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xecom (1) XE0068DT XE0068DT november 2004 fcc registered daa module with dtmf transmitter/decoder description the XE0068DT is an fcc registered telephone line interface which includes a dtmf transmitter, dtmf decoder and call progress monitor. fcc rules limit the signal level that equipment can place on the telephone line. the XE0068DT incorporates an automatic gain control (agc) circuit to control the output signal level. the agc optomizes the output levele over a wide variety of input levels without introducing signal distortion. fcc rules also dictate a 2-second delay at the start of each call. this billing delay prevents information transmission during the billing period. the XE0068DT includes this billing delay. the integrated dtmf transceiver, call progress monitor and fcc registration make the XE0068DT ideal for network signalling applications. features * small size - 2.28" x 1.08" x 0.42" * user transferrable fcc part 68 registration * integrated ring detection circuit. * solid-state hookswitch control * provides 1500 volt isolation between the tele- phone line and all other circuits * includes supplemental surge protection to survive both fcc type a and type b surges. * integral 2-second billing delay (required for fcc part 68 registration) * automatic gain control optimizes transmit level for most any input level. * integral dtmf transmitter and decoder * call progress monitoring vcc o 1 26 o tip d3 o 2 d2 o 3 24 o ring d1 o 4 d0 o 5 22 o /ri /wr o 6 21 o oh /rd o 7 20 o n/c /cs o 8 19 o rcvr rs0 o 9 18 o xmit n/c o 10 17 o st/gt n/c o 11 16 o est n/c o 12 15 o cp d/v o 13 14 o gnd XE0068DT pin configuration XE0068DT block diagram d0 d1 d2 dtmf d3 transmitter tip est & receiver /rd ring /wr /cs rs0 line hook switch oh cp transformer st/gt 2-4 wire ring rcvr convertor detect /ri xmit agc billing delay d/v timer
xecom (2) XE0068DT XE0068DT mechanical specifications XE0068DT absolute maximum ratings storage temperature -25 o c to +85 o c operating temperature range * 0 o c to +70 o c maximum solder temperature 220 o c maximum time above eutectic (183 o c) 90 seconds preheat dwell time 120 to 180 seconds * the XE0068DT can be ordered with an operating temperature of -40 o c to +85 o c at extra cost. specify model number XE0068DT-itr. inches metric(mm) dim min max min max a 2.270 2.290 57.66 58.17 b 1.065 1.095 27.05 27.81 c 0.420 0.430 12.32 13.08 d 0.890 0.910 22.61 23.11 e 1.190 1.210 30.23 30.73 f 0.125 0.200 3.18 5.08 g 0.080 0.100 2.03 2.54 h 0.530 0.550 13.46 13.97 j 0.090 0.110 2.29 2.79 k 0.020 0.025 0.51 0.64 b c d e f g h h k j denotes pin 1
xecom (3) XE0068DT recommended parts designation description c1, c2 470 picofarad, 3000 volts (sprague part number 30ga-t47) fb1, fb2 ferrite beads (tdk part number cb30-453215b) XE0068DT call progress detection circuit XE0068DT typical connection diagram st/gt est cp2 XE0068DT +5 volts +5 volts to irq 1n4148 374k 150k 1n4148 0.1 ufd 0.15 ufd 1m 10k 10k 10k 10k lm339 - +
xecom (4) XE0068DT XE0068DT pin descriptions pin name i/0 description 1 vcc --- +5 volts 2-5 d0-d3 i/o these signals represent the 4-bit data bus which carries the dtmf information per the chart below. 6 /wr i read and write determine the direction of dtmf data. a low on /wr with /rd high allows the processor to write to the XE0068DT. 7 /rd i read and write determine the direction of dtmf data. a low on /rd with /wr high allows the processor to read from the XE0068DT. 8 /cs i a low on chip select, selects the xe0068 dtmf data bus. 9 rs0 i this input selects the register to be used. a low selects the data register and a high slects the status or control registers. 13 d/v i a low on voice/data selects a transmit level of 0 dbm for voice or dtmf; a high sets a -9 dbm transmit level for data transfer. 14 gnd --- ground 15 cp o in dtmf mode cp acts as an interrupt. cp goes low when a valid dtmf tone is transmitted or received. in call progress mode cp provides a square wave repre- sentation of the call progress signal on the phone line. 16 est o goes high to indicate that a valid tone pair has been detected. a momentary loss of signal causes est to go low. 17 st/gt i/o as an input, st/gt latches the dtmf code into the receive data register when the threshold voltage is reached. as an output, st/gt goes high to disable the guard timer after the threshold voltage is reached. 18 xmit i analog input signal to the line interface, input impedance on xmit is typically 10 kohms at 1800 hz. signals from -15 to +5 dbm will be placed on the line at - 10dbm + 1 dbm. 19 rcvr o analog output signal from the 2-4 wire converter, the output impedence of rcvr is typically 10 ohms at 1800 hz. 21 oh i hookswitch control. a high closes the internal relay to connect the equipment to the phone line. 22 /ri o ring indicate, output, active low, ttl, indicates the modem is receiving a ring sig- nal. 24 ring --- ring connection to the phone line (rj11 pin 4). 26 tip --- tip connection to the phone line (rj11 pin 3)
