Datasheet

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Data Sheet AD5172/AD5173

Rev. I | Page 21 of 28

C CONTROLLER PROGRAMMING

Write Bit Patterns

SCL

START BY

MASTER

SDA

0 1

FRAME 1

SLAVE ADDRESS BYTE

0 1 1 1 1

FRAME 2

INSTRUCTION BYTE

ACK BY

AD5172

R/W A0 SD 0 OW X X X

D7 D6 D5 D4 D3

ACK BY

AD5172

FRAME 3

DATA BYTE

STOP BY

MASTER

D2 D1 D0

ACK BY

AD5172

04103-040

Figure 48. Writing to the RDAC Register—AD5172

SCL

START BY

MASTER

SDA

0 1

FRAME 1

SLAVE ADDRESS BYTE

0 1 1 AD1 AD0

FRAME 2

INSTRUCTION BYTE

ACK BY

AD5173

R/W A0 SD 0 OW X X X

D7 D6 D5 D4 D3

ACK BY

AD5173

FRAME 3

DATA BYTE

STOP BY

MASTER

D2 D1 D0

ACK BY

AD5173

04103-041

Figure 49. Writing to the RDAC Register—AD5173

Read Bit Patterns

SCL

START BY

MASTER

SDA

0 1

FRAME 1

SLAVE ADDRESS BYTE

0 1 1 1 1

FRAME 2

INSTRUCTION BYTE

ACK BY

AD5172

R/W D7 D6 D4 D3 D2 D1 D0

E1 E0 X X X

ACK BY

MASTER

FRAME 3

DATA BYTE

STOP BY

MASTER

X X X

NO ACK

BY MASTER

04103-042

Figure 50. Reading Data from a Previously Selected RDAC Register in Write Mode—AD5172

SCL

START BY

MASTER

SDA

0 1

FRAME 1

SLAVE ADDRESS BYTE

0 1 1 AD1 AD0

FRAME 2

INSTRUCTION BYTE

ACK BY

AD5173

R/W D7 D6 D4 D3 D2 D1 D0

E1 E0 X X X

ACK BY

MASTER

FRAME 3

DATA BYTE

STOP BY

MASTER

X X X

ACK

Y MASTER

04103-043

Figure 51. Reading Data from a Previously Selected RDAC Register in Write Mode—AD5173