TEA7092 ST Microelectronics, Inc., TEA7092 Datasheet - Page 17

• Manufacturer Part Number: TEA7092
• Description: Telephone Analog Front End
• Manufacturer: ST Microelectronics, Inc.

MICROCONTROLLER INTERFACE (continued)
Programmable Divider for Ring Frequencies
If requested, the high frequencies corresponding to n varied between 1 to 15 or Divider codes 100XXXX
are accessible.
Operating Modes
TheTEA7092 can work in 1 of the 3 modes :
- Handset,
- Group listening,
- Handsfree.
In each mode the operating codes determine the
operations held by the circuit as soon as this code
is received :
For instance DTMF dialing begins as soon as the
dialing code is received.
The configuration codes operate in each mode of
operation : for instance if the No AGC code is sent,
the AGC inhibition will work in the 3 modes : Hand-
set, Group listening and Handsfree.
DTMF Dialing
To dial in DTMF the following code sequence is sent :
- DTMF : 000XXXX.
- Dialing code : 0010001.
- Mute or SPEECH code : 0010010 or 0010000
The duration of the DTMF signal is fixed by the
1010000
1010001
1010010
1010011
1010100
1010101
1010110
1010111
1011000
1011001
1011010
1011011
1011100
1011101
1011110
1011111
1100000
1100001
1100010
1100011
1100100
1100101
1100110
1100111
Divider
Codes
(to end DTMF mode).
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
n
000XX10
* 877.4
1548.3
1462.3
1385.3
1253.4
1196.4
1144.4
1096.7
1052.8
1012.3
26321
974.8
907.6
849.1
822.5
797.6
774.1
731.1
711.4
692.7
674.9
1645
1316
940
752
Fi codes (Hz) / * Notes (Hz)
000XX11
Ring Frequencies
1471.9
1385.3
1308.4
1239.5
1177.5
1121.5
1070.5
* 619.8
23551
981.3
905.8
872.3
841.1
812.1
759.7
713.7
692.7
672.9
654.2
636.5
603.9
* 785
* 736
1024
942
000XX00
1331.7
1253.4
1183.8
1121.5
1065.4
1014.7
21308
968.5
926.4
887.8
852.3
819.5
789.2
734.8
710.3
687.3
665.9
645.7
626.7
608.8
591.9
575.9
560.7
546.4
761
000XX01
* 694.8
* 555.9
1215.9
1144.4
1080.8
1023.9
19455
972.7
926.4
884.3
845.9
810.6
778.2
748.3
720.6
670.9
648.5
627.6
589.5
572.2
540.4
525.8
498.8
608
512
1101000
1101001
1101010
1101011
1101100
1101101
1101110
1101111
1110000
1110001
1110010
1110011
1110100
1110101
1110110
1110111
1111000
1111001
1111010
1111011
1111100
1111101
1111110
1111111
Divider
Codes
duration between DIALING code and MUTE or
SPEECH code
Note : DTMF code automatically mutes the microphone.
Sine Wave Codes
To generate a melody the following sequence of
codes is sent :
- Frequency code : 000XXXX.
- SINE WAVE code : 0011101 or 0011110 (low or
- SPEECH code : 0010000 (to end SINE WAVE mode).
The duration of the melody is being set by the
duration between SINE WAVE code and SPEECH
code.
Note : SINE WAVE code automatically mutes the microphone.
PULSE Dialing
The pulse dialing function is performed by the
microcontroller through the high voltage stage.
The voltage over the TEA7092 during dialing can
be reduced by sending the MASK code 0010101.
To recover the normal speech voltage at the end of
dialing the mask code must be sent again.
high frequency).
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
n
000XX10
* 438.7
26321
626.7
612.1
598.2
584.9
572.2
548.3
537.2
526.4
516.1
506.2
496.6
487.4
478.6
461.8
453.8
446.1
431.5
424.5
417.8
* 658
642
560
470
Fi codes (Hz) / * Notes (Hz)
000XX11
Ring Frequencies
* 588.8
* 523.4
* 392.5
23551
574.4
560.7
547.7
535.2
501.1
490.6
480.6
461.8
452.9
444.4
436.1
428.2
420.5
413.2
399.2
386.1
379.8
373.8
512
471
406
000XX00
* 495.5
* 463.2
* 367.4
* 349.3
21308
532.7
519.7
507.3
484.3
473.5
453.4
443.9
434.9
426.2
417.8
409.8
394.6
387.4
380.5
373.8
361.1
355.1
343.7
338.2
402
TEA7092
000XX01
* 413.9
* 329.7
19455
486.4
474.5
463.2
452.4
442.2
432.3
422.9
405.3
389.1
381.5
374.1
367.1
360.3
353.7
347.4
341.3
335.4
324.2
318.9
313.8
308.8
397
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