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