HT7612 查看數據表（PDF） - Holtek Semiconductor

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HT7612

General Purpose PIR Controller

Holtek Semiconductor 

HT7612/HT7612B

Effective Trigger Timing

The effective input trigger signal width should be ³ 24ms. The output is valid either with (1) trigger signal width ³ 0.5

seconds or (2) more than 2 effective trigger inputs within 2 seconds (separation of 2 triggers ³ 0.5s). The separation

time between two TRIAC(RELAY) turn-on time must be more than 1 sec. The trigger timing is shown in Fig.11.

Fig.11 Trigger Timing

Retrigger

When the output of the comparator is a valid signal, the RELAY/TRIAC will be activated and the active duration is con-

trolled by the DT oscillating period. If the previous ²Delay Time tD² has not been exceeded and the next valid signal oc-

curs again, the active duration of the RELAY/TRIAC will be restarted. The timing is shown in Fig.12.

Fig.12 Retrigger

Rev. 1.50

7

February 21, 2011

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