PT8A2641 Datasheet, PDF (1/13 Pages) Pericom Semiconductor Corporation – PIR Sensor Light Switch

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Product Features
 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.
PT8A2641-2642/2645-2648
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PIR Sensor Light Switch
Product Description
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
_
VEE
OSCD
OSCS
Comparator
Voltage
divider
Regulator
delay
oscillator
System
oscillator
latch circuit
Control
circuit
Delay
circuit
Frequency
divider
Mode and CDS
control circuit
Output
circuit
Zero cross
debounce
MODE
CDS
COMPO
CDSO
RSTB
RELAY
TRIAC
GND
Vcc
ZC
12-07-0006
PT0192-3 07/06/12
1