Cermetek DataSheet for product XE0068DTRevC

XE0068DT

August 2005

FCC Registered DAA Module with DTMF Transmitter/Decoder

Description

Features

The XE0068DT is an FCC registered telephone line

Small Size - 2.28" x 1.08" x 0.42"

interface which includes a DTMF transmitter, DTMF

User Transferrable FCC Part 68 Registration

decoder and call progress monitor.

Integrated Ring Detection Circuit.

FCC rules limit the signal level that equipment can place

Solid-State Hookswitch Control

on the telephone line. The XE0068DT incorporates an

Automatic Gain Control (AGC) circuit to control the

Provides 1500 Volt Isolation between the tele-

phone line and all other circuits

output signal level. The AGC optomizes the output

levele over a wide variety of input levels without

Includes supplemental surge protection to survive

introducing signal distortion.

both FCC Type A and Type B surges.

FCC rules also dictate a 2-second delay at the start of

Integral 2-Second Billing Delay (required for FCC

Part 68 registration)

each call.

This billing delay prevents information

transmission during the billing period. The XE0068DT

Automatic Gain Control optimizes transmit level

includes this billing delay.

for most any input level.

The integrated DTMF transceiver, call progress monitor

Integral DTMF transmitter and decoder

and FCC registration make the XE0068DT ideal for

Call Progress Monitoring

network signalling applications.

XE0068DT Block Diagram

XE0068DT Pin Configuration

VCC o 1

26 o Tip

DTMF

D3 o 2

Transmitter

Tip

D2 o 3

24 o Ring

ESt

& Receiver

/RD

Ring

D1 o 4

/WR

D0 o 5

22 o /RI

/CS

/WR o 6

21 o OH

RS0

Line

Hook Switch

Transformer

/RD o 7

20 o N/C

St/GT

/CS o 8

19 o RCVR

RS0 o 9

18 o XMIT

2-4 Wire

Ring

N/C o 10

17 o St/GT

RCVR

Convertor

Detect

N/C o 11

16 o ESt

N/C o 12

15 o CP

/RI

D/V o 13

14 o GND

XMIT

AGC

Billing Delay

D/V

Timer

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XE0068DT

XE0068DT Mechanical Specifications

Inches

Metric(MM)

Dim

Min

Max

Min

Max

2.270

2.290

57.66

58.17

1.065

1.095

27.05

27.81

0.420

0.430

12.32

13.08

0.890

0.910

22.61

23.11

1.190

1.210

30.23

30.73

0.125

0.200

3.18

5.08

0.080

0.100

2.03

2.54

0.530

0.550

13.46

13.97

0.090

0.110

2.29

2.79

Denotes

0.020

0.025

0.51

0.64

Pin 1

K F

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.

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XE0068DT

XE0068DT Typical Connection Diagram

XE0068DT

FB1

+5V

VCC

Tip

FB2

RJ11

Ring

/RI

/WR

/RD

/CS

RCVR

External

Signal

RS0

XMIT

Source

St/GT

374K

ESt

0.1 ufd

3.3K

+5V

D/V

Address

Gnd

Decode

+5V

AD0-AD7

/WR

/RD

A8-A15

ALE

Int0/P3

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

+5 Volts

XE0068DT

0.1 uFd

10K

St/GT

10K

LM339

374K

ESt

10K

150K

1N4148

+5 Volts

0.15 uFd

To IRQ

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XE0068DT

XE0068DT Pin Descriptions

NAME

I/0

DESCRIPTION

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.

/WR

Read and Write determine the direction of DTMF data. A low on /WR with /RD

high allows the processor to write to the XE0068DT.

/RD

Read and Write determine the direction of DTMF data. A low on /RD with /WR

high allows the processor to read from the XE0068DT.

/CS

A low on Chip Select, selects the XE0068 DTMF data bus.

RS0

This input selects the register to be used. A low selects the data register and a high

slects the status or control registers.

D/V

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.

GND

---

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 repre-

sentation of the call progress signal on the phone line.

