X9259
®
Single Supply/Low Power/256-Tap/2-Wire bus
Data Sheet
September 16, 2005
FN8169.2
Quad Digitally-Controlled (XDCP™)
Potentiometers
Features
• Four Separate Potentiometers in One Package
The X9259 integrates four digitally controlled potentio-
meters (XDCP) on a monolithic CMOS integrated circuit.
• 256 Resistor Taps–0.4% Resolution
• 2-Wire Serial Interface for Write, Read, and
Transfer Operations of the Potentiometer
The digitally controlled potentiometers are imple-mented
with a combination of resistor elements and CMOS switches.
The position of the wipers are controlled by the user through
the 2-wire bus interface. Each potentiometer has associated
with it a volatile Wiper Counter Register (WCR) and four
non-volatile Data Registers that can be directly written to and
read by the user. The content of the WCR controls the
position of the wiper. At power-up, the device recalls the
content of the default Data Registers of each DCP (DR00,
DR10, DR20, and DR30) to the corresponding WCR.
• Wiper Resistance: 100Ω typical @ V
= 5V
CC
• 4 Non-volatile Data Registers for Each Potentiometer
• Non-volatile Storage of Multiple Wiper Positions
• Standby Current < 5µA Max
• V : 2.7V to 5.5V Operation
CC
• 50kΩ, 100kΩ versions of Total Resistance
• Endurance: 100,000 Data Changes per Bit per Register
• 100 yr. Data Retention
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.
• Single Supply Version of X9258
• 24 Ld SOIC, 24 Ld TSSOP
• Low Power CMOS
• Pb-Free Plus Anneal Available (RoHS Compliant)
Functional Diagram
R
R
H3
R
R
H2
V
H1
H0
CC
DCP1
DCP3
DCP2
DCP0
WCR1
DR10
WCR3
DR30
WCR0
DR00
WCR2
DR20
A3
A2
2-Wire
Interface
DR11
DR12
DR13
DR31
DR32
DR33
DR21
DR22
DR23
DR01
DR02
DR03
POWER UP,
INTERFACE
CONTROL
AND
A1
A0
STATUS
SDA
SCL
V
R
R
L3
R
SS
R
R
R
W3
R
WP
R
W0
L1
L2
L0
W1
W2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
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