WT8076

Passive Infrared (PIR) Controller

Weltrend Semiconductor Inc.

2

eltrend

PIN DESCRIPTION

Pin No.

N16P1

S16P1

N18P1

Name

Descriptions

1

13

1

UOU1

Output of the first stage OP amplifier.

2

14

2

NII1

Non-inverting input of the first stage OP amplifier.

3

15

3

II1

Inverting input of the first stage OP amplifier.

4

16

4

VREF

Reference voltage output.

5

1

5

GND

Ground.

6

2

6

TB

Time Base. A RC oscillaror is connected on this pin.

Typical frequency is 30kHz.

7

3

7

---

No connection.

8

4

8

TCI

Time control input. A RC oscillator is connected on this

pin. It controls the delay time of the light.

9

5

9

TRIAC

Triac control pin. Active low.

10

6

10

RELAY

Relay control pin. Active hight.

11

7

11

ZCD

Zero-crossing input. It detects the zero-crossing point of

the AC line. The ouput of TRIAC pin is synchronous to this

pin.

*

*

12

WKT

Walk-Test function enable/disable. Internal pull low. The

walt-test function is disbled when this pin is high level.

*

*

13

ND

Night and day detection enable/disable. Internal pull low.

The night-and-day detection is disbled when this pin is

high level.

12

8

14

VDD

Power supply.

13

9

15

CDS

Connect a photo-sensitive resistor to detect night time

and day time. If the input level is lower than 1.2V, it is

day time. If the input level is higher than 1.9V, it is night

time.

14

10

16

II2

Inverting input of the second stage OP amplifier.

15

11

17

NII2

Non-inverting input of the second stage OP amplifier.

16

12

18

UOU2

Output of the second stage OP amplifier.

* WT8076N16P1 and WT8076S16P1 : Walk-Test and Night&Day function is always enabled.