U4091BM Datasheet, PDF (6/29 Pages) TEMIC Semiconductors – Programmable Telephone Audio Processor

U4091BM
READ:
There is a normal and a fast-read cycle.
In the normal read cycle, the microcontroller sends a 4-bit
DTMFF[2:3] Frequency Error / %
address followed by the read indicator, then an 8-bit word
in DTMF
is read out. The U4091BM drives the data line.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{The fast read cycle is indicated by a strobe signal. With}
0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^{the following two clocks the U4091BM reads out the sta-}
1
tus bits RFDO and LIDET which indicate that a ringing
2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{signal or a line signal is present (see figures 4, 5 and 6).}
3
Mode
00
01
10
11
1209
1336
1477
1633
–0.110
0.123
–0.020
–0.182
DTMF Dialing
The DTMF generator sends a multi-frequency signal
through the matrix to the line. The signal is the result of
the sum of two frequencies and is internally filtered. The
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{frequencies are chosen from a low and a high frequency}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ group.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{The circuit conforms to the CEPT recommendation}
DTMFF4 in DTMF mode
Pre-Emphasis Selection
0
2.5 dB
1
3.5 dB
concerning DTMF option.
Two different levels for the low level group and two
different pre-emphasis (2.5 dB and 3.5 dB) can be chosen
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{by means of the serial bus (rec. T/CF 46–03).}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Melody – Confidence Tone Generation}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Melody/confidence tone frequencies are given in the}
table below.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{The frequencies are provided at the DTMF input of the}
switch matrix. A sinus wave, a square wave or a pulsed
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{wave can be selected by the serial bus. Square signal}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{means the output is half of frequency cycle high and half}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^{low. Pulsed signal means between the high and low}
phases are high impedance phases of 1/6 of the period.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _DTMFM[0:2]
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₀
000
DTMF generator OFF
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁
001
Confidence tone melody
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{on (sinus)}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2
010
Ringer melody (pulse)
3
011
Ringer melody
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{(square signal)}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₄
100
DTMF (high level)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₅
101
DTMF (low level)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₆
110
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 7
111
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{DTMFF[0:1] Frequency Error / %}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^{in DTMF}
Mode
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₀
00
697
–0.007
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁
01
770
–0.156
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₂
10
852
0.032
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₃
11
941
0.316
DTMFF
[0:4]
0 00000
1 00001
2 00010
3 00011
4 00100
5 00101
6 00110
7 00111
8 01000
9 01001
10 01010
11 01011
12 01100
13 01101
14 01110
15 01111
16 10000
17 10001
18 10010
19 10011
20 10100
21 10101
22 10110
23 10111
24 11000
25 11001
26 11010
27 11011
28 11100
29 11101
30 11110
31 11111
f
Hz
440.0
466.2
493.9
523.2
554.4
587.3
622.3
659.3
698.5
740.0
784.0
830.0
880.0
932.3
987.8
1046.5
1108.7
1174.7
1244.5
1318.5
1396.9
1480.0
1568.0
1661.2
1760.0
1864.6
1975.5
2093.0
2217.5
2349.3
2663.3
2983.0
Tone-
Name
a¹
b¹
h¹
c²
des²
d²
es²
e²
f²
ges²
g²
as²
a²
b²
h²
c³
des³
d³
es³
e³
f³
ges³
g³
as³
a³
b³
h³
c⁴
des⁴
d⁴
Error/%
–0.008
–0.016
–0.003
0.014
0.018
–0.023
–0.129
0.106
–0.216
–0.222
0.126
–0.169
0.288
–0.014
–0.004
–0.335
–0.355
–0.023
–0.129
0.106
–0.214
–0.222
0.126
–0.241
–0.302
–0.014
0.665
0.367
0.387
0.771
–––
–––
DTMF Key
697 1209 1
770 1209 4
852 1209 7
941 1209 *
697 1336 2
770 1336 5
852 1336 8
941 1336 0
697 1477 3
770 1477 6
852 1477 9
941 1477 #
697 1633 A
770 1633 B
852 1633 C
941 1633 D
697 1209 1
770 1209 4
852 1209 7
941 1209 *
697 1336 2
770 1336 5
852 1336 8
941 1336 0
697 1477 3
770 1477 6
852 1477 9
941 1477 #
697 1633 A
770 1633 B
852 1633 C
941 1633 D
6 (29)
Rev. A1, 02-Jun-98
Target Specification