ETC XE0068DT

xecom
XE0068DT
2-18-94
FCC Registered Phone Line Interface with Tone Transmitter/Decoder
Description
The XE0068DT is an FCC registered
telephone line interface which includes a
DTMF transmitter, decoder and call progress
monitor. FCC rules limit transmit level and
require a 2-second billing delay at the start
of each call. The XE0068DT does not
merely clamp the incoming signal which
could cause signal distortion; but, uses an
Automatic Gain Control circuit to optimize
the transmit level over a wide range of input
signal levels. The integral DTMF transmitter,
decoder, and call progress monitor makes
the XE0068DT ideal for network signalling
applications.
Block Diagram
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 any input level.
* Integral DTMF transmitter and decoder
* Call progress Monitor
PIN CONFIGURATION
CAUTION:
Pins 24 & 26 have 1500V isolation
from the rest of the circuitry. This
isolation must be preserved
Pin Descriptions
PIN
1
2-5
NAME
I/0
DESCRIPTION
VCC
---
+5 Volts
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 Call Progress 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 signal.
24
Ring
---
Ring connection to the phone line (RJ11 Pin 4).
26
Tip
---
Tip Connection to the phone line (RJ11 Pin 3)
2/XECOM
XE0068DT
Register Selection
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
1
1
0
Read from Control Register
DTMF Digit Codes
Data Bits
DTMF Digits
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
Status Register A
Bit
Indicator
Status Set
Status Cleared
0
IRQ
An interrupt has occurred
Interupt Inactive
1
Transmit Data Register
Empty
Transmitter ready for new
data
Status has been read or is in
non-burst mode
2
Receive Data Register
Full
The Receive Data Register
contains valid data
Status register has been read
3
Delayed Steering
Set upon valid detection of
the absence of a DTMF
signal
cleared upon detection of a
valid DTMF signal
XE0068DT
XECOM/3
Control Register A
Bit Signal
Function
0
TOUT
Tone output control: This bit controls all tone transmit functions. A high
enables the tone output; a logic low turns the tone output off.
1
CP/DTMF
Call Progress/DTMF Mode: A logic high enables the XE0068DT to receive
call progress tones. A low enables DTMF mode for sending or receiving
DTMF tones. In call progress mode, a square wave representation of the
incoming signal will be present on the CP output if IRQ has been enabled.
DTMF tones cannot be detected in the Call Progress mode. Only tones in
the 250 to 600 Hz range can be detected.
2
IRQ
Interrupt Enable: A logic high enables the interrupt function. When IRQ and
DTMF Mode are enabled, the CP output will go lo when either a valid
DTMF signal is received or the transmitter is ready for more data.
3
RSEL
Register Select: A logic high selects Control Register B for the next write
cycle. After writing to Control Register B, the following control register write
cycle will be directed to Control Register A.
Control Register B
Bit Signal
Function
0
BURST
1
Test
Test Mode: A logic high enables XE0068DT test mode. When test and
DTMF modes are selected, the signal on CP will be reflect the state of the
delayed steering bit of the status register.
2
S/D
Single or Dual Tone: A logic high selects single tone generation a low
selects dual tone generation. Selection of single tone frequencies requires
the use of Control Register B bit 3 as well.
3
C/R
Column or Row Tone Selection: A logic high selects a colomn tone output,
a low selects a row tone output.
4/XECOM
Burst Mode: A logic low enables burst mode. When activated, DTMF tones
can be transmitted by writing the correct code into the transmit register.
