AD5251/AD5252

Rev. 0 | Page 12 of 28

Table 7. Addresses for Writing (Storing) RDAC Settings and

User-Defined Data to EEMEM Registers (R/W = 0,

CMD/REG = 0, EE/RDAC = 1)

A4

A3

A2

A1

A0

Data Byte Description

0

0

0

0

0

Reserved

0

0

0

0

1

Store RDAC1 setting to

0

0

0

1

0

Reserved

0

0

0

1

1

Store RDAC3 setting to

0

0

1

0

0

Store user data to EEMEM4

0

0

1

0

1

Store user data to EEMEM5

0

0

1

1

0

Store user data to EEMEM6

0

0

1

1

1

Store user data to EEMEM7

0

1

0

0

0

Store user data to EEMEM8

0

1

0

0

1

Store user data to EEMEM9

0

1

0

1

0

Store user data to EEMEM10

0

1

0

1

1

Store user data to EEMEM11

0

1

1

0

0

Store user data to EEMEM12

0

1

1

0

1

Store user data to EEMEM13

0

1

1

1

0

Store user data to EEMEM14

0

1

1

1

1

Store user data to EEMEM15

RDAC settings for AD5252.

RDAC/EEMEM Read

The AD5251/AD5252 provide two different RDAC or EEMEM

read operations. For example, Figure 9 shows the method of

reading the RDAC0 to RDAC3 contents without specifying the

address, assuming Address RDAC0 was already selected from

the previous operation. If RDAC_N, other than Address 0, is

selected previously, readback starts with Address N, followed by

N + 1, and so on.

Figure 10 illustrates a random RDAC or EEMEM read

operation. This operation lets users specify which RDAC or

EEMEM register is read by first issuing a dummy write

command to change the RDAC address pointer, and then

proceeding with the RDAC read operation at the new address

location.

Table 8. Addresses for Reading (Restoring) RDAC Settings

and User Data from EEMEM (R/W = 1, CMD/REG = 0,

EE/RDAC = 1)

A4

A3

A2

A1

A0

Data Byte Description

0

0

0

0

0

Reserved

0

0

0

0

1

Read RDAC1 Setting from

EEMEM1

0

0

0

1

0

Reserved

0

0

0

1

1

Read RDAC3 Setting from

EEMEM3

0

0

1

0

0

Read user data from EEMEM4

0

0

1

0

1

Read user data from EEMEM5

0

0

1

1

0

Read user data from EEMEM6

0

0

1

1

1

Read user data from EEMEM7

0

1

0

0

0

Read user data from EEMEM8

0

1

0

0

1

Read user data from EEMEM9

0

1

0

1

0

Read user data from EEMEM10

0

1

0

1

1

Read user data from EEMEM11

0

1

1

0

0

Read user data from EEMEM12

0

1

1

0

1

Read user data from EEMEM13

0

1

1

1

0

Read user data from EEMEM14

0

1

1

1

1

Read user data from EEMEM15

1 READ

S

0

1

0

1

1

A

D

1

A

D

0

1

A

P

A

RDAC1

EEMEM OR REGISTER DATA

RDAC3

EEMEM OR REGISTER DATA

RDAC SLAVE ADDRESS

(N BYTES + ACKNOWLEDGE)

A

Figure 9. RDAC Current Read (Restricted to Previously Selected Address Stored in the Register).

P

S

SLAVE ADDRESS

0 WRITE

SLAVE ADDRESS

INSTRUCTION AND

ADDRESS

A

1

S

REPEATED START

1 READ

A

0A

(N BYTES + ACKNOWLEDGE)

RDAC OR

EEMEM DATA

A/A

Figure 10. RDAC or EEMEM Random Read