HT761X
General Purpose PIR Controller
Selection Table
Part Number
ZC off/on for
override
Flash on
mode auto-
change
Override ON
duration
Comparator
window
Effective
trigger width
HT7610
2 times
Flash
8 hrs
1
16
(V
DD
-V
EE
)
>24ms
HT7611
1 time
No flash
8 hrs
1
16
(V
DD
-V
EE
)
>24ms
Features
·
Stand-by current: 100
µ
A (Typ.)
·
On-chip regulator
·
Adjustable output duration
·
CDS input
·
40 second warm-up
·
ON/AUTO/OFF selectable by MODE pin
·
Override function
·
Auto-reset if the ZC signal disappears over
3 seconds
·
Operating voltage: 5V~12V
·
16 pin DIP or SOP packaging
General Description
The HT761X is a CMOS LSI chip designed for
use in automatic PIR lamp control. It can oper-
ate with a 2-wire configuration for triac applica-
tions or with a 3-wire configuration for relay
applications. The chip is equipped with opera-
tional amplifiers, a comparator, timer, a zero
crossing detector, control circuit, a voltage regu-
lator, a system oscillator, and an output timing
oscillator.
Its PIR sensor detects infrared power vari-
ations induced by the motion of a human body
and transforms it to a voltage variation. If the
PIR output voltage variation conforms to the
criteria (refer to the functional description), the
lamp is turned on with an adjustable duration.
The HT761X offers three operating modes (ON,
AUTO, OFF) which can be set through the
MODE pin. While the chip is working in the
AUTO mode the user can override it and switch
to the TEST mode, or manual ON mode, or
return to the AUTO mode by switching the
power switch. The chip is enclosed in a 16 pin
DIP/SOP.
Applications
·
PIR light controllers
·
Motion detectors
·
Alarm systems
·
Auto door bells
1
24th Mar '97
Pin Assignment
Block Diagram
HT761X
2
24th Mar '97
Pin Description
Pin No.
Pin Name
I/O
Internal
Connection
Description
A
B
1
1
VSS
I
--
Negative power supply
2
RELAY
O
CMOS
RELAY drive output through an external NPN
transistor, active high
2
TRIAC
O
CMOS
TRIAC drive output
The output is a pulse output when active.
3
3
OSCD
I/O
PMOS IN
NMOS OUT
Output timing oscillator I/O
It is connected to an external RC to adjust output
duration.
4
4
OSCS
I/O
PMOS IN
NMOS OUT
System oscillator I/O
OSCS is connected to an external RC to set the
system frequency. The system frequency
16KHz
for normal application.
5
5
ZC
I
CMOS
Input for AC zero crossing detection
6
6
CDS
I
CMOS
CDS is connected to a CDS voltage divider for
daytime/night auto-detection. Low input to this pin
can disable the PIR input. CDS a schmitt trigger
input with 5-second input debounce time.
7
7
MODE
I
CMOS
Operating mode selection input:
VDD: Output is always ON
VSS: Output is always OFF
Open: Auto detection
8
8
VDD
I
--
Positive power supply
9
9
VEE
O
NMOS
Regulated voltage output
The output voltage is about 4V with respect to
VDD.
10
10
RSTB
I
Pull-High
Chip reset input, active low
11
11
OP1P
I
PMOS
Noninverting input of OP1
12
12
OP1N
I
PMOS
Inverting input of OP1
13
13
OP1O
O
NMOS
Output of OP1
14
14
OP2P
I
PMOS
Noninverting input of OP2
15
15
OP2N
I
PMOS
Inverting input of OP2
16
16
OP2O
O
NMOS
Output of OP2
HT761X
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24th Mar '97
Absolute Maximum Ratings
Supply Voltage ............................... 0.3V to 13V
Operating Temperature............... 25
°
C to 75
°
C
Input Voltage................. V
SS
0.3V to V
DD
+0.3V
Zero Crossing Current.....................max. 300
µ
A
Storage Temperature ................. 50
°
C to 125
°
C
Electrical Characteristics
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
DD
Condition
V
DD
Operating Voltage
--
--
5
9
12
V
V
EE
Regulator Output Voltage
12V
V
DD
V
EE
3.5
4
4.5
V
I
DD
Operating Current
12V
No load, OSC on
--
100
350
µ
A
V
TH1
CDS "H" Transfer Voltage
12V
--
6.4
8
9.6
V
V
TL1
CDS "L" Transfer Voltage
12V
--
3.7
4.7
5.6
V
I
OH1
OUTPUT Source Current
(RELAY, TRIAC)
12V
V
OH
=10.8V
6
12
--
mA
I
OL1
OUTPUT Sink Current
(RELAY, TRIAC)
12V
V
OL
=1.2V
40
80
--
mA
I
OL2
VEE Sink Current
12V
V
DD
V
EE
=4V
--
1
--
mA
V
IH
"H" Input Voltage
--
--
0.8V
DD
--
--
V
V
IL
"L" Input Voltage
--
--
--
--
0.2V
DD
V
V
TH2
ZC "H" Transfer Voltage
12V
--
4.7
6.7
8.7
V
V
TL2
ZC "L" Transfer Voltage
12V
--
1.3
1.8
2.3
V
F
SYS
System Oscillator Frequency
12V
R
OSCS
=560K
C
OSCS
=100P
12.8
16
19.2
KHz
F
d
Delay Oscillator Frequency
12V
R
OSCD
=560K
C
OSCD
=100P
12.8
16
19.2
KHz
A
VO
OP Amp Open Loop Gain
12V
No load
60
80
--
dB
V
OS
OP Amp Input Offset Voltage
12V
No load
--
10
35
mV
HT761X
4
24th Mar '97
Trigger Timing
Note: 1. The output is activated if the trigger signal conforms to the following criteria:
·
More then 3 triggers within 2 seconds.
·
A trigger signal sustain duration
0.34 secs.
·
2 trigger signals within 2 secs with one of the trigger signal sustain
0.16 secs.
2. The effective comparator output width can be selected to be 24ms or 32ms or
48ms by mask option. The default is 24ms (system frequency=16KHz).
3. The output duration is set by an external RC that is connected to the OSCD pin.
HT761X
5
24th Mar '97
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