LS6511

LSI/CSI UL ® LS6511 (631) 271-0400 FAX (631) 271-0405 October 2002 LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 A3800 PIR SENSOR INTERFACE FEATURES: Direct Interface with PIR Sensor Two-Stage Differential Amplifier Amplifier Gain and Bandwidth externally controlled True and Complementary Output Drives Separate digital filters for processing positive and negative input signals Single Pulse/Dual Pulse/ Concurrent Pulse Detection Adjustable Output Pulse Width Optional 5V Shunt Regulator Output 50µA Typical Supply Current Undervoltage Detection LS6511(DIP); LS6511-S (SOIC) - See Figure 1 APPLICATIONS: Security system intrusion detection, automatic doors, motion triggered events such as remote animal photography. DESCRIPTION (See Figure 5) The LS6511 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. Signal levels as low as 100µV can be detected. WINDOW COMPARATOR The Window Comparator provides noise filtering by enabling only those signals equal to or gr...