs input chip select. the ?c-bus? transfer control input provided by the host m c. 7 irq output a ?wire-orable? output for connection to a host m c interrupt request input. this output is pulled down to v ss when active and is high impedance when inactive. an external pull-up resistor is required. 8 v ss power the negative supply rail (ground). 9 tonefsk output the sinewave output of the tones and fsk signal generators. 10 spm the sinewave output of the spm signal generator. 11 v bias output an internally generated bias voltage of v dd /2, except when the device has been reset, v bias will discharge to v ss . it should be bypassed to v ss by a capacitor mounted close to the device pins. 12 rxin input the input to the dtmf decoder, internally biased at v dd /2. it should be ac coupled. 13 in- input the inverting input to the uncommitted amplifier. 14 ampout output the output of the uncommitted amplifier. 15 ring output the squarewave output of the ringing signal generator. 16 v dd power the positive supply rail. levels and thresholds within the device are proportional to this voltage. it should be bypassed to v ss by a capacitor mounted close to the device pins. this device is capable of detecting and decoding small amplitude signals. to achieve this, v dd and v bias decoupling and protection of the receive path from extraneous in-band signals are very important. it is recommended that the printed circuit board is laid out with a ground plane in the CMX605 area to provide a low impedance connection between the v ss pin and the v dd and v bias bypass capacitors. table 1: signal list
digital line to pots interface page 5 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 3 external components 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 xtal/clock xtal irq serial clock reply data command data cs ring ampout in- spm v bias rxin tonefsk x1 r1 c1 c2 c5 c3 c4 v ss v dd v dd v dd CMX605 figure 2: recommended external components r1 100k c1, c2 18pf c3 0.1f x1 3.579545 mhz c4, c5 1.0f table 2: recommended external components recommended external component notes: 1. resistors 5%, capacitors 10% unless otherwise stated. 2. for best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of v dd , peak to peak. tuning fork crystals generally cannot meet this requirement. to obtain crystal oscillator design assistance, please consult your crystal manufacturer. 4 general description the CMX605 is a telecom tone generator and dtmf tone encoder/decoder. it has separate output ports for the three different classes of signals encoded. these include ringing signal, in-band tones or fsk data at 1200bps and high frequency metering pulses (spm tones). it has a transmit level attenuator for in-band tones or fsk data and an envelope control for spm tones. it also has an uncommitted amplifier and uses the industry standard 3.58mhz xtal for its oscillator. these functions are controlled over a ?c-bus? serial c interface, which also carries the transmit fsk data and the dtmf decoded data. the CMX605 should initially be reset by issuing a ?c-bus? reset command. individual functions may be disabled or enabled by the use of bits 5, 6 and 7 in the setup register. see section 4.9. approximately 50ms should be allowed for the tx dc level to settle at v bias before enabling the tx functions (set bit 6 of the mode register to ?1?) after the CMX605 has been reset. 4.1 xtal osc and clock dividers frequency and timing accuracy of the CMX605 is determined by a 3.579545mhz clock present at the xtal/clock pin. this may be generated by the on-chip oscillator inverter using the external components c1, c2 and x1 of figure 2, or may be supplied from an external source to the xtal/clock input. if the clock is supplied from an external source, c1, c2 and x1 should not be fitted. if the clock is provided by an external source which is not always running, then the CMX605 should be reset when the clock is not available. resetting the CMX605 will also turn off the on-chip oscillator. failure to reset the device may cause a rise in the supply current drawn by the CMX605. 4.2 uncommitted amplifier this amplifier, with suitable external components, can be used either for adjusting the received signal to the correct amplitude for the dtmf decoder or for adjusting the transmit signal level (for the line hybrid).
