LX1972MINI Datasheet, PDF (1/1 Pages) Microsemi Corporation – LX1972 Light Sensor

LX1972 Mini Evaluation Board
TM
®
LX1972 Light Sensor
SCHEMATIC
V_DD
R1 C1
J1
50K 4.7uF
VO1
1
LX1972
2
VO2
R2 C2
J2
50K 4.7uF
The design of the LX1972 Mini Light Sensor Evaluation Board easily
interfaces to allow control of virtually any lighting requirement. Changing the
resistor values sets the desired minimum and maximum brightness range. As
configured, there is considerable gain at lower light levels (from < 1lux to about
300lux with a 5V VDD). Output voltage is ground referenced (as configured
VO2) or moving the jumper from J1 to J2 changes the voltage reference to
VDD at VO1. The J1 and J2 locations also allow placing a second resistor in
parallel to modify the light conversion gain; this will allow a wider light range
(with less overall resolution).
VDD = 3V to 5.5V
VO1 = I_SNK × R1 (if J1 Open)
VO2 = I_SRC × R2
If VDD = 5V then :
@ Total Dark VO2 <10mV
@ 300 lux VO2 ≈ 3V
Protected By U.S. Patents: 6,787,757; Patents Pending
PHOTO
PACKAGE PIN OUT
BC PACKAGE
(Top View)
NAME
V_DD
GND
1/27/2005
Rev 1.1a
FUNCTIONAL PIN DESCRIPTION
DESCRIPTION
Input Supply Voltage
Ground Reference for Power and Signal Outputs
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove CA. 92841 714-898-8121, FAX: [phone]