HT9320
Symbol
THD
T
TMIN
T
ITPM
Parameter
Tone Signal Distortion
Minimum Tone Duration
Minimum Inter-tone Pause
Test Conditions
V
DD
¾
¾
Conditions
Auto-redial
Auto-redial
2.5V R
L
=5kW
Min.
¾
¾
¾
Typ.
-30
82.5
85.5
Max.
-23
¾
¾
Unit
dB
ms
ms
THD (Distortion) (dB) = 20 log ( V1
2
+
V2
2
+
K
Vn
2
/ Vi
2
+
Vh
2
)
Vi, Vh: Row group and column group signals
V1, V2, ... Vn: Harmonic signals (BW=300Hz~3500Hz)
Functional Description
Keyboard matrix
C1~C8 and R1~R5 form a keyboard matrix. To-
gether with a standard 5´8 keyboard, the key-
board matrix is used for dialing entries. In
addition, the keyboard matrix also provides resis-
tor options for different dialing specification se-
lections. The keyboard arrangement for the
HT9320 series are shown in the
Keyboard In-
formation.
Tone frequency
Tone
Name
R2
R3
R4
R5
C1
C2
C3
Output
Frequency (Hz)
Specified
697
770
852
941
1209
1336
1477
Actual
699
766
847
948
1215
1332
1472
+0.29%
-0.52%
-0.59%
+0.74%
+0.50%
-0.30%
-0.34%
% Error
R 1
R 2
R 3
R 4
R
R
R
K 1 2
K 1 3
K 1 4
C 1
C 2
R
C 3
R
C 4
R
C 5
R
C 6
R
C 7
R
K 2 1
K 3 1
K 4 1
K 5 1
K 6 1
K 7 1
All the resistors are 330kW. The resistor option
functions and the default specifications (with-
outoptionresistors)arelistedbelow(HT9320A/
B/C/K/L).
Option
Resistor
Option
Function
Default
(No Resistor)
40:60
R
K12
(HT9320B/ Ratio Selection
C/K/L)
R
K13
R
K14
Flash= control
Flash Function
function
/Time Selection Flash time=
600ms
Pause & P®T
Duration
Selection
Pulse Number
Selection
T
P
= 3.6s
T
P®T
= 3.6s
N
Note: %Errordoesnotcontainthecrystalfrequency
drift
Dialing specification selection
Various dialing specifications can be selected by
adding resistors across keyboard matrix pins.
The allowable option resistor connections are
shown on the table.
11
R
K21
R
K31
R
K41
R
K51
Inter-digit-
(HT9320A Pause Time for
/B/C/K)
10pps
800ms
July 21, 1999
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