The XE0068DT then transmits the tone burt, typically 51 milliseconds on, 51
milliseconds off, changes the status register to Transmit Data Register
Empty, and provides an interrupt. In Call Progress mode tone burst and
pause durations are doubled to 102 milliseconds. When burst mode is
inactive duration is determined by TOUT. (Control Register A)
XE0068DT
Electrical Specification
(Vcc=+5v ±5%, Ta=0 to 70 deg C)
Parameter
Conditions
Min
Typ
Max Units
Power Supply Current
Ring Indicate Active
Coupler Match
Output impedance of external
531
AGC Input Range
Maintaining steady output level
-15
AGC Output Level
D/V held high
-11
-10
-9
dBm
AGC Output Level
D/V held low
-2
-1
0
dBm
2.0
2.3
seconds
Billing Delay
20
536
mA
541
ohms
+10
dBm
Transhybrid Loss
at 1000 Hz
-27
dBm
Receive Loss
at 1000 Hz
0
dB
Ring Detect
Sensitivity
Min. AC voltage between Tip &
Ring Type B ringer
Ring Indicate
Output Voltage
Ring Voltage present on Tip &
Ring
Loop Current Switch
control voltage
ON: (off-hook) Control Voltage
OFF: (on-hook)
Loop Current Switch
Off-hook Control Current
Loop Current
OFF-Hook current draw from
Telephone Line
Data Bus,
Low Level Input Voltage
High Level Input Voltage
DTMF tones
Call Progress Tones
Receive Sensitivity
38
vrms
0.2
0.5
volts
3.0
0.2
0.5
volts
volts
0.1
0.2
mA
20
100
mA
0.8
2.0
volts
volts
-37
-30
dBm
dBm
2.0
0
Tone Duration to Detect
Tone Frequencies
XE0068DT
40
DTMF Transmission,
697
770
852
941
1209
1336
1477
1633
msec
hz
XECOM/5
Typical Connection Diagram
Call Progress Detection Circuit
6\XECOM
XE0068DT
Operational ModesControl
Burst Mode
Register A
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*Control
Description
Control Lines
RS0 WR RD
Register A
B3
Data Bits
B2 B1 B0
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
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
* Performs a software reset on the XE0068DT
XE0068DT
XECOM/7
Call Progress Tone Definitions
Tone
Frequency
(Hz)
Cadence
ON/OFF
Level
Description
Dial Tone
350 + 400
Steady
-13 dBm
indicates the network is ready to
receive dialling signals;
Ringback
440 + 480
2 sec./4 sec.
-19 dBm
Indicates the called line is
ringing;
Busy Tone
480 + 620
.5 sec./.5 sec.
-24 dBm
Called line has been reached
but is currently in use.
Reorder
480 + 620
.25 sec./.25 sec
-24 dBm
Indicates the switching path is
busy.
Partial
Dial Tone
480
Steady
-17 dBm
Notifies calling party dialing
has not begun in the allotted
time or not enough digits have
been dialed;
Read/Write Clock Pulse
Signal
Definition
TR
RD/WR rise time
20
nanoseconds
TF
RD/WR fall time
20
nanoseconds
TCYC
RD/WR cycle period
250
nanoseconds
TPWH
RD/WR pulse width high
100
nanoseconds
TPWL
RD/WR pulse width low
8/XECOM
Min
150
Typ
Max
Units
nano seconds
XE0068DT
Read Timing
Signal
TAS
TAH
TPWH
TPWL
TDDR
TDHR
Definition
Address setup time
Address hold time
RD/WR pulse width high
RD/WR pulse width low
Read to Valid Data
Data hold time (Read)
Min
23
26
Typ
Max
100
150
100
22
Units
nanoseconds
nanoseconds
nanoseconds
nano seconds
nanoseconds
nanoseconds
Write Timing
Signal
TAS
TAH
TPWH
TPWL
TDDR
TDHR
XE0068DT
Definition
Address setup time
Address hold time
RD/WR pulse width high
RD/WR pulse width low
Data Setup time (write)
Data hold time (write)
Min
23
26
Typ
100
150
45
10
Max
Units
nanoseconds
nanoseconds
nanoseconds
nano seconds
nanoseconds
nanoseconds
XECOM/9
Mechanical Specifications
DIM
A
B
C
D
E
F
G
H
J
K
INCHES
METRIC(MM)
MIN
MAX
MIN
2.270
1.065
0.420
0.890
1.190
0.125
0.080
0.530
0.090
0.020
2.290
1.095
0.430
0.910
1.210
0.200
0.100
0.550
0.110
0.025
57.66
27.05
12.32
22.61
30.23
3.18
2.03
13.46
2.29
0.51
XECOM\10
MAX
58.17
27.81
13.08
23.11
30.73
5.08
2.54
13.97
2.79
0.64
Pins are 0.025" square, tin plated
Recommended PCB hole size is 0.056"
XE0068DT
FCC Instructions
This product complies with part 68 of the FCC Rules and Regulations. With each device shipped,
ther is a lable which contains, among other informaton, the FCC Registration Number and Ringer
EquivalenceNumber (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 ave 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 tlephone 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.
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-XXXXX-XX-X
JACK RJ11C RINGER EQUIVALENCE = X.XB
XE0068DT
XECOM/11
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 product. No other circuits, patents, or licenses are implied.
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 © 1994
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
Xecom Incorporated
374 Turquoise Street, Milpitas, CA 95035
Ph:408 -945 -66 40 Fax: 408 - 942-1346