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參數(shù)資料
| 型號： | UAA4713FP |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | MOTION DETECTOR INTERFACE |
| 中文描述： | 運(yùn)動檢測器接口 |
| 文件頁數(shù)： | 6/14頁 |
| 文件大小： | 323K |
| 代理商： | UAA4713FP |
SYSTEM DESCRIPTION
(seeFunctionalDiagram)
If a heat source moves in front of the IR-detector,
the sensor delivers a quasi sinusoidal AC-signal
in the
μ
V to mV range. The operational amplifier
amplifies the sensor signal by 72dB.
To reject an unwantedsignal, a band pass filter is
needed. If the AC-level at pin 14 exceedsthe win-
dow comparator thresholds, the programmable
timer will start. To suppress short sensor signals,
a 50ms time filter is implemented between the
window comparator output and the programmable
timer. This functionimproves the noise immunity.
After the reset of the timer a second timer will pro-
vide a 600ms dead time to prevent retriggering of
the timer. This function avoids restarting of the
timer, when the turned off lamp temperature. de-
creases
The lamp switched by the triac can be located
closeto the sensor.
To avoid circuit operation during day-time, a
photo resistor (LDR) senses the light intensity and
switches off the circuit. The capacitor at pin 2 pre-
vents circuit start-up during short shadowphases,
when a personpasses by the sensor.
From the analog input pin 1 via the AD-converter
the on-time duration can be programmed in 7
steps (see t
TIM
table in the electical charac-
teristics). The timer is clocked by the mains fre-
quency.
Two outputs for various applications are avail-
able.
Pin5 is the triggeroutput for triacgate.
Pin 4 output can be used to switch a relay or
otherloads.
The zero crossing detector provides the firing
pulse for the triac at the right time, shortly after
the zero crossingof the AC-signal.
The RC-network at pin 7 supplies current to the
circuit via a double wave rectification which is pro-
vided by a split power supply. Due to the capaci-
tive energy transfer into pin 7, the circuit will also
be suppliedwith current if the triac is fired. A short
wire for circuit supply is not needed.
The circuit works similar to a simple two-terminal
switch and can be installed in parallel with ordi-
nary mechanicalpulse switches (fig. 4).
After a short supply connection via an external
pulse switch, the circuit timer will also start with-
out a sensor signal.
Therefore the circuit can also be used as an ordi-
nary light timer without the IR-movingsensor fea-
ture.
Figure4
Figure5:
DifferentPossibleFilter Solutions
UAA4713
6/14
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