AD5243 AD [Analog Devices], AD5243 Datasheet - Page 17

• Manufacturer Part Number: AD5243
• Description: Dual 256-Position I2C Compatible Digital Potentiometer
• Manufacturer: AD [Analog Devices]

Table 9. Write Mode
AD5243
S
AD5248
S
Table 10. Read Mode
AD5243
S
AD5248
S
LEGEND
S = Start condition.
P = Stop condition.
A = Acknowledge.
X = Don’t care.
W = Write.
AD0, AD1 = Package pin
programmable address bits.
0
0
0
0
START BY
MASTER
1
SCL
SDA
1
1
Slave Address Byte
0
1
0
SCL
SDA
Slave Address Byte
1
1
P
0
0
1
0
1
t
Slave Address Byte
1
1
SLAVE ADDRESS BYTE
1
Slave Address Byte
1
S
AD1
1
1
FRAME 1
0
R = Read.
A0 = RDAC subaddress select bit.
SD = Shutdown connects wiper to B terminal and
D7, D6, D5, D4, D3, D2, D1, D0 = Data bits.
t
1
open circuits A terminal. It does not change contents
of wiper register.
2
1
1
AD0
1
W
AD1
1
1
t
3
W
A
1
1
A
t
A0
1
8
AD0
t
8
R/W
A0
Figure 46. Writing to the RDAC Register—AD5243
Figure 45. I
R
SD
t
ACK BY
AD5243
9
9
SD
Instruction Byte
R
A0
t
X
A
1
6
Instruction Byte
2
X
C Interface Detailed Timing Diagram
SD
X
t
A
4
Rev. 0 | Page 17 of 20
t
9
D7
INSTRUCTION BYTE
X
X
X
D7
FRAME 2
X
X
X
D6
X
X
X
t
7
D6
X
X
X
D5
X
X
A
D5
X
A
S
ACK BY
AD5243
D7
9
D4
t
D7
5
Data Byte
D4
D7
1
D6
Data Byte
D6
D6
D3
t
2
D5
D3
D5
D5
DATA BYTE
FRAME 3
D4
D4
Data Byte
D2
Data Byte
D4
D2
D3
D3
D2
D3
D1
AD5243/AD5248
D1
D1
D2
D2
D0
ACK BY
AD5243
D0
D1
D0
D1
P
9
STOP BY
MASTER
t
10
D0
D0
A
A
A
A
P
P
P
P