LS521

點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE

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ILLUMINATION-TO-DIGITAL CONVERTERS

GENERAL DESCRIPTION

The LS521 is a low-noise, high-sensitivity and illumination-to-digital converter with two-wire SMBus serial

interface. The device integrates a photodiode, a trans-impedance amplifier, and 8-bits analog-to-digital converter

(ADC) in a single IC to provide illumination information over an effective 8-bit dynamic range. The digital

output is directly proportional to ambient illumination. The LS521 is characterized with the C.I.E. response as the

human eye’s visual response, which peaks at 555nm.

Illumination information can be used to control display panel backlighting with the purpose of extending

battery life and providing optimum viewing in diverse lighting conditions. Also, illumination information can

further be used to manage exposure control in digital cameras and camcorders. The LS521 device is ideal in

notebook/tablet PCs, flat-panel televisions, cellular phones, LCD monitors, digital cameras, camcorder, and

street/room lighting control, etc.

FEATURES

1.

Characterized with the C.I.E. response as the human eye’s response

2.

8-bit linear digital output for ambient illumination with two wire SMBus interface.

3.

Tunable illumination sensitivity by an external resistor

4.

5.

Wide power supply range (2.7~5.5V)

6.

Low power dissipation in shut-down mode.

7.

Tiny SMD type package:

Width: 3.0mm/Height: 3.0 mm/Depth: 1.1mm

Width: 2.0mm/Height: 2.0 mm/Depth: 0.63mm

8.

High sensing illuminance range (0~14000 lux).