W91580 Datasheet, PDF (2/19 Pages) Winbond – 24-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND HOLD FUNCTIONS

W91580 SERIES
PIN CONFIGURATIONS
C1 1
C2 2
C3 3
C4 4
C5 5
C6 6
C7 7
VSS 8
XT
9
XT
10
T/P MUTE
11
22
R5
21
R4
20
R3
19
R2
18
R1
17
NC
16
VDD
15
MODE
14
DTMF
13
DP/C9
12
HKS
W91580
C1
1
C2
2
C3
3
C4
4
C5
5
C6
6
C7
7
VSS
8
XT
9
XT
10
T/P MUTE
11
HFI
12
24
R5
23
R4
22
R3
21
R2
20
R1
19
NC
18
VDD
17
MODE
16
DTMF
15
DP/C9
14
HKS
13
HFO
W91580A
C1 1
C2 2
C3 3
C4 4
C5 5
C6 6
C7 7
C8 8
KT
9
VSS 10
XT 11
XT 12
T/P MUTE 13
HFI 14
28
R5
27
R4
26
R3
25
R2
24
R1
23
HPM MUTE
22
NC
21
DRS
20
VDD
19
MODE
18
DTMF
17
DP/C9
16
HKS
15
HFO
W91580B/C
PIN DESCRIPTION
SYMBOL 22-PIN 24-PIN
Column-
Row
Inputs
1−7
&
18−22
1−7
&
20−24
XT, XT
9, 10
9, 10
T/P MUTE ¹¹
11
HPM
-
-
MUTE
28-PIN
1−8
&
24−28
11, 12
13
23
I/O
FUNCTION
I The keyboard input may be used with either the
standard 9 × 5 keyboard or an inexpensive
single contact (form A) keyboard. Electronic
input from a µC can also be used.
A valid key entry is defined by a single row
being connected to a single column.
I, O A built-in inverter provides oscillation with an
inexpensive 3.579545 MHz crystal or ceramic
resonator.
O _{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.
O The HPM MUTE is a conventional inverter
output. During pulse dialing, flash, hold, and
mercury mute functions, this pin will output an
active high. It remains in a low state at all other
times.
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