SC9200

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:2.0

2004.08.03

Http: www.silan.com.cn

Page 4 of 10

FUNCTIONAL DESCRIPTION

The SC9200 are DTMF generators for

µC interfaces. They are controlled by a µC in the serial mode.

1. Serial mode (SC9200)

The SC9200 employ a data input, a 5-bit code, and a synchronous clock to transmit a DTMF signal. The

relationship between the digital codes and the tone output frequency is shown in Table 1 as for the control timing

diagram, refer to Figure 1.

Table 1: Digits vs. input data vs. tone output frequency (serial mode)

Digit

D4

D3

D2

D1

D0

Tone Output Frequency (Hz)

1

0

0

0

0

1

697+1209

2

0

0

0

1

0

697+1336

3

0

0

0

1

1

697+1477

4

0

0

1

0

0

770+1209

5

0

0

1

0

1

770+1336

6

0

0

1

1

0

770+1477

7

0

0

1

1

1

852+1209

8

0

1

0

0

0

852+1336

9

0

1

0

0

1

852+1477

0

0

1

0

1

0

941+1336

*

0

1

0

1

1

941+1209

#

0

1

1

0

0

941+1477

A

0

1

1

0

1

697+1633

B

0

1

1

1

0

770+1633

C

0

1

1

1

1

852+1633

D

0

0

0

0

0

941+1633

--

1

0

0

0

0

697

--

1

0

0

0

1

770

--

1

0

0

1

0

852

--

1

0

0

1

1

941

--

1

0

1

0

0

1209

--

1

0

1

0

1

1336

--

1

0

1

1

0

1477

--

1

0

1

1

1

1633

DTMF OFF

1

1

1

1

1

--

*Notes: The codes not listed in Table 1 are not used D4 is MSB.