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参数资料
| 型号： | AD5258EVAL2 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 数字电位计 |
| 英文描述： | Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer |
| 中文描述： | 非易失，I2C兼容的64工位，数字电位器 |
| 文件页数： | 17/24页 |
| 文件大小： | 1299K |
| 代理商： | AD5258EVAL2 |
AD5258
WRITE MODES
Rev. 0 | Page 17 of 24
Table 8. Writing to RDAC Register
7-Bit Device Address
(See Table 5)
Slave Address Byte
S
0
SA
0
0
0
0
0
0
0
0
SA
X
X
D5
D4
Data Byte
D3
D2
D1
D0
SA
P
Instruction Byte
Table 9. Writing to EEPROM Register
7-Bit Device Address
(See Table 5)
Slave Address Byte
S
0
SA
0
0
1
0
0
0
0
0
SA
X
X
D5
D4
Data Byte
D3
D2
D1
D0
SA
P
Instruction Byte
The wiper’s default value, prior to programming the EEPROM, is midscale.
Table 10. Activating/Deactivating Software Write Protect
7-Bit Device Address
(See Table 5)
Slave Address Byte
S
0
SA
0
1
0
0
0
0
0
0
SA
0
0
0
0
0
0
0
WP
SA
P
Instruction Byte
Data Byte
In order to activate the write protection mode, the WP bit in Table 10 must be logic high. In order to deactivate the write protection, the
command must be sent again except with the WP in logic zero state.
READ MODES
Read modes are referred to as traditional because the first two
bytes for all three cases are “dummy” bytes which function to
place the pointer towards the correct register. This is the reason
for the repeat start. In theory, this step can be avoided if the
user is interested in reading a register that was previously
Table 11. Traditional Readback of RDAC Register Value
7-Bit Device Address
(See Table 5)
0 SA 0
Slave Address Byte
written to. For example, if the EEPROM was just written to,
then the user can skip the two dummy bytes and proceed
directly to the slave address byte followed by the EEPROM
readback data.
S
0
0
0
0
0
0
0 SA
S
↑
7-Bit Device Address
(See Table 5)
Slave Address Byte
1 SA X
X D5 D4 D3 D2 D1 D0 NA P
Read Back Data
Instruction Byte
Repeat start
Table 12. Traditional Readback of Stored EEPROM Value
7-Bit Device Address
(See Table 5)
0 SA 0
Slave Address Byte
S
0
1
0
0
0
0
0 SA
S
↑
7-Bit Device Address
(See Table 5)
Slave Address Byte
1 SA X
X D5 D4 D3 D2 D1 D0 NA P
Read Back Data
Instruction Byte
Repeat start
STORE/RESTORE MODES
Table 13. Storing RDAC Value to EEPROM
7-Bit Device Address
(See Table 5)
0 SA 1 1 0 0 0 0 0 0 SA P
Slave Address Byte
S
Instruction Byte
Table 14. Restoring EEPROM to RDAC
7-Bit Device Address
(See Table 5)
Slave Address Byte
S
0 SA 1 0 1 0 0 0 0 0 SA P
Instruction Byte
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