pt8a2621w Pericom Technology Inc, pt8a2621w Datasheet - Page 7

• Manufacturer Part Number: pt8a2621w
• Description: Pir Sensor Light Switch Controller
• Manufacturer: Pericom Technology Inc

PT0091(11/03)
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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 the AUTO mode within the first 40 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.
Figure 7. Trigger Timing
Notes: 1. The output is activated if the trigger signal conforms to the following criteria:
Comparator
Comparator
RELAY
TRIAC
Enable
Detect
Output
Enable
Output
Enable
2. The output duration is set by an external RC connected to the OSCD pin.
Input
CDS
RST
Test
10s test
- 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)
enable
power on delay time
40s
7
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
Trigger
The trigger timing is shown in Figure 7.
Retrigger -- If another signal is attained in trigger hold time,
the circuit will be retriggered, and the trigger hold time will be
started from this time.
5s
PIR Sensor Light Switch Controller
<24ms
RST
>24ms
to the RST pin as shown in Figure 4.
(Note1)
pulse out
ON
ON
PT8A2611/2621
(Note2)
+trigger level
-trigger level
Data Sheet
Ver:3