ad5258 Analog Devices, Inc., ad5258 Datasheet - Page 17

• Manufacturer Part Number: ad5258
• Description: Nonvolatile, I2c-compatible 64-position, Digital Potentiometer
• Manufacturer: Analog Devices, Inc.

READ MODES
Read modes are referred to as traditional because the first two
bytes for all three cases are dummy bytes that function to place
the pointer toward the correct register. This is the reason for the
repeat start. In theory, this step can be avoided if the user is
Table 11. Traditional Readback of RDAC Register Value
Table 12. Traditional Readback of Stored EEPROM Value
STORE/RESTORE MODES
Table 13. Storing RDAC Value to EEPROM
Table 14. Restoring EEPROM to RDAC
S
S
S
S
7-Bit Device Address
7-Bit Device Address
Slave Address Byte
Slave Address Byte
(See Table 5)
(See Table 5)
7-Bit Device Address
7-Bit Device Address
(See Table 5)
Slave Address Byte
(See Table 5)
Slave Address Byte
0 SA 0 0 0 0 0 0 0 0 SA S
0 SA 0 0 1 0 0 0 0 0 SA S
Instruction Byte
Instruction Byte
Repeat Start
Repeat Start
0
Rev. A | Page 17 of 24
0
↑
↑
S A
S A
7-Bit Device Address
7-Bit Device Address
Slave Address Byte
Slave Address Byte
(See Table 5)
1
interested in reading a register that was previously written to.
For example, if the EEPROM was just written to, the user can
skip the two dummy bytes and proceed directly to the slave
address byte followed by the EEPROM readback data.
(See Table 5)
1
1
0
0
Instruction Byte
1
0
Instruction Byte
0
1 SA X X D5 D4 D3 D2 D1 D0 NA P
1 SA X X D5 D4 D3 D2 D1 D0 NA P
0
0
0
0
0
Read-back Data
Read-back Data
0
0
0
S A
S A
AD5258
P
P