Description

The LS7217 is a programmable Timer IC designed to turn on a relay at night and turn off the relay at dawn or after a selectable number of hours. Dusk-to-Dawn duration is determined solely by the photo-cell; i.e., the Relay output is on whenever the photocell recognizes an ambient dark condition. Applications include lighting control for outdoor areas, street lighting, parking lot lighting, and billboard lighting.

Features:

• Interface directly to photo-resistor
• Programmable duration selection: 4 hours, 6 hours, 8 hours, dusk-to-dawn
• Shunt regulator
• 50Hz / 60Hz time base selection
• Relay driver output
• 6.5V +/- 0.75V operation
• Applications include lighting timer for low-voltage landscape lighting