AD5241(RevB) 查看數據表（PDF） - Analog Devices

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AD5241
(Rev.:RevB)

I2C® Compatible 256-Position Digital Potentiometers

Analog Devices 

AD5241/AD5242

t8

SDA

t1

t8

t9

t2

SCL

t2

P

S

t3

t4

t6

t7

t5

S

Figure 1. Detail Timing Diagram

t10

P

Data of AD5241/AD5242 is accepted from the I2C bus in the following serial format:

S 0 1 0 1 1 AD1 AD0 R/W A A/B RS SD O1 O2 X X X A D7 D6 D5 D4 D3 D2 D1 D0 A P

SLAVE ADDRESS BYTE

INSTRUCTION BYTE

DATA BYTE

where:

S = Start Condition

P = Stop Condition

A = Acknowledge

X = Don’t Care

AD1, AD0 = Package pin programmable address bits. Must be matched with the logic states at Pins AD1 and AD0.

R/W = Read Enable at High and output to SDA. Write Enable at Low.

A/B = RDAC subaddress select. ‘0’ for RDAC1 and ‘1’ for RDAC2.

RS = Midscale reset, active high.

SD = Shutdown in active high. Same as SHDN except inverse logic.

O1, O2 = Output logic pin latched values.

D7, D6, D5, D4, D3, D2, D1, D0 = Data Bits.

SCL

SDA

START BY

MASTER

1

9

1

9

1

9

0

10

1

1 AD1 AD0 R/W

A/B RS SD O1 O2 X

XX

D7 D6 D5 D4 D3 D2 D1 D0

FRAME 1

SLAVE ADDRESS BYTE

ACK BY

AD5241

FRAME 2

INSTRUCTION BYTE

ACK BY

AD5241

FRAME 3

DATA BYTE

ACK BY

AD5241

STOP BY

MASTER

Figure 2. Writing to the RDAC Serial Register

1

9

1

9

SCL

SDA

START BY

MASTER

0

10

1

1 AD1 AD0 R/W

D7 D6 D5 D4 D3 D2 D1 D0

FRAME 1

SLAVE ADDRESS BYTE

ACK BY

AD5241

NO ACK BY

MASTER

FRAME 2

DATA BYTE FROM PREVIOUSLY SELECTED

STOP BY

MASTER

RDAC REGISTER IN WRITE MODE

Figure 3. Reading Data from a Previously Selected RDAC Register in Write Mode

–6–

REV. B

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