W91320N SERIES
PIN DESCRIPTION
SYMBOL
Column-
Row
Inputs
18-PIN
1−4
&
15−18
20-PIN
1−4
&
17−20
22-PIN
1−4
&
19−22
I
I/O
FUNCTION
The keyboard inputs may be used with
either the standard 5
×
5 keyboard or
the inexpensive single contact (Form A)
keyboard. Electronic input from a
µC
can also be used.
A valid key-in is defined as a single row
being connected to a single column
XT, XT
7, 8
7, 8
(8, 9,
W91320LN
only)
8, 9
I, O
A built-in inverter provides oscillation
with an inexpensive 3.579545 MHz
crystal or ceramic resonator.
The T/P MUTE is a conventional
CMOS N-channel open drain output.
The output transistor is switched on
during dialing sequence, one-key redial
break and flash break time. Otherwise,
it is switched off.
T/P
MUTE
9
9
(10,
W91320LN
only)
10
O
MODE
13
15
(14,
W91320LN
only)
16
I
Pulling mode pin to V
SS
places the
dialer in tone mode.
Pulling mode pin to V
DD
places the
dialer in pulse mode. (10 ppS; 20 ppS
for W91321N/321AN M/B = 40:60)
Floating mode pin places the dialer in
pulse mode. (10 ppS; 20 ppS for
W91321N/321AN M/B = 33.3:66.7)
HKS
10
12
(11,
W91320LN
only)
13
I
Hook switch input.
HKS = V
DD
: On-hook state. Chip in
sleeping mode, no operation.
HKS = V
SS
: Off-hook state. Chip is
enable for normal operation.
HKS pin is pulled to V
DD
by internal
resistor.
-3-
Publication Release Date: May 1997
Revision A2
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