Data Sheet
PT8A2620
PIR Sensor Light Switch Controller
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Features
• 2-stage operational amplifier for filter
• CDS to disable output during daytime
• Timings are fully adjustable with external RC
components
• High level output for relay and triac drive with
optical-coupler
• Built-in noise rejection circuit
• On-chip regulator
• Force on function
• Both AC and DC operating
• Operating voltage: 5V
• Few external components
General Description
The PT8A2620 is a CMOS mixed signal LSI designed
for low cost applications using PIR as motion sensor.
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. CDS can enable or disable output
with external voltage divider.
Applications
• Energy saving auto-switch in Garden, kitchen,
bathroom, corridor, storage or yard
Ordering Information
Pa r t Nu m b er
PT8A2620P
PT8A2620W
Pa ck a ge
16 - Pin PDIP
16 - Pin SOP
Block Diagram
V
CC
V
EE
OP1O
OP1P
OP1N
Regulator
CDS
RELAY
+
_
OP1
Comparator
VCP
-
+
OP2
+
-
&
VCN
+
-
HT
Control
Circuit
POR
ON
RST
OP2O
OP2N
OP2P
GND
PWD
PT0119(03/03)
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Ver:2
Data Sheet
PT8A2620
PIR Sensor Light Switch Controller
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Pin Configuration
PT8A2620P/W
OP1P
OPIN
OP1O
OP2O
OP2N
OP2P
RST
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
EE
ON
POR
HT
PWD
V
CC
RELAY
CDS
Top view
Pin Description
P in
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Na me
OP1P
OP1N
OP1O
OP2O
OP2N
OP2P
RST
GND
CDS
RELAY
V
CC
PWD
HT
POR
ON
V
EE
Typ e
I
I
O
O
I
I
I
Descr ip t ion
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
Output of second operational amplifier
Inverted input of second operational amplifier
Non-inverted input of second operational amplifier. Internal bias on 1.8V default.
Reset input, active low.
Ground Ground
I
O
Power
I/O
I/O
I
I
O
Schmitt, connected to a CDS voltage divider for daytime/night auto-detection. Low input to
this pin can disable PIR input. CDS should be connected to V
CC
when not using this function.
RELAY drive output through an external NPN transistor, active high. The output active
duration is controlled by the HT pin
Power supply
Schmitt input/open drain output, pulse width detection*
Schmitt input/open drain output, hold time, external RC to set output ON time duration.
Use a VR to make variable ON time.
Power on reset, reset the chip in about 40s after power on with an external RC.
Schmitt, force on control input, active low.
Internal voltage regulator output, 3.6V with respect to ground. Connected to the drain of
PIR sensor
* An active motion must meet certain condition. The chip transfers motion to pulse width signal, so an active motion must
meet a preset pulse width. Pulse width is adjustable by external RC.
PT0119(03/03)
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Ver:2
Data Sheet
PT8A2620
PIR Sensor Light Switch Controller
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Functional description
Pulse width detection (PWD) or Noise rejection circuit
Pulse width detection can be used to filter the noise in order to
prevent error trigger from the system. The default criteria of
the width must be more than 400ms which can be set with an
external RC.
Hold time (HT)
Hold time, in other word, the output active duration, it can be
set with an external RC. One various resistor can be used to
changed the related output duration.
Force on function
The IC can force the controlled lamp to on state by turning off
the power supply for a brief period of time. During this brief
power interruption, the power to the IC must be maintained.
Shown in the schematic, with ON input discharged to low
while RST maintains at high, the lamp output can be set to on
until a RST input is low (longer period of power down). This
feature may cause not intended lamp on situation during brief
power interruption. Tie ON to V
CC
to disable this feature.
Trigger Timing
Force On Function
PT8A2620
&
ON
&
POR
RST
Power on Reset (POR)
The external PIR sensor requires a period of up to 40 seconds
to stabilize, so a power on reset circuit is required to ensure
proper operations. During this power on reset period, the lamp
is on to indicate proper operation.
Retrigger
If another PIR signal is attained with valid duration, the circuit
will be retriggered, and the hold time will be restarted from
this time.
