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AD5241BRU10 数据表(PDF) 5 Page - Analog Devices

部件名 AD5241BRU10
功能描述  I2C-Compatible, 256-Position Digital Potentiometers
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD5241BRU10 数据表(HTML) 5 Page - Analog Devices

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AD5241/AD5242
Rev. C | Page 5 of 20
TIMING DIAGRAMS
t8
t1
t8
t3
t2
t2
t9
t5
SDA
SCL
t10
S
P
t7
t4
S
P
t6
Figure 3. Detail Timing Diagram
Data of AD5241/AD5242 is accepted from the I2C bus in the following serial format.
Table 2.
S
0
1
0
1
1
AD1
AD0
R/W
A
A/B
RS
SD
O1
O2
X
X
X
A
D7
D6
D5
D4
D3
D2
D1
D0
A
P
Slave Address Byte
Instruction Byte
Data Byte
where:
S = start condition
P = stop condition
A = acknowledge
X = don’t care
AD1, AD0 = Package pin programmable address bits. Must be matched with the logic states at Pins AD1 and AD0.
R/W = Read enable at high and output to SDA. Write enable at low.
A/B = RDAC subaddress select; 0 for RDAC1 and 1 for RDAC2.
RS = Midscale reset, active high.
SD = Shutdown in active high. Same as SHDN except inverse logic.
O1, O2 = Output logic pin latched values
D7, D6, D5, D4, D3, D2, D1, D0 = data bits.
1
1
1
9
9
9
0
1
0
1
A/B
D0
D4
D5
D6
D7
D3
D2
D1
ACK BY
AD5241
ACK BY
AD5241
ACK BY
AD5241
STOP BY
MASTER
START BY
MASTER
FRAME 1
SLAVE ADDRESS BYTE
FRAME 2
INSTRUCTION BYTE
FRAME 3
DATA BYTE
SDA
1
AD1
AD0
R/W
SCL
X
X
X
2
1
SD
RS
O
O
Figure 4. Writing to the RDAC Serial Register
1
9
1
9
0
1
0
11
D7
ACK BY
AD5241
NO ACK BY
MASTER
STOP BY
MASTER
START BY
MASTER
FRAME 1
SLAVE ADDRESS BYTE
FRAME 2
DATA BYTE FROM PREVIOUSLY SELECTED
RDAC REGISTER IN WRITE MODE
SCL
SDA
D6
D5
D4
D3
D2
D1
D0
AD1
AD0
R/W
Figure 5. Reading Data from a Previously Selected RDAC Register in Write Mode


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