xecom (5) XE0068DT XE0068DT register selection table 1 below shows the combination of rs0, /wr, and /rd to select each register. table 1 rs0 /wr /rd function 0 0 1 write to transmit data register 0 1 0 read from receive data register 1 0 1 write to control register a or b 1 1 0 read from status register dtmf codes table 2 below shows the 4-bit codes applied to d0-d3 to represent each dtmf digit. table 1 dtmf digit 1 2 3 4 5 6 7 8 9 0 * # a b c d d0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 d1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 d2 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 d3 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 XE0068DT status register table 3 below defines the bit codess which can be read from the status register. table 3 bit indicator status set status cleared 0 irq an interrupt has occurred interrupt inactive, cleared after status register read 1 transmit data register transmitter ready for status has been read or empty new data is in non-burst mode 2 receive data register receive data register status register has been full contains valid data read 3 delayed steering set upon detection cleared upon detection of of the absence of a a valid dtmf signal dtmf signal
xecom (6) XE0068DT XE0068DT control register a table 4 below defines the XE0068DT operations set by the bits in control register a. table 4 bit signal function 0 tout tone output control: this bit controls the tone transmit functions. a high enables the tone output; a low turns tone output off. 1 cp/dtmf call progress or dtmf mode: a logic high enables the XE0068DT to detect call progress tones. a low enables dtmf send and receive mode. in call progress mode a square wave representation of the incoming signal will be presented on the cp output, irq enabled. dtmf tones cannot be decoded in call progress mode. 2 irq interrupt enable: a logic high enables the interrupt function. when irq enabled and dtmf mode is selcted, the cp output will go low when either a valid dtmf signal is received or the transmitter is ready for more data (burst mode). 3 rsel register select. a logic high on bit 3 sets the XE0068DT to select control register b for the next write cycle. after writing to control register b, the next control register write cycle will be directed to control register a. XE0068DT control register b table 5 below defines the XE0068DT operations set by the bits in control register b. table 4 bit signal function 0 burst burst mode: a logic low enables burst mode. when burst mode is activated, dtmf tones can be transmitted by writing the correct code to the transmit register. the XE0068DT the transmits a tone burst of 51 milliseconds on and 51 milliseconds off. in call progress mode the duration of the tone burst and pause after the tone burst are doubled to 102 milliseconds. when not in burst mode the XE0068DT transmits the tone as long as tout, status register a, is active. 1 test test mode: a logic high enables the test mode in the XE0068DT. when the test and dtmf modes are selected, the signal on cp reflects the state of the delayed steering bit of the status register. 2 s/d single or dual tone generation: a logic high sets the XE0068DT to generate a single tone rather than transmiting two tones. 3 c/r column or row: control register b bit 3 determines if the row or column tone is transmitted when single tone operation is selected. a logic high selects the row tone output
xecom (7) XE0068DT XE0068DT operational modes burst mode burst mode is used to transmit dtmf signals of specific duration. the XE0068DT transmitter sends symmetric tone bursts which are on for 51 milliseconds and off for 51 milliseconds. this is a standard interval for central office switching. when call progress mode is also selected ex- tended bursts of 102 milliseconds can be sent. single tone generation the XE0068DT may be used to generate single tones as well as tone pairs. control register b regulates single tone transmission. call progress mode call progress mode allows detection of the various tones used to identify the status of a call. they include ring back, busy tone dial tone, etc. in call progress mode the XE0068DT provides a square wave representation of these signals on the cp pin. the system host can de- code the incoming call progress tones. initialization procedure description control lines data bits rs0 wr rd d3 d2 d1 d0 read status register 1 1 0 x x x x write to control register 1 0 1 0 0 0 0 write to control register 1 0 1 0 0 0 0 write to control register 1 0 1 1 0 0 0 write to control register 1 0 1 0 0 0 0 write to control register 1 0 1 0 0 0 0 read status register 1 1 0 x x x x * performs a software reset on the XE0068DT tone frequency (hz) cadence level description dial tone 350 + 400 steady -13 dbm indicates the network is ready to receive dialing signals ringback 440 + 480 2 sec. on -19 dbm indicates the called line is ringing 4 sec. off busy tone 480 + 620 .5 sec. on -24 dbm indicates the called line has been reached but is .5 sec off currently in use. reorder 480 + 620 .25 sec. on -24 dbm indicates the switching path is busy .25 sec off partial dial tone 480 steady -17 dbm notifies the calling party that dialing has not begun in the allotted time or that not enough digits have been dialed. call progress tone definitions the chart below shows the signal characteristics for the most common call progress tones in the united states. check the frequency and cadence on the cp line to identify signals in call progress mode.