digital line to pots interface page 6 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4.3 tone/fsk encoder and tone encoder when bit 5 of the mode register is set to ?1? then these blocks generate fsk signals as determined by bit 0 of the setup register and the tx data bits from the uart block, as shown in table 3. setup register bit 0 tone/fsk generator fsk signal frequency ?0? (space) fsk signal frequency ?1? (mark) 0 v23 1200bps fsk 2100hz 1300hz 1 bell 202 1200bps fsk 2200hz 1200hz table 3: tone/fsk encoder and tone decoder when bit 5 of the mode register is set to ?0?, these blocks generate single or dual tones from the range shown in table 4, table 5, table 6, and table 7. bit 6 of the mode register is then used to enable or disable the block?s output to the tx signal control, ring, and tonefsk outputs. there are four tone fields addressed by bits 0 and 1 of the mode register. tx tones register bits 4-7 tx tones register bits 0-3 d7 d6 d5 d4 frequency (hz) d3 d2 d1 d0 frequency (hz) 0 0 0 0 0 = off 0 0 0 0 0 = off 0 0 0 1 252.4 0 0 0 1 * 17.1 0 0 1 0 268.7 0 0 1 0 * 20.5 0 0 1 1 285.3 0 0 1 1 * 24.9 0 1 0 0 315.5 0 1 0 0 * 34.1 0 1 0 1 330.5 0 1 0 1 * 41.0 0 1 1 0 375.2 0 1 1 0 * 51.2 0 1 1 1 404.3 0 1 1 1 - 1 0 0 0 468.0 1 0 0 0 262.9 1 0 0 1 495.8 1 0 0 1 293.6 1 0 1 0 520.6 1 0 1 0 348.2 1 0 1 1 548.0 1 0 1 1 392.6 1 1 0 0 562.8 1 1 0 0 1600 1 1 0 1 578.4 1 1 0 1 1633 1 1 1 0 595.0 1 1 1 0 1827 1 1 1 1 612.5 1 1 1 1 587.2 table 4: tone field 0, mode register bit 1 and bit 0 = ?0? and ?0? respectively. note: * these outputs are routed to the ring digital output instead of the tonefsk output. any single tone output level at tonefsk output is 0dbm.
digital line to pots interface page 7 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. tx tones register bits 4-7 tx tones register bits 0-3 d7 d6 d5 d4 frequency (hz) d3 d2 d1 d0 frequency (hz) 0 0 0 0 0 = off 0 0 0 0 0 = off 0 0 0 1 120 0 0 0 1 330 0 0 1 0 150 0 0 1 0 416 0 0 1 1 154 0 0 1 1 420 0 1 0 0 250 0 1 0 0 425 0 1 0 1 300 0 1 0 1 433 0 1 1 0 350 0 1 1 0 440 0 1 1 1 360 0 1 1 1 450 1 0 0 0 367 1 0 0 0 460 1 0 0 1 375 1 0 0 1 480 1 0 1 0 380 1 0 1 0 500 1 0 1 1 383 1 0 1 1 600 1 1 0 0 400 1 1 0 0 620 1 1 0 1 450 1 1 0 1 720 1 1 1 0 475 1 1 1 0 930 1 1 1 1 480 1 1 1 1 - table 5: tone field 1, mode register bit 1 and bit 0 = ?0? and ?1? respectively tx tones register bits 4-7 tx tones register bits 0-3 d7 d6 d5 d4 frequency (hz) d3 d2 d1 d0 frequency (hz) 0 0 0 0 0 = off 0 0 0 0 0 = off 0 0 0 1 700 0 0 0 1 700 0 0 1 0 900 0 0 1 0 900 0 0 1 1 1100 0 0 1 1 1100 0 1 0 0 1300 0 1 0 0 1300 0 1 0 1 1500 0 1 0 1 1500 0 1 1 0 1700 0 1 1 0 1700 0 1 1 1 - 0 1 1 1 - 1 0 0 0 950 1 0 0 0 2100 1 0 0 1 1400 1 0 0 1 2225 1 0 1 0 1800 1 0 1 0 - 1 0 1 1 2130 1 0 1 1 2750 1 1 0 0 697 1 1 0 0 1209 1 1 0 1 770 1 1 0 1 1336 1 1 1 0 852 1 1 1 0 1477 1 1 1 1 941 1 1 1 1 1633 table 6: tone field 2, mode register bit 1 and bit 0 = ?1? and ?0? respectively
digital line to pots interface page 8 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. tx tones register bits 4-7 tx tones register bits 0-3 d7 d6 d5 d4 frequency (hz) d3 d2 d1 d0 frequency (hz) 0 0 0 0 0 = off 0 0 0 0 0 = off 0 0 0 1 540 0 0 0 1 540 0 0 1 0 660 0 0 1 0 660 0 0 1 1 780 0 0 1 1 780 0 1 0 0 900 0 1 0 0 900 0 1 0 1 1020 0 1 0 1 1020 0 1 1 0 1140 0 1 1 0 1140 0 1 1 1 - 0 1 1 1 - 1 0 0 0 1380 1 0 0 0 1380 1 0 0 1 1500 1 0 0 1 1500 1 0 1 0 1620 1 0 1 0 1620 1 0 1 1 1740 1 0 1 1 1740 1 1 0 0 1860 1 1 0 0 1860 1 1 0 1 1980 1 1 0 1 1980 1 1 1 0 - 1 1 1 0 - 1 1 1 1 - 1 1 1 1 - table 7: tone field 3, mode register bit 1 and bit 0 = ?1? and ?1? respectively 4.4 spm generator this block operates independently and has its own output pin. it can transmit 12khz or 16khz and is controlled by bit 4 of the setup register. bit 7 of the mode register is used to enable or disable this block. the signal has a rise and fall time each of about 4.5ms. the spm signal rises from the bias level to 0dbm in 16 steps of 2db magnitude, and falls from 0dbm to bias level in 16 steps of 2db magnitude. 