HOLTEK HT6P12

HT6P12
Learning Car Alarm Decoder
Features
•
•
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Operating voltage: 2.4V~5.2V
Low power consumption and high noise
immunity
Built-in oscillator needs only 5% resistor
Learning function
Maximum of 8 sets of customer codes can
be stored
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•
•
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2^24 information
3 local alarm trigger inputs: TRIG, AL+, ALACC can disarm whole car alarm system
Easy interface with RF or IR medium
Check received codes 3 times
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Car alarm system
Security system
Cordless telephones
Other remote control systems
Applications
•
•
•
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Burglar alarm system
Smoke and fire alarm system
Garage door controllers
Car door controllers
General Description
code and the last 4 bits as control signal data. If
the received 20 bits of customer code match the
bits of one of the stored customer codes in the
EEPROM after continuous checking three
times, the remaining 4-bit data are latched and
then the control function is executed.
The HT6P12 is a 24-bit decoder with a learning
function. It pairs with the HT6P20D encoder for
remote control system applications.
The HT6P12 can interface with HOLTEK’s
EEPROM (HT93LC46). When the data pins of
the HT6P20D (data negative polarity output
type) encoder is triggered from a range of 2^24
series, a complete remote car alarm system is
formed with the HT6P12. The decoder can store
8 sets of customer codes maximum at the learning mode. The first 20 bits of the received 24 bit
of information are interpreted as a customer
The HT6P12 incorporates five types of output
functions, namely arm/disarm, panic, find car,
mute, and On/Off. It, in addition, provides a
momentary data output for other user-defined
special purposes.
Pin Assignment
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HT6P12
Block Diagram
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2nd Oct ’97
HT6P12
Pad Assignment
Chip size: 2580 × 2580 (µm)2
* The IC substrate should be connected to VSS in the PCB layout artwork.
* The T4 pad must be bonded to VDD or VSS.
* Other test pad (T1~T3, T5~T9) must be floating.
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HT6P12
Unit: µm
Pad Coordinates
Pad No.
X
Y
Pad No.
X
Y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
–1113.4
–1113.4
–1113.4
–1113.4
–1113.4
–887.4
–707.5
–525
–336.2
–153.7
43.1
225.6
422.4
604.9
799.9
936
662.8
384
–598.5
–871.5
–1039.7
–1022.2
–1022.2
–1022.2
–1022.2
–1022.2
–1022.2
–1022.2
–1022.2
–1022.2
16
17
18
19
20
21
22
23
24
25
26
27
28
29
1108.4
1158.4
1109
1113.4
855.6
668.2
476.3
284.2
101.7
–95.1
–277.6
–469.7
–661.6
–849
–955.7
23
620.3
936.7
1032.2
1032.2
1032.2
1032.2
1032.2
1032.2
1032.2
1032.2
1032.2
1032.2
Pin Description
Pin Name
I/O
Internal
Connection
Description
LOCK
O
CMOS OUT Lock signal output pin to control an external lock, active high
UNLOCK
O
CMOS OUT Unlock signal output pin to control an external lock, active high
SIREN
(CHIRP)
O
CMOS OUT
ARM
O
CMOS OUT Arm state output pin, toggle function, active high
ON/OFF
O
CMOS OUT ON/OFF output pin for external control use, toggle function
Q3
O
CMOS OUT
VSS
—
—
Siren or chirp signal output pin to control an external siren
circuit, active high
Momentary data output pin for external control use, active
high
Negative power supply (GND)
Input:
CLEAR(CS)
I/O
CMOS I/O
All data in the EEPROM are erased if the
LEARN(LED) pin turns low and the CLEAR(CS) pin
turns high over 1 seconds, or if the CLEAR(CS) pin
turns high for over 1 seconds in the learning state.
