W91412 Datasheet PDF - Winbond


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W91412
Winbond

Part Number W91412
Description TONE/PULSE DIALER
Page 12 Pages

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W91410 SERIES
TONE/PULSE DIALER WITH
SAVE FUNCTION
GENERAL DESCRIPTION
The W91410 series are monolithic ICs that provide the necessary signals for either pulse or tone
dialing. The W91410 series feature a redial and save memory.
FEATURES
DTMF/Pulse switchable dialer
Two by 32 digits for redial and save memory
Pulse-to-tone (PT) keypad for long distance call operation
Break/Make ratio is selectable by pin option
Uses 4 × 4 keyboard
Easy operation with redial, flash, pause, and PT keypads
Flash, pause, PT (Pulse-to-tone) can be stored as a digit in memory
Minimum tone output duration: 100 mS
Minimum intertone pause: 100 mS
On-chip power-on reset
Uses 3.579545 MHz crystal or ceramic resonator
Packaged in 18-pin plastic DIP
The different dialers in the W91410 series are shown in the following table:
TYPE NO.
PULSE (ppS)
FLASH (mS)
FLASH PAUSE (mS)
W91412/A
W91414/A
W91416
10/20
10/20
10/20
600/300
73/100
600
600/300
140/100
600
PAUSE (S)
2.0
3.6
3.6
Publication Release Date: January 1995
- 1 - Revision A3



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PIN CONFIGURATION
W91410 SERIES
C1
C2
C3
C4
B/M
VSS
XT
XT
T/P MUTE
1
2
3
4
5
6
7
8
9
18 R4
17 R3
16 R2
15 R1
14 VDD
13 MODE
12 DTMF
11 DP
10 HKS
PIN DESCRIPTION
SYMBOL
PIN
Column-
Row Inputs
14
&
1518
XT, XT
7, 8
T/P MUTE
9
MODE
HKS
13
10
I/O FUNCTION
I 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.
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.
I Pulling mode pin to VSS places the dialer in tone mode. Pulling
mode pin to VDD places the dialer in pulse mode (10 ppS).
Leaving mode pin floating places the dialer in pulse mode (20 ppS).
I 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 VDD by an internal resistor.
-2-



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W91410 SERIES
Pin Description, continued
SYMBOL
PIN
DP 11
DTMF
12
I/O FUNCTION
O N-channel open drain dialing pulse output (Figure 1). Flash key will
cause DP to go active in both pulse and tone mode.
O In pulse mode, remains in low state at all times. In tone mode,
outputs a dual or single tone. Detailed timing diagram for tone
mode is shown in Figure 2(a, b).
OUTPUT FREQUENCY
Specified
Actual
Error %
R1 697 699 +0.28
R2 770 766 -0.52
R3 852 848 -0.47
R4 941 948 +0.74
C1
1209
1216
+0.57
C2
1336
1332
-0.30
C3
1477
1472
-0.34
VDD, VSS
B/M
14, 6
5
I Power input pins.
I The break make ratio is 60:40 if B/M = 1 and is 66.6:33.3 if B/M =
0. This pin has no function in DTMF mode.
Publication Release Date: January 1995
- 3 - Revision A3



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BLOCK DIAGRAM
W91410 SERIES
HKS
B/M
MODE
XT XT
SYSTEM CLOCK
GENERATION
ROW
(R1 to R4)
KEYBOARD
INTERFACE
READ/WRITE
COUNTER
RAM
COLUMN
(C1 to C4)
LOCATION
LATCH
CONTROL
LOGIC
PULSE
CONTROL
LOGIC
T/P MUTE
DP
DTMF
D/A
CONVERTER
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
FUNCTIONAL DESCRIPTION
Keyboard Operation
C1
1
4
7
*
C2
2
5
8
0
F: Flash key
R/P: Redial and pause function key
PT: Pulse mode to tone mode
SAVE: Save memory key
C3 C4
3 SAVE R1
6 F R2
9 PT R3
# R/P R4
-4-




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