OUTDOOR LIGHTING. LS7217 Datasheet

LS7217 LIGHTING. Datasheet pdf. Equivalent

LS7217 Datasheet
Recommendation LS7217 Datasheet
Part LS7217
Description PHOTO CONTROLLED OUTDOOR LIGHTING
Feature LS7217; LSI/CSI LS7217   LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631)271-0.
Manufacture LSI
Datasheet
Download LS7217 Datasheet




LSI LS7217
LSI/CSI
LS7217
 
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631)271-0400 FAX (631) 271-0405
                           PHOTO CONTROLLED OUTDOOR LIGHTING WITH PROGRAMMABLE TIMER Sep 2014
FEATURES:
Input interface to a LDR or a photo transistor
Programmable Duration Selection
Shunt regulator
50Hz / 60Hz time base selection
Relay Driver output
6.0V ± 0.75V operating voltage range (VDD – VSS)
LS7217 (DIP), LS7217-S (SOIC) – See Figure 1
PIN ASSIGNMENT
APPLICATIONS
Lighting control for outdoor area lighting, street lighting, parking lot
lighting, billboards lighting
DESCRIPTION
The 7217 is a programmable Timer IC designed to turn on a relay at
night and turn off the relay at dawn or after a selectable number of
hours. Figure 2 shows a typical application schematic.
PIN DESCRIPTION:
The following describes the operation of the inputs and outputs of the
IC.
FIGURE 1
The Time Select Table is as follows:
TS1 TS2
00
01
10
11
Time Duration
4 Hours
6 Hours
8 Hours
Dusk-to-Dawn
VDD (Pin 2)
VDD is the supply voltage positive terminal. It is regulated internally in
the IC. The internal voltage regulator produces 6.0V ± 0.75V.
Dusk-to-Dawn duration is determined solely by the photo-cell; i.e.,
the Relay output is on whenever the photocell recognizes an ambient
dark condition.
VSS (Pin 6)
VSS is the supply voltage negative terminal.
50Hz / 60Hz SELECT Input (Pin 8)
A high at this input selects the correct timing for 50Hz operation.
Floating this input selects the correct timing for 60Hz operation. A
low at this input places the LS7217 into Test Mode where the
timeouts are accelerated by a factor of 60.
50Hz / 60Hz Input (Pin 7)
This input is the clock source for all timing functions. This input has a
Schmitt trigger to ensure a clean internal clock waveform.
TIME SELECT Inputs TS1, TS2 (Pins 4, 5)
The two Select inputs determine the time duration that the Relay
output stays on after the photo input goes low. Both inputs have
internal pull-down transistors so that float is logic zero and
connection to VDD is logic 1.
PHOTO Input (Pin 3)
The photo input has hysteresis for a positive trip point. The input will
work with a Light Dependent Resistor (LDR) or a photo-transistor
connected between the input and VDD. The photo device has low
impedance in the presence of ambient light and high impedance in
the presence of ambient darkness.
The IC is configured so that the detection of a light condition must
remain for 6.0 seconds (± 0.5 seconds) continuously in order to be
recognized as a valid light condition. A dark condition must
remain for 1.0 second (± 0.25 seconds) continuously in order to be
recognized as a valid dark condition.
RELAY Output (Pin 1)
This output is configured to drive the base of an external NPN
transistor (see Figure 2). A valid dark condition at the PHOTO input
causes the RELAY output to switch high and a valid light condition at
the PHOTO input causes the output to switch low.
7217-091814-1



LSI LS7217
 
FIGURE 2. DUSK TO DAWN AUTO ON/OFF OUTDOOR LIGHTING APPLICATION
R1=68kΩ, 1/2W, @120VAC
R1=240kΩ, 1/2W, @240VAC
R2=6.8kΩ, 2W, @120VAC
R2=27kΩ, 2W, @240VAC
R3=4.7kΩ, 2W, @120VAC
R4=680kΩ, 2W, @240VAC
R4=1MΩ, 2W, @120VAC
R5, R6=As needed for driving relay
R7=100kΩ, 1/4W Potentiometer
R8=18kΩ, 1/4W
R9=4.3kΩ, 1/4W
C1=0.33uF, 200VAC, @120VAC
C1=0.2uF, 400VAC, @240VAC
C2=470uF, 25V
C3=0.1uF
C4=470pF
Z=15V Zener, 1W
D=DF04
D1=1N4148
Q1=2N5845
LOAD=Incandescent, LED, fluorescent or HID
lamp
**For the photo-sensitive device use either LDR, R10=Silonex NSL-19M51 or use
Photo-transistor, Q2=Vishay TEPT 4400.
NOTE1: This application circuit can be used for lighting control of public spaces such as
Parking Lots, Billboards, street lamps etc.
NOTE2: Indicated connections of pins 4 and 5 keep the lamp on from dusk to dawn. See page 1
for configuring pins 4 and 5 connections to select 4, 6 or 8 hours on-time.
7217-092214-2



LSI LS7217
ABSOLUTE MAXIMUM RATINGS: (All voltages referenced to VSS)
DC Supply Voltage
Voltage (Any Pin)
Operating Temperature
Storage Temperature
SYMBOL
VDD
VIN
TA
TSTG
VALUE
+8
VSS - 0.3 to VDD + 0.3
-20 to +85
-40 to +150
UNIT
V
V
°C
°C
DC ELECTRICAL CHARACERISTICS:
(TA = 25°C, VDD = 6.0V unless otherwise specified.
PARAMETER
SYMBOL
MIN
TYP MAX UNIT
TS1, TS2 Low
TS1, TS2 High
TLO
THI
--
3.0 -
1.4 V
-V
50/60 Hz Low
50/60 Hz High
VHZL
VHZH
--
4.4 -
2.9 V
-V
Photo
Light Threshold
Dark Threshold
VIT
VET
3.5 -
-
-V
2.9 V
Input Current
(All inputs high)
50Hz/60Hz Select ]
TS1, TS2
]
IIH
-
24 -
mA
RELAY Output Current
Sourcing, VO = 0.7V IOH
Sinking, VO = 0.4V IOL
4.0 - - mA
-50 -
-
uA
7217-080113-3
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, or for
any infringements of patent rights of others which may
result from its use.







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