Output: EEPROM chip selection signal output
(connected to the CS pin of EEPROM)
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2nd Oct ’97
HT6P12
Pin Name
I/O
Internal
Connection
Description
Input:
I/O
CMOS I/O
Pull-High
Selection of the siren and chirp sound function:
Hi or Open: Chirp and siren sounds enabled
Low: Chirp and siren sounds disabled
Output: Serial clock output for EEPROM
(connected to the SK pin of EEPROM)
TRIG
I
CMOS IN
Alarm trigger input pin in the arm state, high active
AL–
I
CMOS IN
Alarm trigger input pin in the arm state, low active
AL+
I
CMOS IN
Alarm trigger input pin in the arm state, high active
FLASH
O
RES
I
CMOS IN
VDD
—
—
Positive power supply
OSC
I
—
Oscillator input pin
DIN
I
CMOS IN
OPT1(SK)
CMOS OUT Flash output pin to control an external car lamp circuit
Input pin for resetting the chip inside, low active
Serial data input pin
Input:
LEARN(LED)
I/O
CMOS I/O
Pull-High
To set the chip into the learning state or to erase all
EEPROM data when used with the CLEAR(CS) pin,
low active
Output: To sink the LED current for indicating the function
state
Input:
OPT2(DO)
ACC(DI)
I/O
CMOS I/O
Pull-High
Selection of the car lamp flash function during alarm
Hi or Open: Lamp flash enabled
Low: Lamp flash disabled
Output: To activate the LED for indicating the function state
(refer to the function description)
This pin is also used to output the received data to
the EEPROM (connected to the DI pin of EEPROM)
I
CMOS IN
An active high signal to the ACC pin can disarm the alarm
system. This pin is also used to input data from the
EEPROM (connected to the DO pin of EEPROM)
Approximate internal connection circuits
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2nd Oct ’97
HT6P12
Absolute Maximum Ratings*
Supply Voltage ..............................–0.3V to 5.5V
Storage Temperature................. –50°C to 125°C
Input voltage ................. VSS–0.3V to VDD+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.
(Ta=25°C)
Electrical Characteristics
Symbol
Test Conditions
Parameter
VDD
Conditions
—
Min.
Typ.
Max.
Unit
2.4
5
5.2
V
VDD
Operating Voltage
—
IDD
Operating Current
5V
No land
FOSC=2MHz
—
1
2
mA
IOH1
Output Source Current
5V
VOH1=4.5V
–2
–3
—
mA
IOL1
Output Sink Current
5V
VOL1=0.5V
4
6
—
mA
VIH
“H” Input Voltage
5V
—
3.5
—
VDD
V
VIL
“L” Input Voltage
5V
—
0
—
1
V
RPH
Pull-High Resistance
5V
VIN=0V
10
30
50
kΩ
TKEY
LEARN and CLEAR Key
Debounce Time
—
FOSC=2MHz
—
20
—
ms
FOSC
Oscillator Frequency
5V
ROSC=200kΩ
—
2
—
MHz
Functional Description
(HT93LC46). It stores a maximum of 8 sets of
customer codes in the EEPROM, and contains
an option table which is written into the
EEPROM through HOLTEK’s tool.
The HT6P12 is a 24-bit decoder with a learning
function. It pairs with the HT6P20D (data
negative polarity output type) encoder for remote control system applications. The decoder
can interface with HOLTEK’s EEPROM
Option table
Option Items
Arm→Disarm Chirp Sound Times
Range
Default Values
1~4 times
2 times
Disarm→Arm Chirp Sound Times
1~4 times
1 time
Output Type Option
A, B, C (See the section
“Output function selection”)
A
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HT6P12
Option Items
Range
OFF time: (1~31)×40ms
ON time: (1~7)×40ms
Arm→Disarm, Disarm→Arm and
FIND_CAR Chirp Output Period
or Function Disabled
1~255 secs
Entry Delay Time
or Function Disable
1~255 secs
AL_TRIG Siren Active Time
or Function Disable
Default Values
OFF time: 240ms
ON time: 80ms
5 secs
10 secs
TRIG And Panic Siren Active Time,
One Interval
1~255 secs
TRIG Siren Pause Time
1~127 secs
10 secs
Enabled or Disabled
Enabled
In Mute Mode, Disarm→Arm Chirp Sound
or Function Disable
(1~15)× 4 secs
AUTO_ARM Delay Time
or AUTO_ARM Disabled
Max. Amount of TRIG Siren Active Cycle
1~14 or unlimited or disable
1~255 secs
RE_ARM Delay Time
or RE_ARM Disabled
Arm→Disarm, Disarm→Arm Lamp Flash
Period
OFF time: (1~15)×100ms
ON time: (1~15)×100ms
or Function Disabled
20 secs
Disabled
Unlimited
20 secs
OFF time: 600ms
ON time: 600ms
Arm→Disarm Lamp Flash Times
1~15 times
2 times
Disarm→Arm Lamp Flash Times
1~15 times
1 time
Alarm,Panic And FIND_CAR
Lamp Flash Period
Arm State LED Flash Period
States
OFF time: (1~15)×100ms
ON time: (1~15)×100ms
or Function Disabled
OFF time: (1~15)×100ms
ON time: (1~15)×100ms
or Function Disabled
Alarm State LED Flash Period
OFF time: (1~15)×100ms
ON time: (1~15)×100ms
or Function Disabled
LOCK Time
UNLOCK Time
FIND_TIME
(1~255)×100ms
or LOCK Disabled
(1~255)×100ms
or UNLOCK Disabled
1~255 secs
or FIND_CAR Disabled
7
OFF time: 300ms
ON time: 200ms
OFF time: 800ms
ON time: 200ms
OFF time: 300ms
On time: 100ms
2 secs
2 secs
3 secs
2nd Oct ’97
HT6P12
simultaneously pressing the LEARN and
CLEAR keys over 1 seconds (refer to the application circuits).
