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

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