AD5272 datasheet(20/28 Pages) AD

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AD5272/AD5274

Data Sheet

Rev. D | Page 20 of 28

READ OPERATION

When reading data back from the AD5272/AD5274, the user

must first issue a readback command to the device, this begins

with a start command followed by an address byte (R/W = 0),

after which the AD5272/AD5274 acknowledges that it is

prepared to receive data by pulling SDA low.

Two bytes of data are then written to the AD5272/AD5274, the

most significant byte followed by the least significant byte; both

of these data bytes are acknowledged by the AD5272/AD5274.

A stop condition follows. These bytes contain the read instruc-

tion, which enables readback of the RDAC register, 50-TP

memory, or the control register. The user can then read back

the data beginning with a start command followed by an

address byte (R/W = 1), after which the device acknowledges

that it is prepared to transmit data by pulling SDA low. Two

bytes of data are then read from the device, as shown in Figure 45.

A stop condition follows. If the master does not acknowledge

the first byte, the second byte is not transmitted by the

AD5272/AD5274.

R/W

ACK. BY

AD5272/AD5274

ACK. BY

AD5272/AD5274

ACK. BY

AD5272/AD5274

ACK. BY

AD5272/AD5274

ACK. BY

MASTER

NO ACK. BY

MASTER

SCL

SDA

SCL (CONTINUED)

SDA (CONTINUED)

SCL (CONTINUED)

SDA (CONTINUED)

START BY

MASTER

SCL

SDA

START BY

MASTER

STOP BY

MASTER

STOP BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

MOST SIGNIFICANT DATA BYTE

FRAME 2

MOST SIGNIFICANT DATA BYTE

FRAME 3

LEAST SIGNIFICANT DATA BYTE

FRAME 3

LEAST SIGNIFICANT DATA BYTE

Figure 45. Read Command

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