TAS3108DCPR datasheet(28/63 Pages) TI1

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SDA

SCL

Start

(By Master)

Slave Address

(By Master)

Read or Write

(By Master)

Acknowledge

(By TAS3108/TAS3108IA)

Data Byte

(By Transmitter)

Acknowledge

(By Receiver)

Data Byte

(By Transmitter)

Acknowledge

(By Receiver)

Stop

(By Master)

MSB

MSB−1 MSB−2

LSB

Start Condition

SDA

↓ While SCL = 1

Stop Condition

SDA

↑ While SCL = 1

T0087−01

(1)

6.1 General I

2C Operations

TAS3108, TAS3108IA

AUDIO DIGITAL SIGNAL PROCESSORS

SLES152B – OCTOBER 2005 – REVISED NOVEMBER 2007

Figure 6-1. I2C Slave-Mode Communication Protocol

As shown in Figure 6-2, an I2C read transaction requires that the master device first issue a write

transaction to give the TAS3108/TAS3108IA the subaddress to be used in the read transaction that

follows. This subaddress assignment write transaction is then followed by the read transaction. For write

transactions, the subaddress is supplied in the first byte of data written, and this byte is followed by the

data to be written. For I2C write transactions, the subaddress must always be included in the data written.

There cannot be a separate write transaction to supply the subaddress, as was required for read

transactions. If a subaddress assignment-only write transaction is followed by a second write transaction

supplying the data, erroneous behavior results. The first byte in the second write transaction is interpreted

by the TAS3108/TAS3108IA as another subaddress replacing the one previously written.

Microprocessor Controller

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