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

to 12.5V maximum). This results in

the LED lighting whenever motion is detected.

PIR MOTION DETECTOR

July 2001

6501LP-071201-1

LSI

LS6501LP

DIFF. AMP. 2 INPUT (-)

DIFF. AMP. 2 OUTPUT

AC INPUT

OSCILLATOR INPUT

TRIAC/RELAY OUTPUT

DIFF. AMP 1 INPUT (-)

DIFF. AMP 1 INPUT (+)

5V REGULATOR OUTPUT

TIMER CONTROL INPUT

DEAD TIME SELECT INPUT

I N H I B I T I N P U T

PULSE MODE
SELECT INPUT

LED OUTPUT

PIN ASSIGNMENT - TOP VIEW

FIGURE 1

DIFF. AMP. 1 OUTPUT

LSI/CSI

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405

LS6501LP

A3800

INHIBIT
The Output Duration Timer can be inhibited from trig-
gering by the voltage level at the INHIBIT input. When this
voltage level exceeds the Inhibit Threshold, the Timer will
be prevented from triggering if it is OFF. If the Timer is
ON, the INHIBIT input is blocked from affecting the Timer.
There is approximately 10% hysteresis between the In-
hibit and Enable thresholds at the INHIBIT input. The LED
output is not affected by the INHIBIT input. An adjustable
Ambient Light Level Inhibit can be implemented by con-
necting a Light Determining Resistor (LDR) network to the
INHIBIT input (See Figures 3 and 4).

DEAD TIME
False turn-ons are prevented from occurring by es-
tablishing a Dead Time between the end of the timeout of
the Output Duration Timer and the retriggering of that
Timer. The state of the DEAD TIME SELECT input de-
termines the Dead Time duration (See Table 2).

OSCILLATOR
For battery operation, an external RC is connected to the
OSCILLATOR input to produce a 50Hz or 60Hz clock. A
30Hz clock can be used to extend timing durations (See
Tables 1 and 2).

DC POWER SUPPLY
V

-Vss is 8V±1V. Typical quiescent current is 250µA

(

TRIAC/RELAY, LED

and

REGULATOR

outputs not loaded).

DC REGULATOR
The LS6501LP includes a Regulator which provides a
nominal +5V to the Differential Amplifier and Window
Comparator and is available as an output to supply the
PIR Sensor.

TRIAC/RELAY OUTPUT
This open drain output turns ON when the Output Dura-
tion Timer is triggered. The output drives a Triac when
the OSCILLATOR input is tied to ground and 50/60Hz is
applied to the AC input (See Figure 3). The output drives
a Relay when the AC input is tied to ground and an RC
network is connected to the OSCILLATOR input (See
Figure 4).

TRIAC DRIVE (See Figure 3)
With the Output Duration Timer ON and a 2.7V P-P
60Hz signal applied to the AC input, the output produces
a negative-going pulse in each half-cycle delayed a
nominal 1.2ms from the zero crossing. There is no more
than 150µs difference between the zero-crossing delay
of each pulse.

RELAY DRIVE (See Figure 4)
The output can sink current continously with the Output
Duration Timer ON and the OSCILLATOR input active.
This output can sink current from a relay coil returned to
a positive voltage (V

to 12.5V maximum).

1/16 V

2/16 V

3/16 V

120

4/16 V

2.4

5/16 V

3.6

6/16 V

4.8

7/16 V

8/16 V

7.2

9/16 V

8.4

10/16 V

9.6

11/16 V

10.8

12/16 V

13/16 V

14.4

14/16 V

16.8

15/16 V

TABLE 1

OUTPUT DURATION TIMER AS A FUNCTION OF TIMER CONTROL INPUT VOLTAGE

(f = Frequency at AC input or OSCILLATOR input)

INPUT VOLTAGE f = 30Hz f = 50Hz f = 60Hz UNIT

TABLE 2

DEAD TIME DURATION AS A FUNCTION OF THE STATE OF DEAD TIME SELECT INPUT

(f = Frequency at AC input or OSCILLATOR input)

INPUT STATE f = 30Hz f = 50Hz f = 60Hz UNIT

1.2

OPEN

4.8

9.6

6501LP070601-2

sec
sec
sec
sec
min
min
min
min
min
min
min
min
min
min
min
min

sec
sec
sec

ABSOLUTE MAXIMUM RATINGS:

PARAMETER

SYMBOL

VALUE

UNIT

DC supply voltage

DD -

+10

Any input voltage

- 0.3 to V

+ 0.3

Operating temperature

-40 to +85

°C

Storage temperature

STG

-65 to +150

°C

ELECTRICAL CHARACTERISTICS:
( All voltages referenced to V

, T

= -40°C to +55°C, 7V

9V, unless otherwise specified.)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNIT

CONDITIONS

SUPPLY CURRENT:

= 8V

250

350

µA

TRIAC/RELAY,

= 7V - 9V

300

420

µA

LED and REGULATOR
outputs not loaded

REGULATOR:

