Pin Assignment

Pin Description

Pin Name

I/O

Mask

Option

Description

OP1P

I

PMOS

OP1 Non-inverting Input

OP1N

I

PMOS

OP1 Inverting Input

OP1O

O

CMOS

OP1 Output

OP2N

I

PMOS

OP2 Inverting Input

OP2O

O

CMOS

OP2 Output

VREF

O

NMOS

Reference Voltage

DT

I

PMOS

Delay time oscillator input. Connected to an external RC to adjust the output dura-

tion.

TEST/SC

O

CMOS

TEST and SC share the same pin.

TEST is used to test the 32 Khz system frequency.

SC is used to detect LVD and CDS.

VSS

¾¾

Negative power supply, ground

VDD

¾¾

Positive power supply

RELAY/LED

O

CMOS

RELAY and LED share the same pin.

Active high - a RELAY is driven through an external NPN transistor.

BUZ/CDS

I/O

CMOS

BUZ and CDS share the same pin.

The BUZ output can drive a piezo buzzer.

CDS is connected to a CDS voltage divider for daytime/night auto-detection. A low

input to this pin can disable the PIR input. CDS is connected to the input of a internal

comparator with a debounce time of 15~20 seconds for the HT7612 and less than 3

seconds for the HT7612B.

BUZ/LVD

I/O

CMOS

BUZ and LVD share the same pin.

The BUZ output can drive a piezo buzzer

LVD is used as an input low voltage detector.

ZC

I

¾

AC zero crossing detector input.

TRIAC

O

CMOS

TRIAC output drive. The output is a pulse output when active.

MODE

I

CMOS

Operating mode selection input.

VDD: Output is always ON

VSS: Output is always OFF

Open: Auto detection

Test Mode Input.

HT7612/HT7612B

Rev. 1.50

2

February 21, 2011

H T 7 6 1 2 / H T 7 6 1 2 B

1 6 D I P - A / N S O P - A

T E S T / S C

Z C

B U Z / L V D

B U Z / C D S

M O D E

R E L A Y / L E D

T R I A C

V D D

O P 1 P

O P 1 N

O P 1 O

O P 2 N

O P 2 O

V R E F

D T

V S S

1 6

1 5

1 4

1 3

1 2

1 1

1 0

9

1

2

3

4

5

6

7

8