AD5170BRM2.5-RL7(RevA) View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD5170BRM2.5-RL7
(Rev.:RevA)

256-Position Two-Time Programmable I2C Digital Potentiometer

Analog Devices 

AD5170

I2C INTERFACE

Table 7. Write Mode

S 0 1 0 1 1 AD1 AD0 W A 2T SD T 0 OW X X X A D7 D6 D5 D4 D3 D2 D1 D0 A P

Slave Address Byte

Instruction Byte

Data Byte

Table 8. Read Mode

S 0 1 0 1 1 AD1 AD0 R A D7 D6 D5 D4 D3 D2 D1 D0 A E1 E0 X X X X X X A P

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.

2T = Second fuse link array for two-time programming. Logic 0

corresponds to first trim. Logic 1 corresponds to second trim.

Note that blowing trim #2 before trim #1 effectively disables

trim #1 and in turn only allows one-time programming.

SD = Shutdown connects wiper to B terminal and open circuits

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

register.

T = OTP Programming Bit. Logic 1 permanently programs the

wiper.

OW = Overwrite the fuse setting and program the digital

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

the digital potentiometer presets to either midscale or fuse

setting depending on whether 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 are

possible.

Rev. A | Page 18 of 24

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