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参数资料
| 型号： | AD5255BRU25-RL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 数字电位计 |
| 英文描述： | 3-Channel Digital Potentiometer with Nonvolatile Memory |
| 中文描述： | TRIPLE 25K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 512 POSITIONS, PDSO24 |
| 封装： | MO-153AD, TSSOP-24 |
| 文件页数： | 12/20页 |
| 文件大小： | 626K |
| 代理商： | AD5255BRU25-RL7 |
AD5255
A random read operation is shown in Figure 21. This operation
changes the address counter to the specified memory address by
performing a
dummy write
and then performing a read
operation beginning at the new address counter location.
Rev. 0 | Page 12 of 20
EEPROM Write Protection
Setting the WP pin to a logic low protects the EEPROM
memory from future write operations. In this mode, EEPROM
read operations and RDAC register loading operate normally.
RDAC I
2
C INTERFACE
DATA
DATA
S
A
A
A
A
0
R
A
1
R
1
0
0
EE/
RD
AC
A
4
A
3
A
2
A
1
A
0
CMD/
REG
1
1
0
0
P
0
0 WRITE
(N BYTES + ACKNOWLEDGE)
RDAC ADDRESS
RDAC SLAVE ADDRESS
A/A
Figure 22. RDAC Write
S
A
A
0
R
A
1
R
1
1
A
RDAC EEPROM OR REGISTER DATA
RDAC EEPROM OR REGISTER DATA
1
1
0
0
P
0
1 READ
(N BYTES + ACKNOWLEDGE)
RDAC SLAVE ADDRESS
A
Figure 23. RDAC Current Read
SLAVE ADDRESS
RDAC ADDRESS
S
0 WRITE
A
A
P
0
W
SLAVE ADDRESS
RDAC DATA
S
R
1 READ
REPEATED START
A
(N BYTES + ACKNOWLEDGE)
A/A
Figure 24. RDAC Random Read
S
A
A
0
R
A
1
R
1
0
C
1
C
2
C
3
C
0
A
2
A
1
A
0
CMD/
REG
1
1
0
0
P
0
A
0 WRITE
1 CMD
RDAC SLAVE ADDRESS
Figure 25. RDAC Shortcut Command
Table 5. RDAC Register Addresses (CMD/REG = 0, EE/RDAC = 0)
A4
A3
A2
A1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
1
0
0
0
1
0
…to…
1
1
1
1
A0
0
1
0
1
0
1
RDAC
RDAC0
RDAC0
RDAC1
RDAC1
RDAC2
Byte Description
(D7)(D6)(D5)(D4)(D3)(D2)(D1)(D0) – RDAC0 8 LSBs
(X)(X)(X)(X)(X)(X)(X)(D8) – RDAC0 MSB
(D7)(D6)(D5)(D4)(D3)(D2)(D1)(D0) – RDAC1 8 LSBs
(X)(X)(X)(X)(X)(X)(X)(D8) – RDAC1 MSB
(X)(D6)(D5)(D4)(D3)(D2)(D1)(D0) – RDAC2 7 bits
Reserved
1
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