PT8A261P/261W/262P/262W
PIR Sensor Light Switch Controller
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Features
2-stage operational amplifier as filter
Built-in noise rejection circuit
On-chip regulator
Override function
Synchronous with AC 220V/50Hz and 110V/60Hz
Pulse output (PT8A261) for TRIAC drive or
level output (PT8A262) for relay drive
CDS to enable/disable output
Adjustable output on time duration
ON/AUTO/OFF selectable by MODE pin
Auto-reset if the ZC signal disappears over 3
seconds
40 seconds warm-up
Quick check mode for initial installation
Operating voltage: 5V
Stand-by current: 80A
Package:16-pin DIP (261P/262P) and 16-pin SOP
(261W/262W)
General Description
The PT8A261 and PT8A262 are low power mixed
signal CMOS LSI designed for the automatic lamp
control using PIR sensor as motion detector.
With on chip noise filter and voltage regulator, the IC
provides stable operations throughout temperature
range. CDS input to disable day time operation is
desired.
Applications
Energy saving auto-switch in Garden, kitchen,
bathroom, corridor, storage or yard
Auto light in meeting room
Block Diagram
Figure 1
OP2O
OP2N
OP2P
OP1O
OP1P
OP1N
OSCD
OSCS
ZC
MODE
CDS
RST
RELAY
(for 262 only)
TRIAC
(for 261 only)
Comparator
latch circuit
Mode and CDS
control circuit
Control
circuit
Voltage
divider
Regulator
delay
oscillator
System
oscillator
Counter
circuit
Delay
circuit
Zero cross
debounce
Output circuit
_
+
+
_
V
EE
Data Sheet
PT8A261/262
PIR Sensor Light Switch Controller
PT0075(04/03) Ver:5
2
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Pad Location
Pad Location of PT8A261DE
CDS
ZC
OSCS
MODE
V
CC
V
EE
RST
V
CC
NC
1470um
1710um
GND
TRIAC
OSCD
OP2P
OP2N
OP2O
OPIP OPIN OPIO
Die No.
Pad Coordinate
Pad Name
X Coordinate
Y Coordinate
Pad Name
X Coordinate
Y Coordinate
GND
570
65.4
NC
570
-268.6
TRIAC
570
-101.6
V
EE
-570
232.4
OSCD
570
399.4
RST
303.9
-687.2
OSCS
570
232.4
OP1P
-44.8
689.2
ZC
-378.8
689.2
OP1N
-211.8
689.2
CDS
-30.1
-687.2
OP1O
-570
-435.6
MODE
570
-435.6
OP2P
-570
-268.6
V
CC
-197.1
-687.2
OP2N
-570
-101.6
V
CC
136.9
-687.2
OP2O
-570
65.4
Note: Substrate is connected to GND
Data Sheet
PT8A261/262
PIR Sensor Light Switch Controller
PT0075(04/03) Ver:5
3
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Pad Location of PT8A262DE
Pad Coordinate
Pad Name
X Coordinate
Y Coordinate
Pad Name
X Coordinate
Y Coordinate
GND
570
65.4
NC
570
-268.6
RELAY
570
-101.6
V
EE
-570
232.4
OSCD
570
399.4
RST
303.9
-687.2
OSCS
570
232.4
OP1P
-44.8
689.2
ZC
-378.8
689.2
OP1N
-211.8
689.2
CDS
-30.1
-687.2
OP1O
-570
-435.6
MODE
570
-435.6
OP2P
-570
-268.6
V
CC
-197.1
-687.2
OP2N
-570
-101.6
V
CC
136.9
-687.2
OP2O
-570
65.4
Note: Substrate is connected to GND
CDS
ZC
OSCS
MODE
V
CC
V
EE
RST
V
CC
NC
1470um
1710um
GND
RELAY
OSCD
OP2P
OP2N
OP2O
OPIP OPIN OPIO
Die No.
Data Sheet
PT8A261/262
PIR Sensor Light Switch Controller
PT0075(04/03) Ver:5
4
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Pin Assignment
Figure 2
Pin Description
Table 1
Pin/Pad
Name
Type
Description
261
262
1
1
GND
Ground Ground
2
RELAY
O
RELAY drive output through an external NPN transistor, active high
2
TRIAC
O
TRIAC drive two-pulse output, active negative pulse.
