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AD5161BRM5 Datasheet(PDF) 14 Page - Analog Devices

Part No. AD5161BRM5
Description  256-Position SPI/I2C Selectable Digital Potentiometer
Download  20 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD5161BRM5 Datasheet(HTML) 14 Page - Analog Devices

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AD5161
Data Sheet
Rev. B | Page 14 of 20
I2C INTERFACE
Table 7. Write Mode
S 0 1 0 1 1 0
AD0
W A X
RS
SD
X X X X X A
D7
D6
D5
D4
D3
D2
D1
D0
A P
Slave Address Byte
Instruction Byte
Data Byte
Table 8. Read Mode
S
0
1
0
1
1
0
AD0
R
A
D7
D6
D5
D4
D3
D2
D1
D0
A
P
Slave Address Byte
Data Byte
S = Start Condition
P = Stop Condition
A = Acknowledge
X = Don’t Care
W = Write
R = Read
RS = Reset wiper to Midscale 80H
SD = Shutdown connects wiper to B terminal and open circuits
A terminal. It does not change contents of wiper register.
D7, D6, D5, D4, D3, D2, D1, D0 = Data Bits.
t1
t3
t4
t2
t7
t8
t9
P
S
P
S
t10
t5
t9
t8
SCL
SDA
t2
t6
Figure 39. I2C Interface Detailed Timing Diagram
SCL
FRAME 1
FRAME 2
START BY
MASTER
ACK BY
AD5161
SLAVE ADDRESS BYTE
STOP BY
MASTER
INSTRUCTION BYTE
SDA
0
1
0
1
1
0
AD0
R/W
X
RS
X
X
X
X
X
1
9
1
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK BY
AD5161
FRAME 3
DATA BYTE
1
9
ACK BY
AD5161
SD
Figure 40. Writing to the RDAC Register
NO ACK
BY MASTER
SCL
SDA
0
1
0
1
1
0
AD0
R/W
D7
D6
D5
D4
D3
D2
D1
D0
1
9
1
9
FRAME 1
FRAME 2
START BY
MASTER
ACK BY
AD5161
SLAVE ADDRESS BYTE
RDAC REGISTER
STOP BY
MASTER
Figure 41. Reading Data from a Previously Selected RDAC Register in Write Mode


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