LS6501LP_08 Datasheet, PDF (1/8 Pages) LSI Computer Systems – PIR SENSOR INTERFACE

LSI/CSI
LS6501LP
U_{® L LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 [phone] FAX [phone]}
A3800
PIR SENSOR INTERFACE
October 2008
FEATURES:
PIN ASSIGNMENT - TOP VIEW
• Low Quiescent Current
• Direct Interface with PIR Sensor
• Two-Stage Differential Amplifier
DIFF. AMP. 1 OUTPUT 1
16 DIFF. AMP 1 INPUT (-)
• Amplifier Gain and Bandwidth externally controlled
• Window Comparator and Digital Filter limit Noise
• Triac or Relay Output Drive
• Programmable Output Duration Timer
d _{• Ambient Light Level Inhibit input}
• Selectable Dead Time
e • Single or Dual Pulse Detection
• Timing derived from RC Oscillator or 50Hz/60Hz AC
u ^{• Regulated 5V Output for PIR Sensor}
• Motion Detection LED Indicator
• LS6501LP (DIP); LS6501LP-S (SOIC-NB);
tin ^{LS6501LP-SW (SOIC-WB) - See Figure 1}
DIFF. AMP. 2 INPUT (-) ₂
DIFF. AMP. 2 OUTPUT 3
OSCILLATOR INPUT 4
AC INPUT 5
V SS 6
TRIAC/RELAY OUTPUT ⁷
V DD 8
15 _{DIFF. AMP 1 INPUT (+)}
14 5V REGULATOR OUTPUT
13 TIMER CONTROL INPUT
12 DEAD TIME SELECT INPUT
11 INHIBIT INPUT
10
PULSE MODE
SELECT INPUT
9 _{LED OUTPUT}
APPLICATIONS:
Indoor occupancy sensors and outdoor motion-triggered
n _{lighting for energy savings, security and convenience.}
.
o _{DESCRIPTION: (See Figure 2)}
c ^{The LS6501LP is a CMOS integrated circuit, designed for}
detecting motion from a PIR Sensor and initiating appropri-
is ^{ate responses. The detailed description of the functional}
blocks is as follows:
D ^{DIFFERENTIAL AMPLIFIER}
FIGURE 1
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
Each stage of the two stage Differential Amplifier can be set Digital Filter output.
to have its own amplification and bandwidth. The two inputs
to the first stage allow for single ended or differential con- SINGLE PULSE/DUAL PULSE MODES
nection to PIR Sensors. This stage can be biased anywhere A Single Pulse or Dual Pulse (two pulses occurring within
in its dynamic range. The second stage is internally biased a specified time period) at the Digital Filter output can be
so that the Window Comparator’s lower and higher thresh- selected as the trigger for the Output Duration Timer.
olds can be fixed relative to this bias.
This selection is made by the logic level at the PULSE
MODE SELECT input. Logic 0 = Single Pulse Mode,
WINDOW COMPARATOR
logic 1 = Dual Pulse Mode.
The Window Comparator provides noise filtering by enabling
only those signals equal to or greater than a fixed threshold LED OUTPUT
at the output of the Differential Amplifier to appear at the
This is an open drain output which is turned on by pulses
output of the Window Comparator.
generated by a retriggerable one-shot. The one-shot is
triggered by the leading edge of pulses appearing at the
COMPARATOR DIGITAL FILTER
Digital Filter output. When turned on, this output can sink
The output of the Window Comparator is filtered so that current from a series Resistor-LED network returned to a
motion must be present for a certain duration before it can positive voltage (V DD to 12.5V maximum). This results in
be recognized and appear as pulses at the Digital Filter
the LED lighting whenever motion is detected.
output.
6501LP-101308-1