Data Sheet

AD5259

Rev. C | Page 17 of 24

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

7-Bit Device Address

(See Table 5)

0 SA 0 0 0 0 0 0 0 0 SA S

7-Bit Device Address

(See Table 5)

1 SA D7 D6 D5 D4 D3 D2 D1 D0 NA P

Slave Address Byte

Instruction Byte

Slave Address Byte

Read Back Data

↑

Repeat start

Table 12. Traditional Readback of Stored EEPROM Value

S

7-Bit Device Address

(See Table 5)

0 SA 0 0 1 0 0 0 0 0 SA S

7-Bit Device Address

(See Table 5)

1 SA D7 D6 D5 D4 D3 D2 D1 D0 NA P

Slave Address Byte

Instruction Byte

Slave Address Byte

Read Back Data

↑

Repeat start

STORE/RESTORE MODES

Table 13. Storing RDAC Value to EEPROM

S

7-Bit Device Address

(See Table 5)

0

SA

1

1

0

0

0

0

0

0

SA

P

Slave Address Byte

Instruction Byte

Table 14. Restoring EEPROM to RDAC1

S

7-Bit Device Address

(See Table 5)

0

SA

1

0

1

0

0

0

0

0

SA

P

Slave Address Byte

Instruction Byte