HT93214 データシートの表示（PDF） - Holtek Semiconductor
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HT93214 Datasheet PDF : 16 Pages
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HT93214 Series
Functional Description
Keyboard matrix
C1~C3, HKS and R1~R4 form a keyboard matrix. To-
gether with a standard 4´4 keyboard, the keyboard
matrix is used for dialing entries. The keyboard ar-
rangement of the HT93214 series is shown in the Key-
board Information.
Tone frequency
Tone
Name
Output Frequency (Hz)
Specified
Actual
R1
697
699
R2
770
766
R3
852
847
R4
941
948
C1
1209
1215
C2
1336
1332
C3
1477
1472
% Error
+0.29%
-0.52%
-0.59%
+0.74%
+0.50%
-0.30%
-0.34%
Note: % Error does not contain the crystal frequency
drift
Dialing specification selection
· The specifications are selected by the MODE pin.
MODE Tone/Pulse Dial Rate M/B Ratio
VDD
Pulse
10pps
1/2
VSS
Tone
¾
¾
Floating
Pulse
20pps
1/2
· The MODE pin status is checked whenever a digit key
is pressed, however the M/B and pulse rate are deter-
mined at the first key entry.
Hand-free function operation
· When HFO is low, a falling edge triggers the HFI, en-
abling the Hand-free function (HFO becomes high).
· Reset Hand-free function
When HFO is high, the Hand-free function is enabled
and can be reset by:
¨ Off-hook
¨ Applying a falling edge to HFI
· Hand-free function table
Current State
Hook SW HFO
¾
Low
On-hook High
Off-hook High
On-hook ¾
Off-hook
Off-hook
Low
High
Next State
Input HFO Dialing?
HFI ¯ High
Yes
HFI ¯ Low
No
HFI ¯ Low
Yes
of
off-hook
Low
Yes
on-hook Low
No
on-hook High
Yes
Flash
Two flash keys are provided, namely F1, F2 for both se-
ries. All the flash key function as control key with differ-
ent break duration. Whenever a flash key is pressed the
PO pin will be forced low for a TF duration and the trans-
mission of the new digit key inputs will be further de-
layed for a TFP after TF. See the following table for flash
duration selection.
Item
F1
F2
HT93214
300ms
600ms
Key definition
· 0,1,2,3,4,5,6,7,8,9 keys
These are dialing number input keys for both the
pulse mode and the tone mode operation.
· */T
This key executes the P®T function and waits a TP®T
duration in the pulse mode. On the other hand, the */T
key executes the * function in the tone mode. The */T
key will occupy one memory digit in either tone or
pulse mode.
·#
This is a dialing signal key for the tone mode only, no
response in the pulse mode.
· F1, F2
Pressing one of the flash keys will force the PO pin to
become low for the TF duration. To transmit the dial
signals of the key input that are entered after the F
key, a wait period TFP (sec) after PO pin returns from
low is provided.
·P
Pause key. The execution of this key pauses the out-
put for the TP duration (2.2s).
·R
Redial key. It executes redialing as well as one-key re-
dial function.
Rev. 1.10
6
October 2, 2002
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