Datasheet XE0068DT Datasheet (XECOM)

FCC Registered DAA Module with DTMF Transmitter/Decoder

XE0068DT

2/99

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" * FCC Part 68 Registered * Ring Detection and Hookswitch Control * 1500 Volt Isolation; * 800 Volt Surge Protection; * An Integral 2-Second Billing Delay * Auotomatic Gain Control optimizes transmit level

for most any input level. * Integral DTMF transmitter and decoder * Call progress Monitor

XE0068DT Block Diagram

D0 D1 D2 DTMF D3 Transmitter Tip

ESt & Receiver

/RD Ring

/WR

/CS

RS0 Line Hook Switch OH

CP Transformer

StGT

XE0068DT Pin Configuration

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

RCVR Convertor Detect

2-4 Wire Ring

N/C o10 17 o StGT N/C o 11 16 o ESt N/C o 12 15 o CP

/RI

D/V o 13 14 o GND

XMIT

D/V Timer

AGC Billing Delay

XECOM (1) XE0068DT

XE0068DT Mechanical Specifications

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

D

G

C

Denotes Pin 1

J

H

A

B

K

E

F

XE0068DT ABSOLUTE MAXIMUM RATINGS

Storage T emperature -25O C to +85O C

Operating T emperature Range * 0O C to +70O C

Maximum Solder T emperature 220O C

Maximum Time Above Eutectic (183O C) 90 seconds

Preheat Dwell Time 120 to 180 seconds

* The XEV90 can be ordered with an Operating Temperature of -40O C to +85O C at extra cost.

Specify Industrial T emperature Range (ITR).

XECOM (2) XE0068DT

XE0068DT Typical Connection Diagram

Recommended Parts

Designation Description

C1, C2 47 picoFarad, 3000 Volts (Sprague part Number 30GA-T47

FB1, FB2 Ferrite Beads (TDK part Number CB30-453215B)

XE0068DT Call Progress Detection Circuit

XE0068DT

5volts

St/GT

ESt

CP

5volts

.1ufd

2N2907

374K

3K

1N4148

10K

150K

10K

5volts

10K

LM339

-

+

10K

1N4148

1M

.15 ufd

to IRQ

XECOM (3) XE0068DT

XE0068DT Pin Descriptions

PIN NAME I/0 DESCRIPTION

1 VCC --- +5 Volts

2-5 D0-D3 I/O These singals 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 low

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.

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 CallProgress Mode CP provides a square wave representation 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 (4) XE0068DT

XE0068DT Register Selection

T able 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

T able 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 67890*#ABCD

D0 101010101010101 0 D1 011001100110011 0 D2 000111100001111 0 D3 000000011111111 0

XE0068DT Status Register

T able 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 Interupt Active 1 Transmit Data Register Transmitter Ready for Status has been read or

Empty New Data is in non-burst mode

2 Receive Data Register ReceiveData 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 vailid DTMF signal

DTMF signal

XECOM (5) XE0068DT

XE0068DT Control Register A

T able 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 outputoff.

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 mod a square wavee 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 Enaable: A logic high enables the interrupt function. When

IRQ and DTMF mode are disabled, the CP output will go low when either a valid DTMF signal is received or the transmitter is ready for more data.

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

T able 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 teh XE0068DT .

When the T est 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 the 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 trow tone output

XECOM (6) 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 Single tones , rather than tone pairs , may also be generated. 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 Control Lines Data Bits

RS0 WR RD B3 B2 B1 B0 Read Status Register 1 1 0 XXXX Write to Control Register 1 0 1 0000 Write to Control Register 1 0 1 1000 Write to Control Register 1 0 1 0000 Write to Control Register 1 0 1 0000

* 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 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 T one 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.

XECOM (7) XE0068DT

XE0068DT Electrical Specifications (Vcc = +5 Volts + 5%, Ta = 70 deg C.)

Parameter Conditions Min Typ Max Units

Power Supply Current Ring Indicate Active 20 mA

Coupler Match Output impedance of external 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) Control Voltage 2.0 3.0 volts control voltage OFF: (on-hook) 0.2 0.5 volts

Loop Current Switch Off-hook Control Current 0.1 2.0 mA

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

T one Duration to Detect 40 msec

Tone Frequencies DTMF Transmission, 697 hz

770 852

941 1209 1336

XECOM (8) XE0068DT

XE0068DT Read/Write Clock Pulse Timing

T

CYC

T

R

T

PWH

RD/WR

Signal Definition Min Typ Max Units

TR Read/Write Rise Time 20 nanoseconds TF Read/Write Fall Time 20 nanoseconds

TCYC Read/Write Cycle period 250 nanoseconds

TRWH Read/Write pulse width high 100 nanoseconds

F

T

PWL

TPWL Read/Write pulse width low 150 nanoseconds

XECOM (9) XE0068DT

XE0068DT Read Timing

RD

T

PWL

T

PWH

T

AS

T

AH

CS, RSO

T

DHR

DATA BUS

T

DDR

Signal Definition Min Typ Max Units

TAS Address Setup Time 23 nanoseconds

TAH Address Hold Time 26 nanoseconds

TPWH Read Pulse Width High 100 nanoseconds

TPWL Read Pulse Width Low 150 nanoseconds TDDR Read to Valid Data 100 nanoseconds

TDHR Data Hold Time (Read) 22 nanoseconds

XECOM (10) XE0068DT

XE0068DT Write Timing

WR

T

PWL

T

PWH

T

AS

T

AH

CS, RSO

T

DHW

DATA BUS

T

DSW

Signal Definition Min Typ Max Units

TAS Address Setup Time 23 nanoseconds

TAH Address Hold Time 26 nanoseconds

TPWH Write Pulse Width High 100 nanoseconds

TPWL Write Pulse Width Low 150 nanoseconds TDDR Data Setup Time (Write) 45 nanoseconds TDHR Data Hold Time (Write)10This product complies with Part 68 of the FCC Rules and Regulations.

With each device shipped,there is a label which contains, among other infor mation, the FCC Registration Number and Ringer Equivalence Number

company.

(REN) for this product. You must, upon request, give this information to your telephone

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.

XECOM (11) XE0068DT

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

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

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.

(REN) for this

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 DWEUSA-75283-DP-W Ringer Equivalence 0.5B Telephone Jack RJ11C

XECOM (12) 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 © 1999 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.

Incorporated

Xecom 374 Turquoise Street, Milpitas, CA 95035

Ph:408-945 -6640 Fax:408 -942-1346 Email: [email protected]

XECOM (13) XE0068DT