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SC9200 Datasheet(PDF) 5 Page - Silan Microelectronics Joint-stock |
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SC9200 Datasheet(HTML) 5 Page - Silan Microelectronics Joint-stock |
5 / 9 page SC9200 HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:2.0 2004.08.03 Http: www.silan.com.cn Page 5 of 10 Figure 1 2. Parallel mode (SC9200B/BS) The SC9200B/BS provides four data inputs D0~D3 to generate their corresponding DTMF signals. The /P S has to be connected high to select the parallel operation mode. Then the input data codes should be determined. Finally, the CE is connected low to transmit the DTMF signal from the DTMF pin. The TDE time (about 6ms) will be delayed from the CE falling edge to the DTMF signal output. The relationship between the digital codes and the tone output frequency is illustrated in Table 2. As for the control timing diagram, see Fiigure 2. When the system is operating in the parallel mode, D0~D3 are all in the floating state. Thus, these data input pins should not float. Table 2: Digits vs. input data vs. tone output frequency (parallel mode) Digit D3 D2 D1 D0 Tone Output Frequency 1 0 0 0 1 697+1209 2 0 0 1 0 697+1336 3 0 0 1 1 697+1477 4 0 1 0 0 770+1209 5 0 1 0 1 770+1336 6 0 1 1 0 770+1477 7 0 1 1 1 852+1209 8 1 0 0 0 852+1336 9 1 0 0 1 852+1477 0 1 0 1 0 941+1336 * 1 0 1 1 941+1209 # 1 1 0 0 941+1477 A 1 1 0 1 697+1633 B 1 1 1 0 770+1633 C 1 1 1 1 852+1633 D 0 0 0 0 941+1633 |
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