APPLICATION NOTES AND DEVELOPMENT SYSTEM
A V A I L A B L E
AN99 • AN115 • AN124 •AN133 • AN134 • AN135
Single Supply / Low Power / 256-tap / 2-Wire bus
X9269
Dual Digitally-Controlled (XDCPTM) Potentiometers
FEATURES
DESCRIPTION
• 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.
• Standby Current < 5µA Max
• 50KΩ, 100KΩ versions of End to End Pot
Resistance
• Endurance: 100,000 Data Changes per Bit per
Register
• 100 yr. Data Retention
• 24-Lead SOIC, 24-Lead XBGA
• Low Power CMOS
The X9269 integrates
potentiometer (XDCP) on
integrated circuit.
2
digitally controlled
monolithic CMOS
a
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.
The XDCP can be used as
a three-terminal
• Power Supply V
= 2.7V to 5.5V
potentiometer or as a two terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
CC
FUNCTIONAL DIAGRAM
V
R
R
H1
CC
H0
Write
Read
Address
Data
Status
Transfer
Inc/Dec
Power On Recall
Bus
2-Wire
Wiper Counter
Registers (WCR)
Bus
Interface
and Control
Interface
Data Registers
(DR0–DR3)
Control
V
R
R
R
R
L1
SS
W0
L0
W1
50KΩ or 100KΩ versions
Characteristics subject to change without notice. 1 of 24
REV 1.1.3 4/3/01
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