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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 telephone 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
XE0068DT Block Diagram
D0 D1 D2 D3 ESt /RD /WR /CS RS0 CP St/GT
XE0068DT Pin Configuration
VCC o 1 26 o Tip 24 o Ring 22 o /RI 21 o OH 20 o N/C 19 o RCVR 18 o XMIT 17 o St/GT 16 o ESt 15 o CP 14 o GND
DTMF Transmitter & Receiver
D3
Tip Ring
o2 o3 o4 o5 o6
D2 D1 D0 /WR
Line Transformer
Hook Switch
OH
/RD o 7 /CS o 8 RS0 o9 o 10 o 11 o 12 o 13 N/C N/C N/C D/V
RCVR
2-4 Wire Convertor
Ring Detect /RI
XMIT AGC D/V Billing Delay Timer
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XE0068DT
XE0068DT Mechanical Specifications
Inches Min Max 2.270 2.290 1.065 1.095 0.420 0.430 0.890 0.910 1.190 1.210 0.125 0.200 0.080 0.100 0.530 0.550 0.090 0.110 0.020 0.025 Metric(MM) Min Max 57.66 58.17 27.05 27.81 12.32 13.08 22.61 23.11 30.23 30.73 3.18 5.08 2.03 2.54 13.46 13.97 2.29 2.79 0.51 0.64
Dim A B C D E F G H J K
B
Denotes Pin 1
KF C D G H E J H
XE0068DT ABSOLUTE MAXIMUM RATINGS
Storage Temperature Operating Temperature Range * Maximum Solder Temperature Maximum Time Above Eutectic (183O C) Preheat Dwell Time -25O C to +85O C 0O C to +70O C 220O C 90 seconds 120 to 180 seconds
* The XE0068DT can be ordered with an Operating Temperature of -40O C to +85O C at extra cost. Specify Model Number XE0068DT-ITR.
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XE0068DT
XE0068DT Typical Connection Diagram
Recommended Parts
Designation C1, C2 FB1, FB2 Description 470 picoFarad, 3000 Volts (Sprague part Number 30GA-T47) Ferrite Beads (TDK part Number CB30-453215B)
XE0068DT Call Progress Detection Circuit
+5 Volts
XE0068DT
St/GT
0.1 uFd 10K LM339 10K
10K 374K
+ 10K
ESt CP2
150K 1N4148 1N4148 +5 Volts 0.15 uFd
1M
To IRQ
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XE0068DT
XE0068DT Pin Descriptions
PIN
1 2-5 6 7 8 9 13 14 15
NAME
VCC D0-D3 /WR /RD /CS RS0 D/V GND CP
I/0
--I/O I I I I I --O
DESCRIPTION
+5 Volts These signals represent the 4-bit data bus which carries the DTMF information per the chart below. Read and Write determine the direction of DTMF data. A low on /WR with /RD high allows the processor to write to the XE0068DT. Read and Write determine the direction of DTMF data. A low on /RD with /WR high allows the processor to read from the XE0068DT. A low on Chip Select, selects the XE0068 DTMF data bus. This input selects the register to be used. A low selects the data register and a high slects the status or control registers. 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. Ground 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 representation of the call progress signal on the phone line. Goes high to indicate that a valid tone pair has been detected. A momentary loss of signal causes ESt to go low. 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. 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. Analog output signal from the 2-4 wire converter, the output impedence of RCVR is typically 10 ohms at 1800 hz. Hookswitch control. A high closes the internal relay to connect the equipment to the phone line. Ring Indicate, output, active low, TTL, indicates the modem is receiving a ring signal. Ring connection to the phone line (RJ11 Pin 4). Tip Connection to the phone line (RJ11 Pin 3)
16 17
ESt St/GT
O I/O
18
XMIT
I
19 21 22 24 26
RCVR OH /RI Ring Tip
O I O -----
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XE0068DT
XE0068DT Register Selection
Table 1 below shows the combination of RS0, /WR, and /RD to select each register. Table 1 RS0 0 0 1 1 /WR 0 1 0 1 /RD 1 0 1 0 Function Write to Transmit Data Register Read from Receive Data Register Write to Control Register A or B 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 D0 D1 D2 D3 1 1 0 0 0 2 0 1 0 0 3 1 1 0 0 4 0 0 1 0 5 1 0 1 0 6 0 1 1 0 7 1 1 1 0 8 0 0 0 1 9 1 0 0 1 0 0 1 0 1 * 1 1 0 1 # 0 0 1 1 A 1 0 1 1 B 0 1 1 1 C 1 1 1 1 D 0 0 0 0
XE0068DT Status Register
Table 3 below defines the bit codess which can be read from the status register. Table 3 Bit 0 1 2 3 Indicator IRQ Transmit Data Register Empty Receive Data Register Full Delayed Steering Status Set An interrupt has occurred Transmitter Ready for New Data Receive Data Register contains valid data Set upon detection of the absence of a DTMF signal Status Cleared Interrupt inactive, Cleared after Status Register Read Status has been read or is in non-burst mode Status Register has been Read Cleared upon detection of a valid DTMF signal
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XE0068DT
XE0068DT Control Register A
Table 4 below defines the XE0068DT operations set by the bits in Control Register A. Table 4 Bit 0 1 Signal TOUT CP/DTMF Function Tone Output Control: This bit controls the tone transmit functions. A high enables the tone output; a low turns tone output off. 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. 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). 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.
