PT8A2641-2642/2645-2648
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PIR Sensor Light Switch
Product Features
Operating voltage: 5V (Typ.)
Average supply current: 120µ (Typ.)
A
2 stage op-amp for filter.
Build-in noise rejection circuit.
On-chip regulator.
Adjustable output duration
Override function.
ON/AUTO/OFF selectable by MODE pin
Apply to AC 220V/50Hz and 110V/60Hz.
Auto-reset if the ZC signal disappears over 3
seconds
Output pulse (PT8A2641/5/7) to drive triac or
output level (PT8A2642/6/8) to drive relay.
CDS to enable/disable output.
40 second warm-up.
Quick check mode for installation.
Product Description
The PT8A264X is a CMOS LSI chip designed
for use in automatic PIR lamp control. It can operate
with a 2-wire configuration for triac applications or
with a 3-wire configuration for relay applications.
The chip is equipped with operational amplifiers, a
comparator, timer, a zero crossing detector, control
circuit, a voltage regulator, a system oscillator, and
an output timing oscillator.
Its PIR sensor detects infrared power variations
induced by the motion of a human body and
transforms it to a voltage variation. If the PIR output
voltage variation conforms to the criteria (refer to the
functional description), the lamp is turned on with an
adjustable duration. The PT8A264X offers three
operating modes (ON, AUTO, OFF) which can be set
through the MODE pin. While the chip is working in
the AUTO mode the user can override it and switch
to the quickly install mode, or manual ON mode, or
return to the AUTO mode by switching the power
switch.
Block Diagram
Figure 1 Block Diagram
OP2O
OP2N
OP2P
_
Comparator
+
Voltage
divider
+
_
Regulator
Control
circuit
Output
circuit
Delay
circuit
Frequency
divider
Zero cross
debounce
latch circuit
Mode and CDS
control circuit
MODE
CDS
COMPO
CDSO
RSTB
OP1O
OP1P
OP1N
VEE
RELAY
TRIAC
GND
Vcc
ZC
OSCD
delay
oscillator
System
oscillator
OSCS
12-07-0006
1
PT0192-3
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Pin Configuration
GND
TRIAC
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
RSTB
VEE
GND
RELAY
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
RSTB
VEE
PT8A2641P/2641W
PT8A2642P/2642W
GND
TRIAC
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
CDSO
VEE
GND
RELAY
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
CDSO
VEE
PT8A2645P/2645W
PT8A2646P/2646W
GND
TRIAC
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
COMPO
VEE
GND
RELAY
OSCD
OSCS
ZC
CDS
MODE
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
COMPO
VEE
PT8A2647P/2647W
PT8A2648P/2648W
12-07-0006
2
PT0192-3
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Pin Description
2641
1
Part number
2642 2645 2646 2647
1
1
1
1
2648
1
Pin name
GND
I/O
I
Description
Ground
RELAY drive output through an external NPN
-
2
-
2
-
2
RELAY
O
transistor, active high
TRIAC drive to output two negative pulses, active
2
-
2
-
2
-
TRIAC
O
negative pulse.
Output timing oscillator I/O
3
3
3
3
3
3
OSCD
I/O It is connected to an external RC to adjust output
duration.
System oscillator I/O OSCS is connected to an
4
4
4
4
4
4
OSCS
I/O external RC to set the system frequency. The
system frequency =16KHz for normal application.
5
5
5
5
5
5
ZC
I
Schmitt input for AC zero crossing detection
CDS is connected to a CDS voltage divider for
daytime/night auto-detection. Low input to this pin
6
6
6
6
6
6
CDS
I
can disable the PIR input. CDS is a schmitt trigger
input with 5-second input debounce time.
Operating mode selection input:
V
CC
: TRIAC/RELAY is always ON
7
7
7
7
7
7
MODE
I/O GND: TRIAC/RELAY is always OFF
Open: Auto detection, outputs 31.25Hz square
wave
8
8
8
8
8
8
Vcc
I
Positive power supply
Regulated voltage output The output voltage is
9
9
9
9
9
9
VEE
O
about 3.6V with respect to GND.
10
10
RSTB
I
Chip reset input, active low
-
-
-
-
-
-
10
10
CDSO
CDS control circuit output signal, active high
-
-
-
-
10
10
COMPO
output of comparator, active high
-
-
11
11
11
11
11
11
OP1P
I
Noninverting input of OP1
12
12
12
12
12
12
OP1N
I
Inverting input of OP1
13
13
13
13
13
13
OP1O
O Output of OP1
14
14
14
14
14
14
OP2P
I
Noninverting input of OP2, internal 1.8V default.
