AD5245(Rev0) 查看數據表（PDF） - Analog Devices

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AD5245
(Rev.:Rev0)

256-Position I2C Compatible Digital Potentiometer

Analog Devices 

I2C INTERFACE

AD5245

Table 5. Write Mode

S 0 1 0 1 1 0 AD0 W A X RS SD X X X X X A D7 D6 D5 D4 D3 D2 D1 D0 A P

Slave Address Byte

Instruction Byte

Data Byte

Table 6. Read Mode

S 0 1 0 1 1 0 AD0 R A D7 D6 D5 D4 D3 D2 D1 D0 A P

Slave Address Byte

Data Byte

S = Start Condition

P = Stop Condition

A = Acknowledge

X = Don’t Care

W = Write

R = Read

RS = Reset wiper to Midscale 80H

SD = Shutdown connects wiper to B terminal and open

circuits A terminal. It does not change contents of wiper

register.

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

t8

t9

t2

SCL

t2

SDA

t1

P

S

t6

t3

t4

t7

t5

t9

t8

S

Figure 36. I2C Interface Detailed Timing Diagram

t10

P

SCL

SDA

START BY

MASTER

1

9

1

0

1

0

11

0

FRAME 1

SLAVE ADDRESS BYTE

AD0 R/W

X

ACK BY

AD5245

RS SD X X

X

X

FRAME 2

INSTRUCTION BYTE

9

1

9

X

D7 D6 D5 D4 D3 D2 D1 D0

ACK BY

AD5245

FRAME 3

DATA BYTE

ACK BY

AD5245

STOP BY

MASTER

Figure 37. Writing to the RDAC Register

SCL

SDA

START BY

MASTER

1

9

1

9

01

0

11

0 AD0 R/W

D7 D6 D5 D4 D3 D2 D1 D0

FRAME 1

SLAVE ADDRESS BYTE

ACK BY

AD5245

FRAME 2

RDAC REGISTER

NO ACK

BY MASTER

STOP BY

MASTER

Figure 38. Reading Data from a Previously Selected RDAC Register in Write Mode

Rev. 0 | Page 11 of 16

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