Datasheet

AD5172/AD5173 Data Sheet
Rev. I | Page 20 of 28
I
2
C INTERFACE
WRITE MODE
Table 10. AD5172 Write Mode
S 0 1 0 1 1 1 1
W
A A0 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 11. AD5173 Write Mode
S 0 1 0 1 1 AD1 AD0
W
A A0 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
READ MODE
Table 12. AD5172 Read Mode
S 0 1 0 1 1 1 1 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
Table 13. AD5173 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
Table 14. SDA Bits Descriptions
Bit Description
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 the
contents of the wiper register.
T OTP programming bit. Logic 1 programs the wiper permanently.
OW Overwrites the fuse setting and programs the digital potentiometer to a different setting. Upon
power-up, the digital potentiometer is preset to either midscale or fuse setting, depending on
whether the fuse link was blown.
D7, D6, D5, D4, D3, D2, D1, D0 Data bits.
E1, E0 OTP validation bits.
00 = ready to program.
10 = fatal error. Some fuses not blown. Do not retry. Discard this unit.
11 = programmed successfully. No further adjustments are possible.