X9428
®
Low Noise/Low Power/2-Wire Bus
Data Sheet
March 8, 2005
FN8197.0
DESCRIPTION
The X9428 integrates
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
Single Digitally Controlled Potentiometer
(XDCP™)
a
digitally controlled
FEATURES
• Solid state potentiometer
• 2-wire serial interface
• Register oriented format
—Direct Read/Write/Transfer Wiper Position
—Store as many as Four Positions per
Potentiometer
The digitally controlled potentiometer is implemented
using 63 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 through the switches. Power-up recalls
the contents of DR0 to the WCR.
• Power supplies
—V
= 2.7V to 5.5V
CC
—V+ = 2.7V to 5.5V
—V– = -2.7V to -5.5V
• Low power CMOS
—Standby current < 1µA
—Ideal for Battery Operated Applications
• High reliability
The XDCP can be used as
a three-terminal
—Endurance–100,000 Data Changes per Bit per
Register
—Register Data Retention–100 years
• 4-bytes of nonvolatile memory
• 10kΩ resistor array
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
• Resolution: 64 taps each potentiometer
• SOIC and TSSOP packages
BLOCK DIAGRAM
V
V
CC
SS
V+
V–
R0 R1
R2 R3
V /R
H
H
SCL
Wiper
Counter
Register
(WCR)
Interface
and
Control
SDA
A0
V /R
8
L
L
A2
A3
Circuitry
V
/R
W
Data
W
WP
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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