SFH5721 datasheet(42/54 Pages) OSRAM

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SFH 5721

DATASHEET

42 | Version 1.1 | 2022-02-28

I2C Protocol

Interface and control of the Digital Light Sensor (DLS) IC is accomplished through an I2C serial

compatible interface (standard or fast mode) to a set of registers that provide access to device control

functions and output data. Device address can be set to one of the two values found I table below.

The IC address depends on the voltage sensed on the ADDR pin.

ADDR

I2C Address (dec)

I2C Address (hex)

GND

7’d38

0x26

VDD

7’d39

0x27

The I2C standard provides for three types of bus transaction: read, write and a combined protocol.

During a write operation, the first byte written is a command byte followed by data. In a combined

protocol, the first byte written is the command byte followed by reading a series of bytes. If a read

command is issued, the register address from the previous command will be used for data access.

Likewise, if the MSB of the command is not set, the device will write a series of bytes at the address

stored in the last valid command with a register address. For a complete description of I2C protocols,

please review the I2C Specification at: http://www.NXP.com.

Start and Stop Conditions

SCL

SDA

START condition

STOP condition

SFH5721 Folha de dados(PDF) 42 Page - OSRAM GmbH