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PDF PT8A2621 Data sheet ( Hoja de datos )
| Número de pieza | PT8A2621 | |
| Descripción | (PT8A2611 / PT8A2621) PIR Sensor Light Switch Controller | |
| Fabricantes | Pericom Technology | |
| Logotipo |  |
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Data Sheet
PT8A2611/2621
PIR Sensor Light Switch Controller
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Features
General Description
• 2-stage operational amplifier as filter
• Built-in noise rejection circuit
• On-chip regulator
• Override function (PT8A2621 only)
• Synchronous with AC 220V/50Hz and 110V/60Hz
• Pulse output (PT8A2611) for TRIAC drive or
level output (PT8A2621) for relay drive
• CDS to enable/disable output
• Adjustable output on time duration
• ON/AUTO/OFF selectable by MODE pin
• Auto-reset if the ZC signal disappears over 3 seconds
• 40 seconds warm-up
• Quick check mode for initial installation
• Operating voltage: 5V
• Stand-by current: 80µA
• Package:16-pin DIP and 16-pin SOP
Applications
• Energy saving auto-switch in Garden, kitchen,
bathroom, corridor, storage or yard
• Auto light in meeting room
The PT8A2611 and PT8A2621 are low power mixed
signal CMOS LSI designed for the automatic lamp
control using PIR sensor as motion detector.
With on chip noise filter and voltage regulator, the IC
provides stable operations throughout temperature
range. CDS input to disable day time operation is
desired.
Function Comparison
Override CDS feedback Output
PT8A2611 No function Internal
TRIAC
PT8A2621 Twice
With external
components
(see Fig. 10,
D9 and R15)
RELAY
Ordering Information
Part Number
PT8A2611P / PT8A2621P
PT8A2611W / PT8A2621W
PT8A2611DE / PT8A2621DE
Package
16 - Pin PDIP
16 - Pin SOP
Die Form
Block Diagram
OP2O
OP2N
OP2P
OP1O
OP1P
OP1N
VEE
OSCD
OSCS
_
+
+
_
Comparator
Voltage
divider
Regulator
latch circuit
Mode and CDS
control circuit
(Internal CDS
feedback,
for 2611 only)
Control
circuit
Output circuit
delay
oscillator
System
oscillator
Delay
circuit
Counter
circuit
Zero cross
debounce
MODE
CDS
RELAY
(for 2621 only)
TRIAC
(for 2611 only)
RST
ZC
PT0091(04/03)
1
Ver:3
1 page  
Data Sheet
PT8A2611/2621
PIR Sensor Light Switch Controller
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Functional Descriptions
OSCS and OSCD Pins
The PT8A2611 and PT8A2621 are CMOS LSI chips designed
for automatic PIR lamp control. They can operate in 2-wire
configuration for triac applications or in 3-wire configuration
for relay applications.
The PIR sensor detects infrared power variations caused by
motion of a human body and transfer to a voltage variation. If
the PIR output voltage variation conforms to criteria, the lamp
is turned on for an adjustable duration. The PT8A2611 (or
2621) offers three operating modes (ON, AUTO, OFF) which
can be set through a MODE pin. When the device is working
in AUTO mode, the user can override the mode to switch it to
TEST mode or manual ON mode, or return to the AUTO mode
by switching power switch.
OSCS is a system oscillator I/O pin connected to an external
RC to generate system frequency of 16kHz. OSCD is an output
timing oscillator I/O pin. It’s connected to an external RC to
obtain the desired turn-on duration by selecting various val-
ues of RC or using a variable resistor.FOSCDis the frequency of
OSCD pin, output timing can be caculated as the formula:
TD = 21504/FOSCD
CDS Input Circuit
CDS is a CMOS schmitt trigger input pin. It is used to distin-
guish between day time and night time. When the input volt-
age of CDS is high the PIR input is enabled, when CDS low the
PIR input disabled. The input disable-to-enable debounce
time is 5 seconds. Connect this pin to VCC when not using it.
The CDS input is ignored by PT8A2611when the TRIAC out-
put is active, however, PT8A2621’s CDS can not be ignored
anytime.
Figure 1. System Oscillator
RS 560K
OSCS PT8A2611
/2621
CS
200P
Figure 2. Output Timing Oscillator
TD = 21504 / F OSCD
RD
OSCD PT8A2611
/2621
CD
Figure 3. CDS Input Circuit
V
CC
Rp
CDS
Schmitt
Driver
Control
CDS Circuit
CDS
PT8A2611/2621
Figure 4. CDS Enable Debounce
CDS
PIR Enable
Disable
< 5s
> 5s
Enable
Table 1. CDS Pin Function
CDS
Status
LOW
Day Time
HIGH
Night
PT0091(04/03)
PIR
Disabled
Enabled
5
Ver:3
5 Page 
Data Sheet
PT8A2611/2621
PIR Sensor Light Switch Controller
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Typical Application Circuits
Figure 9. Two-Wire Application Circuit of PT8A2611
PT0091(04/03)
11
Ver:3
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet PT8A2621.PDF ] | |
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