TAS5708 datasheet(24/56 Pages) TI

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Single-Byte Write

R/W ACK A7

ACK

D0 ACK

Start

Condition

Stop

Condition

Acknowledge

I CDevice Addressand

Read/WriteBit

Subaddress

DataByte

T0036-01

Multiple-Byte Write

D0 ACK

Stop

Condition

Acknowledge

I CDevice Addressand

Read/WriteBit

Subaddress

LastDataByte

A0 R/W ACK A7

ACK D7

ACK

Start

Condition

Acknowledge

FirstDataByte

OtherDataBytes

ACK

Acknowledge

T0036-02

TAS5708

SLOS570 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com

Supplying a subaddress for each subaddress transaction is referred to as random I2C addressing. The TAS5708

also supports sequential I2C addressing. For write transactions, if a subaddress is issued followed by data for

that subaddress and the 15 subaddresses that follow, a sequential I2C write transaction has taken place, and the

data for all 16 subaddresses is successfully received by the TAS5708. For I2C sequential write transactions, the

subaddress then serves as the start address, and the amount of data subsequently transmitted, before a stop or

start is transmitted, determines how many subaddresses are written. As was true for random addressing,

sequential addressing requires that a complete set of data be transmitted. If only a partial set of data is written to

the last subaddress, the data for the last subaddress is discarded. However, all other data written is accepted;

only the incomplete data is discarded.

As shown in Figure 28, a single-byte data write transfer begins with the master device transmitting a start

condition followed by the I2C device address and the read/write bit. The read/write bit determines the direction of

the data transfer. For a write data transfer, the read/write bit will be a 0. After receiving the correct I2C device

address and the read/write bit, the DAP responds with an acknowledge bit. Next, the master transmits the

address byte or bytes corresponding to the TAS5708 internal memory address being accessed. After receiving

the address byte, the TAS5708 again responds with an acknowledge bit. Next, the master device transmits the

data byte to be written to the memory address being accessed. After receiving the data byte, the TAS5708 again

responds with an acknowledge bit. Finally, the master device transmits a stop condition to complete the

single-byte data write transfer.

Figure 28. Single-Byte Write Transfer

A multiple-byte data write transfer is identical to a single-byte data write transfer except that multiple data bytes

are transmitted by the master device to the DAP as shown in Figure 29. After receiving each data byte, the

TAS5708 responds with an acknowledge bit.

Figure 29. Multiple-Byte Write Transfer

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