pt8a262w Pericom Technology Inc, pt8a262w Datasheet - Page 6

• Manufacturer Part Number: pt8a262w
• Description: Pir Sensor Light Switch Controller
• Manufacturer: Pericom Technology Inc

PT0075(04/03)
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
MODE
MODE is a tri-state input pin for operation mode selection.
See the following table 3.
Override Control: The term “override” refers to the change of
operating mode by switching the power switch twice within 3
seconds. When the chip is working in the AUTO mode (MODE
pin openned), the output is activated by a valid PIR trigger
signal and the output active duration is controlled by the OSCD
oscillation period. The lamp can be switched to ON from the
AUTO mode by either switching the MODE pin to V
switching the power switch twice within 3 seconds. The de-
RST Pin
RST is used to reset the device. It is internal pull-high and
active low. The use of C
time. If the RST pin is openned (without CRST), the initial
time is 40 seconds. See Figure 8.
Table 3. Operation Modes by MODE Pin
Figure 7. Override Timing
MODE
Status
Open
GND
V
Operating Mode
CC
ZC
Operation
AUTO
Mode
OFF
ON
RST
AUTO
can extend the power-on initial
synchronized by ZC for triac driving.
Output is always ON: RELAY pin sends high level for relay driving; TRIAC pulse train output is
Output is always OFF: RELAY pin sends low level for relay driving; TRIAC pin sends high level
for triac driving.
Outputs remain in the OFF state until activated by a valid PIR trigger input signal. When working
in the AUTO mode, the device allows override control by switching the ZC signal.
Flash is only for TRIAC version
flash
ON
CC
or
6
vice can be toggled from ON to AUTO by switching the power
switch twice within 3 seconds again (override operation).
If the chip is overridden to ON and there is no further override
operation, it will return to AUTO automatically after an inter-
nal preset ON time duration (8 hours).
The override operation will cause the lamp flash (for TRIAC
version only). It will flash 3 times at 1Hz rate when changing
AUTO mode to other mode, and flash 3 times at 2Hz rate when
returning to AUTO mode. But no flash if mode is changed by
switching the MODE switch. See Figure 7 for override timing.
Figure 8. RST Application Example
AUTO
flash
PIR Sensor Light Switch Controller
Description
REST
ON
8 hours
flash
RST
PT8A261/262
C
V
Data Sheet
AUTO
CC
RST
flash
GND
Ver:5