4.5 tx signal control this block adjusts the amplitude of the fsk transmit signal output level, the level skew between dtmf tones, and the signal routing to the output ports. output signal levels are proportional to v dd . the nominal output signal levels (at 0db attenuation and v dd = 5.0v) are: single tone 0dbm dual tone (per tone) -3dbm dtmf high frequency tone -3dbm dtmf low frequency tone -5dbm fsk signal 0dbm the ring signal is digital: a square wave with amplitude of ? v dd peak to peak. when the ring signal is not selected, the ring output pin is connected to v ss . the level attenuator provides for level adjustment from 0db to -14db in -2db steps. the typical level is determined by bits 2 to 4 of the mode register as shown in table 8.
digital line to pots interface page 9 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. mode register signal level adjustment bit 4 bit 3 bit 2 (db) 0 0 0 0 0 0 1 -2 0 1 0 -4 0 1 1 -6 1 0 0 -8 1 0 1 -10 1 1 0 -12 1 1 1 -14 table 8: typical level settings as determined by bits 2, 3, and 4 of the mode register
digital line to pots interface page 10 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4.6 tx uart this block connects the c, via the ?c-bus? interface, to the fsk encoder. the block can be programmed to convert transmit data from 8-bit bytes to asynchronous data characters by adding start and stop bits. the transmit data is then passed to the fsk encoder. data to be transmitted should be loaded by the c into the tx data register when the tx data ready bit (bit 6) of the status register goes high. the data will then be treated by the tx uart block in one of two ways, depending on the setting of bit 1 of the setup register: if bit 1 of the setup register is ?0? (tx sync mode) then the 8 bits from the tx data register will be transmitted sequentially at 1200bps, lsb (d0) first. if bit 1 of the setup register is ?1? (tx async mode) then bits will be transmitted as asynchronous data characters at 1200bps according to the following format: one start bit (space) eight data bits (d0-d7) from the tx data register, with the lsb (d0) transmitted first one stop bit (mark) failure to load the tx data register with a new value when required will result in bit 7 (tx data underflow) of the status register being set to ?1?. if the ?tx async? mode of operation is selected then a continuous mark (?1?) signal will be transmitted until a new value is loaded into tx data. if the ?tx sync? mode is selected then the byte already in the tx data register will be re-transmitted. tx data register loaded: digital tx signal: analog fsk signal: t dly t drdy t fsk t ufl tx data ready flag bit: tx data underflow flag bit: d0 d0 start start stop d1 d2 d3 d4 d5 d6 d7 d0 start stop d1 d2 d3 d4 d5 d6 d7 figure 3: transmit uart function (async) tx data register loaded: digital tx signal: analog fsk signal: t dly t drdy t fsk t ufl tx data ready flag bit: tx data underflow flag bit: d0 d0 d0 d1 d1 d2 d2 d3 d3 d4 d4 d5 d5 d6 d6 d7 d7 figure 4: transmit uart function (sync) 4.6.1 tx uart timings typical uart timings (see figure 3 and figure 4) notes min. typ. max. unit t fsk (delay through the modulator) 106 s t dly (1 bit-period) 833 s t drdy (1/4 bit-period) 208 s t ufl (3/4 bit-period) 625 s
