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HT9201B Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

Part # HT9201B
Description  Simple Tone Dialer
PDF  7 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT9201B Datasheet(HTML) 5 Page - Holtek Semiconductor Inc

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Timing Diagrams
Functional Description
Keyboard matrix
C1~C4 and R1~R4 form a keyboard matrix. The
keyboard arrangement for each of the HT9201
series are shown in the Keyboard Information.
Tone frequency
Tone
Name
Output
Frequency (Hz)
% Error
Specified
Actual
R1
697
699
+0.29%
R2
770
766
–0.52%
R3
852
847
–0.59%
R4
941
948
+0.74%
C1
1209
1215
+0.50%
C2
1336
1332
–0.30%
C3
1477
1472
–0.34%
C4
1633
1645
+0.73%
Note: % Error does not contain the crystal frequency
drift
Key definition
• 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ∗, #, A, B, C, D keys
These are the dialing number input keys for
normal operation.
• F1, F2, F3, F4
The flash keys can be selected with different
flash times as shown in the following table.
Flash time selection table
Key
Flash Time (ms)
F1
600
F2
300
F3
200
F4
90
Keyboard operation
HT9201A/B
5
3rd Dec ’97



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