W91620 Datasheet, PDF (2/16 Pages) Winbond – 10-MEMORY TONE/PULSE DIALER WITH TWO-STAGE REDIAL FUNCTION

PIN CONFIGURATION
W91620 SERIES
C1
1
C2
2
C3
3
C4
4
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/C5
10
HKS
PIN DESCRIPTION
SYMBOL PIN NO. I/O
FUNCTION
Column-
Row Inputs
1−4
&
15−18
I Keyboard inputs are designed for use with either a standard 4 × 5
keyboard or an inexpensive single contact (Form A) keyboard.
Electronic input from a µC can also be used.
Valid key entry is defined by a connection between a single row and
a single column.
XT, XT
7, 8 I, O A built-in inverter provides oscillation with an inexpensive
3.579545 MHz crystal or ceramic resonator.
T/P MUTE
9
MODE
13
O _{The T/P MUTE is a conventional CMOS inverter output. It is low}
during pulse and tone mode dialing sequence and flash break;
otherwise, it remains high.
I Mode pin.
Pull to VSS: Tone mode
Pull to VDD or leave floating: Pulse mode (10 ppS, M/B = 2:3 or 1:2)
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