W91530N SERIES
PIN DESCRIPTION
SYMBOL
Column-
Row Inputs
18-PIN
1−4
&
15−18
20-PIN
1−4
&
17−20
I/O
I
FUNCTION
The keyboard input is compatible with a standard 5 x 5
keyboard, an inexpensive single contact (Form A)
keyboard, and electronic input.
In normal operation, any single button can be pushed to
produce dual tone, pulses, or functions. Activation of two or
more buttons will result in no response except for single
tone.
XT
7
7
I
A built-in inverter provides oscillation with an inexpensive
3.579545 MHz crystal. The oscillator ceases when a
keypad input is not sensed. The crystal frequency deviation
is 0.02%.
Crystal oscillator output pin.
The T/P MUTE is a conventional CMOS N-channel open
drain output.
The output transistor is switched on low level during dialing
sequence (both pulse and tone mode). Otherwise, it is
switched off.
MODE
13
15
I
Pulling mode pin to V
SS
places dialer in tone mode.
Pulling mode pin to V
DD
places dialer in pulse mode (10
ppS) with M/B ratio of 40:60 (W91532/532AN is 20 ppS).
Leaving mode pin floating places dialer in pulse mode (10
ppS) with M/B ratio of 33.3:66.7 (W91532/532AN is 20
ppS).
HKS
10
12
I
The HKS (hook switch) input is used to sense whether the
handset is on-hook or off-hook.
In on-hook state, HKS = 1: chip is in sleeping mode, no
operation.
In off-hook state, HKS = 0: chip is enabled for normal
operation.
HKS pin is pulled to V
DD
by internal resistor.
KT
5
5
O
(except
(except
W91531LN) W91531ALN)
XT
T/P MUTE
8
9
8
9
O
O
The key tone output is a conventional CMOS inverter. The
key tone is generated when any valid key is pressed; the
KT pin generates a 1.2 KHz square wave at 35 mS. When
no key is pressed, the KT pin remains in low state.
-3-
Publication Release Date: May 1997
Revision A3
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