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WT8072 Datasheet Preview

WT8072 Datasheet

PIR CONTROLLER

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WT8072
PIR CONTROLLER
GENERAL DESCRIPTION
WT 8072 is a PIR (passive infra-red) controller, using analog mixing digital design technique and
manufactures by CMOS process which can either drive TRIAC or RELAY depending on users' choice.
With special noise immunity technique, WT8072 is the most stable PIR controller you can find on the
market. More than this, there are few components needed in its application circuit which can reduce
material cost and increase competitive.
FEATURES
*HIGH NOISE IMMUNITY.
*DRIVE EITHER RELAY OR TRIAC.
*ADJUSTABLE LIGHT ON DURATION.
*TRIAC CAN BE EITHER SHUNT OR SERIAL CONNECTED.
*PIR INPUT.
*CDS INPUT.
PIN CONFIGURATION
 
   
  
 




 
   
  




 
 
PIN DESCRIPTION
Pin No. Pin Name I/O
Description
1 UOU1
First stage OP amp output
2 NII 1
First stage OP amp positive input
3 II 1
First stage OP amp negative input
4 VREF
Stable reference voltage
5 GND
System ground
6 TB
Time base for 1. The delay time of receiving PIR singnal to sent a puls to
trigger TRIAC or a high signal to trigger relay.
The delay time = R x C x 32.
The PIR signal patented and accepted only if the signal cycle greater than R
x C x 768 .When state of relay or TRIAC is changing form active into
inactive mode. It takes more than R x C x 4069, then system is able to
receive PIR signal again.
2.The flash cycle show the beginning of auto mode.
Note: Width of TRIAC pulse = R x C x 2.
Flash cycle: R x C x 32768
10 K < R < 1M Ohm
100pF < C < 0.1 Uf (Reference Diagram 1)
7 QTEST
For testing only
Weltrend Semiconductor, Inc.
Page 2




ETC

WT8072 Datasheet Preview

WT8072 Datasheet

PIR CONTROLLER

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8 TCI
9 CDS
10 TRIAC
11 RELAY
12 ZCD
13 VDD
14 II2
15 NII2
16 UOU2
DIAGRAM 1, 2



WT8072
PIR CONTROLLER
To set up the timing of how long Triac or relay is active.
During the period, if the system receives the PIR signal, then it restarts
counting the timing again.
The range for R: 10K < R < 1M Ohm
C: 100uF< C < 0.1 uF (Reference Diagram 2)
Connected to a CDS for inhibiting relay or TRIAC being triggered.
If TRIAC or relay has already being triggered by PIR signal and turned into
active mode, then CDS can not inhibit PIR again.
To trigger TRIAC, active low
Sink current: 15 mA max.
To drive relay, active high
Sink current: 10 mA max.
Source current: 10 mA max.
Detect zero cross of AC line under remote mode function.
Operation voltage: 5V, stand by current: 1mA
2nd stage OP amp negative input
2nd stage OP amp positive input
2nd stage OP amp output

 



  
 
Weltrend Semiconductor, Inc.
Page 3


Part Number WT8072
Description PIR CONTROLLER
Maker ETC
Total Page 5 Pages
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