LSI/CSI
U
L
®
A3800
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405
LS6505
PIR SENSOR INTERFACE
FEATURES:
• Direct Interface with PIR Sensor
• Two-Stage Differential Amplifier
• Amplifier Gain and Bandwidth externally controlled
• Window Comparator and Digital Filter limit Noise
• Triac Output Drive
• Programmable Output Duration Timer
• Selectable Dead Time
• Single or Dual Pulse Detection
• Timing derived from 50Hz/60Hz AC
• Motion Detection LED Indicator
• LS6505 (DIP), LS6505-S (SOIC)- See Figure 1
APPLICATIONS:
Wall and ceiling mounted occupancy sensors providing
energy savings and convenience.
DESCRIPTION (See Figure 2)
The LS6505 is a CMOS integrated circuit, designed for detecting
motion from a PIR Sensor and initiating appropriate responses.
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 connection 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 thresholds 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.
SINGLE PULSE / DUAL PULSE MODES
The logic level at the Pulse Mode Select input selects Single Pulse
(SP) or Dual Pulse (DP) mode. The trigger for the Output Duration
Timer is generated by requiring one (SP Mode) or two (DP Mode)
pulses to be present at the Digital Filter output within a specified
time period. SP Mode = 0; DP Mode = 1
OUTPUT DURATION TIMER (See Table 1 and Figure 3)
The timeout is selected by the voltage level at the Timer Control input. The Timer’s trigger is generated from pulses at the Digital filter
output. In Auto operation, the Timer controls the On duration of the
Triac output and is retriggerable.
DEAD TIME (See Table 2)
False turn-ons are prevented from occurring by establishing a
Dead Time between the end of the timeout of the Output Duration
Timer and the retriggering of that Timer.
6505-110602-1
November 2002
PIN ASSIGNMENT - TOP VIEW
VSS
VDD
1
LSI
2
3
4
5
6
7
8
LS6505
FIGURE 1
DIFF. AMP 1 INPUT (-)
16
DIFF. AMP 1 INPUT (+)
15
14
WARNING OUTPUT
TIMER CONTROL INPUT
13
DEAD TIME SELECT INPUT
12
OPERATION SELECT INPUT
11
PULSE MODE
10
SELECT INPUT
LED OUTPUT
9
DIFF. AMP. 1 OUTPUT
DIFF. AMP. 2 INPUT (-)
DIFF. AMP. 2 OUTPUT
MODE SELECT INPUT
AC INPUT
TRIAC OUTPUT
TRIAC OUTPUT
This open drain output turns On when the Output Duration
Timer is triggered. The output drives a Triac gate. With the Output Duration Timer On and a 2.7V P-P 60Hz signal applied to
the AC input, this output produces a negative going pulse in
each half-cycle delayed a nominal 1.2ms from the zero crossing.
There is no more than 150us difference between the zerocrossing delay of each pulse.
WARNING OUTPUT
This output goes high for 2 sec beginning 7.5 sec before the
Triac output turns off. This signal can be used to trigger an
audible or visual alert.
LED OUTPUT (See Figure 3)
Normally, the status of the LED output is opposite to the Triac
output, but in Auto operation the LED output flashes on for one
second whenever motion is detected.
MODE SELECT
Open = Mode A, Vss = Mode B, VDD = Mode C
OPERATION SELECT (See Figure 3, S1)
The 3-state Operation Select input determines the operation of
LS6505 in accordance with the selected Mode as shown below:
Input Mode A Mode B Mode C
VDD On (1) (3)
Open Auto Prior Condition Auto
Vss Off (2) (4)
(1) Momentary application of VDD turns on the Triac output and
starts Auto operation. After the Triac output is off for 15
seconds, Auto operation terminates.
(2) Momentary application of Vss turns off the Triac output.
(3) Same as (1) except that Auto operation does not terminate.
(4) Same as (2) except that after the Triac output is off for 8
seconds, Auto operation begins.
ABSOLUTE MAXIMUM RATINGS:
PARAMETER SYMBOL VALUE UNIT
DC supply voltage VDD - VSS +5.5 V
Any input voltage VIN VSS - 0.3 to VDD + 0.3 V
Operating temperature TA -40 to +85 °C
Storage temperature TSTG -65 to +150 °C
ELECTRICAL CHARACTERISTICS:
( All voltages referenced to VSS, TA = -40˚C to +55˚C, 4.5V ≤ VDD ≤ 5.5V, unless otherwise specified.)
