WT8076S16P1 데이터 시트보기 (PDF) - Weltrend Semiconductor
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WT8076S16P1 Datasheet PDF : 8 Pages
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eltrend
WT8076
Passive Infrared (PIR) Controller
CDS Interface
The CDS interface detects the level on the CDS pin. If the level is higher than 1.95V, it is night time.
If the level is lower than 1.25V, it is day time.
Operating Modes
The operating modes of WT8076 are:
(1) Auto mode:
The light will turn on when a valid pulse is detected in the night time.
(2) Always on mode:
If the ND pin is low level, the light is always on in the night time. When it detects day time, the
light will be turn off, and back to auto mode.
If the ND pin is high level, the light is always on.
(3) Walk-test mode:
The walk-test mode is active after the power is on. This mode is same as the auto mode except
the CDS is ignored. That is, the light will be turn on when a valid pulse is detected no matter it is
night time or day time.
Remote Control
To switch auto mode between always on mode, the WT8076 detects the zero crossings of the AC line. If
the line switch OFF and ON one time in 3 seconds, it toggles the auto mode and always on mode.
Time Base
The RC oscillator on the TB pin generates the system clock. The frequency is 30kHz typically (R
=30Kohm, C=1000pF) .
The following parameters are decided by the time base :
(1) Trigger angle of the TRIAC (24O , if time base is 30kHz).
(2) Pulse width (90ms,if time base is 30kHz).
(3) Remote control switch time.
(4) Disable PIR after the light is off.
(5) Total walk-test time.
The RC oscillator on the TCI pin sets the delay time. Figure 2 shows the relationship betwteen delay
time and the R ( C=1000pF).
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