AD5272 datasheet(19/28 Pages) AD

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Data Sheet

AD5272/AD5274

Rev. D | Page 19 of 28

WRITE OPERATION

It is possible to write data for the RDAC register or the control

begin 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 RDAC, 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. The write operations for the AD5272/

AD5274 are shown in Figure 43.

A repeated write function gives the user flexibility to update the

device a number of times after addressing the part only once, as

shown in Figure 44.

SCL

SDA

START BY

MASTER

ACK. BY

AD5272/AD5274

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

MOST SIGNIFICANT DATA BYTE

FRAME 3

LEAST SIGNIFICANT DATA BYTE

SCL (CONTINUED)

SDA (CONTINUED)

ACK. BY

AD5272/AD5274

ACK. BY

AD5272/AD5274

STOP BY

MASTER

R/W

Figure 43. Write Command

SCL

SDA

START BY

MASTER

FRAME 2

MOST SIGNIFICANT DATA BYTE

FRAME 1

SERIAL BUS ADDRESS BYTE

R/W

SCL (CONTINUED)

SDA (CONTINUED)

FRAME 3

LEAST SIGNIFICANT DATA BYTE

SCL (CONTINUED)

SDA (CONTINUED)

STOP BY

MASTER

(CONTINUED)

FRAME 5

LEAST SIGNIFICANT DATA BYTE

C3C2C1

FRAME 4

MOST SIGNIFICANT DATA BYTE

SCL

SDA

ACK. BY

AD5272

2/AD5274

ACK. BY

AD5272

2/AD5274

ACK. BY

AD5272

2/AD5274

ACK. BY

AD5272

2/AD5274

ACK. BY

AD5272

2/AD5274

Figure 44. Multiple Write

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