LS6505

UL ® LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 LS6505 (631) 271-0400 FAX (631) 271-0405 November 2002 A3800 PIR SENSOR INTERFACE FEATURES: Direct Interface with PIR Sensor Two-Stage Differential Amplifier Amplifier Gain and Bandwidth externally controlled Window Comparator and Digital Filter limit Noise Triac Output Drive Programmable Output Duration Timer Selectable Dead Time Single or Dual Pulse Detection Timing derived from 50Hz/60Hz AC Motion Detection LED Indicator LS6505 (DIP), LS6505-S (SOIC)- See Figure 1 APPLICATIONS: Wall and ceiling mounted occupancy sensors providing energy savings and convenience. DESCRIPTION (See Figure 2) The LS6505 is a CMOS integrated circuit, designed for detecting motion from a PIR Sensor and initiating appropriate responses. DIFFERENTIAL AMPLIFIER Each stage of the two stage Differential Amplifier can be set to have its own amplification and bandwidth. The two inputs to the first stage allow for single ended or differential connection to PIR Sensors. This stage can be biased anywhere in its dynamic range. The second stage is internally biased so that the Window Comparator’s lower and higher thresholds can be fixed relative to this bias. WINDOW COMPARATOR The Window Comparator provides noise filtering by enabling only those signals equal to or greater than a fixed threshold at the output of the Differential Amplifier to appear at the output of the Window Comparator. COMPARATOR DI...