AD7294 datasheet(32/45 Pages) AD

32 / 45 page

AD7294

Preliminary Technical Data

Rev. PrB | Page 32 of 45

WRITING/READING TO THE AD7294

The AD7294 uses the following I2C protocols:

Writing to the Address Pointer Register

for a Subsequent Read

In the AD7294, to read from a particular register, the address

pointer register must first contain the address of that register. If

the address pointer is not set, the correct address must be

written to the address pointer register by performing a single

byte write operation, as shown in Figure 29. In this operation,

the slave device receives a single byte from a master as follows:

The master device asserts a start condition on SDA.

The master sends the 7-bit slave address followed by

the write (low) bit.

The addressed slave device asserts ACK on SDA.

The slave receives a data byte.

The slave asserts ACK on SDA.

The master asserts a stop condition on SDA, and the

transaction ends.

SDA

START BY

MASTER

ACK. BY

AD7294

ACK. BY

AD7294

STOP BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

SCL

R/W

Figure 29. Writing to the Address Pointer Register to Select a Register for a Subsequent Read Operation

AD7294 Datasheet(PDF) 32 Page - Analog Devices