HT9200A(1998) 查看數據表（PDF） - Holtek Semiconductor
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HT9200A Datasheet PDF : 8 Pages
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HT9200A/B
Functional Description
The HT9200A/B are DTMF generators for µC
interfaces. They are controlled by a µC in the
serial mode or the parallel mode (for the
HT9200B only).
Serial mode (HT9200A/B)
The HT9200A/B employ a data input, a 5-bit
code, and a synchronous clock to transmit a
DTMF signal. Every digit of a phone number to
be transmitted is selected by a series of inputs
which consist of 5-bit data. Of the 5 bits, the
D0(LSB) is the first received bit. The
HT9200A/B will latch data on the falling edge of
the clock (CLK pin). 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
1
0
0
0
0
1
2
0
0
0
1
0
3
0
0
0
1
1
4
0
0
1
0
0
5
0
0
1
0
1
6
0
0
1
1
0
7
0
0
1
1
1
8
0
1
0
0
0
9
0
1
0
0
1
0
0
1
0
1
0
∗
0
1
0
1
1
#
0
1
1
0
0
A
0
1
1
0
1
B
0
1
1
1
0
C
0
1
1
1
1
D
0
0
0
0
0
—
1
0
0
0
0
—
1
0
0
0
1
—
1
0
0
1
0
—
1
0
0
1
1
—
1
0
1
0
0
—
1
0
1
0
1
—
1
0
1
1
0
—
1
0
1
1
1
DTMF OFF 1
1
1
1
1
Tone Output Frequency (Hz)
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
697
770
852
941
1209
1336
1477
1633
—
*Notes: The codes not listed in Table 1 are not used D4 is MSB
5
21st Aug ’98
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