HT6P12-20 データシートの表示（PDF） - Holtek Semiconductor

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HT6P12-20

Learning Car Alarm Decoder

Holtek Semiconductor 

HT6P12

received 24 bits of customer code are inter-

preted as control signals.

Output function selection

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 func-

tions. 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

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.

After the disarm control signal has been re-

ceived, 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 op-

tion 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 (de-

fined 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.

Fig.1 Arm/Disarm Timing

9

2nd Oct ’97

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