digital line to pots interface page 11 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4.7 dtmf tone decoder this block is enabled or disabled by bit 5 of the setup register. if disabled, bit 0 to bit 5 of the status register are set to ?0? and no interrupts are generated. when enabled (set to ?1?), a status change of the decoder will generate an interrupt and bit 5 of the status register will be set to ?1?. the validity of the data is indicated by bit 4 of the status register. the decode truth table is shown in table 9. status register bits 0 - 3 dtmf tone pairs bit 3 (d3) bit 2 (d2) bit 1 (d1) bit 0 (d0) lower frequency (hz) upper frequency (hz) keypad legend 0 0 0 0 941 1633 d 0 0 0 1 697 1209 1 0 0 1 0 697 1336 2 0 0 1 1 697 1477 3 0 1 0 0 770 1209 4 0 1 0 1 770 1336 5 0 1 1 0 770 1477 6 0 1 1 1 852 1209 7 1 0 0 0 852 1336 8 1 0 0 1 852 1477 9 1 0 1 0 941 1336 0 1 0 1 1 941 1209 * 1 1 0 0 941 1477 # 1 1 0 1 697 1633 a 1 1 1 0 770 1633 b 1 1 1 1 852 1633 c table 9: dtmf decode truth table a status change of the decoder and the generation of an interrupt will occur both when a tone is first decoded and also when a tone, which was previously present, is no longer decoded. in the latter case, bit 4 of the status register will be set to ?0? to indicate that no tone was detected.
digital line to pots interface page 12 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4.8 ?c-bus? interface this block provides for the transfer of data and control or status information between the CMX605?s internal registers and the c over the ?c-bus? serial bus. each 'c-bus' transaction consists of a single register address byte sent from the c, as illustrated in figure 5, which may then be followed by either of: a single data byte sent from the c to be written into one of the CMX605?s write only registers, as illustrated in figure 6. a single byte of data read out from one of the CMX605?s read only registers, as illustrated in figure 7. data sent from the c on the command data (command data) line is clocked into the CMX605 on the rising edge of the serial clock (serial clock) input. reply data (reply data) sent from the CMX605 to the c is valid when the serial clock is high. the interface is compatible with the most common c serial interfaces such as sci, spi and microwire, and may also be easily implemented with general purpose c i/o pins controlled by a simple software routine. see figure 13 for detailed ?c-bus? timing requirements. cs serial clock command data address (01 hex = reset) = level not important note: the serial clock line may be high or low at the start and end of each transaction. hi-z reply data 7 654 321 0 figure 5: ?c-bus? transactions (single byte from m m m m c) cs serial clock command data address hi-z data to CMX605 reply data 7 654 321 0 7 654 321 0 figure 6: ?c-bus? transactions (one address and one data byte from m m m m c) cs serial clock hi-z address data from CMX605 command data reply data 7 654 321 0 7 654 321 0 figure 7: ?c-bus? transactions (one address byte from m m m m c and one reply byte from CMX605)
digital line to pots interface page 13 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4.9 ?c-bus? registers command data byte (bits 7 ? 0) addr register 7 6 5 4 3 2 1 0 $01 reset n/a n/a n/a n/a n/a n/a n/a n/a $d0 setup uncommitted amplifier 0 = disable 1 = enable tx enable: 0 = disable 1 = enable dtmf rx: 0 = disable 1 = enable spm: 0 = 12khz 1 = 16khz reserved set to 0 reserved set to 0 fsk mode: 0 = sync 1 = async fsk mode: 0 = v23 1 = bell 202 $d1 mode spm output: 0 = disable 1 = enable tone/fsk: 0 = disable 1 = enable tone/fsk: 0 = tone 1 = fsk tx level: (msb) tx level: tx level: (lsb) tone fields: (msb) tone fields: (lsb) $d3 tx data d7 d6 d5 d4 d3 d2 d1 d0 $d4 tx tones d7 d6 d5 d4 d3 d2 d1 d0 table 10: write only registers reply data byte (bits 7 ? 