xecom (8) XE0068DT power supply current ring indicate active 20 ma coupler match output impedance 531 536 541 ohms agc input range maintaining steady output level -40 0 dbm agc output level d/v held high -20 -9 dbm agc output level d/v held low -11 0 dbm billing delay oh activated 2.0 2.3 seconds transhybrid loss at 1000 hz -34 dbm receive loss at 1000 hz -1.0 0 1.0 db ring detect min. ac voltage between tip & ring 38 vrms sensitivity type b ringer ring indicate ring voltage present on tip & ring 0.2 0.5 volts output voltage loop current switch on: (off-hook) 2.0 3.0 volts control voltage off: (on-hook) 0.2 0.5 volts loop current switch off-hook 0.1 2.0 ma control current loop current off-hook current draw from 0 20 100 ma telephone line data bus, low level input voltage 0.8 volts high level input voltage 2.0 volts receive sensitivity dtmf tones -37 dbm call progress tones -30 dbm tone duration to detect 40 msec tone frequencies dtmf transmission, 697 hz 770 852 941 1209 1336 parameter conditions min typ max units XE0068DT electrical specifications (vcc = +5 volts + 5%, ta = 70 deg c.)
xecom (9) XE0068DT XE0068DT read/write clock pulse timing signal definition min typ max units t r read/write rise time 20 nanoseconds t f read/write fall time 20 nanoseconds t cyc read/write cycle period 250 nanoseconds t pwh read/write pulse width high 100 nanoseconds t pwl read/write pulse width low 150 nanoseconds rd/wr t cy c t r t f t pwh t pwl
xecom (10) XE0068DT XE0068DT read timing signal definition min typ max units t as address setup time 23 nanoseconds t ah address hold time 26 nanoseconds t pwl read pulse width low 150 nanoseconds t pwh read pulse width high 100 nanoseconds t ddr read to valid data 100 nanoseconds t dhr data hold time (read) 22 nanoseconds rd t ddr t as t ah t pwl t pwh cs/rs0 t dhr data bus
xecom (11) XE0068DT XE0068DT write timing signal definition min typ max units t as address setup time 23 nanoseconds t ah address hold time 26 nanoseconds t pwl write pulse width low 150 nanoseconds t pwh write pulse width high 100 nanoseconds t dsw data setup time (write) 45 nanoseconds t dhw data hold time (write ) 10 nanoseconds wr t dsw t as t ah t pwl t pwh cs/rs0 t dhw data bus
xecom (12) XE0068DT this product complies with p art 68 of the fcc rules and regulations. with each device shipped, t here is a label which contains, among other information, the fcc registration number and ringer equivalence number (ren) for this product. you must, upon request, give this information to your telephone company. mounting this device in the final assembly must be made in such a manner as to preserve the high voltage protection between the tip/ring connection and the rest of the system. typically, this may be accomplished by maintaining a minimum spacing .100 mils between the tip/ring trace to the rj-11c jack and low voltage portion of the system. no additional circuitry may be attached between tip/ring and the telephone line connection unless specifically allowed in the rules. the ren is useful to determine the quantity of devices you may connect to the telephone line and still have all of these devices ring when the number is called. in most, but not all areas, the sum of the rens of all devices connected to one line should not exceed five (5.0). to be certain of the number of devices you may connect to the line, as determined by the ren, you should contact the local telephone company to determine the maximum ren for your calling area. if your system causes harm to the telephone network, the telephone company may discontinue service temporarily. if possible, they will notify you in advance. if advance notification is not practical, you will be notified as soon as possible. your telephone company may make changes in its facilities, equipment, operations or procedures that could affect proper functioning of your equipment. if they do, you will be notified in advance to give you an opportunity to maintain uninterrupted service. if you experience trouble with the device, please contact xecom an (408) 945-6640 for information on obtaining service or repairs. the telephone company may ask you to disconnect this device from the network until the problem has been corrected or until you are sure that the device is not malfunctioning. there are no repairs that can be made by the customer to the xe0068. the device may not be used on coin service lines provided by the telephone company (this does not apply to private coin telephone applications which use standard telephone lines). connection to party lines is subject to state tariffs. fcc information fcc registration number dweusa-75283-dp-w ringer equivalence 0.5b telephone jack rj11c
xecom (13) XE0068DT terms of sale devices sold by xecom are covered by the warranty provisions appearing in its terms of sale only. xecom makes no warranty, express, statutory, implied, or by description regarding the information set forth herein, or regarding the freedom of the described devices from patent infringement. xecom makes no warranty of merchantability or fitness for any purposes. xecom reserves the right to discontinue production and change specifications and prices at any time and without notice. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing and authorization by xecom for such application. xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a xecom life support policy xecom's products are not authorized for use as critical components in life support devices or systems. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions pro- vided in the labeling, can be reasonably expected to result in significant injury to the user. a critical component is any component of a life support device or system whose failure to perform can be rea- sonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness. copyright, xecom ? 2002 while xecom, inc. has made every effort to ensure that the information presented here is accurate, xecom will not be liable for any damages arising from errors or omission of fact. xecom reserves the right to modify specifications and/or prices without notice. product mentioned herein are used for identification purposes only and may be trade- marks and/or registered trademarks of their respective companies. xecom inc o r p o r a t e d 3 74 t u r quoise s t re e t, m il p itas, c a 9 5035 p h : 4 0 8 - 9 4 5 - 6 6 40 fa x : 40 8- 9 42-13 4 6 email: info@xecom.com

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