2
IRQ
3
RSEL
XE0068DT Control Register B
Table 5 below defines the XE0068DT operations set by the bits in Control Register B. Table 4 Bit 0 Signal Burst Function 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. 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. Single or Dual Tone Generation: A logic high sets the XE0068DT to generate a single tone rather than transmiting two tones. 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
1
Test
2 3
S/D C/R
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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 extended 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 decode the incoming call progress tones.
Initialization Procedure
Description Read Status Register Write to Control Register Write to Control Register Write to Control Register Write to Control Register Write to Control Register Read Status Register Control Lines RS0 WR RD 1 1 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1 1 1 1 0 D3 X 0 0 1 0 0 X Data Bits D2 X 0 0 0 0 0 X D1 X 0 0 0 0 0 X D0 X 0 0 0 0 0 X
* Performs a software reset on the XE0068DT
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. Tone Dial Tone Ringback Busy Tone Reorder Partial Dial Tone Frequency (Hz) 350 + 400 440 + 480 480 + 620 480 + 620 480 Cadence Steady 2 sec. On 4 sec. Off .5 sec. On .5 sec Off .25 sec. On .25 sec Off Steady Level -13 dBm -19 dBm -24 dBm -24 dBm -17 dBm Description Indicates the network is ready to receive dialing signals Indicates the called line is ringing Indicates the called line has been reached but is currently in use. Indicates the switching path is busy Notifies the calling party that dialing has not begun in the allotted time or that not enough digits have been dialed.
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XE0068DT
XE0068DT Electrical Specifications (Vcc = +5 Volts + 5%, Ta = 70 deg C.)
Parameter
Power Supply Current Coupler Match AGC Input Range AGC Output Level AGC Output Level Billing Delay Transhybrid Loss Receive Loss Ring Detect Sensitivity Ring Indicate Output Voltage Loop Current Switch Control Voltage Loop Current Switch Control Current Loop Current
Conditions
Ring Indicate Active Output impedance Maintaining steady output level D/V held high D/V held low OH activated at 1000 Hz at 1000 Hz Min. AC voltage between Tip & Ring Type B ringer Ring Voltage present on Tip & Ring
Min
Typ
20
Max
Units
mA
531 -40 -20 -11 2.0
536
541 0 -9 0
ohms dBm dBm dBm seconds dBm
2.3 -34
-1.0 38
0
1.0
dB vrms
0.2
0.5
volts
ON: (off-hook) OFF: (on-hook) Off-hook
2.0
3.0 0.2 0.1 0.5 2.0
volts volts mA
Off-Hook current draw from Telephone Line Low Level Input Voltage High Level Input Voltage
0
20
100
mA
Data Bus,
0.8 2.0 -37 -30 40
volts volts dBm dBm msec hz
Receive Sensitivity
DTMF tones Call Progress Tones
Tone Duration to Detect Tone Frequencies DTMF Transmission, 697 770 852 941 1209 1336
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XE0068DT
XE0068DT Read/Write Clock Pulse Timing
tcyc tr tpwh tf tpwl
RD/WR
Signal tr
t t t t f
Definition Read/Write Rise Time Read/Write Fall Time Read/Write Cycle period Read/Write pulse width high Read/Write pulse width low
Min
Typ
Max 20 20
Units nanoseconds nanoseconds nanoseconds nanoseconds nanoseconds
cyc pwh pwl
250 100 150
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XE0068DT
XE0068DT Read Timing
RD
tas tpwl tah tpwh
CS/RS0
tddr tdhr
Data Bus
Signal tas
t t t t t ah
Definition Address Setup Time Address Hold Time Read Pulse Width Low Read Pulse Width High Read to Valid Data Data Hold Time (Read)
Min 23 26 150
Typ
Max
Units nanoseconds nanoseconds nanoseconds
pwl pwh ddr dhr
100 100 22
nanoseconds nanoseconds nanoseconds
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XE0068DT
XE0068DT Write Timing
WR
tas tpwl tpwh tah
CS/RS0
tdsw tdhw
Data Bus
Signal tas
t t t t t ah
Definition Address Setup Time Address Hold Time Write Pulse Width Low Write Pulse Width High Data Setup Time (Write) Data Hold Time (Write)
Min 23 26 150
Typ
Max
Units nanoseconds nanoseconds nanoseconds
pwl pwh dsw dhw
100 45 10
nanoseconds nanoseconds nanoseconds
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XE0068DT
FCC Information
This product complies with Part 68 of the FCC Rules and Regulations. With each device shipped,there 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 Registration Number Ringer Equivalence Telephone Jack
DWEUSA-75283-DP-W 0.5B RJ11C
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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 provided 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 reasonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness.
Copyright, Xecom (c) 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 trademarks and/or registered trademarks of their respective companies.
Xecom Incorporated 374 Turquoise Street, Milpitas, CA 95035 Ph:408-945-6640 Fax:408-942-1346 Email: info@xecom.com
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XE0068DT

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