W91340N Datasheet, PDF (2/15 Pages) Winbond – 10-MEMORY TONE/PULSE DIALER WITH HANDFREE AND HOLD FUNCTION

W91340N SERIES
PIN CONFIGURATIONS
C1 1
C2 2
C3 3
C4 4
H/P MUTE 5
VSS
6
XT 7
XT ⁸
T/P MUTE 9
18 R4
17 R3
16 R2
15 R1
14 VDD
13 MODE
12 DTMF
11 _DP
10 _HKS
W91340N/342N
C1 1
C2 2
C3 3
C4 4
H/P MUTE 5
VSS 6
XT 7
XT 8
T/P MUTE 9
HFI ¹⁰
20 R4
19 R3
18 R2
17 R1
16 VDD
15 MODE
14 DTMF
13 DP
12 _HKS
11 HFO
W91340AN/342AN/344AN
PIN DESCRIPTION
SYMBOL 18-PIN 20-PIN I/O
FUNCTION
Column-
Row Inputs
1−4
&
15−18
1−4
&
17−20
The keyboard inputs may be used with either a standard
I ^{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.
XT, XT
7, 8
7, 8 I, O A built-in inverter provides oscillation with an inexpensive
3.579545 MHz crystal or ceramic resonator.
T/P MUTE
9
9
O _{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.
MODE
13
15
I Pulling mode pin to VSS places the dialer in tone mode.
Pulling mode pin to VDD 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
10
12
I Hook switch input.
HKS = VDD: On-hook state. Chip in sleeping mode, no
operation.
HKS = VSS: Off-hook state. Chip is enabled for normal
operation.
HKS pin is pulled to VDD by an internal resistor.
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