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AD5245BRJ5-R2 数据表(PDF) 11 Page - Analog Devices

部件名 AD5245BRJ5-R2
功能描述  256-Position I2C Compatible Digital Potentiometer
Download  16 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD5245BRJ5-R2 数据表(HTML) 11 Page - Analog Devices

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AD5245
Rev. 0 | Page 11 of 16
I2C INTERFACE
Table 5. 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 6. 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
PS
P
S
t10
t5
t9
t8
SCL
SDA
t2
t6
Figure 36. I2C Interface Detailed Timing Diagram
SCL
FRAME 1
FRAME 2
START BY
MASTER
ACK BY
AD5245
SLAVE ADDRESS BYTE
STOP BY
MASTER
INSTRUCTION BYTE
SDA
0
1
0
1
1
0
AD0
R/W
XRS
X
X
X
X
X
1
9
19
D7
D6
D5
D4
D3
D2
D1
D0
ACK BY
AD5245
FRAME 3
DATA BYTE
1
9
ACK BY
AD5245
SD
Figure 37
. 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
AD5245
SLAVE ADDRESS BYTE
RDAC REGISTER
STOP BY
MASTER
Figure 38. Reading Data from a Previously Selected RDAC Register in Write Mode


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