W91810N Datasheet, PDF (3/26 Pages) Winbond – 23-MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

W91810N SERIES
PIN DESCRIPTION
SYMBOL 22-PIN 24-PIN 28-PIN I/O
FUNCTION
Column-
Row Inputs
1−5
&
18−22
1−5
&
20−24
1−6
&
23−28
I The keyboard input is compatible with a standard
6 × 6 or 7 × 7 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 a single tone.
XT
9
9
10
I A built-in inverter together with an inexpensive
3.579545 MHz crystal supplies the oscillator. The
oscillator stops when there is no keypad input.
The crystal frequency deviation is 0.02%.
XT
10
10
11 O Crystal oscillator output pin.
T/P MUTE ¹¹
11
12 O _{The T/P MUTE is a conventional CMOS N-}
channel open drain output.
The output transistor turns on with a low level
during a dialing sequence (both pulse and tone
mode). Otherwise, it is off.
K MUTE
17
19
22 O _{The K MUTE is a conventional CMOS N-channel}
open drain output.
Toggle action speech mute control pin by MUTE
key.
MODE
15
17
20
I Connecting the mode pin to VSS places the dialer
in tone mode.
Connecting the mode pin to VDD places the dialer
in pulse mode with an M/B ratio of 40:60.
Leaving the mode pin floating places the dialer in
pulse mode with an M/B ratio of 33.3:66.7.
HKS
12
14
17
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 VDD by internal resistor.
Publication Release Date: March 2000
-3-
Revision A5