LS6506R
LS6507R
LSI/CSI
U
® L
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405
A3800
June 2009
PIR SENSOR INTERFACE
Operation for Mode 2 is as follows:
FEATURES:
• Latching relay drive (LS6506R)
In this mode, lights can only be turned on by pressing the On/Off push-
button. Lights will remain on if occupancy is detected. Lights will turn
off automatically when occupancy no longer exists and the time-out
occurs. Lights can also be turned off by pressing the On/Off push-
button.
• LS6506R is suitable for incandescent and fluorescent lights,
electronic and magnetic ballasts, motors and heaters, etc.
• Triac drive (LS6507R)
• Sensitivity adjustment
• Push-button for manual on/off control
• Ambient light override adjustment
Operation for Mode 3 is as follows:
• Selectable time-out adjustments
• 3 Operating Modes:
In this mode, Pins 10 and 12 are connected together. One momentary
switch is used instead of the two as shown in Figures 2 and 3. Lights
can be turned on by pressing the momentary pushbutton or by oc-
cupancy detection. Lights will remain on if occupancy is detected.
Lights will turn off automatically when occupancy no longer exists and
the time-out occurs. Lights can also be turned off by pressing the mo-
mentary pushbutton.
1. Manual On or Auto On / (Manual Off and Delayed Auto On) or
(Manual Off and Manual On) or Auto Off
2. Manual On / Manual Off or Auto Off
3. Manual On or Auto On / Manual Off or Auto Off
• LED indicator light for motion detection
• Controls 115VAC and 220VAC applications
• LS6506R (DIP), LS6506R-S (SOIC);
LS6507R (DIP), LS6507R-S (SOIC) - See Figures 1A & 1B
Refer to the application schematic of Figure 2: Whenever the mo-
mentary switch SW1 is pressed, a 7 second delay period (60Hz opera-
tion) or an 8.4 second delay period (50Hz operation) occurs in which
the momentary switch operation is disabled. This enables capacitor C9
to be recharged so that the next operation of SW1 will be properly rec-
ognized.
DESCRIPTION
The LS6506R is a CMOS integrated circuit designed for room oc-
cupancy detection and can be used for switching power on to all types
of AC loads. The circuit drives a two-coil latching relay (Figure 2). When
the latching relay is engaged, full AC power is connected to the load.
The LS6506R draws its power from the AC hot line and the house-
ground connection that is located in a standard wall box. The maximum
current draw from the ground line is 500µA RMS. The LS6507R draws
its power from the AC HOT and AC NEUTRAL lines. All timing is gener-
ated from the AC input.
An additional control potentiometer at the LDR input is used to adjust
the amount of ambient light required to prevent occupancy detection
from turning the lights on (Mode 1 only) and from resetting the time-out
counter. The occurrence of an ambient light condition will not affect a
timeout already in progress.
The circuit contains a two stage PIR amplifier. The sensitivity can be ad-
justed by replacing R5 in Figure 2 with a potentiometer. Upon power up
all inputs are disabled for a period of 56 seconds (60Hz operation) or 67
seconds (50Hz operation) in order for the PIR amplifier to reach its
quiescent operating state. The circuit contains two operating modes. Re-
fer to Figure 5 for State Diagrams.
The LS6506R can operate using a 12V latching relay. Figure 2 shows
typical resistor and capacitor values for a 12V relay. Z1 is specified as
a 15V zener diode. The chip generates its own 5V regulator to power
its internal circuits and a separate 5V regulator to power the two stage
PIR amplifier and external PIR. The LS6506R generates 16ms pulses
on two outputs for setting/resetting the latching relay. Upon power up,
the LS6506R generates a reset pulse as soon as its supply voltage
reaches the relay coil’s set/reset voltage. This ensures that the relay
comes up in the off position and occurs 20 seconds (60Hz operation)
or 24 seconds (50Hz operation) after power is applied.
Operation for Mode 1 is as follows:
Refer to Figure 2. The IC will power up in the Off-State, S0. A mo-
mentary pressing of the pushbutton switch SW1, or occupancy de-
tection, will cause a negative-going output pulse, LR1, to occur and turn
on the light and place the IC in the On-State, S1. If occupancy is not de-
tected, a negative-going output pulse, LR2, will cause the lights to turn
off after a time-out of 5, 10, 20 or 30 minutes, or 30 seconds, as se-
lected by a potentiometer control at the Timer Control input. If oc-
cupancy is detected before time-out occurs, the selected time-out be-
gins again. If time-out occurs and the lights switch off, then occupancy
detection, or pressing the pushbutton switch, will switch the lights back
on again. Once the unit is in S1, pressing the On/Off push-button switch
places the unit in the Off-State, S2, and turns the lights off and keeps
them off as long as motion is detected, or if motion is not detected the
lights will stay off for the time-out period. At the end of the time-out pe-
riod, the unit will revert to S0. Whether the lights are on or off, detected
motion will cause the LED indicator light to blink.
For triac operation, the LS6507R is shown in the Figure 3 application
schematic. The LS6507R has the same features as the LS6506R.
This circuit is intended for driving lamps, motors and heaters. The
LS6507R has a single output that generates a 50µs negative pulse to
drive the gate of a triac. The pulse output is delayed from the AC zero-
crossover point by 1.2ms. This delay still enables 99% power to be de-
livered to the load while allowing circuit power to be derived from the
connection to the load. The LS6507R application schematic does not
require connection to the house-ground.
For calibration purposes in either mode, connecting the Timer Control
to VREG will set the time-out to be 30 seconds allowing for walking test
to set the desired sensitivity. Note also that a two- position switch may
be used instead of a potentiometer for time-out control. In that case,
either 5 minutes or 30 seconds is available for time-out. The circuit
also has a built-in 2 second dead time at the end of the time-out to pre-
vent false turn-ons from occurring.
6506R-060209-1
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