HT7612_12 Datasheet, PDF (2/23 Pages) Holtek Semiconductor Inc – General Purpose PIR Controller

HT7612/HT7612B
Pin Assignment
O P 1P 1
O P 1N 2
O P 1O
3
O P 2N 4
O P 2O
5
VREF 6
DT 7
VSS 8
1 6 T E S T /S C
15 ZC
1 4 B U Z /L V D
1 3 B U Z /C D S
12 M O D E
1 1 R E L A Y /L E D
1 0 T R IA C
9 VDD
H T 7 6 1 2 /H T 7 6 1 2 B
1 6 D IP -A /N S O P -A
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
TEST and SC share the same pin.
O CMOS TEST is used to test the 32 Khz system frequency.
SC is used to detect LVD and CDS.
VSS
¾
VDD
¾
RELAY/LED O
BUZ/CDS I/O
BUZ/LVD I/O
ZC
I
TRIAC
O
MODE
I
¾
¾
CMOS
CMOS
CMOS
¾
CMOS
CMOS
Negative power supply, ground
Positive power supply
RELAY and LED share the same pin.
Active high - a RELAY is driven through an external NPN transistor.
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 and LVD share the same pin.
The BUZ output can drive a piezo buzzer
LVD is used as an input low voltage detector.
AC zero crossing detector input.
TRIAC output drive. The output is a pulse output when active.
Operating mode selection input.
VDD: Output is always ON
VSS: Output is always OFF
Open: Auto detection
Test Mode Input.
Rev. 1.70
2
July 16, 2012