XE0068DT(1999) View Datasheet(PDF) - Xecom

Part Name

Description

Manufacturer

XE0068DT
(Rev.:1999)

FCC Registered DAA Module with DTMF Transmitter/Decoder

Xecom 

XE0068DT Pin Descriptions

PIN NAME I/0 DESCRIPTION

1 VCC

2-5 D0-D3

6 WR

7 RD

8 CS

9 RS0

13 D/V

14 GND

15 CP

16 ESt

17 St/GT

18 XMIT

19 RCVR

21 OH

22 RI

24 Ring

26 Tip

--- +5 Volts

I/O These singals represent the 4-bit data bus which carries the DTMF information per

the chart below.

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.

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.

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

I This input selects the register to be used. A low selects the data register.

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.

--- Ground

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 repre-

sentation of the call progress signal on the phone line.

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

signal causes ESt to go low.

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.

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.

O Analog output signal from the 2-4 wire converter, the output impedence of RCVR

is typically 10 ohms at 1800 hz.

I Hookswitch control. A high closes the internal relay to connect the equipment to

the phone line.

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

nal.

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

--- Tip Connection to the phone line (RJ11 Pin 3)

XECOM

(4)

XE0068DT

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