Digitally Controlled Potentiometer (XDCP
™
)
FEATURES
•
•
•
•
Solid-state potentiometer
3-wire serial interface
Terminal voltage, 0 to +10V
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 = 10K
Ω
and 50K
Ω
Packages
—8-lead SOIC and DIP
DESCRIPTION
X9319
The Xicor X9319 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
potentiometer for voltage control or as a two-terminal
variable resistor for current control in a wide variety of
applications.
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APPLICATIONS
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LCD bias control
DC bias adjustment
Gain and offset trim
Laser diode bias control
Voltage regulator output control
BLOCK DIAGRAM
U/D
INC
CS
Up/Down
Counter
99
98
97
7-Bit
Nonvolatile
Memory
96
One
of
One
Hundred
Decoder
2
V
SS
(Ground)
General
V
CC
V
SS
Store and
Recall
Control
Circuitry
1
0
R
L
R
W
Detailed
XDCP is a trademark of Xicor, Inc.
R
H
V
CC
(Supply Voltage)
Up/Down
(U/D)
Increment
(INC)
Device Select
(CS)
Control
and
Memory
R
H
R
W
Wiper
Switches
Resistor
Array
R
L
REV 1.7 7/10/03
www.xicor.com
1 of 10
XICOR [ XICOR INC. ]
