X9241A Datasheet, PDF (5/18 Pages) Xicor Inc. – Quad Digitally Controlled Potentiometer (XDCP)

X9241A
The Increment/Decrement command is different from
the other commands. Once the command is issued and
the X9241A has responded with an acknowledge, the
master can clock the selected wiper up and/or down in
one segment steps; thereby, providing a fine tuning
capability to the host. For each SCL clock pulse (t_HIGH)
while SDA is HIGH, the selected wiper will move one
resistor segment towards the V_H/R_H terminal. Similarly,
for each SCL clock pulse while SDA is LOW, the
selected wiper will move one resistor segment towards
the V_L/R_L terminal. A detailed illustration of the
sequence and timing for this operation are shown in
Figures 5 and 6 respectively.
Figure 3. Two-Byte Instruction Sequence
SCL
SDA
S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 P1 P0 R1 R0 A S
T
C
CT
A
K
KO
R
P
T
Figure 4. Three-Byte Instruction Sequence
SCL
SDA
S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 P1 P0 R1 R0 A CM DW D5 D4 D3 D2 D1 D0 A S
T
C
C
CT
A
K
K
KO
R
P
T
Figure 5. Increment/Decrement Instruction Sequence
SCL
SDA
XX
S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 P1 P0 R1 R0 A I I
T
C
CN _N
A
K
KC _C
R
12
T
ID
NE
CC
n1
DS
ET
CO
nP
REV 1.1.13 12/09/02
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