TCS3771 datasheet(24/49 Pages) OSRAM

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[v1-31] 2018-Apr-04

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TCS3771 − Principles of Operation

I2C Protocol

Interface and control are 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.

The devices support the 7-bit I2C addressing protocol.

The I2C standard provides for three types of bus transaction:

read, write, and a combined protocol (Figure 27). 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. The command byte contains either control information

or a 5-bit register address. The control commands can also be

used to clear interrupts.

The I2C bus protocol was developed by Philips (now NXP). For

a complete description of the I2C protocol, please review the

NXP I2C design specification at

http://www.i2c-bus.org/references.

Figure 27:

I2C Protocols

…

Continuation of protocol

Write (0)

Repeated Start Condition

Start Condition

Not Acknowledged (1)

Acknowledge (0)

Master-to-Slave

Slave-to-Master

Read (1)

Stop Condition

Slave Address

W A

Command Code

I2C Read Protocol - Combined Format

Slave Address

Data

...

Slave Address

Data

11 1

I2C Read Protocol

...

Data

Slave Address

Command Code

11 1

I2C Write Protocol

...

Data Byte

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