X9279 Datasheet, PDF (8/22 Pages) Xicor Inc. – Single Digitally-Controlled (XDCP) Potentiometer

X9279
Register Selection (R0 to R3) Table
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 1. Identification Byte Format
Register Bank Selection (Bank 0 to Bank 3) Table
Bank
P1 P0 Selection
Operations
00
0
Data Register Read and Write;
Wiper Counter Register
Operations
01
1
Data Register Read and
Write Only
10
2
Data Register Read and
Write Only
11
3
Data Register Read and
Write Only
Device Type
Identifier
ID3 ID2 ID1
0
1
0
(MSB)
Set to 0
Internal Slave
for proper operation
Address
ID0
0
A2
A1
A0
1
(LSB)
Table 2. Instruction Byte Format
Instruction Opcode
I3
I2
I1
I0
(MSB)
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
8
FN8175.2
September 27, 2005