SC9200B 데이터 시트보기 (PDF) - Unspecified

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SC9200B

DTMF GENERATORS

Unspecified 

Silan

Semiconductors

SC9200A/B

S/P

X2

(Oscillator)

tUP

CE

CLK

DATA

DTMF

LSB

MSB LSB

MSB

Digit 1

Digit 2

LSB

MSB

11111

Stop code

Digit 1

DTMF signal

Figure 1

Digit2

DTMF signal

2. Parallel mode (SC9200B)

The SC9200B 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 figure 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.

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

6

2001.02.02

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