LX1972MINI

LX1972 Mini Evaluation Board TM ® LX1972 Light Sensor SCHEMATIC W WW . Microsemi . C OM VDD J1 R1 50K 1 C1 4.7uF VO1 LX1972 2 R2 50K C2 4.7uF VO2 J2 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 VDD PHOTO PACKAGE PIN OUT VSS 1 2 If VDD = 5V then : @ Total Dark VO2 < 10mV @ 300 lux VO2 ≈ 3V LX1972 LX1972 BC PACKAGE (Top View) Protected By U.S. Patents: 6,787,757; Patents Pending FUNCTIONAL PIN DESCRIPTION NAME VDD GND 1/27/2005 Rev 1.1a 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: 714-893-2570