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HT7612 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT7612 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 23 page  HT7612/HT7612B Rev. 1.70 6 July 16, 2012 CDS The CDS pin is connected to an internal comparator input. It is used to allow the device to distinguish between day and night conditions. When the CDS input voltage is lower than VL, the PIR amplifier circuit will be disabled and the TRIAC and RELAY output pins will be inactive. When the input voltage of the CDS is higher than VL, the outputs are both active. The debounce time for the CDS pin for switch- ing the outputs from an inactive to an active state is about 15~20 seconds for the HT7612 and less than 3 seconds for the HT7612B. Connect this pin to VDD when this func- tion is not used. The CDS timing is shown in Fig.7 CDS Status Output Low Day Time Disabled High Night Enabled In Fig.8, RCDS and RY can be adjusted to obtain the de- sired daytime detection level. LED The LED pin is a CMOS output pin which is used as a valid trigger indicator. When the TRIAC/RELAY is acti- vated, this pin will be active until the TRIAC/RELAY has is switched OFF. The LED pin structure is shown in Fig.9. LVD LVD is a low voltage detector. When the detected volt- age is lower than 1.1V, the LED flicker and the buzzer will emit a tone. In Fig10, assume RX,RLVD can be adjusted to obtain the desired voltage detection level. OP2 OP1 Regulator Comp1 Comp2 S D G VH VL VM VREF VL VH VM PIR Sensor Output Comparator Input VL VH VREF VREF PIR Amplifier C D S T R I A C & R E L A Y A c t i v e I n a c t i v e A c t i v Fig.7 CDS Timing B U Z / C D S V R E F V L T E S T / S C R C D S R Y Fig.8 CDS Application Example 1 k 9 T r i g g e r I n d i c a t o r R E L A Y / L E D Fig. 9 LED Pin Drive LED B U Z / L V D V D D 1 . 1 V T E S T / S C R X R L V D Fig.10 LVD Application Example |
Similar Part No. - HT7612_12 |
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Similar Description - HT7612_12 |
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