AD5259

Preliminary Technical Data

Rev. PrJ 7/22/04 | Page 7 of 14

Read Modes

Table 11. Traditional Read back of RDAC Register value

S

Device Address*

(7-bit)

0

SA

0

0

0

0

0

0

0

0

SA

S

Device Address*

(7-bit)

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 Read back of stored EEPROM value

S

Device Address*

(7-bit)

0

SA

0

0

1

0

0

0

0

0

SA

S

Device Address*

(7-bit)

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 13. Traditional Read back of Tolerance

i. Consecutively

S

Device

Address*

(7-bit)

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

Device

Address*

(7-bit)

1 SA D7 D6 D5 D4 D3 D2 D1

D

0 MA D7 D6 D5 D4 D3 D2 D1 D0 NA P

Slave Address

Byte

Instruction Byte

Slave Address

Byte

Sign + Integer Byte

Decimal Byte

↑

Repeat start

ii. Individually

S

Device

Address*

(7-bit)

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

Device

Address*

(7-bit)

1 SA D7 D6 D5 D4 D3 D2 D1

D

0

NA

P

Slave Address

Byte

Instruction Byte

Slave Address

Byte

Sign + Integer Byte

↑

Repeat start

S

Device

Address*

(7-bit)

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

Device

Address*

(7-bit)

1 SA D7 D6 D5 D4 D3 D2 D1

D

0

NA

P

Slave Address

Byte

Instruction Byte

Slave Address

Byte

Decimal Byte

↑

Repeat start

Note: Read modes above 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 written to. For example, if the EEPROM was just written to, then the user can skip the