RST
CDS
Comparator
Input
Comparator
Output
An active pulse width
+trigger level
-trigger level
PWD
Threshold
HT
Hold
time
Threshold
ON
power on reset
time 40s
POR
RELAY
Threshold
PT0119(03/03)
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Ver:2
Data Sheet
PT8A2620
PIR Sensor Light Switch Controller
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Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested)
Note:
Stresses greater than those listed under MAXIMUM
Storage Temperature ...................................................... -40
o
C to +125
o
C
RATINGS may cause permanent damage to the
Supply Voltage to Ground Potential (Inputs & V
CC
Only) .... -0.3 to +6.0V
device. This is a stress rating only and functional
Supply Voltage to Ground Potential (Outputs & D/O Only) -0.3 to +6.0V operation of the device at these or any other condi-
DC Input Voltage ................................................................ -0.3 to +6.0V tions above those indicated in the operational sec-
DC Output Current ........................................................................ 20mA tions of this specification is not implied. Exposure
Power Dissipation ....................................................................... 500mW to absolute maximum rating conditions for ex-
tended periods may affect reliability.
Recommended Operation Conditions
Sym
V
CC
T
A
Descr ip t ion
Supply Voltage
Operation Temperature
Min
4.75
-25
Typ
5.0
25
Ma x
6.0
70
Un it s
V
O
C
DC Electrical Characteristics
Sym
Descr ip t ion
Input high leakage current
(POR, CDS, ON)
Input high leakage current (RST)
Input low leakage current
(POR, CDS, ON)
Input low leakage current (RST)
I
OH
OUTPUT Source Current (RELAY)
OUTPUT Sink Current (HT)
I
OL
OUTPUT Sink Current (PWD)
OUTPUT Sink Current (RELAY)
V
TH1
V
TL1
V
TH2
V
TL2
V
TH3
V
TL3
"H" Transfer Voltage
(POR, CDS, PWD, HT)
"L" Transfer Voltage
(POR, CDS, PWD, HT)
"H" Transfer Voltage (ON)
"L" Transfer Voltage (ON)
"H" Transfer Voltage (RST)
"L" Transfer Voltage (RST)
-
-
-
-
-
-
V
OL
= 0.5V
V
OH
= 4.5V
Test C on d it ion s
Min
-1
V
IH
= 4.5V
-6
-1
V
IL
= 0.5V
-15
-10
30
10
5
3.0
1.4
2.7
1.6
2.8
1.4
-
-
-
-
-
3.3
1.7
3.0
1.9
3.1
1.7
-8
-
-
-
-
3.6
2.0
3.3
2.2
3.4
2.0
µΑ
mA
mA
mA
mA
V
V
V
V
V
V
-
-
-1
1
µΑ
µΑ
Typ
-
Ma x
1
Un it s
µΑ
I
IH
I
IL
Note:
These specifications apply for V
CC
= 5.0V and -25
O
C
≤
T
A
≤
70
O
C, unless otherwise specified.
PT0119(03/03)
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Ver:2
Data Sheet
PT8A2620
PIR Sensor Light Switch Controller
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AC Electrical Characteristics
Voltage Regulator
Sym
V
EE
V
OP2P
∆V
Ο
∆V
LDR
I
L
Descr ip t ion
Regulator Output Voltage
Noninverting input of OP2
Line Regulation
Load Regulation
Regulator Output Current
Test C on d it ion s
No load
No load
4.5V
≤
V
CC
≤
5.5V, I
L
= 1mA
V
CC
= 5V, 0.5mA
≤
I
L
≤
2mA
V
CC
= 5V
Min
3.2
1.5
-
-
4
Typ
3.6
-
-
-
-
Ma x
4.0
2.0
100
30
-
Un it s
V
V
mV
mV
mA
Operational Amplifier and Window Comparator
Sym
BW
V
TH
V
TL
Descr ip t ion
3dB Bandwidth
Windows Comparator Threshold
Test C on d it ion s
-
V
CC
= 5V
V
CC
= 5V
Min
10
1.9
1.4
Typ
-
2.05
1.55
Ma x
-
2.2
1.7
Un it s
kHz
V
V
Power Dissipation
Sym
Descr ip t ion
Test C on d it ion s
V
CC
= 5V,
other input pins = GND,
all outputs float
Min
Typ
Ma x
Un it s
I
CC
Power Supply Current
-
-
200
µA
PT0119(03/03)
5
Ver:2
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