Power on initial
After power is supplied, the HT6P12 reads in a
value of an option parameter from the
EEPROM to decide the operation type as well
as the output format. If the option table is
empty or the option format is erroneous, the
HT6P12 will automatically load the internal
default value to replace the value of the option
table. The FLASH pin and the LED will also
output a flash signal warning. After the operation type and the output format are both set, the
decoder will check the customer code in the
EEPROM. If a customer code has been stored,
the HT6P12 will enter the idle state and go to
the arm state immediately. But if none of the
customer codes has been stored in the
EEPROM, the decoder will enter the waiting
state and the external LED will turn on (see the
application circuits) to indicate a waiting state.
Learning state
The HT6P12 enters the learning state from the
waiting or from the idle state if the
LEARN(LED) pin is active low over 1 seconds.
Then the LED output a flash signal at 1Hz rate
until a set of customer codes has been acquired
within 10 seconds (see the application circuits).
During the 10 seconds, if the DIN pin has received proper formatted data and no mistakes
have been made after 5 times continuous check,
the received customer code is stored in the
EEPROM and the LED pin stops flashing also.
After a customer code has been acquired, the
learning state is terminated and the system
goes to the idle state.
In contrast, during the 10 seconds if no
proper formatted data has been entered,
the LED pin will stop flashing and the decoder will return to its original state right
after the time is up. The HT6P12 can save
a maximum of 8 sets of customer codes in
t h e E E P R O M . O n ce t h e E E P R O M h a s
stored 8 sets of customer codes in it, the
decoder cannot enter the learning state unless the customer codes in the EEPROM
are all erased. In the learning state, all the
output pins are held low.
Waiting state
The HT6P12 enters the waiting mode after
power is turned on and none of the customer
codes has been saved in the EEPROM. In the
waiting state, the oscillator is activated, and
the HT6P12 is ready for receiving trigger signals from the LEARN(LED) pin. After the trigger signals have been received from the
LEARN(LED) pin, the decoder will go to the
learning state.
On the other hand, if trigger signals has not
been received from the LEARN(LED) pin, the
decoder will go to the arm state after
AUTO_ARM delay time. But, if the
AUTO_ARM function is disabled (i.e., the
AUTO_ARM delay time is zero, defined in the
option table), the decoder will stay on the waiting state till trigger signals been received from
the LEARN(LED) pin.
EEPROM erase function
When the LEARN(LED) pin turns low and the
CLEAR(CS) pin turns high over 1 second all
data in the EEPROM are erased. Once the
CLEAR and LEARN keys are released the LED
will automatically turn on.
Remote control mode
Idle state
In the idle state, if the HT6P12 has received
data from one of its paired encoders
(HT6P20D), it compares the received customer
code with one of the customer codes stored in
the EEPROM three times continuously. If the
received customer code matches one of the local
customer codes in the EEPROM after a three
times continuous check, the last 4 bits of the
The HT6P12 enters the idle state after the
EEPROM has stored one or more sets of customer codes in it. In the idle state, the HT6P12
is ready for receiving data from its paired encoder (HT6P20D) so as to trigger the DIN pin.
