HT9200B View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT9200B' PDF : 13 Pages View PDF
HT9200A/HT9200B
For the HT9200B, the S/P pin has to be connected low for
serial mode operation.
Parallel Mode (HT9200B)
The HT9200B provides four data inputs D0~D3 to gener-
ate 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 fall-
ing 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 in-
put pins should not float.
S /P
X2
( O s c illa to r )
tU P
CE
C LK
D ATA
LS B
M S B LS B
M SB
D ig it 1
D ig it 2
LS B
M SB
11111
S to p c o d e
D TM F
D ig it 1
D T M F s ig n a l
Figure 1
D ig it 2
D T M F s ig n a l
Table 2: Digits vs. Input Data vs. Tone Output Frequency (Parallel Mode)
Digit
D3
D2
D1
D0
1
0
0
0
1
2
0
0
1
0
3
0
0
1
1
4
0
1
0
0
5
0
1
0
1
6
0
1
1
0
7
0
1
1
1
8
1
0
0
0
9
1
0
0
1
0
1
0
1
0
*
1
0
1
1
#
1
1
0
0
A
1
1
0
1
B
1
1
1
0
C
1
1
1
1
D
0
0
0
0
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
Rev. 1.40
6
August 30, 2004
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