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PDF ASOT Data sheet ( Hoja de datos )
| Número de pieza | ASOT | |
| Descripción | 8-Pin Automatic Shut Off Timers | |
| Fabricantes | LSI Computer Systems | |
| Logotipo |  |
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LSI/CSIwww.datasheet4u.com
ASOT
ASOTR ASOTR1
ASOTT ASOTT1
U® L LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405
A3800
3, 4 AND 8 PIN AUTOMATIC SHUT-OFF TIMERS January 2002
ADVANCE INFORMATION
FEATURES:
DIP/SOIC
• Minimizes external components and power consumption
• Factory calibrated timer
• Mask programmable from 2.5 minutes to 32 hours
ASOTR1
and
V DD 1
GND 2
8 NC
7 NC
ASOTT1 OUT 3
6 NC
APPLICATIONS
Control of household appliances, heaters, lighting and AC motors.
IN 4
5 DUTY CYCLE IN
DESCRIPTION
The basic ASOT is a CMOS integrated circuit timer that can
be mask programmed from 2.5 minutes to 32 hours as shown in
Table 1. The output of the IC is used to turn on a 12V relay and
has a duty cycle which can be mask programmed from 5% to
37.5% in 2.5% steps as shown in Table 2. The duty cycle can
be selected to optimize operation for a particular relay coil.
There are 5 different versions of the IC.
The ASOT is a 3-Pin version housed in a TO-92 package. The
application schematic is shown in Figure 2. When latching
switch S1 is closed, the output turns on energizing relay L1 and
keeping switch S1 closed. When the programmed time-out
expires, the output turns off deenergizing relay L1 and causing
switch S1 to open.
The ASOTR is a 4-Pin version as shown in Figure 3. The out-
put turns on in the same manner as in the 3-Pin version. If
momentary switch S2 is closed, the timer resets and starts
timing out again. The S2 input has an internal pull-up resistor.
Every subsequent momentary switch closure resets the timer.
As in the 3-Pin version, the output remains on until the timeout
expires.
The ASOTT is also a 4-Pin version as shown in Figure 4. In
this version contacts C1 replace switch S1 and are not
accessible. The application of power caused by closing
TO-92
8-PIN VERSION
SIP
V DD GND OUT
IN
ASOT
ASOTR
and
12
34
ASOTT
V DD
GND
OUT
4-PIN VERSION
3-PIN VERSION
FIGURE 1. PACKAGE OPTIONS
the momentary switch S2 causes the output to toggle on as in
the 3-Pin version. If the momentary switch is closed again,
the output toggles off causing contact C1 to open and power
to be removed. The R2 input has an internal pull-up resistor.
The default operaton of the output produces a double duty
cycle for the first 10 milliseconds of output activation to
increase the pull-in torque of the relay. The option to remove
this feature is factory selectable in the ASOT (3-Pin), ASOTR
(4-Pin) and ASOTT (4-Pin) versions. There are also two 8-Pin
versions available which allow the user to change this feature.
The ASOTR1 is the 8-Pin version used in the Figure 3
application and the ASOTT1 is the 8-Pin version used in the
Figure 4 application. In both cases, the duty cycle input has
an internal pull-up resistor. Tying the input to Vss removes
the double duty cycle feature.
TABLE 1 Timeout
Numbers
01 - 10
11 - 20
21 - 30
31 - 40
41 - 50
Auto Shut-Off Times
0h 0h 0h
2.5m 5m 7.5m
0h
10m
0h
30m
0h 0h
0h
35m 37.5m 40m
1h
20m
1h 1h
30m 40m
1h
45m
3h
30m
4h 4h
0m 40m
5h
0m
9h
20m
10h 10h
0m 40m
12h
0m
0h 0h 0h 0h
12.5m 15m 17.5m 20m
0h
45m
0h 0h
1h
50m 52.5m 0m
2h 2h 2h 2h
0m 20m 30m 40m
5h
20m
6h 6h
0m 40m
7h
0m
14h 16h 20h 24h
0m 0m 0m 0m
0h 0h
22.5m 25m
1h
10m
1h
15m
3h 3h
0m 20m
8h 9h
0m 0m
28h 32h
0m 0m
TABLE 2 Duty Cycle Numbers
01 - 07
08 - 14
7214-011702-1
Duty Cycle Percentages
5 7.5 10 12.5
22.5 25
27.5 30
15 17.5
32.5 35
20
37.5
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet ASOT.PDF ] | |
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