Or pressing the LEARN key enters the learning
state. Data in the EEPROM can be erased by
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2nd Oct ’97
HT6P12
same key of the encoder. But, if the arm and
disarm control signals are set as 2 different
data bits (Output Type B), the arm and disarm
states are separately controlled.
received 24 bits of customer code are interpreted as control signals.
Output function selection
After the disarm control signal has been received, and the LSI is in the arm state, the car
lamp will flash twice successively (defined by
the “Arm→Disarm lamp flash times” in the option table), the chirp sound will be output twice
continuously (defined by the “Arm→Disarm
chirp sound times” in the option table), the
UNLOCK pin will be active high, a duration
(defined by the “UNLOCK Time” in the option
table), the ARM pin will be active low, and the
alarm system will enter the disarm state. On
the other hand, after the arm control signal has
been received, the car lamp will flash once (defined by the “Disarm→Arm lamp flash times” in
the option table), the LED will flash at 1Hz rate
continuously (defined by the “Arm state LED
flash period”), the chirp sound will be output
once (defined by the “Disarm→Arm chirp sound
times” in the option table), the LOCK pin will
be active high, a daration (defined by the
“LOCK Time” in the option table), the ARM pin
will be active high, and the alarm system will
enter the arm state. In addition, the duty of the
chirp sound and lamp flash are both settable in
the option table.
When the last 4 bits (bits 21~24) of the received
24 bits of customer code are interpreted as 4
kinds of control signal outputs, each control
signal output controls an output function.
There are totally 8 kinds of output functions,
i.e., ARM/ DISARM, PANIC, ON/OFF, Q3,
ARM, DISARM, MUTE, and FIND_CAR, which
are further classified into three types A, B, and
C. Each type consists of 4 different output functions. The mapping of the last 4 bits to the 4
kinds of output functions is as shown.
The output type is defined by the option table.
Arm/Disarm control
If the arm and disarm control signals are set on
the same data bit (Output Type A or C), the arm
and disarm states are toggle-controlled by the
Fig.1 Arm/Disarm Timing
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2nd Oct ’97
HT6P12
of 4 intervals, the FLASH and SIREN outputs
will stop at the end of a cycle. Otherwise they
will continue to complete another cycle of 4
intervals. The total amount of cycle to be repeated can be set from 0 to 14 or unlimited
(defined by the “maximum amount of TRIG
SIREN active cycle” in the option table). After
the repeating times have been set, the FLASH
and SIREN output will stop at the end of the
assigned cycle although the trigger signal is
still not removed. Once the ACC (DI) pin is
activated the three kinds of output will cease.
In the disarm state, if the RE_ARM is enabled
(when the RE_ARM delay time is not zero; refer
to the option table for details), the disarm state
will change to the arm state after the RE_ARM
delay time. The timing of the arm/disarm control is shown in the previous page.
Mute mode
If one of the encoder’s data bits is set as a
MUTE control bit (Output Type B or C), its
function is similar to the function of the
arm/disarm control except that the chirp sound
is disabled in the mute mode (when the arm
state changes to the disarm state). In the mute
mode when the FIND_CAR function or the
alarm trigger is activated, the chirp sound will
be disabled. That is to say, only the car lamp will
flash in the FIND_CAR mode or the alarm trigger mode under the MUTE function. When the
disarm state changes to the arm state , the
chirp sound can be enabled or disabled (defined
by the “In mute mode, Disarm→Arm chirp
Sound” in the option table).
• AL+, AL- triggers
For the AL+ and AL- triggers, the AL+ is
activated at a high level and the AL- at a low
level. The LSI provides the following outputs:
♦
The FLASH pin will output a flash signal at
a settable rate (defined by the “ALARM,
Panic and FIND_CAR states lamp flash period” in the option table).
♦ The SIREN (CHIRP) pin will output a siren
sound. The active interval is settable (defined by the “AL_TRIG siren active time” in
the option table).
♦ The LED pin will output a flash signal. The
flash rate is settable (defined by the “Alarm
state LED flash period” in the option table).
The LED flash output will continue until
ACC(DI) pin is activated.
If the AL+ or AL- trigger signal is removed
within the AL_TRIG siren active time (defined by the “AL_TRIG siren active time” in
the option table), the FLASH and SIREN outputs will stop at the end of the active time.