0) addr. register 7 6 5 4 3 2 1 0 $df status fsk mode: fsk mode: dtmf rx: dtmf rx: dtmf: dtmf: dtmf: dtmf: fsk tx data underflow fsk tx data ready status change 1 = detected 0 = notone timer timed out rx data (d3) (msb) rx data (d2) rx data (d1) rx data (d0) (lsb) table 11: read only registers notes: 1. accessing the reset register over the ?c-bus? clears all of the bits in the setup, mode, tx data, tx tones and status registers. this will initialize the device. note that this is a single-byte ?c-bus? transaction consisting solely of the address byte value $01. 2. if any of bits 5, 6 or 7 of the status register is ?1? then the irq output will be pulled low. 3. reading the status register clears the irq output and also clears bit 5 of the status register, if set. bits 6 and 7 of the status register are cleared on writing to the tx data register.
digital line to pots interface page 14 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 4.10 c-bus timings the relationship between bytes loaded onto the c-bus and the transmission of fsk bytes shown in figure 8, figure 9, and figure 10. there are many ways that the c-bus can be used to program a device. three suggestions are shown in figure 8, figure 9, and figure 10, together with typical timings. please note that the c-bus timing is not shown to the same scale as the fsk output. analog tonefsk (tx data) c-bus cs command data tx ready flag c-bus irq tx under- flow flag mode register fsk enable async mode after general reset configure setup (set b6=1 always) configure mode (set b6=1 to enable) read status load tx data with byte 1 load tx data with byte 2 load tx data with byte 3 note: c-bus timing not shown to scale 208s typ. 106s typ. byte 1 byte 2 byte 3 mark mark 833s typ. bit period = figure 8: async mode after general reset
digital line to pots interface page 15 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. analogue tonefsk (tx data) c-bus cs command data tx ready flag c-bus irq tx under- flow flag mode register fsk enable sync mode after general reset configure setup (set b6=1 always) load tx data with byte 1 configure mode (set b6=1 to enable) read status load tx data with byte 2 load tx data with byte 3 note: c-bus timing not shown to scale 208s typ. 106s typ. byte 1 byte 2 byte 2 again byte 3 833s typ. bit period = figure 9: sync mode after general reset
digital line to pots interface page 16 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. analogue tonefsk (tx data) c-bus cs command data tx ready flag c-bus irq tx under- flow flag mode register fsk enable sync mode after general reset (using alternative order of commands) configure setup (set b6=1 always) load tx data with byte 1 configure mode (set b6=1 to enable) read status load tx data with byte 2 load tx data with byte 3 note: c-bus timing not shown to scale 208s typ. 106s typ. byte 1 byte 2 byte 2 again byte 3 data n ot defined 833s typ. bit period = figure 10: sync mode after general reset (using alternative order of commands)
digital line to pots interface page 17 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 5 application when using the tone/fsk bit (bit 6) of the mode register, each tone starts from v bias and returns to v bias before ending: tonefsk enable tone / fsk: disable v bias figure 11: tone starting and stopping when switching between tones in the same column (bits 4 - 7 or bits 0 - 3) of the tx tones register, the transition will be phase continuous. however, switching to the ?off? state will immediately take the output of that tone generator to v bias . tonefsk tone 1 tone 2 tone = off v bias figure 12: tone changing tx tones register codes which do not have a frequency allocated are indicated by ?-? in the tone field tables. these code values should not be used. 5.1 telecom tones the following table provides the hex codes to be programmed into the particular tone field location for various telecommunications systems applications. the tables are not exhaustive, but list the more commonly used tones. (f +-2.5%) (hz) field 0 (hex) off $00 16.7 $01 20 $02 25 $03 35 $04 40 $05 50 $06 table 12: ringing signals
