AD5263

Data Sheet

Rev. F | Page 16 of 28

The word format maps in this section use the following abbreviations.

Abbreviation

Description

S

Start condition.

P

Stop condition.

A

Acknowledge.

AD1, AD0

A1, A0

RDAC channel select.

RS

Software reset wiper (A1, A0) to midscale position.

SD

Shutdown active high; ties wiper (A1, A0) to Terminal B, opens Terminal A, RDAC register contents are not disturbed.

To exit shutdown, the command SD = 0 must be executed for each RDAC (A1, A0).

O1, O2

determined by V

W

Write = 0.

R

Read = 1.

D7, D6, D5, D4, D3,

D2, D1, D0

Data bits.

X

Don’t care.

S

0

1

0

1

1

AD1

AD0

W

A

X

A1

A0

RS

SD

O1

O2

X

A

D7

D6

D5

D4

D3

D2

D1

D0

A

P

Slave Address Byte

Instruction Byte

Data Byte

S

0

1

0

1

1

AD1

AD0

R

A

D7

D8

D5

D4

D3

D2

D1

D0

A

P

Slave Address Byte

Data Byte

SCL

SDA

P

S

P

S

SCL

START BY

MASTER

ACK BY

AD5263

STOP BY

MASTER

SDA

0

1

0

1

1

AD1 AD0 R/W

X

A1

RS

SD

O1

O2

X

1

9

1

9

D7

D6

D5

D4

D3

D2

D1

D0

ACK BY

AD5263

1

9

ACK BY

AD5263

A0

FRAME 1

SLAVE ADDRESS BYTE

FRAME 1

INSTRUCTION BYTE

FRAME 1

DATABYTE

Figure 43

. Writing to the RDAC Register

NO ACK

BY MASTER

SCL

SDA

0

1

0

1

1

AD1 AD0 R/W

D7

D6

D5

D4

D3

D2

D1

D0

1

9

1

9

FRAME 1

FRAME 2

START BY

MASTER

ACK BY

AD5263

SLAVE ADDRESS BYTE

RDAC REGISTER

STOP BY

MASTER

Figure 44. Reading Data from a Previously Selected RDAC Register in Write Mode