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HT7611 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT7611 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 11 page  Functional Description VEE VEE supplies power to the analog front end circuit with a stabilized voltage which is –4V with respect to VDD normally. OSCS OSCS is a system oscillator input pin. When it is connected to an external RC a system fre- quency of 16KHz can be generated. OSCD OSCD is an output timing oscillator input pin. It’s connected to an external RC to obtain the desired output turn-on duration. Variable out- put turn-on durations can be achieved by select- ing various values of RC or using a variable resistor. RELAY (TRIAC) RELAY is an output pin set as a RELAY driving (active high) output for the HT761XA, or as a TRIAC driving (active low) output for the HT761XB. The output active duration is controlled by the OSCD oscillating period. HT761XA HT761XB OUTPUT RELAY TRIAC CDS CDS is a CMOS schmitt trigger input structure. It is used to distinguish between day time and night time. When the input voltage of CDS is high the PIR input is enabled. On the other hand, when CDS is low the PIR input is dis- abled. The input disable to enable debounce time is 5 seconds. Connect this pin to VDD when not using this function. The CDS input is ignored when the output is active. CDS Status PIR LOW Day Time Disabled HIGH Night Enabled Fig.1 System oscillator TD= 1 f × 21504 Fig.2 Output timing oscillator HT761X 6 24th Mar ’97 |
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Similar Description - HT7611 |
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