PT8A2641 Datasheet, PDF (3/13 Pages) Pericom Semiconductor Corporation – PIR Sensor Light Switch

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Pin Description
PT8A2641-2642/2645-2648
PIR Sensor Light Switch
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Part number
2641 2642 2645 2646 2647 2648 ^{Pin name I/O}
Description
1
1
1
1
1
1
GND
I Ground
-
2
-
2
-
2
RELAY
O
RELAY drive output through an external NPN
transistor, active high
2
-
2
-
2
-
TRIAC
O
TRIAC drive to output two negative pulses, active
negative pulse.
Output timing oscillator I/O
3
3
3
3
3
3
OSCD I/O It is connected to an external RC to adjust output
duration.
System oscillator I/O OSCS is connected to an
4
4
4
4
4
4
OSCS I/O external RC to set the system frequency. The
system frequency =16KHz for normal application.
5
5
5
5
5
5
ZC
I Schmitt input for AC zero crossing detection
CDS is connected to a CDS voltage divider for
6
6
6
6
6
6
CDS
I
daytime/night auto-detection. Low input to this pin
can disable the PIR input. CDS is a schmitt trigger
input with 5-second input debounce time.
Operating mode selection input:
V_CC: TRIAC/RELAY is always ON
7
7
7
7
7
7
MODE I/O GND: TRIAC/RELAY is always OFF
Open: Auto detection, outputs 31.25Hz square
wave
8
8
8
8
8
8
Vcc
I Positive power supply
9
9
9
9
9
9
VEE
O
Regulated voltage output The output voltage is
about 3.6V with respect to GND.
10
10
-
-
-
-
RSTB I Chip reset input, active low
-
-
10
10
-
-
CDSO
CDS control circuit output signal, active high
-
-
-
-
10
10 COMPO
output of comparator, active high
11
11
11
11
11
11
OP1P
I Noninverting input of OP1
12
12
12
12
12
12
OP1N I Inverting input of OP1
13
13
13
13
13
13
OP1O O Output of OP1
14
14
14
14
14
14
OP2P
I Noninverting input of OP2, internal 1.8V default.
15
15
15
15
15
15
OP2N I Inverting input of OP2
16
16
16
16
16
16
OP2O O Output of OP2
Note: The active output width of COMPO is inversely proportional to the system frequency.
12-07-0006
PT0192-3 07/06/12
3