PT8A2620
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PIR Sensor Light Switch Controller
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
Lead free DIP-16 and SOIC-16 package
Application
Energy saving auto-switch in Garden, kitchen,
bathroom, corridor, storage or yard
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.
Block Diagram
V
CC
V
EE
OP1O
OP1P
OP1N
Regulator
CDS
RELAY
+
_
OP1
Comparator
VCP
+
-
&
VCN
+
-
Control
Circuit
POR
ON
RST
OP2O
OP2N
OP2P
-
+
OP2
HT
GND
PWD
12-07-0006
1
PT0119-4
07/06/12
PT8A2620
PIR Sensor Light Switch Controller
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Pin Configuration
OP1P
OP1N
OP1O
OP2O
OP2N
OP2P
RSTB
GND
1
2
3
4
5
6
7
8
16 VEE
15 ON
14 POR
PT8A2620
13 HT
12 PWD
11 VCC
10 RELAY
9 CDS
Pad location
PT8A2620DE
OP1N
OP1P
VEE
ON
OP1O
POR
OP2O
HT
950um
OP2N
PWD
OP2P
AVDD
RSTB
VSS
CDS
VDD
RELAY
Y
X
1310um
Pad name
OP1P
OP1N
OP1O
OP2O
OP2N
OP2P
RSTB
VSS
X coordinate
429.00
150.10
150.10
150.10
150.10
150.10
150.10
569.50
Pad Coordinate
Y coordinate
PAD name
747.50
VEE
736.60
ON
639.60
POR
542.60
HT
445.60
PWD
384.60
AVDD
253.40
VDD
113.00
RELAY
CDS
X coordinate
648.20
1009.80
1009.80
1009.80
1009.80
1009.80
1009.80
1009.80
736.70
Y coordinate
747.50
720.20
623.20
526.20
431.00
332.20
237.00
138.20
113.00
Note: Substrate is connected to VSS
12-07-0006
2
PT0119-4
07/06/12
PT8A2620
PIR Sensor Light Switch Controller
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Pin and Pad Description
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
OP1P
OP1N
OP1O
OP2O
OP2N
OP2P
RSTB
GND
CDS
RELAY
VCC
PWD
HT
POR
ON
VEE
Pad
Name
OP1P
OP1N
OP1O
OP2O
OP2N
OP2P
RSTB
VSS
CDS
RELAY
AVDD
VDD
PWD
HT
POR
ON
VEE
I/O
I
I
O
O
I
I
I
-
I
O
-
I/O
I/O
I
I
O
Description
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
Inverting input of second operational amplifier
Noninverting input of second operational amplifier, internal 1.8V default.
Reset input, active low.
Ground
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 VCC 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
12-07-0006
3
PT0119-4
07/06/12
PT8A2620
PIR Sensor Light Switch Controller
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Maximum Ratings
Storage Temperature ................................................................................... -40oC to +125oC
Supply Voltage to Ground Potential (Input & V
CC
Only).........................-0.5V to+6.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ...................-0.5V to+6.0V
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 condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Typ
5.0
25
Max
6.0
70
Unit
V
°
C
Recommended operation conditions
Sym
V
CC
T
A
Parameter
Operating Voltage
Operating temperature
Min
4.75
-25
DC Electrical Characteristics
Description
Test Conditions
Min
Type
Input high leakage current
-1
-
(ON,POR, CDS)
I
IH
V
IH
=4.5V
Input high leakage current (RSTB)
-6
-
Input low leakage current
-1
-
(ON,POR, CDS)
I
IL
V
IL
=0.5V
Input low leakage current (RSTB)
-15
-
Output Sink Current(HT)
30
-
I
OL
Output Sink Current(PWD)
V
OL
=0.5V
10
-
Output Sink Current(RELAY)
5
-
I
OH
Output Source Current (RELAY)
V
OH
=4.5V
–10
-
V
TH1
“H” Transfer Voltage (POR,CDS,PWD,HT)
3.0
3.3
-
V
TL1
“L” Transfer Voltage (POR,CDS,PWD,HT)
1.4
1.7
-
V
TH2
“H” Transfer Voltage (ON)
2.7
3.0
-
V
TL2
“L” Transfer Voltage (ON)
1.6
1.9
-
V
TH3
“H” Transfer Voltage (RSTB)
2.8
3.1
-
V
TL3
“L” Transfer Voltage (RSTB)
1.4
1.7
-
Note: These specifications apply for VCC = 5.0V and -25 oC TA
70 oC, unless otherwise specified.
Symbol
Max
1
-1
1
-8
-
-
-
-
3.6
2.0
3.3
2.2
3.4
2.0
Unit
A
A
A
A
mA
mA
mA
mA
V
V
V
V
V
V
AC Electrical Characteristics
Voltage regulation circuit
Symbol
V
EE
V
OP2P
V
O
V
LDR
I
L
Parameter
BW
V
TH
V
TL
Power Dissipation
Symbol
I
CC
12-07-0006
4
Description
Power supply current
Test condition
V
CC
=5V, other Input Pins=GND-, all output
floating.
Min
-
Typ
-
Max
200
PT0119-4
Unit
A
07/06/12
Parameter
Regulator Output Voltage
Noninverting input of OP2
Line regulation
Load regulation
Regulator Output current
Description
3dB band width
Threshold of windows
comparator
Test Condition
No load
No load
4.5V
CC
5.5V,
I
L
=1mA
V
CC
=5V, 0.5mA
I
L
2mA
V
CC
=5V
Test condition
-
V
CC
=5V
V
CC
=5V
Min.
3.2
1.5
-
-
4
Min
10
1.9
1.4
Typ.
3.6
-
-
-
-
TYP
-
2.05
1.55
Max.
4.0
2.0
100
30
-
Max
-
2.2
1.7
Unit
V
V
mV
mV
mA
Unit
KHz
V
V
Operational amplifier and windows comparator
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.
Power on Reset (POR)
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 VCC to disable this feature.
Force On Function
Trigger Timing
RSTB
RST
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.
PT8A2620
&
ON
POR
RST
CDS
Comparator
Input
Comparator
Output
An active pulse width
&
PWD
HT
ON
POR
RELAY
Hold
time
power on reset
time 40s
+trigger level
-trigger level
Threshold
Threshold
Threshold
12-07-0006
5
PT0119-4
07/06/12
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