AD5172 datasheet(18/24 Pages) AD

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AD5172/AD5173

Rev. A | Page 18 of 24

I2C INTERFACE

Table 7. Write Mode

AD5172

A0 SD

D7 D6 D5 D4 D3 D2 D1 D0

Slave Address Byte

Instruction Byte

Data Byte

AD5173

1 AD1 AD0 W

A0 SD

OW X

D7 D6 D5 D4 D3 D2 D1 D0

Slave Address Byte

Instruction Byte

Data Byte

Table 8. Read Mode

AD5172

D7 D6 D5 D4 D3 D2 D1 D0

Slave Address Byte

Instruction Byte

Data Byte

AD5173

1 AD1 AD0 R

D7 D6 D5 D4 D3 D2 D1 D0

Slave Address Byte

Instruction Byte

Data Byte

S = Start Condition

P = Stop Condition

A = Acknowledge

AD0, AD1 = Package Pin Programmable Address Bits

X = Don’t Care

W = Write

R = Read

A0 = RDAC Subaddress Select Bit

SD = Shutdown connects wiper to B terminal and open circuits

the A terminal. It does not change contents of wiper register.

T = OTP Programming Bit. Logic 1 programs the wiper

permanently.

OW = Overwrite the fuse setting and program the digital

potentiometer to a different setting. Note that upon power-up,

the digital potentiometer is preset to either midscale or fuse

setting, depending on whether not the fuse link has been blown.

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

E1, E0 = OTP Validation Bits.

0, 0 = Ready to Program.

1, 0 = Fatal Error. Some fuses not blown. Do not retry. Discard

this unit.

1, 1 = Programmed Successfully. No further adjustments

possible.

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