X9271_11 Datasheet, PDF (11/22 Pages) Intersil Corporation – Single, Digitally Controlled (XDCP™) Potentiometer

X9271
CS
SCL
SI
0 1 0 1 00
00
ID3 ID2 ID1 ID0 0 0 A1 A0
I3 I2 I1 I0 RA RB ^P1 P0
II
ID
D
NN
NE
E
Device ID
Internal
Address
Instruction
Opcode
Register
Address
Pot/Bank
Address
C
1
C
2
CC
n1
C
n
FIGURE 5. INCREMENT/DECREMENT INSTRUCTION SEQUENCE
SCK
SI
tWRID
VW
VOLTAGE OUT
INC/DEC CMD ISSUED
FIGURE 6. INCREMENT/DECREMENT TIMING LIMITS
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
Read Status (WIP Bit)
TABLE 8. INSTRUCTION SET
INSTRUCTION SET
(1/0 = DATA IS ONE OR ZERO)
I3 I2 I1 I0 RB RA P₁ P₀
OPERATION
1
0
010
0
0 1/0 Read contents of Wiper Counter Register.
1
0
100
0
0 1/0 Write new value to Wiper Counter Register.
1 0 1 1 1/0 1/0 1/0 1/0 Read contents of Data Register pointed to by P1 - P0
and RB - RA.
1 1 0 0 1/0 1/0 1/0 1/0 Write new value to Data Register pointed to by P1 - P0
and RB - RA.
1 1 0 1 1/0 1/0 0
0 Transfer contents of Data Register pointed to by
RB - RA (Bank 0 only) to Wiper Counter Register.
1 1 1 0 1/0 1/0 0
0 Transfer contents of Wiper Counter Register to Register
pointed to by RB-RA (Bank 0 only).
0
0
100
0
0
0 Enable increment/decrement of the Wiper Counter
Register.
0
1
010
0
0
1 Read status of internal write cycle by checking WIP bit.
11
FN8174.3
June 23, 2011