W91340N SERIES
PIN CONFIGURATIONS
C1
C1
C2
C3
C4
H/P MUTE
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
C4
R1
H/P MUTE
V
DD
MODE
XT
DTMF
XT
DP
HKS
HFI
T/P MUTE
V
SS
C2
C3
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
R4
R3
R2
R1
V
DD
MODE
DTMF
DP
HKS
HFO
W91340N/342N
W91340AN/342AN/344AN
PIN DESCRIPTION
SYMBOL
Column-
Row Inputs
18-PIN
1−4
&
15−18
20-PIN
1−4
&
17−20
I/O
I
FUNCTION
The keyboard inputs may be used with either a standard
5
×
4 keyboard or an inexpensive single contact (Form A)
keyboard. Electronic input from a
µC
can also be used.
A valid key 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 dialing sequence
and flash break time. 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
with M/B ratio of 40:60 (10 ppS, except for
W91342N/W91342AN = 20 ppS.)
Floating mode pin places the dialer in pulse mode with M/B
ratio of 33.3:66.7 (10 ppS, except for W91342N/W91342AN
= 20 ppS.)
HKS
XT, XT
T/P
MUTE
7, 8
9
7, 8
9
I, O
O
MODE
13
15
I
10
12
I
Hook switch input.
HKS = V
DD
: On-hook state. Chip in sleeping mode, no
operation.
HKS = V
SS
: Off-hook state. Chip is enabled for normal
operation.
HKS pin is pulled to V
DD
by an internal resistor.
-2-
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