Data Sheet

PT8A2611/2621

PIR Sensor Light Switch Controller

PT0091(04/03)

Ver:3

4

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Pin Assignment

Pin Description

Pin

Name

Type

Description

2611

2621

1

1

GND

Ground Ground

2

RELAY

O

RELAY drive output through an external NPN transistor, active high

2

TRIAC

O

TRIAC drive two-pulse output, active negative pulse.

3

3

OSCD

I/O

Output timing oscillator I/O, connected to an external RC to adjust output duration.

4

4

OSCS

I/O

System oscillator I/O, connected to an external RC to set the system frequency. The system

frequency = 16kHz for normal application.

5

5

ZC

I

Schmitt input for AC zero crossing detection.

6

6

CDS

I

Connected to a CDS voltage divider for daytime/night auto-detection. Low input to this pin

can disable PIR input. CDS is a schmitt trigger input with 5-second input debounce time.

7

7

MODE

I

Mode select, connecting to V

CC

- output always on, connection GND - output always off,

open - auto detection

8

8

V

CC

Power

Power supply

9

9

V

EE

O

Internal voltage regulator output, 3.6V with respect to ground. Connected to the drain of

PIR sensor

10

10

RST

I

Chip reset input, active low, kept floating or connected an RC network

11

11

OP1P

I

Non-inverted input of first operational amplifier, connected directly to source of PIR sensor

12

12

OP1N

I

Inverted input of first operational amplifier

13

13

OP1O

O

Output of first operational amplifier

14

14

OP2P

I

Non-inverted input of second operational amplifier.

15

15

OP2N

I

Inverted input of second operational amplifier

16

16

OP2O

O

Output of second operational amplifier

PT8A2611P/PT8A2611W

GND

TRIAC

1

OSCD

OSCS

ZC

MODE

V

CC

OP2O

OP2N

OP2P

OP1O

OP1N

OP1P

RST

V

EE

CDS

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Top view

PT8A2621P/PT8A2621W

GND

RELAY

1

OSCD

OSCS

ZC

MODE

V

CC

OP2O

OP2N

OP2P

OP1O

OP1N

OP1P

RST

V

EE

CDS

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Top view