digital line to pots interface page 18 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. single tone (hz) field 0 (hex) dual tone (hz) field 0 (hex) 375.2 $60 375.2+1827 $6e 404.3 $70 404.3+1827 $7e 468 $80 468+1827 $8e 495.8 $90 495.8+1827 $9e 520.6 $a0 520.6+1827 $ae 548 $b0 548+1827 $be 562.8 $c0 562.8+1827 $ce 578.4 $d0 578.4+1827 $de 1633 $0d table 13: on hook 'cpe' alert tones group a (hz) field 0 (hex) group b (hz) field 0 (hex) 252.4 $10 468 $80 268.7 $20 495.8 $90 285.3 $30 520.6 $a0 315.5 $40 562.8 $c0 330.5 $50 595 $e0 375.2 $60 612.5 $f0 table 14: nynex (mraa) - amr alert tones (single tone) (hz) field 1 (hex) off $00 120 $10 150 $20 154 $30 250 $40 300 $50 350 $60 400 $c0 425 $04 440 $06 450 $07 480 $09 500 $0a 600 $0b 620 $0c table 15: single frequency call progress tones
digital line to pots interface page 19 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. additive mixing (hz) field 1 (hex) m ultiplicative m ixing (hz) field 1 (hex) off $00 350+440 $66 400*16.2 $b2 440+480 $f6 400*20 $a3 480+620 $fc 400*25 $94 400+425 $c4 400*33 $85 400+450 $c7 400*40 $76 425+450 $d4 400*50 $67 425+480 $f4 450*25 $e4 120+620 $1c 600*120 $fd 150+450 $27 table 16: dual frequency call progress tones (hz) field 2 (hex) off $00 941+1633 $ff 697+1209 $cc 697+1336 $cd 697+1477 $ce 770+1209 $dc 770+1336 $dd 770+1477 $de 852+1209 $ec 852+1336 $ed 852+1477 $ee 941+1336 $fd 941+1209 $fc 941+1477 $fe 697+1633 $cf 770+1633 $df 852+1633 $ef table 17: dual tone multi frequency generation (hz) field 2 (hex) off $00 950 $80 1100 $30 1300 $40 1400 $90 1800 $a0 2100 $08 2225 $09 2130+2750 $bb table 18: special information tones, fax and modem tones and customer premises alert tones
digital line to pots interface page 20 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. (hz) field 2 (hex) 700+900 $12 700+1100 $13 900+1100 $23 700+1300 $14 900+1300 $24 1100+1300 $34 700+1500 $15 900+1500 $25 1100+1500 $35 1300+1500 $45 700+1700 $16 900+1700 $26 1100+1700 $36 1300+1700 $46 1500+1700 $56 table 19: ccitt ?r1? signaling tones forward mode (hz) field 3 (hex) backward mode (hz) field 3 (hex) off $00 off $00 1380+1500 $89 1140+1020 $65 1380+1620 $8a 1140+900 $64 1500+1620 $9a 1020+900 $54 1380+1740 $8b 1140+780 $63 1500+1740 $9b 1020+780 $53 1620+1740 $ab 900+780 $43 1380+1860 $8c 1140+660 $62 1500+1860 $9c 1020+660 $52 1620+1860 $ac 900+660 $42 1740+1860 $bc 780+660 $32 1380+1980 $8d 1140+540 $61 1500+1980 $9d 1020+540 $51 1620+1980 $ad 900+540 $41 1740+1980 $bd 780+540 $31 1860+1980 $cd 660+540 $21 table 20: ccitt ?r2? signaling tones
digital line to pots interface page 21 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 6 performance specification 6.1 electrical performance 6.1.1 absolute maximum ratings exceeding these maximum ratings can result in damage to the device. min. max. unit supply (v dd - v ss ) -0.3 7.0 v voltage on any pin to v ss -0.3 v dd + 0.3 v current into or out of v dd -50 50 ma v ss -50 50 ma any other pin -20 20 ma d4/p3 package total allowable power dissipation at t amb = 25c 800 mw derating above 25c 13 mw/c above 25c storage temperature -55 125 c operating temperature -40 85 c 6.1.2 operating limits correct operation of the device outside these limits is not implied. notes min. max. unit supply (v dd - v ss ) 2.7 5.5 v operating temperature -40 85 c xtal frequency 1 3.575965 3.583125 mhz notes: 1. a xtal frequency of 3.579545mhz 0.1% is required for correct operation.
