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LS6501 Datasheet(PDF) 1 Page - LSI Computer Systems

Part # LS6501
Description  PIR MOTION DETECTOR
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Manufacturer  LSI [LSI Computer Systems]
Direct Link  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS6501 Datasheet(HTML) 1 Page - LSI Computer Systems

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FEATURES:
• Low Quiescent Current
• Direct Interface with PIR Sensor
• Two-Stage Differential Amplifier
• Amplifier Gain and Bandwidth externally controlled
• Window Comparator and Digital Filter limit Noise
• Triac or Relay Output Drive
• Programmable Output Duration Timer
• Ambient Light Level Inhibit input
• Selectable Dead Time
• Single or Dual Pulse Detection
• Timing derived from RC Oscillator or 50Hz/60Hz AC
• Regulated 5V Output for PIR Sensor
• Motion Detection LED Indicator
• Triac can drive Incandescent or Fluorescent Lamps
• LS6501LP (DIP), LS6501LP-S (SOIC-NB)
LS6501LP-SW (SOIC-WB) - See Figure 1
APPLICATIONS:
• Automatic Light Control
• Intrusion Alarm
DESCRIPTION: (See Figure 2)
The LS6501LP is a monolithic, CMOS Silicon Gate in-
tegrated circuit, designed for detecting motion from a PIR
Sensor and initiating appropriate responses. The detailed
description of the functional blocks is as follows:
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 con-
nection 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 thresh-
olds 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 DIGITAL FILTER
The output of the Window Comparator is filtered so that
motion must be present for a certain duration before it can
be recognized and appear as pulses at the Digital Filter
output.
OUTPUT DURATION TIMER
The voltage level at the TIMER CONTROL input can
select 16 different timeouts for this Timer (See Table 1).
The selection can be made by varying the setting of a
potentiometer. The Timer is retriggerable and controls
the ON duration of the TRIAC/RELAY output. The trigger
for the Timer is generated from pulses appearing at the
Digital Filter output.
SINGLE PULSE/DUAL PULSE MODES
A Single Pulse or Dual Pulse (two pulses occurring within
a specified time period) at the Digital Filter output can be
selected as the trigger for the Output Duration Timer.
This selection is made by the logic level at the PULSE
MODE SELECT input. Logic 0 = Single Pulse Mode,
logic 1 = Dual Pulse Mode.
LED OUTPUT
This is an open drain output which is turned on by pulses
generated by a retriggerable one-shot. The one-shot is
triggered by the leading edge of pulses appearing at the
Digital Filter output. When turned on, this output can sink
current from a series Resistor-LED network returned to a
positive voltage (V DD to 12.5V maximum). This results in
the LED lighting whenever motion is detected.
PIR MOTION DETECTOR
July 2001
6501LP-071201-1
1
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DIFF. AMP. 2 INPUT (-)
DIFF. AMP. 2 OUTPUT
AC INPUT
OSCILLATOR INPUT
TRIAC/RELAY OUTPUT
V DD
DIFF. AMP 1 INPUT (-)
DIFF. AMP 1 INPUT (+)
5V REGULATOR OUTPUT
TIMER CONTROL INPUT
DEAD TIME SELECT INPUT
INHIBIT INPUT
PULSE MODE
SELECT INPUT
LED OUTPUT
PIN ASSIGNMENT - TOP VIEW
FIGURE 1
DIFF. AMP. 1 OUTPUT
V SS
LSI/CSI
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747
(631) 271-0400 FAX (631) 271-0405
LS6501LP
UL
®
A3800


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