ADAU1373BCBZ-R7 datasheet(72/296 Pages) AD

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ADAU1373

Rev. 0 | Page 72 of 296

I2C Read and Write Operations

Figure 119 shows the format of a single-word write operation.

Every ninth clock pulse, the ADAU1373 issues an acknowledge

by pulling SDA low.

Figure 120 shows the format of a burst mode write sequence. This

figure shows an example of a write to sequential single-byte

registers. The ADAU1373 increments its subaddress register

after every byte because the requested subaddress corresponds

to a register or memory area with a 1-byte word length.

Figure 121 shows the format of a single-word read operation.

Note that the first R/W bit is set to 0, indicating a write

operation. This is because the subaddress still needs to be

written to set up the internal address. After the ADAU1373

acknowledges the receipt of the subaddress, the master must issue

a repeated start command, followed by the chip address byte with

the R/W bit set to 1 (read). This causes the ADAU1373 SDA to

reverse and begin driving data back to the master. The master

then responds every ninth pulse with an acknowledge pulse to

the ADAU1373.

Figure 122 shows the format of a burst mode read sequence.

This figure shows an example of a read from sequential single-

byte registers. The ADAU1373 increments its subaddress register

after every byte because the requested subaddress corresponds

to a register or memory area with a 1-byte word length. The

ADAU1373 always decodes the subaddress and sets the auto-

increment circuit so that the address increments after the

appropriate number of bytes.

Figure 119 to Figure 122 use the abbreviations shown in Table 33.

Table 33. Abbreviations for Read/Write Operations Format

Abbreviation

Description

Start bit

Stop bit

Acknowledgment by master

Acknowledgment by slave

DEVICE ADDRESS,

R/W = 0

DATA BYTE

Figure 119. Single-Word I2C Write Format

DEVICE ADDRESS,

R/W = 0

DATA BYTE 1

DATA BYTE 2

DATA BYTE 3

Figure 120. Burst Mode I2C Write Format

DEVICE ADDRESS

DEVICE ADDRESS,

R/W = 0

DATA BYTE

Figure 121. Single-Word I2C Read Format

DEVICE ADDRESS

DEVICE ADDRESS,

R/W = 0

DATA BYTE 1

DATA BYTE 2

...

Figure 122. Burst Mode I2C Read Format

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