W91410 SERIES
PIN CONFIGURATION
C1
C2
C3
C4
B/M
V
SS
XT
XT
T/P MUTE
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
R4
R3
R2
R1
V
DD
MODE
DTMF
DP
HKS
PIN DESCRIPTION
SYMBOL
Column-
Row Inputs
PIN
1−4
&
15−18
7, 8
9
I/O
I
FUNCTION
The keyboard input may be from either the standard 4
×
4 keyboard
or an inexpensive single contact (form A) keyboard. Electronic
input from a
µC
can also be used. A valid key entry is defined as a
single row being connected to a single column.
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 pulse and tone
mode dialing sequence and flash break. Otherwise, it is switched
off.
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).
Leaving mode pin floating places the dialer in pulse mode (20 ppS).
Hook switch input.
HKS = 1: On-hook state. Chip in sleeping mode, no operation.
HKS = 0: Off-hook state. Chip enabled for normal operation.
The HKS pin is pulled to V
DD
by an internal resistor.
XT, XT
T/P MUTE
I, O
O
MODE
13
I
HKS
10
I
-2-
WINBOND [ WINBOND ]
