AD5175

Rev. 0 | Page 13 of 20

WRITE OPERATION

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

register. When writing to the AD5175, the user must begin with

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

which the AD5175 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 AD5175. A stop

condition follows. The write operations for the AD5175 are

shown in Figure 25.

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 26.

SCL

SDA

START BY

MASTER

ACK. BY

AD5175

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

MOST SIGNIFICANT DATA BYTE

FRAME 3

LEAST SIGNIFICANT DATA BYTE

SCL (CONTINUED)

SDA (CONTINUED)

ACK. BY

AD5175

ACK. BY

AD5175

STOP BY

MASTER

0

19

1

99

9

1

1

01

1

A1

A0

0

0

C3

C2

C1

C0

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

R/W

Figure 25. Write Command