X9268
®
Dual Supply/Low Power/256-Tap/2-Wire Bus
Data Sheet
August 29, 2006
FN8172.4
DESCRIPTION
Dual Digitally-Controlled (XDCP™)
Potentiometers
The X9268 integrates
potentiometer (XDCP) on
integrated circuit.
2
digitally controlled
monolithic CMOS
a
FEATURES
• Dual–Two Separate Potentiometers
• 256 Resistor Taps/Pot–0.4% Resolution
• 2-Wire Serial Interface for Write, Read, and
Transfer Operations of the Potentiometer
• Wiper Resistance, 100Ω typical @ V+ = 5V,
V- = -5V
• 16 Nonvolatile Data Registers for Each
Potentiometer
• Nonvolatile Storage of Multiple Wiper Positions
• Power-on Recall. Loads Saved Wiper Position
on Power-up.
The digital 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 a four nonvolatile Data Registers 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. Powerup
recalls the contents of the default Data Register (DR0)
to the WCR.
• Standby Current <5µA Max
• V : ±2.7V to ±5.5V Operation
CC
• 50kΩ, 100kΩ Versions of End to End Pot
Resistance
The XDCP can be used as
a three-terminal
• Endurance: 100,000 Data Changes per Bit per
Register
• 100 yr. Data Retention
• 24 Ld SOIC
potentiometer or as a two terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
• Low Power CMOS
• Power Supply V
= ±2.7V to ±5.5V
CC
V+ = 2.7V to 5.5V
V- = -2.7V to -5.5V
• Pb-Free Plus Anneal Available (RoHS Compliant)
FUNCTIONAL DIAGRAM
V
R
R
H1
V
CC
H0
+
Write
Read
Address
Data
Status
Transfer
Inc/Dec
Power-on Recall
Bus
2-Wire
Bus
Interface
Wiper Counter
Registers (WCR)
Interface
and Control
Data Registers
(DR0–DR3)
Control
V
R
R
R
R
V-
SS
W0
L0
W1
L1
50kΩ
or 100kΩ versions
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, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1