ad5259 Analog Devices, Inc., ad5259 Datasheet - Page 17

• Manufacturer Part Number: ad5259
• Description: Nonvolatile, I2c-compatible 256-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, which function to place the
pointer towards the correct register; this is the reason for the repeat start. Theoretically, this step can be avoided if the user reads a register
previously written to. For example, if the EEPROM was just written to, the user can then skip the two dummy bytes and proceed directly
to the slave address byte, followed by the EEPROM readback data.
Table 11. Traditional Readback of RDAC Register Value
S
Table 12. Traditional Readback of Stored EEPROM Value
STORE/RESTORE MODES
Table 13. Storing RDAC Value to EEPROM
S
Table 14. Restoring EEPROM to RDAC
S
S
7-Bit Device Address
(See Table 5)
Slave Address Byte
7-Bit Device Address
(See Table 5)
Slave Address Byte
7-Bit Device Address
(See Table 5)
Slave Address Byte
7-Bit Device Address
(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
0
0
SA
SA
1
Instruction Byte
1
Instruction Byte
Repeat start
Repeat start
Rev. A | Page 17 of 24
↑
↑
1
0
7-Bit Device Address
(See Table 5)
Slave Address Byte
7-Bit Device Address
(See Table 5)
Slave Address Byte
0
1
0
0
0
0
1 SA D7 D6 D5 D4 D3 D2 D1 D0 NA P
1 SA D7 D6 D5 D4 D3 D2 D1 D0 NA P
0
0
Read Back Data
Read Back Data
0
0
0
0
SA
SA
AD5259
P
P