Otherwise, the system will remain at the
alarm state, the AL_TRIG siren active time
will be re-loaded to count, and the FLASH and
SIREN outputs will continue until the signal
is removed within new active time or the ACC
(DI) is activated. Once the ACC (DI) pin is
activated the three kinds of pin output will
stop.
Alarm trigger mode (AL+, AL-, TRIG)
With an alarm in the arm state, any one of the
three signals AL+, AL-, and TRIG can trigger
the alarm as described below.
• TRIG trigger
For the TRIG trigger, the LSI provides the
following outputs:
♦
The FLASH pin will output a flash signal at
a settable rate (defined by the “Alarm,Panic
and FIND_CAR states lamp flash period” in
the option table).
♦ The SIREN (CHIRP) pin will output a siren
sound. The active interval is settable (defined by the “TRIG and Panic siren active
time” and the “TRIG siren pause time” in the
option table). Four intervals combined to produce a cycle.
♦ The LED will output a flash signal. The
flash rate is settable (defined by the “Alarm
state LED flash period” in the option table).
The LED flash output will continue until
ACC(DI) pin is activated.
If the TRIG trigger is removed within a cycle
The TRIG, AL+, and AL- triggers are all disabled in the disarm state. Once the active
high ACC(DI) input is activated, all the outputs will cease and the arm state will change
to the disarm state. When the ACC(DI) pin
return to low, if the AUTO_ARM is enabled
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2nd Oct ’97
HT6P12
will sound and the car lamp will flash. The
timing of the SIREN, FLASH, and LED outputs
is the same as the timing of the alarm trigger
mode. The active output length is on a par with
the TRIG siren active time, One interval (defined by the “TRIG and Panic siren active time”
in the option taable). The siren sound as well as
the car lamp flash can be interrupted by occurrence of a second panic control signal or by
activating the ACC (DI) pin. The panic mode
takes a priority of other modes.
(when the AUTO_ARM delay time is not
zero), the disarm state will change to the arm
state after the AUTO_ARM delay time (defined by the “AUTO_ARM delay time” in the
option table). The timing of the alarm trigger
is shown below.
Panic mode
Whether in the arm or disarm state, after a
panic control signal has been received, the siren
Alarm Triggers (AL+, AL-, TRIG) for Arm State
Note: During the Entry delay time, the chip ignores all trigger signals from the TRIG, AL+, AL- pins.
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2nd Oct ’97
HT6P12
On the other hand, if the ACC (DI) keeps at the
Hi-level, the LED flash output will continue.
Once the ACC (DI) detects a state transformation from Lo to Hi, the LED will turn off. The
timing is show below.
Once the Panic siren ends, the system will detect the state of the ACC (DI) pin.
If the ACC (DI) pin keeps at the Lo-level, the
system will automaticathy execute the Disarm→Arm control once and the LED flash output
will continue. Once the ACC(DI) pin detects a
state transformation from Lo to Hi, the LED
will turn off. The timing is shown below.
Find car mode
The HT6P12 enters the FIND_CAR mode when
Panic Timing
Panic Timing
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2nd Oct ’97
HT6P12
period of AL_TRIG siren active time, and the
system will enter the alarm trigger mode, and
the output of the SIREN, FLASH and LED is
the same as the timing of the alarm trigger
mode. To disable the output, the trigger signal
on the TRIG pin has to be removed or the
ACC(DI) pin be activated. The timing of the
door open is shown below.
one of the encoder’s data bits is set as a
FIND_CAR control signal (Output Type B or C).
Whether in the arm or disarm state, as long as
a FIND_CAR control signal has been received
from the DIN pin, the car lamp will flash and
the chirp will sound. The flash rate is identical
to those in the alarm trigger mode. The chirp
rate is defined by the “FIND CAR chirp output
period” in the option table. If the control signal
has been removed within the FIND_TIME (defined by the “FIND_TIME” in the option table),
the car lamp flashing and the chirp output will
stop at the end of the FIND_TIME. Otherwise
they will continue to complete another new
FIND_TIME period. If the encoder’s FIND_CAR
key is retriggered at this time the FIND_TIME
will be re-counted. But, if the FIND_CAR key is
triggered in the mute mode, the chirp function
will be disabled. The timing of the FIND_CAR
mode is shown below.
