X9418
®
Low Noise/Low Power/2-Wire Bus
Data Sheet
March 7, 2005
FN8194.0
DESCRIPTION
Dual Digitally Controlled Potentiometers
(XDCP™)
The X9418 integrates two digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
FEATURES
• Two potentiometers in one package
• 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
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
—Register Data Retention–100 years
• 8-bytes of nonvolatile memory
• 2.5kΩ, 10kΩ resistor array
• Resolution: 64 taps each potentiometer
• 24-pin plastic DIP, 24-lead TSSOP and 24-lead
SOIC packages
BLOCK DIAGRAM
V
V
V+
V-
CC
R0 R1
R2 R3
V
/R
H0 H0
SS
Wiper
Counter
Register
(WCR)
V
V
/R
L0 L0
WP
/R
SCL
W0 W0
SDA
A0
A1
Interface
and
Control
8
Circuitry
A2
V
/R
A3
W1 W1
Data
R0 R1
R2 R3
V
/R
Wiper
Counter
Register
(WCR)
H1 H1
Resistor
Array
XDCP1
V
/R
L1 L1
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.