AD5170 Analog Devices, AD5170 Datasheet - Page 18

• Manufacturer Part Number: AD5170
• Description: 256-Position Two-Time Programmable I2C Digital Potentiometer
• Manufacturer: Analog Devices

AD5170
I
Table 7. Write Mode
Table 8. Read Mode
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.
2
S
S
C INTERFACE
0
0
1
1
Slave Address Byte
Slave Address Byte
0
0
1
1
1 AD1 AD0 W
1 AD1 AD0 R
A
A
D7 D6 D5 D4 D3 D2 D1 D0
2T SD
Instruction Byte
Instruction Byte
T
Rev. 0 | Page 18 of 24
0 OW X
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 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.
X
X
A
A
D7 D6 D5 D4 D3 D2 D1 D0
E1 E0
X
Data Byte
Data Byte
X
X
X
X
X
A
A
P
P