LS6501LP
LSI/CSI
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405
U
® L
A3800
PIR MOTION DETECTOR
July 2001
FEATURES:
• Low Quiescent Current
PIN ASSIGNMENT - TOP VIEW
• 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
DIFF. AMP. 1 OUTPUT
1
16
15
DIFF. AMP 1 INPUT (-)
DIFF. AMP. 2 INPUT (-)
2
3
4
5
6
7
8
DIFF. AMP 1 INPUT (+)
5V REGULATOR OUTPUT
TIMER CONTROL INPUT
DIFF. AMP. 2 OUTPUT
OSCILLATOR INPUT
AC INPUT
14
13
12
11
10
9
• Single or Dual Pulse Detection
DEAD TIME SELECT INPUT
INHIBIT INPUT
• 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
VSS
PULSE MODE
SELECT INPUT
TRIAC/RELAY OUTPUT
VDD
LED OUTPUT
FIGURE 1
APPLICATIONS:
• Automatic Light Control
• Intrusion Alarm
DESCRIPTION: (See Figure 2)
OUTPUT DURATION TIMER
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:
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.
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.
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.
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.
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 (VDD to 12.5V maximum). This results in
the LED lighting whenever motion is detected.
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.
6501LP-071201-1
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