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SC9200AS

DTMF GENERATOR WITH MICRO-PROCESSOR INTERFACE

Silan Microelectronics 

SC9200

Figure 1

2. Parallel mode (SC9200B/BS)

The SC9200B/BS provides four data inputs D0~D3 to generate their corresponding DTMF signals. The S/P

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

1

0

0

0

1

2

0

0

1

0

3

0

0

1

1

4

0

1

0

0

5

0

1

0

1

6

0

1

1

0

7

0

1

1

1

8

1

0

0

0

9

1

0

0

1

0

1

0

1

0

*

1

0

1

1

#

1

1

0

0

A

1

1

0

1

B

1

1

1

0

C

1

1

1

1

D

0

0

0

0

Tone Output Frequency

697+1209

697+1336

697+1477

770+1209

770+1336

770+1477

852+1209

852+1336

852+1477

941+1336

941+1209

941+1477

697+1633

770+1633

852+1633

941+1633

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

Http: www.silan.com.cn

REV:2.0 2004.08.03

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