x9438 Intersil Corporation, x9438 Datasheet - Page 5

• Manufacturer Part Number: x9438
• Description: Dual Digitally Controlled Potentiometer Xdcp With Operational Amplifier
• Manufacturer: Intersil Corporation

Figure 3. Two-Byte Command Sequence
Figure 4. Three-Byte Command Sequence
The Increment/Decrement command is different from
the other commands. Once the command is issued
and the X9438 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
Figure 5. Increment/Decrement Command Sequence
SCL
SDA
SCL
SDA
S
T
A
R
T
S
T
A
R
T
0
SCL
SDA
0
1
1
0
S
T
A
R
T
0
1
0
1
A3 A2 A1 A0 A
5
A3 A2 A1 A0
1
0
1
A3 A2 A1 A0
C
K
I3
A
C
K
I3
I2
I2
I1 I0
X9438
I1
A
C
K
0
I0
I3
P0 R1 R0 A
(t
move one resistor segment towards the V
Similarly, for each SCL clock pulse while SDA is LOW,
the selected wiper will move one resistor segment
towards the V
sequence for this operation is shown in Figure 5.
P1 P0 R1 R0 A
I2
HIGH
) while SDA is HIGH, the selected wiper will
I1
X
I0
C
K
X
R1 R0 0
L
C
K
terminal. A detailed illustration of the
N
C
1
I
D5 D4 D3 D2 D1 D0
N
C
2
I
P0
A
C
K
N
C
n
I
S
T
O
P
D
E
C
1
H
D
E
C
n
A
C
K
March 11, 2005
terminal.
O
S
T
O
P
S
T
P
FN8199.0