ESt

Goes high to indicate that a valid tone pair has been detected. A momentary loss of

signal causes ESt to go low.

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.

XMIT

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.

RCVR

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.

/RI

Ring Indicate, output, active low, TTL, indicates the modem is receiving a ring sig-

nal.

Ring

---

Ring connection to the phone line (RJ11 Pin 4).

Tip

---

Tip Connection to the phone line (RJ11 Pin 3)

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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

/WR

/RD

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

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

IRQ

An interrupt has occurred

Interrupt inactive, Cleared

after Status Register Read

Transmit Data Register

Transmitter Ready for

Status has been read or

Empty

New Data

is in non-burst mode

Receive Data Register

Status Register has been

Full

contains valid data

Read

Delayed Steering

Set upon detection

Cleared upon detection of

of the absence of a

a valid DTMF signal

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

Signal

Function

TOUT

Tone Output Control: This bit controls the tone transmit functions. A

high enables the tone output; a low turns tone output off.

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.

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).

RSEL

Control Register B for the next write cycle. After writing to Control

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

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.

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.

S/D

Single or Dual Tone Generation: A logic high sets the XE0068DT to

generate a single tone rather than transmiting two tones.

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

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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 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

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

Read Status Register

Write to Control Register

Read Status Register

* 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 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.

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XE0068DT

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

Parameter

Conditions

Min

Typ

Max

Units

Power Supply Current

Ring Indicate Active

Coupler Match

Output impedance

531

536

541

ohms

AGC Input Range

Maintaining steady output level

-40

dBm

AGC Output Level

D/V held high

-20

-9

dBm

AGC Output Level

D/V held low

-11

dBm

Billing Delay

OH activated

2.0

2.3

seconds

Transhybrid Loss

at 1000 Hz

-34

dBm

Receive Loss

at 1000 Hz

-1.0

1.0

Ring Detect

Min. AC voltage between Tip & Ring

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

Control Current

Loop Current

Off-Hook current draw from

100

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

msec

Tone Frequencies

DTMF Transmission,

697

770

852

941

1209

1336

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XE0068DT

XE0068DT Read/Write Clock Pulse Timing

t cy c

t_r

t f

t_pwl

t_pwh

RD/WR

Signal

Definition

Min

Typ

Max

Units

t_r

Read/WriteRiseTime

nanoseconds

t_f

Read/WriteFallTime

nanoseconds

t_cyc

Read/WriteCycleperiod

250

nanoseconds

t_pwh

Read/Writepulsewidthhigh

100

nanoseconds

t_pwl

Read/Writepulsewidthlow

150

nanoseconds

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XE0068DT

XE0068DT Read Timing

t_pwl

pwh

t_as

t ah

CS/RS0

t_ddr

t dhr

Data Bus

Signal

Definition

Min

Typ

Max

Units

t_as

AddressSetupTime

nanoseconds

t_ah

AddressHoldTime

nanoseconds

t_pwl

ReadPulseWidthLow

150

nanoseconds

t_pwh

ReadPulseWidthHigh

100

nanoseconds

t_ddr

Read toValid Data

100

nanoseconds

t_dhr

DataHoldTime(Read)

nanoseconds

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XE0068DT

XE0068DT Write Timing

t_pwl

pwh

t_as

t ah

CS/RS0

t_dsw

t dhw

Data Bus

Signal

Definition

Min

Typ

Max

Units

t_as

AddressSetupTime

nanoseconds

t_ah

AddressHoldTime

nanoseconds

t_pwl

WritePulseWidthLow

150

nanoseconds

t_pwh

WritePulseWidthHigh

100

nanoseconds

t_dsw

DataSetupTime(Write)

nanoseconds

t_dhw

DataHoldTime(Write )

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

DWEUSA-75283-DP-W

Ringer Equivalence

0.5B

Telephone Jack

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 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.

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 Incorporated

374 Turquoise Street, Milpitas, CA 95035

Ph:408-945-6640 Fax:408-942-1346

Email: info@xecom.com

XECOM

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XE0068DT