TEA7092 datasheet(49/57 Pages) STMICROELECTRONICS

49 / 57 page

SET (V)

5V max.

L (V)

Code (0 0101 01) Sent

Pulse DialingMode

Other Modes

Flash Other Modes

DP (

µP Output)

Figure 65 : Mask / No Mask Mode

V - DIALER FEATURES (continued)

V.2 - Sinewave Generator

The Sinewave generator is programmable like the

DTMF generator. This one generates the DTMF

frequencies divided by 2, in single tone mode in two

groups :

- CodeDTMF + code 0011101: 348,385,426, 470Hz

- CodeDTMF + code 0011110: 604,668, 738, 816Hz

The sinewave level on line is 8dB lower than the

DTMF dialing level.

This sinewave generator can be used in mute

mode to send on line a signal to advise the other

party than you are in Secret mode.

V.3 - Pulse Dialer Interface

In pulse dialing mode, if the code (0 0 1 0 1 0 1) is

used, the voltage across TEA7092 is reduced to 2V

on Pin VL (Pin 3), this way it is possible to achieve

a low voltage across the telephone set during the

make period of the pulse dialing sequence.

Figure 65 shows the DC voltage across TEA7092

and across the telephone set in pulse dialing mode.

Note : It is possible to generate an acoustic control

in the earphone in pulse dialing mode with the

code (0010101). This code should be sent twice

within the break period of the pulse dialing. For ex-

ample, if the break period is 60ms, send the code

(0010101) 10ms after the start of the break period

and send it again 10ms before the end of the break

period. This will generate a DC level change in the

earphone which will be audible.

TEA7092 - TELEPHONE SET INTEGRATED CIRCUIT

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