PIR SENSOR INTERFACE - LSI Computer Systems
Description
LSI/CSI
LS6511N LS6512 LS6513
U® L LSI Computer Systems, Inc.
1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405
A3800
PIR SENSOR INTERFACE
September 2009
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 • 75µA Typical Supply Current • Undervoltage Detection • LS6511N(DIP); LS6511N-S (SOIC) - See Figure 1A
LS6512(DIP); LS6512-S (SOIC) - See Figure 1A LS6513(DIP); LS6513-S (SOIC) - See Figure 1B
APPLICATIONS: Security system intrusion detection, automatic doors, motion triggered events such as remote animal photography, etc.
DESCRIPTION (See Figure 5) The LS6511N, LS6512 and LS6513 are CMOS integrated circuits 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 greater than a fixed threshold at the output of the Differential Amplifier to appear at the 2 outputs of the Window Comparator.
One output detects positive input signals while the other output detects negative input signals.
COMPARATOR DIGITAL FILTER The outputs of the Window Comparator are filtered so that motion must be present for a certain duration before it c...
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