HT6P12 datasheet(13/17 Pages) HOLTEK

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Door Open Alarm

Find Car Timing

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 (de-

fined 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.

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

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.

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 pe-

riod of the AL_TRIG siren active time, the siren

will also cease at the end of the period. Other-

wise 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.

HT6P12

2nd Oct ’97

HT6P12 Datasheet(PDF) 13 Page - Holtek Semiconductor Inc

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