PARAMETER SYMBOL MIN TYP MAX UNIT CONDITIONS
SUPPLY CURRENT:
VDD = 5V IDD - 150 200 µA Triac and LED
VDD = 4.5V - 5.5V IDD - 180 240 µA outputs not loaded
DIFFERENTIAL AMPLIFIERS:
Open Loop Gain, Each Stage G 70 - - dB Common Mode Rejection Ratio CMRR 60 - - dB Power Supply Rejection Ratio PSRR 60 - - dB Output Drive Current ID - - 25 µA -
Input Sensitivity VS 100 - - 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 5,000)
Input Dynamic Range - 0 - 2.5 V -
Diff. Amp 2 Internal VIR - 0.4VR - V -
Reference
COMPARATOR:
Lower Reference VTHL - VIR - 0.5V - V Higher Reference VTHH - VIR + 0.5V - V -
DIGITAL FILTER:
Input Pulse Width TPW 66.3 - - ms 60Hz operation
(for recognition) TPW 79.6 - - ms 50Hz operation
OUTPUT DRIVE CURRENT:
Triac IO -40 - - mA With 3V Triac Gate
Warning: Source Current Iw + 2 - - mA Vo =VDD - 0.5V
Sink Current Iw - 1 - - mA Vo = 0.3V Max
TRIAC OUTPUT TIMING:
Pulse Width TTPW 20 30 45 µs VDD = 5V, f = 60Hz and
Delay from zero crossover TOD 1.00 1.2 1.32 ms 2.7V P-P AC input
Delay difference between TODD - - 150 µs f = 60Hz
zero crossovers
AC INPUT IMPEDANCE ZAC 270 - - kΩ LED OUTPUT:
Source Current IS+ 2 - - mA Vo = VDD - 0.5V
Sink Current IS- 1 - - mA Vo = 0.3V
Pulse Width TLPW 0.75 1 1.25 sec f = 60Hz
DUAL PULSE MODE:
Time between pulse-pairs TR - - 5.125 sec f = 60Hz
for motion recognition
6505-110102-2
TABLE 1
OUTPUT DURATION TIMER AS A FUNCTION OF TIMER
CONTROL INPUT VOLTAGE
(f = Frequency at AC input)
TABLE 2
DEAD TIME DURATION AS A FUNCTION OF THE
STATE OF DEAD TIME SELECT INPUT
(f = Frequency at AC input)
INPUT VOLTAGE f = 50Hz f = 60Hz UNIT
0 18 15 sec
1/16 VDD 36 30 sec
2/16 VDD 54 45 sec
3/16VDD 72 60 sec
4/16 VDD 2.4 2 min
5/16 VDD 3.6 3 min
6/16 VDD 4.8 4 min
7/16 VDD 6 5 min
8/16 VDD 7.2 6 min
9/16 VDD 8.4 7 min
10/16 VDD 9.6 8 min
11/16VDD 10.8 9 min
12/16 VDD 12 10 min
13/16 VDD 14.4 12 min
14/16 VDD 16.8 14 min
15/16 VDD 18 15 min
DIFF AMP 2
OUTPUT
DIFF AMP 2
INPUT (-)
3
2
WINDOW
COMPARATOR
INPUT STATE f = 50Hz f = 60Hz UNIT
0 0 0 sec
OPEN 1.2 1 sec
1 2.4 2 sec
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use.
