AD5232 Analog Devices, AD5232 Datasheet - Page 9

• Manufacturer Part Number: AD5232
• Description: 2-Channel/ 256-Position Digital Potentiometer
• Manufacturer: Analog Devices

Inst
No.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
NOTES
1. The SDO output shifts out the last eight bits of data clocked into the serial register for daisy-chain operation. Exception: following Instruction #9 or #10 the selected internal
2. The RDAC register is a volatile scratch pad register that is refreshed at power-on from the corresponding nonvolatile EEMEM register.
3. The increment, decrement, and shift commands ignore the contents of the shift register Data Byte 0.
4. Execution of the Operation column noted in the table takes place when the CS strobe returns to logic high.
5. Execution of a NOP instruction minimizes power dissipation.
register data will be present in data byte 0. Instructions following #9 and #10 must be a full 16-bit data word to completely clock out the contents of the serial register.
Instruction Byte 1
B15
C3 C2 C1 C0 A3 A2 A1 A0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
0
0
0
X
0
X
0
0
0
0
X
0
X
<< ADDR >>
<< ADDR >>
X
0
0
0
X
0
X
0
0
0
0
X
0
X
X
0
0
0
X
0
X
0
0
0
0
X
0
X
B8
X
A0
A0
A0
X
A0
X
0
A0
A0
A0
X
A0
X
Table III. Instruction/Operation Truth Table
Data Byte 0
B7
D7 D6 D5 D4 D3 D2 D1 D0
X
X
X
D7 D6 D5 D4 D3 D2 D1 D0
X
X
X
X
X
X
X
D7 D6 D5 D4 D3 D2 D1 D0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X X
X X
X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
B0
Operation
No Operation (NOP). Do nothing.
Write contents of EEMEM(A0) to
RDAC(A0) Register. This command
leaves device in the Read Program power
state. To return part to the idle state,
perform NOP instruction #0.
SAVE WIPER SETTING. Write con-
tents of RDAC(ADDR) to EEMEM(A0)
Write contents of Serial Register Data
Byte 0 to EEMEM(ADDR).
Decrement 6 dB right shift contents of
RDAC(A0), stops at all “Zeros.”
Decrement All 6 dB right shift contents
of all RDAC Registers, stops at all “Zeros.”
Decrement contents of RDAC(A0) by
“One,” stops at all “Zeros.”
Decrement contents of all RDAC Regis-
ters by “One,” stops at all “Zeros.”
RESET. Load all RDACs with their cor-
responding EEMEM previously-saved
values.
Write contents of EEMEM(ADDR) to
Serial Register Data Byte 0.
Write contents of RDAC(A0) to Serial
Register Data Byte 0.
Write contents of Serial Register Data
Byte 0 to RDAC(A0).
Increment 6 dB left shift contents of
RDAC(A0), stops at all “Ones.”
Increment all 6 dB left shift contents
of all RDAC Registers, stops at all “Ones.”
Increment contents of RDAC(A0) by
“One,” stops at all “Ones.”
Increment contents of all RDAC Regis-
ters “One,” stops at all “Ones.”
AD5232