15
15
15
15
15
15
OP2N
I
Inverting input of OP2
16
16
16
16
16
16
OP2O
O Output of OP2
Note:
The active output width of COMPO is inversely proportional to the system frequency.
12-07-0006
3
PT0192-3
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Maximum Ratings
Storage temperature - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - -- - - - - -40° to +125°
C
C
Supply Voltage to Grourd Potential (Input & V
CC
Only) - - - - - -GND -0.5V to Vcc+0.5V
Supply Voltage to Grourd Potential (output & D/O Only)- - - - - GND -0.5V to Vcc+0.5V
DC Input Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -0.5V to + 6.0V
DC Output Current - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - 20mA
Power Dissipation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -500mW
Note:
Stresses greater than those listed under
MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating only
and functional operation of the device at these or
any other conditions above those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
reliability.
Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
F
SYS
T
A
Parameter
Operating Voltage
“H” Input Voltage
“L” Input Voltage
System Oscillator Frequency
Operating temperature
V
CC
-
-
-
5V
-
Test Condition
Condition
-
-
-
ROSCS=430K
COSCS=180P
-
Min.
4.75
0.8
-
12.8
-20
Typ.
5.0
-
-
16
25
Max.
6.0
-
0.2
19.2
70
Unit
V
V
CC
V
CC
KHz
°
C
Electrical Characteristics
Symbol
VTH1
VTL1
VTH2
VTL2
VTH3
VTL3
VTH4
VTL4
I
IH
I
IL
I
IHRSTB
IOH
IOL
IOH
IOL
Parameter
CDS “H” Transfer Voltage
CDS “L” Transfer Voltage
ZC “H” Transfer Voltage
ZC “L” Transfer Voltage
OSCS “H” Transfer Voltage
OSCS “L” Transfer Voltage
OSCD “H” Transfer Voltage
OSCD “L” Transfer Voltage
High level leakage current
(ZC,CDS)
Low level leakage current
(ZC,CDS)
RSTB Input high level current
Output source current(RELAY,
TRIAC)
Output sink current(RELAY,
TRIAC)
Output source
Current(CDSO,COMPO)
Output sink
current(CDSO,COMPO)
V
CC
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
Test Condition
Condition
Min.
3.0
0.9
2.6
1.1
2.7
0.8
2.7
0.8
V
IH
=4.5V
V
IL
=0.5V
V
IH
=4.5V
VOH=4.5V
VOL=0.5V
VOH=4.5V
VOL=0.5V
-1
-1
-1
–6
15
–5
5
Typ.
3.3
1.2
2.9
1.4
3
1
3
1
-
-
-
-
-
-
-
Max.
3.6
1.5
3.2
1.7
3.3
1.2
3.3
1.2
1
1
-5
-
-
-
-
Unit
V
V
V
V
V
V
V
V
A
A
A
mA
mA
mA
mA
12-07-0006
4
PT0192-3
07/06/12
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Voltage regulation circuit
Symbol
VEE
OP2P
V
O
V
LDR
Parameter
Regulator Output Voltage
Noninverting input of OP2
Line regulation
Load regulation
V
CC
5V
5V
-
5V
Test Condition
Condition
No load
No load
4.5V
CC
5.5V,
I
L
=1mA
0.5mA
I
L
2mA
Min.
3.24
1.62
-
-
Typ.
3.6
1.8
30
60
Max.
3.96
1.98
50
100
Unit
V
V
mV
mV
Operational amplifier and windows comparator
Symbol
BW
V
H
V
L
Description
3dB band width
Threshold of windows
comparator
Test condition
-
V
CC
=5V
V
CC
=5V
Min
10
1.8
1.35
TYP
-
2.0
1.5
Max
-
2.2
1.65
Unit
KHz
V
V
Frequency of oscillator and Timing of ZC and trigger output
Symbol
F
MODE
T
DZT
T
TPW
T
DZR
Description
Oscillator frequency/512
Delay time from ZC to TRIAC
TRIAC Pulse Width
Delay time from ZC rising edge
to Relay
Test condition
Min
25
1.16
50
-
Typ
31.25
1.45
62.5
125
Max
37.5
1.74
75
200
Unit
Hz
ms
s
s
V
CC
=5V, RS=430K ,CS=180P
(PT8A264X)
Power Dissipation
Symbol
I
CC
Description
Power supply current
Test condition
V
CC
=5V, R
S
=430K ,C
S
=180P,
R
D
=2M, C
D
=104, other Input
Pins=GND, all outputs float.
Min
-
Typ
120
Max
200
Unit
A
12-07-0006
5
PT0192-3
07/06/12
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