TSL2580FN datasheet(16/53 Pages) OSRAM

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ams Datasheet

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[v1-00] 2016-Apr-05

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TSL2580, TSL2581 − Principles Of Operation

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

TSL2581 (I²C) device to Master until a NACK is sent by the Master.

The data formats supported by the TSL2580 and TSL2581

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.

• Combined format (SMBus and I²C):

• During a change of direction within a transfer, the

master repeats both a START condition and the slave

address but with the R/W bit reversed. In this case, the

master receiver terminates the transfer by generating

a NACK on the last byte of the transfer and a STOP

condition.

For a complete description of SMBus protocols, please review

the SMBus Specification at:

http://www.smbus.org/specs

For a complete description of I²C protocols, please review the

I²C Specification at:

www.nxp.com

Figure 17:

SMBus and I²C Packet Protocol Element Key

Data Byte

Slave Address

Acknowledge (this bit position may be 0 for an ACK or 1 for a NACK)

Stop Condition

Read (bit value of 1)

Start Condition

Repeated Start Condition

Write (bit value of 0)

Shown under a field indicates that that field is required to have a value of X

...

Continuation of protocol

Master-to-Slave

Slave-to-Master

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