UL
®
LSI/CSI
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747
LS6506R
LS6507R
(631) 271-0400 FAX (631) 271-0405
June 2009
A3800
FEATURES:
•
Latching relay drive (LS6506R)
•
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
• Selectable time-out adjustments
•
3 Operating Modes:
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
PIR SENSOR INTERFACE
Operation for Mode 2 is as follows:
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.
Operation for Mode 3 is as follows:
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.
Refer to the application schematic of Figure 2:
Whenever the mo-
mentary switch SW1 is pressed, a 7 second delay period (60Hz opera-
DESCRIPTION
tion) or an 8.4 second delay period (50Hz operation) occurs in which
The
LS6506R
is a CMOS integrated circuit designed for room oc- the momentary switch operation is disabled. This enables capacitor C9
cupancy detection and can be used for switching power on to all types to be recharged so that the next operation of SW1 will be properly rec-
of AC loads. The circuit drives a two-coil latching relay (Figure 2). When ognized.
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- An additional control potentiometer at the LDR input is used to adjust
ground connection that is located in a standard wall box. The maximum the amount of ambient light required to prevent occupancy detection
current draw from the ground line is 500µA RMS. The
LS6507R
draws from turning the lights on (Mode 1 only) and from resetting the time-out
its power from the AC HOT and AC NEUTRAL lines. All timing is gener- counter. The occurrence of an ambient light condition will not affect a
ated from the AC input.
timeout already in progress.
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.
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 V
REG
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.
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.
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.
6506R-060209-1
INPUT / OUTPUT DESCRIPTION
PIR AMPLIFIER
This is a two stage amplifier. Each stage can be set
to have its own amplification and bandwidth.
Pins 15
and 16
make up the positive and negative inputs for
Stage 1 and
Pin 1
is the output. The two inputs allow
for single-ended or differential connection to PIR
Sensors.
Pin 2
is the negative input for Stage 2. The
output of Stage 2 is applied to an internal compar-
ator. The positive input of Stage 2 is internally
biased so that the comparator’s lower and higher
threshold can be fixed relative to this bias. Only
those signals greater than a fixed threshold appear
at the output of the window comparator.
Refer to Figure 4.
LR1 / LR2 OUTPUT
(LS6506R,
Pin 6 / Pin7)
For the
LS6506R,
a 16.66ms negative going pulse
appears on the LR1 output whenever conditions call
for the latching relay to turn on. When conditions call
for the latching relay to turn off, a 16.66ms negative
going pulse appears on the LR2 output. Each output
is capable of sinking 50mA. The outputs are gener-
ated in synchronism with the AC voltage input such
that the leading edge of these outputs always occur
when the AC voltage input switches low. Refer to
Figure 6. Potentiometers R2 and R5 are adjusted so
that the relay contacts always close and open at the
AC zero-crossover at the load.
TRIAC OUTPUT
(LS6507R,
Pin7)
With the output duration timer on and a 2.7V P-P
60Hz Signal applied to the AC input, the output pro-
duces a negative going 32us wide pulse in each
half-cycle delayed a nominal 1.2ms from the zero-
crossing. Refer to Figure 3. Resistors R9 and R10
are used to generate the input which is then AC-
coupled into the chip through C9.
AC INPUT
(Pin
5)
This input is derived from the AC hot line input. For
the
LS6506R
it is used for synchronizing the relay
drive outputs. For the
LS6507R
it is used for gener-
ating the triac output. It is also the source for all tim-
ing in the
LS6506R
and
LS6507R.
ON/OFF INPUT
(Pin
12)
The On/Off input is a momentary input used to turn the latch-
ing relay on or off (LS6506R) or to enable or disable output
pulses to a triac (LS6507R). Refer to the state diagrams of
Figure 5. This input has a pull-up resistor which allows the
use of a SPST momentary switch.
LDR INPUT
(Pin
11)
The Light Determining Resistor (LDR) input is used to inhibit
motion from turning on the load during daylight hours. Re-
ferring to Figure 2, the ambient level for inhibiting turn-on
can be adjusted. There is also approximately 10% hysteresis
between inhibiting and enabling at the LDR input. Under cer-
tain conditions the LDR input is also used to keep the load
off when motion is detected. Refer to Figure 5, Mode 1.
TIME CONTROL INPUT
(Pin
13)
The voltage level at the time out control input selects 5 differ-
ent timeouts and the Walking Test as shown in Table 1. A
potentiometer can be used for these selections as shown in
Figure 2.
MODE INPUT
(Pin
10)
This input has a pull-up resistor. When this input is left float-
ing, Mode 1 is selected. When this input is tied to ground,
Mode 2 is selected.
LED OUTPUT
(Pin
9)
This is an open drain output which generates negative-going
pulses whenever motion is detected. The output is not af-
fected by the LDR input. It is used to sink current from a se-
ries Resistor – LED network as shown in Figure 3.
5V REGULATOR OUTPUT
(Pin
14)
This regulator is used to provide power to the PIR sensor
and the internal PIR amplifiers as well as the external time-
out and LDR networks.
6506R-042908-2
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