W91320N SERIES
PIN DESCRIPTION
SYMBOL 18-PIN
Column-
Row
Inputs
1−4
&
15−18
20-PIN
1−4
&
17−20
XT, XT
T/P
MUTE
7, 8
9
7, 8
(8, 9,
W91320LN
only)
9
(10,
W91320LN
only)
MODE
13
15
(14,
W91320LN
only)
HKS
10
12
(11,
W91320LN
only)
22-PIN
1−4
&
19−22
8, 9
I/O
FUNCTION
The keyboard inputs may be used with
I 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
I, O A built-in inverter provides oscillation
with an inexpensive 3.579545 MHz
crystal or ceramic resonator.
10
O 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.
16
I Pulling mode pin to VSS places the
dialer in tone mode.
Pulling mode pin to VDD 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)
13
I Hook switch input.
HKS = VDD: On-hook state. Chip in
sleeping mode, no operation.
HKS = VSS: Off-hook state. Chip is
enable for normal operation.
HKS pin is pulled to VDD by internal
resistor.
Publication Release Date: May 1997
-3-
Revision A2