Voltage

4.5

Current

200

µA

DIFFERENTIAL AMPLIFIERS:
Open Loop Gain,

Each Stage

Common Mode

Rejection Ratio

CMRR

Power Supply

Rejection Ratio

PSRR

Output Drive Current

µA

Input Sensitivity

µV

TA = 25°C, with Amplifier

(Minimum Detectable Voltage

Bandpass configuration

to first amplifier when both

as shown in Figure 3

amplifiers are cascaded for
a net gain of 7,500)

Input Dynamic Range

2.5

Diff. Amp 2 Internal

.4V

Reference

COMPARATOR:

Lower Reference

THL

- .5V

Higher Reference

THH

+ .5V

DIGITAL FILTER:
Input Pulse Width

66.3

60Hz operation

(for recognition)

79.6

50Hz operation

INHIBIT INPUT:
Inhibit Threshold

THI

.5V

Enable Threshold

THE

.45V

OSCILLATOR:

Resistor

2.2

60Hz Oscillator

Capacitor

.01

µF

Frequency

Resistor

4.3

30Hz Oscillator

Capacitor

.01

µF

Frequency

6501LP-070601-3

PARAMETER

SYMBOL

MIN

TYP

MAX

UNIT

CONDITIONS

OUTPUT DRIVE CURRENT:
Triac (AC MODE)

-40

With 3V Triac Gate Drive

Relay (DC MODE)

-10

With 1V Max. across the
LS6501LP.

TRIAC OUTPUT TIMING:
Pulse Width

TPW

µs

= 8V, f = 60Hz and

Delay from zero crossover

1.00

1.2

1.32

2.7V P-P AC

input

Delay difference between

ODD

150

µs

f = 60Hz

zero crossovers

AC INPUT IMPEDANCE

270

LED OUTPUT:

Sink Current

= 8V, Vo = .5V Max.

Pulse Width

LPW

.75

1.25

sec

f = 60Hz.

DUAL PULSE MODE:

Time between

pulse-pairs

5.125

sec

for motion recognition

6501LP-070601-4

AMP

COMP

DIFF AMP 2
OUTPUT

DIFF AMP 2
INPUT (-)

DIFF AMP 1
OUTPUT

DIFF AMP 1
INPUT (-)

DIFF AMP 1
INPUT (+)

A/D

CONVERTER

OUTPUT
DURATION
TIMER

DIGITAL
FILTER

CONTROL
LOGIC

DEAD
TIME
TIMER

1 SECOND
PULSE GEN

REG

5 VOLT
REGULATOR

VREG

OUTPUT
BUFFER

ZERO CROSS-OVER

DETECT

OSCILLATOR

TIMER
CONTROL
INPUT

INHIBIT INPUT

PULSE MODE
SELECT INPUT

DEAD TIME
SELECT INPUT

5V REGULATOR
OUTPUT

LED OUTPUT

TRIAC/RELAY OUTPUT

AC INPUT

OSCILLATOR INPUT

FIGURE 2. LS6501LP BLOCK DIAGRAM

REG

INHIBIT

COMPARATOR

PULSE
SELECT
LOGIC

WINDOW

COMPARATOR

FIGURE 3. TYPICAL TRIAC WALL SWITCH APPLICATION

AMP 1
OUT

AMP 1

(-)IN

AMP 2
(-)IN

AMP 1

(+)IN

AMP 2
OUT

5V REG

OUT

OSC

TIMER

C O N T R O L

DEAD TIME

SEL

INH

TRIAC
OUT

P U L S E

MODE

SEL

LED

OUT

AC MAINS

LOAD

MT2

MT1

R11

R10

PIR
S E N S O R

R12

R14

LDR

R13

R15

LED

L S 6 5 0 1 L P

S1 = SPDT (On-Off-On)

SPDT (On -On)

R1 = 36k

R8 = 1k

R2 = 36k

R9 = 910k

R3 = 2.7M

R10 = 7.5k

R4 = 36k

R10 = 3.6k

R5 = 2.7M

R11 = 100

R6 = 36k

R12 = 1.0M

R7 = 270

,1/2W

R13 = 1.0M

R7 = 1k

,1W

R14 = 910k

R15 = 3.6k

All Resistors 1/4W, all Capacitors 10V
unless otherwise specified.

C1 = 100µF

C8 = 1000µF

C2 = 33µF

C9 = .1µF, 250V

C3 = .01µF

C9 = .1µF, 400V

C4 = 33µF

D1 = 1N4004

C5 = .01µF

LDR = SILONEX HSL-19M52 (Typical)

C6 = .1µF

Z1 = 9.1V, 1/2W

C7 = .47µF, 250V

T1 = Q4008L4 (Typical)

C7 = .33µF, 400V

T1 = Q5004L4 (Typical)

PIR = HEIMANN LHi 958 or 878 (Typical)

= Component change for 220VAC

6501LP-071201-5

NOTES: 1. The R9, R10, C9 network provides a 2.7V Peak-to-Peak AC signal input to Pin 5.

2. The C8, D1, Z1, C7, R7 components generate the DC Supply Voltage for the LS6501LP.
3. The R2, C2, R3, C3, R4, C4, R5, C5, R6, C6 components and the two on-chip Differential Amplifiers set a
nominal gain of 5,500 with bandpass filtering of .13Hz to 6Hz.

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