HT7611 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT7611

General Purpose PIR Controller

Holtek Semiconductor 

HT761X

Mask options

The HT761X offers mask options to select the

output flash (3 times) when changing the oper-

ating mode. The chip will flash 3 times at a 1Hz

rate each time it changes from AUTO to another

mode and flash 3 times at a 2Hz rate when it

returns to the AUTO mode. However the chip

will not flash if the mode is changed by switch-

ing the MODE switch.

• 4, 6, or 8 hour options to return to AUTO from

override ON. The default is 8 hours.

• Options for effective override: Once or twice

OFF/ON operation of power switch within 3

seconds. The default is OFF/ON twice.

• Options for output flash to indicate effective

override operation. The default is to flash.

• Options for effective PIR trigger pulse width:

>24mS, >32mS or >48mS. The default is 24ms.

• Options for setting comparator window to be

1

16

,

1

11.3

or

1

9

(VDD–VEE).

The

default

is

1

16

(VDD–VEE).

PIR amplifier

Consult the diagram below for details on the

PIR front end amplifier.

In Fig.5 there are 2 op-amps with different

applications. OP1 can be used independently as

a first stage inverting or non-inverting ampli-

fier for the PIR.

As the output of OP2 is directly connected to the

input of the comparator, it is used as a second

Fig. 5 PIR amplifier

stage amplifying device. The non-inverting in-

put of OP2 is connected to the comparator’s

window centerpoint and can be used to check

this voltage and to provide a bias voltage that is

equal to the centerpoint voltage of the compara-

tor. In Fig.5 the comparator can have 3 window

levels

set

by

mask

option.

1.

1

16

(VDD–VEE),

2.

1 (VDD–VEE), 3. 1 (VDD–VEE). If the win-

11.3

9

dow level fails to be specified the default win-

dow

is

set

to

1

16

(VDD–VEE).

The

preset

voltage

of VDD–VEE is 4V. The default values of VCP

and

VCN are therefore

0.25V,

(

4

16

V ).

9

24th Mar ’97

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