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PIR Sensor Light Switch

12-07-0006

PT0192-3

07/06/12

1

PT8A2641-2642/2645-2648

Product Features

Product Description

 Operating voltage: 5V (Typ.)

 Average supply current: 120µA (Typ.)

 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.

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

OP1O

OP1P

OP1N

OSCD

OSCS

ZC

RSTB

Vcc

GND

RELAY

MODE

CDS

TRIAC

Comparator

latch circuit

Mode and CDS

control circuit

Control

circuit

Voltage

divider

Regulator

delay

oscillator

System

oscillator

Frequency

divider

Delay

circuit

Zero cross

debounce

Output

circuit

_

+

+

_

VEE

COMPO

CDSO