TAS5708 datasheet(25/56 Pages) TI

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Single-Byte Read

A0 R/W ACK A7

A0 ACK

ACK

Start

Condition

Stop

Condition

Acknowledge

I CDevice Addressand

Read/WriteBit

Subaddress

DataByte

D0 ACK

I CDevice Addressand

Read/WriteBit

Not

Acknowledge

R/W

RepeatStart

Condition

T0036-03

Multiple-Byte Read

ACK

Acknowledge

I CDevice Addressand

Read/WriteBit

R/W

R/W ACK

A0 ACK

ACK

Start

Condition

Stop

Condition

Acknowledge

LastDataByte

ACK

FirstDataByte

RepeatStart

Condition

Not

Acknowledge

I CDevice Addressand

Read/WriteBit

Subaddress

OtherDataBytes

D0 ACK

Acknowledge

T0036-04

TAS5708

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

As shown in Figure 30, a single-byte data read transfer begins with the master device transmitting a start

condition followed by the I2C device address and the read/write bit. For the data read transfer, both a write

followed by a read are actually done. Initially, a write is done to transfer the address byte or bytes of the internal

memory address to be read. As a result, the read/write bit becomes a 0. After receiving the TAS5708 address

and the read/write bit, TAS5708 responds with an acknowledge bit. In addition, after sending the internal memory

address byte or bytes, the master device transmits another start condition followed by the TAS5708 address and

the read/write bit again. This time the read/write bit becomes a 1, indicating a read transfer. After receiving the

address and the read/write bit, the TAS5708 again responds with an acknowledge bit. Next, the TAS5708

transmits the data byte from the memory address being read. After receiving the data byte, the master device

transmits a not acknowledge followed by a stop condition to complete the single byte data read transfer.

Figure 30. Single-Byte Read Transfer

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

are transmitted by the TAS5708 to the master device as shown in Figure 31. Except for the last data byte, the

master device responds with an acknowledge bit after receiving each data byte.

Figure 31. Multiple Byte Read Transfer

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