SFH5721 datasheet(4/54 Pages) OSRAM

4 / 54 page

SFH 5721

DATASHEET

4 | Version 1.1 | 2022-02-28

General description

The SFH5721 Digital Ambient Light Sensor combines an array of photodiodes and wide dynamic

range readout channels to enable ambient light and infrared sensing. In the figure below you can

see a simplified block diagram of the digital light sensor IC. The sensor consists of photopic, infrared

and dark channel integrated in one single chip. Three integrated ADCs convert the photodiode signal

into a digital output which can be accessed by an external microcontroller through I²C. Photopic filter

coating deposited on broadband photodiode provides near V lambda response. IR filter coating

covering the broadband photodiode provides a response to an IR light. Signal of the dark photodiode

is subtracted from the illumined photodiodes and is used for dark current compensation. An Interrupt

feature allows to detect a significant change in light intensity. Programmable interrupt threshold

out and control of the sensor is accomplished through a two-wire serial I²C interface via set of

registers. The user can select two different slave addresses via an external address select pin. Both

integration time and gain of the ADC can also be programmed via control register.

Block diagram

SFH5721 Datasheet(PDF) 4 Page - OSRAM GmbH