Alarm output (SIREN)
If the TRIG signal has been removed within a
cycle of four intervals, the siren will stop at the
end of the period. On the other hand, if the AL+
(AL-) signal has been removed within the period of the AL_TRIG siren active time, the siren
will also cease at the end of the period. Otherwise it will continue to complete another new
period.
The duration time of a cycle is decided by the
value of the option table. The alarm state is
terminated by the disarm control signal. After the
panic control signal has been received, the SIREN
(CHIRP) will output a period of time the same as
the TRIG siren active time. The alarm state can
be terminated by an active high ACC signal.
Door Open Alarm
If the TRIG pin is triggered and trigger signal
is held in the disarm state, the SIREN will not
be activated, and then the disarm state changes
to the arm state. HT6P12 will be active for a
Find Car Timing
Door Open Alarm
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2nd Oct ’97
HT6P12
“ALARM, Panic and FIND_CAR states lamp
flash period” in the option table.
When the SIREN enters the arm or disarm
state, it will output some pulses (defined by the
“Arm→Disarm chirp sound times” and the “Disarm→Arm chirp sound times” in the option table). The pulse width along with the pulse space
is decided by the option table. Except in the
panic trigger mode, the SIREN output can be
inhibited by setting the OPT1(SK) pin to be in
a low level before power is turned on (see the
application circuits).
This function can be inhibited by setting the
OPT2(DO) pin key to be in a low level before power
is turned on. (see the application circuits)
ACC input
Once the active high ACC (DI) input is activated, the car alarm system enters the disarm
state, and the arm/disarm, mute, and FIND_CAR
control signals as well as the TRIG, AL+, and ALtrigger signals all fail to be received. The PANIC,
LOCK/UNLOCK, Q3, ON/OFF, CLEAR, LEARN,
etc., control signals are still effective. But only the
external LED stops flashing.
LOCK/UNLOCK output
The LOCK and UNLOCK pins are not activated
at the initial power on. After the decoder enters
the arm state the LOCK pin will output a 2-second pulse (by default). The UNLOCK pin, on
the other hand, will output a 2-second pulse (by
default) when the decoder enters the disarm
state. The two pins cannot operate simultaneously. The LOCK pin takes a priority of the
UNLOCK pin. During the LOCK or UNLOCK
period, any control or trigger signals such as the
ARM, DISARM, MUTE, ACC, TRIG, etc., are
all disabled.
ARM output
When the HT6P12 operates in the arm state the
ARM pin outputs a “Hi” signal; otherwise it
outputs a “Lo” signal.
ON/OFF output
The LSI provides an external on/off toggle control when one of the data bits is set as an
ON/OFF control signal (Output Type A). The
ON/OFF timing is shown below.
The UNLOCK pin will output a 2-second pulse
each time the ACC (DI) pin receives a Hi to Lo
signal. The timing is shown in Fig.1.
FLASH output
The FLASH pin will output under the following
conditions:
• The LSI changes from the arm state to the
ON/OFF Timing
disarm state or from the disarm state to the
arm state. The flash rate is defined by the
“Arm→Disarm, Disarm→Arm lamp flash period” in the option table.
Q3 data output
Q3 is a momentary type of data output when
one of the data bits is set as Q3 (Output Type A).
This line is user-defined. The timing is shown
below.
• The LSI is in the alarm state. The flash rate
is defined by the “ALARM, Panic and
FIND_CAR states lamp flash period” in the
option table.
• The LSI has received a PANIC trigger signal.
The flash rate is defined by the “ALARM,
Panic and FIND_CAR states lamp flash period” in the option table.
• The LSI has received a FIND_CAR trigger
Q3 Timing
signal. The flash rate is defined by the
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2nd Oct ’97
HT6P12
Power-on initial flowchart
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2nd Oct ’97
HT6P12
Idle state flowchart
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2nd Oct ’97
HT6P12
Application Circuits
Note: Typical infrared receiver: PIC-12043T/PIC-12043S (DODESHI CORP.) or
LTM9052 (LITEON CORP.)
Typical RF receiver: JR-200 (JUWA CORP.)
The key resistance must be less than 200Ω when the LEARN key is pressed
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2nd Oct ’97