1
®
FN8184.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X9318
Digitally Controlled Potentiometer
(XDCP™)
FEATURES
• Solid-state potentiometer
• 3-wire serial interface
• Terminal voltage, 0 to +8V
• 100 wiper tap points
—Wiper position stored in nonvolatile memory
and recalled on power-up
• 99 resistive elements
—Temperature compensated
—End to end resistance range ± 20%
• Low power CMOS
—V
CC
= 5V
—Active current, 3mA max.
—Standby current, 1mA max.
• High reliability
—Endurance, 100,000 data changes per bit
—Register data retention, 100 years
•R
TOTAL
value = 10kΩ
• Packages
—8 Ld SOIC and DIP
• Pb-free plus anneal available (RoHS compliant)
APPLICATIONS
• LCD bias control
• DC bias adjustment
• Gain and offset trim
• Laser diode bias control
• Voltage regulator output control
DESCRIPTION
The Intersil X9318 is a digitally controlled potentiometer
(XDCP). The device consists of a resistor array, wiper
switches, a control section, and nonvolatile memory.
The wiper position is controlled by a 3-wire interface.
The potentiometer is implemented by a resistor array
composed of 99 resistive elements and a wiper switch-
ing network. Between each element and at either end
are tap points accessible to the wiper terminal. The
position of the wiper element is controlled by the CS
,
U/D
, and INC inputs. The position of the wiper can be
stored in nonvolatile memory and then be recalled
upon a subsequent power-up operation.
The device can be used as a three-terminal potentiome-
ter for voltage control or as a two-terminal variable resis-
tor for current control in a wide variety of applications.
PIN CONFIGURATION
BLOCK DIAGRAM
R
H
V
CC
INC
U/D
1
2
3
4
8
7
6
5
X9318
DIP/SOIC
V
SS
CS
R
L
R
W
Up/Down
Counter
7-Bit
Nonvolatile
Memory
Store and
Recall
Control
Circuitry
One
of
One
Decoder
Resistor
Array
R
H
U/D
INC
CS
Wiper
Switches
Hundred
V
CC
V
SS
R
L
R
W
Control
and
Memory
Up/Down
(U/D
)
Increment
(INC
)
Device Select
(CS
)
V
CC
(Supply Voltage)
V
SS
(Ground)
R
H
R
W
R
L
General
Detailed
0
1
2
96
97
98
99
Data Sheet September 14, 2005