FIGURE 2. LS6505 BLOCK DIAGRAM
(+V)
8
VDD
DIFF AMP 1
OUTPUT
DIFF AMP 1
INPUT (-)
DIFF AMP 1
INPUT (+)
TIMER
CONTROL
INPUT
OPERATION SELECT
INPUT
MODE SELECT INPUT
DEAD TIME
SELECT INPUT
1
16
15
13
11
12
-
AMP
+
A/D
CONVERTER
4
+V
-
AMP
+
OUTPUT
DURATION
TIMER
-
+
-
+
COMP
COMP
DIGITAL
FILTER
PULSE
SELECT
LOGIC
CONTROL
LOGIC
DEAD
TIME
TIMER
1 SECOND
PULSE GEN
(-V)
OUTPUT
BUFFER
ZERO CROSS-OVER
6
DETECT
VSS
9
LED OUTPUT
10
7
TRIAC OUTPUT
WARNING OUTPUT
14
PULSE MODE
SELECT INPUT
AC INPUT
5
6505-110102-3
DD
DD
DD
DD
DD
S1 = SPDT (Mom - Off - Mom)
S1 = SPDT (On - Off - On)
NOTE:
LED
Open for Mode A
Vss for Mode B
VDD for Mode C
LOAD
N
MT2
MT1
AC MAINS
P
SW
FIGURE 3. TYPICAL WALL SWITCH OCCUPANCY SENSOR APPLICATION
R2
C2
+
C1
1
C3
+
R3
C4 R4
V
SEE
R9
NOTE
R8
R6
TI
G
C11
C6Z1D1
VDC
C8
VSS
IN
C7
+
R7
OUT
U1
AMP 1
OUT
2
AMP 2
(-)IN
3
4
MODE
SELECT
5
AC
6
VSS
7
TRIAC
OUT
8
V
AMP 2
OUT
AMP 1
AMP 1
WARNING
TIMER
CONTROL
DEAD TIME
OPERATION
PULSE
MODE
LS6505
(-)IN
(+)IN
SEL
SEL
SEL
LED
OUT
16
15
14
13
12
11
10
VDD
R5
V
SPDT (On - On)
R11
9
-
R1
C5
SPDT (On - Off - On)
S1
V
VDD
VDD
R10
VDC
R12
Q1
PIR
SENSOR
S1 (MODE A)
OFF
S1 (MODE B, MODE C)
ON
V
AUTO
VDD
R1 = 36kΩ R7 = 1kΩ
R2 = 2.7MΩ R8 = 910kΩ
R3 = 36kΩ R9 = 7.5kΩ
R4 = 2.7MΩ R9 = 3.6kΩ
R5 = 36kΩ R10 = 1.0MΩ (variable)
*
R6 = 240Ω,1/2W R11= 51kΩ
R6 = 1kΩ,1W R12 = 10kΩ
*
All Resistors 1/4W, all Capacitors 10V unless otherwise
specified. PIR = HEIMANN LHi 958 or 878 (Typical)
C9
C10
C1 = 33µF C9 = 33µF
C2 = 0.01µF C10 = 0.1µF
C3 = 33µF C11 = 0.033µF
C4 = 0.01µF D1 = 1N4004
C5 = 0.1µF Z1 = 24V, 1/2W
C6 = 1.5µF, 250V T1 = Q4008L4 (Typical)
C6 = 1.0µF, 400V T1 = Q5004L4 (Typical)
*
C7 = 1000µF U1 = LM78L05 or equivalent
C8 = 0.1µF, 250V (5V Regulator)
C8 = 0.1µF, 400V Q1 = MPS8099
*
= Component change for 220VAC
*
NOTES: 1. The R8, R9, C8 network provides a 2.7V Peak-to-Peak AC signal input to Pin 5.
2. The C7, D1, Z1, C6, R6 components generate the DC Supply Voltage for the LS6505.
3. The R1, C1, R2, C2, R3, C3, R4, C4, R5, C5 components and the two on-chip Differential Amplifiers set a
nominal gain of 5,500 with bandpass filtering of 0.13Hz to 6Hz.
FIGURE 4. ADAPTING WALL SWITCH FOR 3-WAY OPERATION
Occupancy Sensor Module
To P
To Load
to LS6505-11
R
from MT2
C
Vss
R = 510k , 1/4W
C = 0.01µF, 10V
AC Hot
Remote Switch Module
AC Hot
S
Remote Control
S = SPST (Mom-Off)
*
When operated in Mode B or Mode
C, the wall switch occupancy sensor
shown in Figure 3 can easily be
adapted to operate with a remote
switch by adding an R-C network to
the occupancy sensor module. R
limits the current from the remote
module into Pin 11 of the LS6505
and C suppresses noise.
6505-110602-4
Loading...