ad5258 Analog Devices, Inc., ad5258 Datasheet - Page 16

• Manufacturer Part Number: ad5258
• Description: Nonvolatile, I2c-compatible 64-position, Digital Potentiometer
• Manufacturer: Analog Devices, Inc.

AD5258
I
The following generic, write, read, and store/restore control
registers for the AD5258 refer to the device addresses listed in
Table 5, and following is the mode/condition reference key.
•
•
•
•
•
•
•
•
•
GENERIC INTERFACE
Table 6. Generic Interface Format
Table 7. RDAC-to-EEPROM Interface Command Descriptions
C2
0
0
0
1
1
1
WRITE MODES
Table 8. Writing to RDAC Register
Table 9. Writing to EEPROM Register
The wiper’s default value prior to programming the EEPROM is midscale.
Table 10. Activating/Deactivating Software Write Protect
To activate the write protection mode, the WP bit in Table 10 must be logic high. To deactivate the write protection, the command must
be resent except with the WP in logic zero state.
S
S
S
S
2
C BYTE FORMATS
S = Start Condition
P = Stop Condition
SA = Slave Acknowledge
MA = Master Acknowledge
NA = No Acknowledge
W = Write
R = Read
X = Don’t Care
AD1 and AD0 are two-state address pins.
7-Bit Device Address
C1
0
0
1
0
0
1
(See Table 5)
Slave Address Byte
7-Bit Device Address
7-Bit Device Address
7-Bit Device Address
Slave Address Byte
(See Table 5)
(See Table 5)
Slave Address Byte
(See Table 5)
C0
0
1
0
0
1
0
Slave Address Byte
Command Description
Operation between I
Operation between I
Operation between I
NOP
Restore EEPROM to RDAC
Store RDAC to EEPROM
R/W SA C2 C1 C0 A4 A3 A2 A1 A0 SA D7 D6 D5 D4 D3 D2 D1 D0 SA P
0
SA
0
0
2
2
2
C and RDAC
C and EEPROM
C and Write Protection Register. See Table 10.
SA
0
SA
0
Instruction Byte
0
0
Instruction Byte
1
Rev. A | Page 16 of 24
0
1
0
Instruction Byte
0
Instruction Byte
0
0
0
0
0
0
0
0
Table 5. Device Address Lookup
AD1 Address Pin
0
1
0
1
0
0
0
0 0
SA
0
0
SA
X
SA
X
X X
D5
0
AD0 Address Pin
0
0
1
1
D5
0
D4
0
Data Byte
D4
Data Byte
Data Byte
D3
0
Data Byte
D3
0
D2
0
D2
I
0011000
0011010
1001100
1001110
2
0
D1
C Device Address
D1
WP
D0
D0
SA
SA
SA
P
P
P