LX1970MINI EVAL

LX1970MINI EVAL Datasheet

LX1970 Mini Control Board

Part	Datasheet
LX1970MINI EVAL	LX1970MINI EVAL (pdf)

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.COM INTEGRATED PRODUCTS LX1970 Mini Control Board LX1970 Light Sensor SCHEMATIC C1 0.1µF R3 VDD VOUT SOURCE SINK C2 4.7µF LX1970DU The LX1970 Mini Light Sensor Board can be used to convert a manual DC voltage dimmer to a closed loop automatic dimmer. The resistor values can be changed to fit the design requirements. The LX1970 output current is proportional to the incident light intensity up to the point where either the current source voltage compliance is exceeded or the light sensor saturates. See the data sheet and application note for additional information. V OUT [ I SRC x R1 + V DD R2 R1 + R2 The value of R3 is typically less than 1K and is used as a power filter for the LX1970 if the VDD line is excessively noisy. With VDD = 3.0V, R1 = 150K, R2 = 30K and R3 = 0, the current output voltage in total darkness is VDD x R2/ R1 + R2 = 0.5V. The maximum output voltage is approximately VDD = 2.7V, which is limited by the output voltage compliance at a current of 2.7V x R1 + R2 / R1 x R2 = 108uA. PHOTO PACKAGE PIN OUT VDD NC active area 8 VSS NC SNK NAME VDD VSS SNK SRC DU PACKAGE Top View FUNCTIONAL PIN DESCRIPTION Input Supply Voltage Some boards wired with a RED pigtail. Ground Reference for Power and Signal Output Some boards wired with a BLACK pigtail. Output Current Sink Output Current Source Some boards wired with a YELLOW pigtail. 3/24/2004 Rev Microsemi Integrated Products 11861 Western Avenue, Garden Grove CA. 92841 714-898-8121, FAX 714-893-2570 LX1970

PDF Datasheet Preview

.COM

INTEGRATED PRODUCTS

LX1970 Mini Control Board

LX1970 Light Sensor

SCHEMATIC

C1 0.1µF

R3 VDD

VOUT

SOURCE SINK

C2 4.7µF

LX1970DU

The LX1970 Mini Light Sensor Board can be used to convert a manual DC voltage dimmer to a closed loop automatic dimmer. The resistor values can be changed to fit the design requirements. The LX1970 output current is proportional to the incident light intensity up to the point where either the current source voltage compliance is exceeded or the light sensor saturates. See the data sheet and application note for additional information.

V OUT
[ I SRC
x R1 + V DD

R2 R1 + R2

The value of R3 is typically less than 1K and is used as a power filter for the LX1970 if the VDD line is excessively noisy.

With VDD = 3.0V, R1 = 150K, R2 = 30K and R3 = 0, the current output voltage in total darkness is VDD x R2/ R1 + R2 = 0.5V. The maximum output voltage is approximately VDD = 2.7V, which is limited by the output voltage compliance at a current of 2.7V x R1 + R2 / R1 x R2 = 108uA.

PHOTO

PACKAGE PIN OUT

VDD NC
active area 8

VSS NC SNK

NAME VDD VSS SNK SRC

DU PACKAGE

Top View

FUNCTIONAL PIN DESCRIPTION

Input Supply Voltage Some boards wired with a RED pigtail. Ground Reference for Power and Signal Output Some boards wired with a BLACK pigtail. Output Current Sink Output Current Source Some boards wired with a YELLOW pigtail.
3/24/2004 Rev

Microsemi

Integrated Products 11861 Western Avenue, Garden Grove CA. 92841 714-898-8121, FAX 714-893-2570

LX1970

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Datasheet ID: LX1970MINIEVAL 648155