HT6P12-20 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT6P12-20

Learning Car Alarm Decoder

Holtek Semiconductor 

HT6P12

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 con-

trol 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 trig-

ger 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).

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 (de-

fined by the “TRIG and Panic siren active

time” and the “TRIG siren pause time” in the

option table). Four intervals combined to pro-

duce 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

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 re-

peated 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.

• 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 pe-

riod” in the option table).

♦ The SIREN (CHIRP) pin will output a siren

sound. The active interval is settable (de-

fined 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 (de-

fined by the “AL_TRIG siren active time” in

the option table), the FLASH and SIREN out-

puts 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.

The TRIG, AL+, and AL- triggers are all dis-

abled in the disarm state. Once the active

high ACC(DI) input is activated, all the out-

puts 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

10

2nd Oct ’97

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