digital line to pots interface page 22 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 6.1.3 operating characteristics for the following conditions unless otherwise specified: v dd = 2.7v at t amb = 25c and v dd = 3.0v to 5.5v at t amb = -40 to 85c, xtal frequency = 3.579545mhz ? 0.1%, 0dbm corresponds to 775mv rms notes min. typ. max. unit dc parameters i dd op-amp only enabled (v dd = 5.0v) 1 2.0 ma dtmf rx only, v dd = 5.0v 1 2.8 4.5 ma tx (tones, spm) only, v dd = 5.0v 1 4.6 7.0 ma all enabled, v dd = 5.0v 1 7.2 11.0 ma op-amp only enabled (v dd = 3.3v) 1 0.75 ma dtmf rx only, v dd = 3.3v 1 1.2 2.5 ma tx (tones, spm) only, v dd = 3.3v 1 2.0 3.0 ma all enabled, v dd = 3.3v 1 3.2 5.0 ma logic ?1? input level 3 70% v dd logic ?0? input level 3 30% v dd logic input leakage current (v in = 0 to v dd ), (excluding xtal/clock input) 3 -1.0 1.0 a output logic ?1? level (i oh = 360a) v dd -0.4 v output logic ?0? level (i ol = 360a) 0.4 v irq output ?off' state current (v out = v dd ) 1.0 a fsk encoder and tx uart level at tonefsk pin 4 -1.0 0.0 1.0 dbm twist (mark level with regards to space level) -2.0 0 2.0 db tx 1200bits/sec (v23 mode) baud rate (set by uart and xtal frequency) 1194 1200 1206 baud mark (logical 1) frequency 1297 1300 1303 hz space (logical 0) frequency 2097 2100 2103 hz tx 1200bits/sec (bell 202 mode) baud rate (set by uart and xtal frequency) 1194 1200 1206 baud mark (logical 1) frequency 1197 1200 1203 hz space (logical 0) frequency 2197 2200 2203 hz tonefsk signal level level at tonefsk pin for: single tone 4 -1.0 0 1.0 dbm dual tone (per tone) 4 -4.0 -3.0 -2.0 dbm dtmf high frequency group 4 -4.0 -3.0 -2.0 dbm dtmf low frequency group 4 -6.0 -5.0 -4.0 dbm output impedance 10.0 - k w tone frequency resolution -2.0 2.0 hz tone output distortion 5 0.8 %
digital line to pots interface page 23 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. notes min. typ. max. unit dtmf decoder valid input signal levels (each tone of composite signal) 4 -29.0 -2.0 dbm not decode level (either tone of composite signal) 4 -40.0 dbm twist = high tone/low tone -9.0 10.0 db frequency detect bandwidth 1.8 4.5 % input impedance for rxin (at 100hz) 0.5 m w dial tone tolerance 7 0 db noise tolerance 7,8 -14 db tone response time 2 40.0 ms tone de-response time 2 45.0 ms tone burst detected 2 40.0 - ms tone burst ignored 2 20.0 ms pause length detected 2 40.0 ms pause length ignored 2 20.0 ms spm signal level 4, 6 -1.5 0 1.0 dbm level at spm pin 4, 6, 10 -1.0 0 0.5 db tone frequency accuracy -14.0 14.0 hz tone output distortion 5 1.2 tbd % output impedance 10.0 k w uncommitted amplifier open loop gain (input = 1mv rms at 100hz) 60.0 db unity gain bandwidth 5.0 mhz input impedance (at 100hz) 10.0 m w output impedance (open loop) 10.0 k w power-up timing device reset to reliable signal at ampout, ring, spm, tonefsk output pins 50 ms xtal/clock input 'high' pulse width 9 100 ns 'low' pulse width 9 100 ns input impedance (at 100hz) 1.0 m w gain (input = 1mv rms at 100hz) 20.0 db
