EVAL-AD5272SDZ Analog Devices Inc, EVAL-AD5272SDZ Datasheet - Page 19

• Manufacturer Part Number: EVAL-AD5272SDZ
• Description: EVALUATION BOARD
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD5272SDZ

• Main Purpose: Digital Potentiometer
• Embedded: No
• Utilized Ic / Part: AD5272
• Primary Attributes: 1 Channel, 1024 Position
• Secondary Attributes: 2.7 ~ 5.5 V, 5 ppm/°C, I²C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WRITE OPERATION
It is possible to write data for the RDAC register or the control
register. When writing to the AD5272/AD5274, the user must
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.
SDA
SDA
SCL
SCL
START BY
MASTER
START BY
MASTER
0
1
0
1
1
1
SERIAL BUS ADDRESS BYTE
SERIAL BUS ADDRESS BYTE
0
0
SDA
SDA (CONTINUED)
SDA (CONTINUED)
SCL
SCL (CONTINUED)
SCL (CONTINUED)
FRAME 1
SDA (CONTINUED)
SCL (CONTINUED)
FRAME 1
1
1
(CONTINUED)
(CONTINUED)
1
1
A1
A1
A0
A0
Figure 43. Write Command
Figure 44. Multiple Write
Rev. C | Page 19 of 28
R/W
AD5272/AD5274
9
9
9
R/W
AD5272 2 /AD5274
9
ACK. BY
ACK. BY
D7
0
D7
1
1
1
9
D7
1
9
D6
D6
1
0
0
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.
D6
0
1
LEAST SIGNIFICANT DATA BYTE
LEAST SIGNIFICANT DATA BYTE
MOST SIGNIFICANT DATA BYTE
D5
D5
C3
LEAST SIGNIFICANT DATA BYTE
0
D5
0
MOST SIGNIFICANT DATA BYTE
C3
D4
D4
C2
MOST SIGNIFICANT DATA BYTE
C3
D4
FRAME 5
FRAME 3
FRAME 4
FRAME 3
C2
D3
C1
D3
C2
D3
FRAME 2
FRAME 2
C1
D2
D2
C0
C1
D2
C0
D1
D1
D9
C0
D1
AD5272/AD5274
AD5272 2 /AD5274
D9
D0
D0
D8
ACK. BY
D9
D0
ACK. BY
AD5272 2 /AD5274
AD5272 2 /AD5274
ACK. BY
ACK. BY
AD5272/AD5274
D8
9
9
9
AD5272/AD5274
D8
9
AD5272 2 /AD5274
ACK. BY
ACK. BY
STOP BY
MASTER
9
STOP BY
MASTER
9