X9279_09 Datasheet, PDF (7/18 Pages) Intersil Corporation – Single Digitally-Controlled (XDCP™) Potentiometer

X9279
TABLE 1. REGISTER SELECTION (R0 TO R3)
REGISTER
RB RA SELECTION
OPERATIONS
00
0
Data Register Read and Write; Wiper
Counter Register Operations
01
1
Data Register Read and Write; Wiper
Counter Register Operations
10
2
Data Register Read and Write; Wiper
Counter Register
Operations
11
3
Data Register Read and Write; Wiper
Counter Register
Operations
TABLE 2. REGISTER BANK SELECTION (BANK 0 TO BANK 3)
BANK
P1 P0 SELECTION
OPERATIONS
0
0
0
Data Register Read and Write; Wiper
Counter Register Operations
0
1
1
Data Register Read and Write Only
1
0
2
Data Register Read and Write Only
1
1
3
Data Register Read and Write Only
TABLE 3. IDENTIFICATION BYTE FORMAT
Device Type
Identifier
Set to 0
Internal Slave
for proper operation
Address
ID3
ID2
ID1
ID0
0
A2
A1
A0
0
1
0
1
(MSB)
(LSB)
TABLE 4. INSTRUCTION BYTE FORMAT
Instruction Opcode
I3
I2
I1
(MSB)
INSTRUCTION
Read Wiper Counter Register
Write Wiper Counter
Register
Read Data Register
Write Data Register
XFR Data Register to
Wiper Counter Register
XFR Wiper Counter
Register to Data Register
Increment/Decrement
Wiper Counter Register
NOTE:
3. 1/0 = data is one or zero
I0
I3 I2
10
10
10
11
11
11
00
Register
Selection
P1 and P0 are used also for register Bank Selection
for 2-Wire Register Write and Read operations
Register Selection
RB
RA
P1
P0
Register Selected RB RA
DR0
0
0
(LSB)
DR1
0
1
DR2
1
0
Pot Selection (Bank Selection)
DR3
Set to P0 = 0 for potentiometer operations
1
1
TABLE 5. INSTRUCTION SET
INSTRUCTION Set
I1 I0 RB RA P₁ P₀
OPERATION
0 1 0 0 0 0 Read the contents of the Wiper Counter Register
1 0 0 0 0 0 Write new value to the Wiper Counter Register
1 1 1/0 1/0 1/0 1/0 Read the contents of the Data Register pointed to by P1 - P0
and RB - RA
0 0 1/0 1/0 1/0 1/0 Write new value to the Data Register pointed to by P1 - P0 and
RB - RA
0 1 1/0 1/0 0
0 Transfer the contents of the Data Register pointed to by
RB-RA (Bank 0 only) to the Wiper Counter Register
1 0 1/0 1/0 0
0 Transfer the contents of the Wiper Counter Register to the
Register pointed to by RB-RA (Bank 0 only)
1 0 0 0 0 0 Enable Increment/decrement of the Wiper Counter Register
7
FN8175.4
September 23, 2009