PT8A2612 Datasheet, PDF (7/13 Pages) Pericom Semiconductor Corporation – PIR Sensor Light Switch Controller

Data Sheet
PT8A261/262
PIR Sensor Light Switch Controller
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Power On Initial
The PIR signal amplifier requires a warm up period after power-
on. The input should be disabled during this period.
In case that the ZC signal disappears more than 3 seconds, the
chip will restart the initialization operation. However, the re-
start initial time is always 40 seconds and cannot be extended
by adding C_RST to the RST pin as shown in Figure 6.
In the AUTO mode within the first 10 seconds of the initial
time the chip allows override control to enter the quickly in-
stall mode.After 40s of the initial time the chip allows over-
ride control between ON and AUTO. It will remain in the warm
up period if the total initial time has not elapsed after return-
ing to AUTO.
Trigger
The trigger timing is shown in Figure 9.
Retrigger -- If another signal is attained in trigger hold time,
the circuit will be retriggered, and the trigger hold time will be
restarted from this time.
Figure 9. Trigger Timing
RST
CDS
Output
Enable
Comparator
Input
Comparator
Output
Detect
Enable
Test
Enable
power on delay time
40s
10s test
enable
RELAY
TRIAC
5s
>24ms
+trigger level
-trigger level
<24ms
(Note1)
ON
ON
pulse out
(Note2)
Notes:
1. The output is activated if the trigger signal conforms to the following criteria:
- More than 3 triggers within 2 seconds,
- A trigger signal sustain duration > 0.34 seconds, and
- 2 triggers within 2 seconds with pulse duration of one > 0.16 seconds.
- The effective comparator output width is 24ms.(Fosc=16KHz)
2. The output duration is set by an external RC connected to the OSCD pin.
PT0075(04/03)
7
Ver:5