ELM365

ELM365 Security System Controller Description The ELM365 provides all of the logic necessary for a complete security system in an 8 pin package. The circuit is capable of monitoring two normally closed input loops and one normally open panic circuit, provides a constant level and a pulsing alarm output, and the logic to drive a status LED. Internal timers are provided for alarm blocking during zone entry and exit as well as circuit resetting, should alarms go unacknowledged. Debouncing of all of the inputs is also provided internally, to allow for the direct interfacing to mechanical switches. Due to the digital techniques employed, no external support components are required for any of the timing functions, resulting in considerable cost savings over other designs. Applications Home or cottage security systems Auto or RV security systems Individual zone monitoring in a multizone system High or low limit warning alarms Features Low power CMOS design - typically 1mA at 5V Wide supply range - 3.0 to 5.5 volt operation Simultaneous monitoring of three circuits 45 second delay for entry and exit Automatic reset of alarm outputs after 5 minutes Status LED output driver High current drive outputs - up to 25 mA Panic input for instant triggering of the alarm Connection Diagram PDIP and SOIC (top view) VDD 1 OutP 2 OutC 3 panic 4 8 VSS 7 DLoop 6 ILoop 5 LED Block Diagram VDD DLoop 7 VDD ILoop 6 VDD panic 4 45 sec Delay 45 sec PowerUp Alarm Latch Alarm...