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PDF HT7612B Data sheet ( Hoja de datos )
| Número de pieza | HT7612B | |
| Descripción | General Purpose PIR Controller | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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HT7612/HT7612B
General Purpose PIR Controller
Features
· Operating voltage: 2.7V ~ 5.5V
· Standby current typical:
HT7612: 17mA
HT7612B: 19mA
· CDS input
· CDS debounce time:
HT7612: 15~20 seconds
HT7612B: < 3 seconds
· High noise immunity
Applications
· PIR light control
· Motion detectors
· 40 second power-on delay
· 10 second high speed warm-up for test mode
· 1~3783 second adjustable PIR turn on time.
· Output drive for Relay, TRIAC and LED
· Output drive buzzer alarm
· Low voltage detector
· Override function
· 16-pin DIP/NSOP packages
· Alarm system
· Auto door bells
General Description
The HT7612/HT7612B is PIR controller specifically de-
signed to interface to PIR sensors to implement motion
sensing application products such as intruder alarms.
The controller has the features of PIR sensitivity adjust-
ment and a CDS can be connected to the controller for
automatic detection. The HT7612/HT7612B is available
in low profile NSOP & DIP packages.
Selection Table
Part No.
HT7612
HT7612B
CDS Debounce Time
15~20 seconds
< 3 seconds
Block Diagram
O P 2O
O P 2N
O P 1O
O P 1N
O P 1P
A m p lifie r
C ir c u it
VDD VSS
C o m p a ra to r
C ir c u it
VREF
DT
T E S T /S C
LD O &
R e fe r a n c e V o lta g e
T im in g
D e la y
S y s ta m
O s c illa to r
C o n tro l
C ir c u it
B U Z /L V D
B U Z /C D S
R E L A Y /L E D
T R A IC
ZC
M ODE
Rev. 1.70
1 July 16, 2012
1 page  
HT7612/HT7612B
MODE
The MODE pin is a tristate input which is used to select the desired device operating mode.
MODE pin Operating
Status Mode
Description
VDD
ON
Output is always ON:
RELAY output high for RELAY driving.
TRIAC pulse train output is synchronised by ZC for TRIAC driving.
VSS
OFF
Output is always OFF:
RELAY output low for RELAY driving.
TRIAC output low for TRIAC driving.
OPEN
AUTO
Outputs remain in the OFF state until activated by a valid PIR input trigger signal. When
working in the AUTO mode, the devices allows for an override control by switching the ZC
signal.
The device also provides an additional test function on
the MODE pin. If the MODE pin is presented with a high
pulse, of greater than 400ms duration, within 1 second
after power-on, the device will be forced into its test
mode. When the device enters the test mode the
power-on delay time will be changed from its normal op-
erating value of 40 seconds to 10 seconds.
ZC
The ZC pin is a CMOS Schmitt trigger input pin. Using
suitable ZC signal switching, the device can provide the
following functions:
· Override control
When the device is operating in the AUTO mode,
which is when the MODE pin is open, the output will
be activated by a valid PIR trigger signal and the out-
put active duration will be controlled by a DT oscillat-
ing period. The mode can be switched from the AUTO
mode to the ²ON² mode by either connecting the
MODE pin to VDD or switching the ZC signal with an
OFF/ON operation of the power switch. The term
²override² refers to the change of operating mode by
switching the power switch. The device can be tog-
gled from ON to AUTO by an override operation. If the
device is overridden to ON and there is no further
override operations, it will automatically return to the
AUTO mode after 8 hours. It will flash 3 times at a 1Hz
rate when returning to the AUTO mode. But if the
AUTO mode is changed by switching the MODE
switch, it will not flash, as shown in Fig.5.
In Fig.6, an external pull-high resistor is required for nor-
mal applications.
V DD
2M W
1M W
AC
ZC
Fig.6 ZC Application Example
Note:
Regarding the priority of the MODE pin and the
ZC switching, note that when the MODE pin is
connected to VDD or VSS, the MODE state will
be determined by the MODE pin.
When the MODE pin is OPEN, the MODE state
will be determined by the ZC switching.
O p e r a tin g
M ode
ZC
A U TO
< 3sec
> 30m s
fla s h fla s h
ON
AUTO O N
A U TO
8hr < 8hr
Fig.5 ZC Override Timing
A lw a y s h ig h o r a lw a y s L o w
Rev. 1.70
5 July 16, 2012
5 Page 
· RELAY
HT7612/HT7612B
Note:
Adjust R9 to fit various CDS.
Adjust R6 to obtain the desired output duration.
Adjust R5 to change PIR sensitivity.
Change the value of C10 to 0.33mF/600V for AC 220V application.
Rev. 1.70
11
July 16, 2012
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet HT7612B.PDF ] | |
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