Data Sheet

AD5251/AD5252

Rev. E | Page 17 of 28

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

SLAVE ADDRESS

(N BYTES + ACKNOWLEDGE)

A/

A

A

X

DATA

Figure 29. 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 30. RDAC or EEMEM Random Read

0 WRITE

1 CMD

S

0

1

0

1

1

A

D

1

A

D

0

0

A

C

3

C

2

C

1

C

0

A

2

A

1

A

0

A

P

RDAC SLAVE ADDRESS

CMD/

REG

FROM MASTER TO SLAVE

FROM SLAVE TO MASTER

S = START CONDITION

P = STOP CONDITION

A = ACKNOWLEDGE (SDA LOW)

A = NOT ACKNOWLEDGE (SDA HIGH)

R/W = READ ENABLE BIT, LOGIC HIGH/WRITE ENABLE BIT, LOGIC LOW

CMD/REG = COMMAND ENABLE BIT, LOGIC HIGH/REGISTER ACCESS BIT, LOGIC LOW

C3, C2, C1, C0 = COMMAND BITS

A2, A1, A0 = RDAC/EEMEM REGISTER ADDRESSES

Figure 31. RDAC Quick Command Write (Dummy Write)