digital line to pots interface page 24 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. notes: 1. at 25 c, not including any current drawn from the CMX605 pins by external circuitry other than x1, c1 and c2. 2. at nominal signal frequencies and without skew.. 3. excluding xtal/clock pin. 4. at v dd = 5.0v, load resistance greater than 40k w , signal levels are proportional to v dd . 5. frequency above 300hz. 6. spm has a soft rise and fall time of about 4.5ms. the level changes between v bias and 0dbm in 2db steps, 16 steps per rise and fall. when spm is disabled, an extra 4.5ms falling tail end of signal should be taken into consideration. 7. referenced to dtmf tone of lower amplitude. 8. bandwidth limited: 0 to 3.4khz gaussian noise. 9. timing for an external input to the xtal/clock pin. 10. over the range v dd = 3.3v to 5.5v at t amb = 25 c
digital line to pots interface page 25 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 6.1.4 timing ?c-bus? timings (see figure 13) notes min. typ. max. unit t cse cs -enable to clock-high time 100 - - ns t csh last clock-high to cs -high time 100 - - ns t loz clock-low to reply output enable time 0.0 - - ns t hiz cs -high to reply output 3-state time - - 1.0 s t csoff cs -high time between transactions 1.0 - - s t nxt inter-byte time 500 - - ns t ck clock-cycle time 500 - - ns t ch serial clock-high time 200 - - ns t cl serial clock-low time 200 - - ns t cds command data set-up time 75 - - ns t cdh command data hold time 25 - - ns t rds reply data set-up time 75 - - ns t rdh reply data hold time 0 - - ns table 21: c-bus timing note: these timings are for the latest version of the ?c-bus? as embodied in the CMX605, and allow faster transfers than the original ?c-bus? timings provided in mx-com?s publication doc. # 20480060.001. cs hi-z = level not important or undefined serial clock t cse t nxt t ck t cl t cds t rds t cdh t rdh 70% v dd 30% v dd t ch t ck t csoff t csh t hiz t loz command data command data serial clock reply data reply data 76543 21 0 76543 21 0 76543 21 0 figure 13: ?c-bus? timing
digital line to pots interface page 26 of 26 CMX605 preliminary information 2001 mx-com, inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480195.005 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective comp anies. 6.2 packaging pin 1 a b alternative pin location marking x p j y c k h e l t w z note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e h typ. max. min. dim. j p x w t y k l 0.105 (2.67) 0.093 (2.36) 0.419 (10.64) 45 7 0 10 0.050 (1.27) 0.041 (1.04) 0.413 (10.49) 0.299 (7.59) 0.050 (1.27) 0.016 (0.41) 0.390 (9.90) 0.020 (0.51) 0.003 (0.08) 0.009 (0.23) 0.0125 (0.32) 0.013 (0.33) 0.020 (0.51) 0.395 (10.03) 0.286 (7.26) z 5 5 figure 14: 16-pin soic (d4) mechanical outline: order as part no. CMX605d4 package tolerances note : all dimensions in inches (mm.) angles are in degrees typ. max. min. a b c e e1 h dim. j j1 p y t k l 0.200 (5.06) 0.262 (6.63) 0.390 (9.91). 7 0.150 (3.81) 0.810 (20.57) 0.135 (3.43) 0.100 (2.54) 0.121 (3.07) 0.300 (7.62) 0.290 (7.37) 0.325 (8.26) 0.015 (0.38) 0.070 (1.77) 0.008 (0.20) 0.015 (0.38) 0.014 (0.35) 0.023 (0.58) 0.040 (1.02) 0.065 (1.65) 0.056 (1.42) 0.064 (1.63) 0.740 (18.80) 0.240 (6.10) b a pin 1 e y e1 t k h j1 j c p l figure 15: 16-pin pdip (p3) mechanical outline: order as part no. CMX605p3

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