HT9200A 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT9200A Datasheet PDF : 14 Pages
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HT9200A/HT9200B
Functional Description
The HT9200A/B are DTMF generators for MCU inter-
faces. They are controlled by a MCU 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.
When the system is operating in the serial mode a
pull-high resistor is attached to D0~D3 (for parallel
mode) on the input terminal.
Table 1: Digits vs. Input Data vs. Tone Output Frequency (Serial Mode)
Digit
D4
D3
D2
D1
1
0
0
0
0
2
0
0
0
1
3
0
0
0
1
4
0
0
1
0
5
0
0
1
0
6
0
0
1
1
7
0
0
1
1
8
0
1
0
0
9
0
1
0
0
0
0
1
0
1
*
0
1
0
1
#
0
1
1
0
A
0
1
1
0
B
0
1
1
1
C
0
1
1
1
D
0
0
0
0
¾
1
0
0
0
¾
1
0
0
0
¾
1
0
0
1
¾
1
0
0
1
¾
1
0
1
0
¾
1
0
1
0
¾
1
0
1
1
¾
1
0
1
1
DTMF OFF
1
1
1
1
Note: The codes not listed in Table 1 are not used D4 is MSB
D0
Tone Output
Frequency (Hz)
1
697+1209
0
697+1336
1
697+1477
0
770+1209
1
770+1336
0
770+1477
1
852+1209
0
852+1336
1
852+1477
0
941+1336
1
941+1209
0
941+1477
1
697+1633
0
770+1633
1
852+1633
0
941+1633
0
697
1
770
0
852
1
941
0
1209
1
1336
0
1477
1
1633
1
¾
Rev. 1.40
5
August 30, 2004
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