TSL2568CS datasheet(18/56 Pages) OSRAM

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ams Datasheet

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[v1-00] 2016-Apr-12

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TSL2568, TSL2569 − Principles of Operation

SMBus and I²C Protocols

Each Send and Write protocol is, essentially, a series of bytes. A

byte sent to the TSL256x with the most significant bit (MSB)

equal to 1 will be interpreted as a COMMAND byte. The lower

four bits of the COMMAND byte form the register select address

(see Figure 27), which is used to select the destination for the

subsequent byte(s) received. The TSL256x responds to any

Receive Byte requests with the contents of the register specified

by the stored register select address.

The TSL256X implements the following protocols of the SMB

2.0 specification:

• Send Byte Protocol

• Receive Byte Protocol

• Write Byte Protocol

• Write Word Protocol

• Read Word Protocol

• Block Write Protocol

• Block Read Protocol

The TSL256X implements the following protocols of the Philips

Semiconductor I²C specification:

• I²C Write Protocol

• I²C Read (Combined Format) Protocol

When an SMBus Block Write or Block Read is initiated (see

description of Command Register), the byte following the

COMMAND byte is ignored but is a requirement of the SMBus

specification. This field contains the byte count (i.e. the number

of bytes to be transferred). The TSL2568 (SMBus) device ignores

this field and extracts this information by counting the actual

number of bytes transferred before the Stop condition is

detected.

When an I²C Write or I²C Read (Combined Format) is initiated,

the byte count is also ignored but follows the SMBus protocol

specification. Data bytes continue to be transferred from the

TSL2569 (I²C) device to Master until a NACK is sent by the Master.

The data formats supported by the TSL2568 and TSL2569

devices are:

• Master transmitter transmits to slave receiver

(SMBus and I²C):

• The transfer direction in this case is not changed.

• Master reads slave immediately after the first byte

(SMBus only):

• At the moment of the first acknowledgment

(provided by the slave receiver) the master

transmitter becomes a master receiver and the slave

receiver becomes a slave transmitter.

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