Data Sheet
PT8A2612
PIR Sensor Light Switch Controller
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Features
•
General Description
The PT8A2612 is a CMOS LSI chip based on 260
base designed for use in automatic PIR lamp control.
It can operate with a 2-wire configuration for triac
applications with dimmer function or 3-wire
configuration for RELAY application.
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 can softly turn on
as the below order, 25% lighteness, 50%, 75% 100%
as well as turn off as reverse order with an adjustable
duration.
The PT8A2612 offers three operating modes (TEST,
AUTO, disable dimmer) which can be set through
the MODE pin. While the chip is working in the AUTO
mode the user can override it and switches to the
quickly check mode, or manual ON mode, or return
to the AUTO mode by switching the power switch.
2-stage operational amplifier as filter
• Built-in noise rejection circuit
• On-chip regulator
• Override function by twice turn-off and -on of AC
power
• 4s soft start and 1 minutes soft stop by three
steps with 5 minutes hold time at f
OSCD
= 1Hz
• 40 second warm-up
• Turn on 25% during night without motion
• Mode pin to set test mode, disable dimmer or
auto mode
• Auto-reset if the ZC signal disappears over 3
seconds
•
•
•
•
•
•
Quickly check mode for installation
Synchronous with AC 220V/50Hz and 110V/60Hz
Output pulse for triac drive and level for relay
CDS to enable/disable output
Adjustable output on time duration
Operating voltage: 5V
• Average supply current: 80µA (Typ.)
Ordering Information
Part Number
PT8A2612P
PT8A2612W
PT8A2612DE
Package
16 - Pin PDIP
16 - Pin SOP
Die Form
Applications
• Energy saving auto-switch in Garden, kitchen,
bathroom, corridor, storage, and yard
• Auto light in Meeting-room
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Data Sheet
PT8A2612
PIR Sensor Light Switch Controller
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Block Diagram
OP2O
OP2N
OP2P
_
Comparator
+
Voltage
divider
+
_
Regulator
GND
V
EE
Power up reset
OSCD
delay
oscillator
Delay circuit
V
CC
Control
circuit
Output circuit
RELAY
TRIAC
latch circuit
Mode and CDS
control circuit
MODE
CDS
OP1O
OP1P
OP1N
OSCS
System
oscillator
Counter
circuit
Zero cross
debounce
ZC
PT0122(04/03)
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Data Sheet
PT8A2612
PIR Sensor Light Switch Controller
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Pad Location
1710um
OSCD TRIAC GND OP2O OP2N OP2P
OP1O
1470um
OP1N
OSCS
ZC
CDS
MODE V
CC
V
CC
V
EE
RELAY
OP1P
NC
Die No.
Pad Coordinate
Pad Name
X Coordinate
Y Coordinate
570
570
570
-44.8
-211.8
-378.8
-570
-570
-570
Pad Name
V
EE
RELAY
NC
OP1P
OP1N
OP1O
OP2P
OP2N
OP2O
X Coordinate
268.6
435.6
--
687.2
687.2
687.2
435.6
268.6
101.6
Y Coordinate
-570
-570
--
-30.1
136.9
303.9
570
570
570
GND
-65.4
TRIAC
-232.4
OSCD
-399.4
OSCS
-689.2
ZC
-689.2
CDS
-689.2
MODE
-232.4
V
CC
-101.6
V
CC
65.4
Note: Substrate is connected to GND
PT0122(04/03)
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Ver:0
Data Sheet
PT8A2612
PIR Sensor Light Switch Controller
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Pin Assignment
PT8A2612P/W
GND
TRIAC
OSCD
OSCS
ZC
CDS
MODE
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OP2O
OP2N
OP2P
OP1O
OP1N
OP1P
RELAY
V
EE
Top view
Pin Description
Pin No.
1
2
3
4
5
6
Pin/Pad Name
GND
TRIAC
OSCD
OSCS
ZC
CDS
Type
Ground Ground
O
I/O
I/O
I
I
TRIAC drive output:
active negative pulse
Output timing
oscillator I/O: connected to an external RC to adjust output duration
System oscillator I/O:
connected to an external RC to set the system frequency. The
system frequency = 16kHz for normal application
Schmitt input for AC zero crossing detection
Analog Schmitt, 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.
Operating mode selection input:
V
CC
: TEST mode for customer to quickly check function
GND: disable dimmer function
Open: Auto detection, MODE is square wave with 31.25Hz
Power supply
Internal voltage regulator output:
3.6V with respect to ground. Connected to the
drain of PIR sensor
RELAY driver output,
active high
Non-inverted input of first operational amplifier, connected directly to source of PIR
sensor
Inverted input of first operational amplifier
Output of first operational amplifier
Non-inverted input of second operational amplifier, internal 1.8V default
Inverted input of second operational amplifier
Output of second operational amplifier
Description
7
MODE
I/O
8
9
10
11
12
13
14
15
16
PT0122(04/03)
V
CC
V
EE
RELAY
OP1P
OP1N
OP1O
OP2P
OP2N
OP2O
Power
O
O
I
I
O
I
I
O
4
Ver:0
Data Sheet
PT8A2612
PIR Sensor Light Switch Controller
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Functional Description
CDS
CDS
LOW
HIGH
Power On Initial
The PIR signal amplifier requires a warm up period after power-
on. The input should be disabled during this period, mean-
while, TRIAC and RELAY output will hold on in order to
indicator system has been power on.
In the AUTO mode within the first 10 seconds of power-on
initialization, the chip allows override control to enter the
quickly check mode. After 40 seconds of the initial time the
chip allows override control between ON and AUTO. It will
remain in the warm up period if the total initial time has not
elapsed after returning to AUTO.
MODE Operation
MODE
status
V
CC
GND
Operating
Mode
TEST mode
DIMMER
disable
AUTO
Status
Day Time
Night
CDS_EN
inactive
active
In case that the ZC signal disappears more than 3 seconds, the
chip will restart the initialization operation.
MODE
The operation modes of PT8A2612 is shown in the following
table.
Override function
By effective ZC signal switching (switch OFF/ON twice within
3 seconds), the chip provides the following additional func-
tions:
Quick check mode:
Within 10 seconds after power-on, effec-
tive ZC switching will force the chip to enter the quickly check
mode. During the mode, the outputs will be active for duration
of 2 seconds each time a valid PIR trigger signal is received. If
a time interval exceeds 32 seconds without a valid trigger
input, the chip will return to the AUTO mode automatically.
Functions
TRIAC pulse train output will turn on 2 seconds once detecting an active motion
Remove the dimmer function. In case that the chip allows override control by switching the ZC
signal.
TRIAC output can soft start when activated by a valid PIR input trigger signal. TRIAC output
can also soft stop when timing is elapsing. When working in the AUTO mode, the chip
allows override control by switching the ZC signal too.
Open
Figure 1. Quick Check Mode
10s
RST
40s warm up time
ZC
<3s
Test enable
comparator
output
Relay
(Triac)
OFF
>0.34s
*
ON
2s
2s
ON
2s
ON
2s
2s
ON
2s
>32s
*
*: Flach 3 times at 2Hz rate on TRIAC pin
PT0122(04/03)
Ver:0
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