X9258
®
Low Noise/Low Power/2-Wire Bus/256 Taps
Data Sheet
May 6, 2005
FN8168.1
DESCRIPTION
The X9258 integrates
potentiometers (XDCP) on a monolithic CMOS
integrated circuit.
Quad Digital Controlled Potentiometers
(XDCP™)
4
digitally controlled
FEATURES
• Four potentiometers in one package
• 256 resistor taps/pot–0.4% resolution
• 2-wire serial interface
• Wiper resistance, 40Ω typical @ V+ = 5V, V- = -5V
• Four nonvolatile data registers for each pot
• Nonvolatile storage of wiper position
• Standby current < 5µA max (total package)
• Power supplies
The digitally controlled potentiometer is implemented
using 255 resistive elements in a series array.
Between each element are tap points connected to the
wiper terminal through switches. The position of the
wiper on the array is controlled by the user through the
2-wire bus interface. Each potentiometer has
associated with it a volatile Wiper Counter Register
(WCR) and 4 nonvolatile Data Registers (DR0:DR3)
that can be directly written to and read by the user.
The contents of the WCR controls the position of the
wiper on the resistor array though the switches. Power
up recalls the contents of DR0 to the WCR.
—V
= 2.7V to 5.5V
CC
—V+ = 2.7V to 5.5V
—V- = -2.7V to -5.5V
• 100kΩ, 50kΩ total pot resistance
• High reliability
—Endurance – 100,000 data changes per bit per
register
—Register data retention – 100 years
• 24-lead SOIC, 24-lead TSSOP
• Dual supply version of X9259
The XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
BLOCK DIAGRAM
Pot 0
V
V
CC
SS
R
R
R
R
V
/R
H0 H0
R
R
R
R
0
1
3
0
1
Wiper
Counter
Register
(WCR)
Wiper
Counter
Register
(WCR)
V
/R
H2 H2
Resistor
Array
Pot 2
V+
V-
V
/R
L0 L0
2
WP
2
3
V
/R
L2 L2
V
/R
SCL
SDA
A0
W0 W0
V
/R
W2 W2
Interface
and
Control
A1
8
Circuitry
A2
V
/R
A3
W1 W1
Data
V
V
/R
W3 W3
R
R
R
R
0
1
3
V
/R
H1 H1
R
R
R
R
Wiper
Counter
Register
(WCR)
0
1
/R
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 1
H3 H3
Resistor
Array
Pot 3
2
V
/R
L1 L1
2
3
V
/R
L3 L3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
1-888-INTERSIL or 1-888-352-6832 | 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.
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