Datasheet

AD5175
Rev. A | 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
91
1
011A1A0 00C3C2
C1 C0
D9 D8
D7 D6 D5 D4 D3 D2 D1 D0
R/W
0
8719-005
Figure 25. Write Command