3
3
OSCD
I/O
Output timing oscillator I/O, connected to an external RC to adjust output duration.
4
4
OSCS
I/O
System oscillator I/O, connected to an external RC to set the system frequency. The system
frequency = 16kHz for normal application.
5
5
ZC
I
Schmitt input for AC zero crossing detection.
6
6
CDS
I
Connected to a CDS voltage divider for daytime/night auto-detection. Low input to this pin
can disable PIR input. CDS is a schmitt trigger input with 5-second input debounce time.
7
7
MODE
I
Mode select, connecting to V
CC
- output always on, connection GND - output always off,
open - auto detection
8
8
V
CC
Power
Power supply
9
9
V
EE
O
Internal voltage regulator output, 3.6V with respect to ground. Connected to the drain of
PIR sensor
10
10
RST
I
Chip reset input, active low, kept floating or connected an RC network
11
11
OP1P
I
Non-inverted input of first operational amplifier, connected directly to source of PIR sensor
12
12
OP1N
I
Inverted input of first operational amplifier
13
13
OP1O
O
Output of first operational amplifier
14
14
OP2P
I
Non-inverted input of second operational amplifier.
15
15
OP2N
I
Inverted input of second operational amplifier
16
16
OP2O
O
Output of second operational amplifier
PT8A261P/PT8A261W
GND
TRIAC
1
OSCD
OSCS
ZC
MODE
V
CC
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
RST
V
EE
CDS
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Top view
PT8A262P/PT8A262W
GND
RELAY
1
OSCD
OSCS
ZC
MODE
V
CC
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
RST
V
EE
CDS
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Top view
Data Sheet
PT8A261/262
PIR Sensor Light Switch Controller
PT0075(04/03) Ver:5
5
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Functional Descriptions
The PT8A261 and PT8A262 are CMOS LSI chips designed for
automatic PIR lamp control. They can operate in 2-wire con-
figuration for triac applications or in 3-wire configuration for
relay applications.
The device consists of operational amplifiers, a comparator,
timer, a zero crossing detector, control circuit, a voltage regu-
lator, a system oscillator, and an output timing oscillator.
The PIR sensor detects infrared power variations caused by
motion of a human body and transfer to a voltage variation. If
the PIR output voltage variation conforms to criteria, the lamp
is turned on for an adjustable duration. The PT8A261 (or 262)
offers three operating modes (ON, AUTO, OFF) which can be
set through a MODE pin. When the device is working in AUTO
mode, the user can override the mode to switch it to TEST
mode or manual ON mode, or return to the AUTO mode by
switching power switch.
OSCS and OSCD
Pins
OSCS is a system oscillator I/O pin connected to an external
RC to generate system frequency of 16kHz.
OSCD is an output timing oscillator I/O pin. It's connected to
an external RC to obtain the desired turn-on duration by se-
lecting various values of RC or using a variable resistor.F
OSCD
is the frequency of OSCD pin, output timing can be caculated
as the formula:
T
D
= 21504/F
OSCD
CDS Input Circuit
CDS is a CMOS schmitt trigger input pin. It is used to distin-
guish between day time and night time. When the input volt-
age of CDS is high the PIR input is enabled, when CDS low the
PIR input disabled. The input disable-to-enable debounce
time is 5 seconds. Connect this pin to V
CC
when not using it.
The CDS input is ignored when the TRIAC or RELAY output
is active.
Figure 4. Output Timing Oscillator
Figure 5. CDS Input Circuit
CDS
Rp
V
CC
CDS
Schmitt
Driver
PT8A261/262
Control
Circuit
CDS
Figure 3. System Oscillator
OSCD
C
D
R
D
560K
200P
C
S
R
S
PT8A261/
262
OSCS
PT8A261/
262
T
D
= 21504/F
OSCD
CDS
PIR
Disable
Enable
< 5s
> 5s
Enable
Figure 6. CDS Enable Debounce
CDS
Status
PIR
LOW
Day Time
Disabled
HIGH
Night
Enabled
Table 2. CDS Pin Function
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