LSI Computer Systems ASOT
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.| Part No. | ASOT |
|---|---|
| Datasheet | ASOT Download |
| Manufacturer |  LSI Computer Systems |
| Description | 8-Pin Automatic Shut Off Timers |
| Buy | Stock & Price |
FEATURES
:● Minimizes external components and power consumption
● Factory calibrated timer
● Mask programmable from 2.5 minutes to 32 hours
APPLICATIONS
Control of household appliances, heaters, lighting and AC motors.DESCRIPTION
The basic 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 output 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.