ad5171 Analog Devices, Inc., ad5171 Datasheet - Page 17

• Manufacturer Part Number: ad5171
• Description: 64-position Otp Digital Potentiometer
• Manufacturer: Analog Devices, Inc.

Table 7. SDA Write Mode Bit Format
S
Table 8. SDA Read Mode Bit Format
S
Table 9. SDA Bits Definitions and Descriptions
Bit
S
P
A
AD0
X
T
D5, D4, D3, D2, D1, D0
E1, E0
0, 0
0, 1
1, 0
1, 1
I
Write Bit Patterns
Read Bit Pattern
2
C CONTROLLER PROGRAMMING
0
START BY
START BY
0
MASTER
MASTER
1
SCL
SDA
SCL
SDA
Slave Address Byte
0
1
1
1
0
1
0
0
1
1
1
START BY
Slave Address Byte
SLAVE ADDRESS BYTE
SLAVE ADDRESS BYTE
MASTER
0
0
Description
Start Condition.
Stop Condition.
Acknowledge.
I
Don’t Care.
OTP Programming Bit. Logic 1 programs the wiper position permanently.
Data Bits.
OTP Validation Bits.
Ready to Program.
Test Fuse Not Blown Successfully. For factory setup checking purpose only. Users should not see these
combinations.
Fatal Error. Do not retry. Discard the unit.
Programmed Successfully. No further adjustments are possible.
0
1
2
C Device Address Bit. Allows a maximum of two AD5171s to be addressed.
SCL
SDA
FRAME 1
FRAME 1
1
AD0
1
1
1
1
1
0
0
0
0 AD0 R/W
1
AD0 R/W
0
SLAVE ADDRESS BYTE
A
0
T
ACK. BY
ACK. BY
FRAME 1
AD5171
AD5171
1
AD0
Figure 37. Activating One-Time Programming
Figure 38. Reading Data from RDAC Register
9
9
X
Figure 36. Writing to the RDAC Register
1
1
0
1
1
1
Instruction Byte
X
0 AD0
X
X
Rev. B | Page 17 of 24
X
X
X
INSTRUCTION BYTE
INSTRUCTION BYTE
A
R/W
ACK. BY
X
AD5171
X
X
FRAME 2
FRAME 2
9
X
X
X
E1
E1
1
X
X
X
E0
E0
X
X
X
D5
RDAC REGISTER
X
X
D4
ACK. BY
FRAME 2
A
ACK. BY
AD5171
D5
AD5171
9
9
D3
X
1
X
1
X
D2
D4
Data Byte
X
X
X
D1
D5
D5
D5
D3
D0
NO ACK. BY
D4
DATA BYTE
D4
MASTER
DATA BYTE
FRAME 1
FRAME 1
9
D4
Data Byte
D3
D3
D2
STOP BY
MASTER
D2
D2
D3
D1
D1
D1
D2
D0
D0
ACK. BY
ACK. BY
AD5171
AD5171
D0
D1
9
9
STOP BY
MASTER
STOP BY
MASTER
D0
AD5171
A
A
P
P