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HT7611B Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT7611B Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
5 / 13 page HT7610A/HT7610B/HT7611A/HT7611B Rev. 1.60 5 March 21, 2013 ZC ZC is a CMOS input structure. It receives AC line fre- quency and generates zero crossing pulses to synchro- nize the triac driver. By effective ZC signal switching (switch OFF/ON 1 or 2 times within 3 seconds by mask option), the chip provides the following additional func- tions: · Test mode control Within 10 seconds after power-on, effective ZC switching will force the chip to enter the test mode. During the test mode, the outputs will be active for a duration of 2 seconds each time a valid PIR trigger signal is received. If a time interval exceeds 32 sec- onds without a valid trigger input, the chip will auto- matically enter the AUTO mode. · Override control When the chip is working in an AUTO mode (MODE=open), the output is activated by a valid PIR trigger signal and the output active duration is con- trolled by an OSCD oscillating period. The lamp can be switched always to ²ON² from the AUTO mode by either switching the MODE pin to VDD or switching the ZC signal by an OFF/ON operation of the power switch (OFF/ON once or twice within 3 seconds by mask option). The term ²override² refers to the change of operating mode by switching the power switch. The chip can be toggled from ON to AUTO by an override operation. If the chip is overridden to ON and there is no further override operation, it will auto- matically return to AUTO after an internal preset ON time duration has elapsed. This override ON time du- ration is 8 hours. The chip provides a mask option to determine the out- put flash times (3 times) when changing the operating mode. It will flash 3 times at a 1Hz rate each time the chip changes from an AUTO mode to another mode or flash 3 times at a 2Hz rate when returning to the AUTO mode. But if the AUTO mode is changed by switching the MODE switch it will not flash. RST RST is used to reset the chip. It is internal pull-high and active low. The use of CRST can extend the power-on initial time. If the RST pin is an open circuit (without CRST), the initial time is the default (40 secs). Power-on Initial The PIR signal amplifier requires a warm up period after power-on. The input should be disabled during this period. In the AUTO mode within the first 10 seconds of power-on initialization, the chip allows override control to enter the test mode. After 40 seconds of the initial time the chip allows override control between ON and AUTO. It will remain in the warm up period if the total ini- tial time has not elapsed after returning to AUTO. In case that the ZC signal disappears for more than 3 seconds, the chip will restart the initialization operation. However, the restart initial time is always 40 seconds and cannot be extended by adding CRST to the RST pin as shown in the Fig.1. Mask Options The HT761x offers mask options to select the output flash (3 times) when changing the operating 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 switching the MODE switch. · Options for effective override: Once or twice Off/On op- eration of power switch within 3 seconds. Once for HT7611A/HT7611B and twice for HT7610A/HT7610B. · Options for output flash to indicate effective override operation. Flash for HT7610A/HT7610B and no flash for HT7611A/HT7611B. Z C A U T O O N A U T O A U T O O p e r a t i n g M o d e 8 h o u r s O N f l a s h f l a s h f l a s h f l a s h ZC Override Timing R E S T R S T 1 0 0 m F C R S T V C C V E E V D D Fig.1 RST Application Example |
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Similar Description - HT7611B |
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