HT6280.PDF
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HT6280
Car Alarm Decoder
Features
·
Operating voltage: 3V~5V
·
3 local alarm trigger inputs:
–
TRIG, AL+, AL-
·
Low power consumption and high noise
immunity CMOS technology
·
Valid transmission indicator (LED)
·
Built-in oscillator needs only 5% resistor
·
ACC disarms the whole car alarm system
3
12
trinary address codes
·
·
Easy interface with RF or IR medium
·
6 decoder control data outputs
General Description
The HT6280 is an 18-bit decoder CMOS LSI
designed for use in remote control car alarm
system. When complemented by one of the TE
triggered HT600/HT640/HT680 or DATA trig-
gered HT6187/HT6207/HT6247 encoder ICs
from a range of 3
18
series of encoders, a com-
plete remote car alarm system can be formed.
The details on the 3
18
encoders can be found in
the relevant databook encoder section.
After receiving the 18 bits of information from
the encoder the HT6280 interprets the first 12
bits as address and the last 6 bits as control
signal data. If these received 12 bits of address
matches that of the locally set address then the
6 data bits are latched and the control function
executed. Three types of control function are
incorporated in the device, these are arm/dis-
arm, panic and power on/off. The HT6280 also
provides 3 momentary data outputs for other
user defined special purposes.
1
2nd Oct ’97
HT6280
Pin Assignment
2
2nd Oct ’97
HT6280
Block Diagram
Pin Description
HT6280 — 40 Pins
Pin No. Pin Name I/O
Internal
Connection
Description
1
OSC2
I
OSCILLATOR Oscillator output pin
2
DIN
I
CMOS IN
Serial data input pin
3~5
NC
—
—
No connection
6~17
A0~A11
I
TRANSMISSION
GATE
A0~A11 address inputs
They can be set to VDD, VSS, or floating.
18~20
D15~D17 O
CMOS OUT
D15~D17 momentary data outputs from D15~
D17 of an encoder, for external control use
21
ON/OFF
O
CMOS OUT
ON/OFF output pin for external control use
Toggle outputs of the ON/OFF pin are triggered
by D14 of an encoder
3
2nd Oct ’97
HT6280
Pin No. Pin Name I/O
Internal
Connection
Description
22
RESET
I
CMOS IN
System reset pin
23
TEST
O
CMOS OUT
For IC testing only
24
ACC
I
CMOS IN
Pull-Low
An active high signal to the ACC pin disarms the
alarm system
25,26
NC
—
—
No connection
27
VDD
I
—
Positive power supply
28
LOCK
O
CMOS OUT
Lock signal output to control external lock/unlock,
active high
29
LED
O
NMOS OUT
LED indicator for arm/disarm, alarm, and panic
30
UNLOCK O
CMOS OUT
Unlock signal output to control external
lock/unlock, active high
31
FLASH
O
CMOS OUT
Flash output pin to control external car lamp
circuit, active high
32
SIREN
O
CMOS OUT
Alarm output pin to control external siren circuit,
active high
33
TRIG
I
CMOS IN
Pull-High
Alarm trigger input in the arm state, active high
34
AL-
I
CMOS IN
Pull-High
Alarm trigger input in the arm state, active low
35
AL+
I
CMOS IN
Pull-Low
Alarm trigger input in the arm state, active high
36
ARM
O
CMOS OUT
Arm state output, active high
This pin is toggled by D12 of an encoder
37
OPT2
I
CMOS IN
Pull-High
Car lamp flash selection during alarm:
VSS: Lamp flash
VDD or Open: Lamp flash disabled
38
VSS
I
—
Negative power supply (GND)
39
OPT1
I
CMOS IN
Pull-High
Chirp sound selection during change of
arm/disarm states:
VSS: Chirp
VDD or Open: Chirp disabled
40
OSC1
I
OSCILLATOR Oscillator input pin
4
2nd Oct ’97
HT6280
Approximate internal connection circuits
Absolute Maximum Ratings*
Supply Voltage ............................. –0.3V to 5.5V
Storage Temperature................. –50
°C to 125°C
Input Voltage.................... V
SS
–0.3 to V
DD
+0.3V
Operating Temperature............... –20
°C to 75°C
*Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only. Functional operation of this device at
these or any other conditions above those indicated in the operational sections of this
specification is not implied and exposure to absolute maximum rating conditions for extened
periods may affect device reliability.
Electrical Characteristics
(Ta=25
°C)
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
V
DD
Supply Voltage
—
—
3
—
5
V
I
STB
Standby Current
5V
Oscillator stops
—
2
4
mA
I
DD
Operating Current
5V
No load
F
OSC
=100kHz
—200
400
mA
PH
Pull-High Resistance
5V
V
IN
=0V
—
150
—
k
W
R
PL
Pull-Low Resistance
5V
V
IN
=5V
—
150
—
k
W
I
OUT1
Output Current
(D15~D17)
Source 5V
V
OUT
=0.9V
DD
–0.3
–0.6
—
mA
Sink
5V
V
OUT
=0.1V
DD
0.5
1
—
mA
I
OUT2
Output Current
(ON/OFF)
Source 5V
V
OUT
=0.9V
DD
–0.7
–1.2
—
mA
Sink
5V
V
OUT
=0.1V
DD
0.5
1
—
mA
5
2nd Oct ’97
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