®
X9429
Low Noise/Low Power/2-Wire Bus
Data Sheet
October 13, 2008
FN8248.3
Single Digitally Controlled Potentiometer
(XDCP™)
The X9429 integrates a single digitally controlled
potentiometer (XDCP) on a monolithic CMOS integrated
circuit.
The digital 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. The
potentiometer has associated with it a volatile Wiper Counter
Register (WCR) and a four non-volatile 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. Power-up recalls the contents of
the default data register (DR0) to the WCR.
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.
Features
• Single Voltage Potentiometer
• 64 Resistor Taps
• 2-wire Serial Interface for Write, Read, and Transfer
Operations of the Potentiometer
• Wiper Resistance, 150W Typical at 5V
• Non-Volatile Storage of Multiple Wiper Positions
• Power-on Recall. Loads Saved Wiper Position on Power-up.
• Standby Current < 3µA Max
• V
CC
: 2.7V to 5.5V Operation
• 2.5kW, 10kW Total Pot Resistance
• Endurance: 100,000 Data Changes per Bit per Register
• 100 yr. Data Retention
• 14 Ld TSSOP, 16 Ld SOIC
• Low Power CMOS
• Pb-free available (RoHS compliant)
Block Diagram
V
CC
V
H
/R
H
ADDRESS
DATA
STATUS
2-WIRE
BUS
INTERFACE
WRITE
READ
TRANSFER
INC/DEC
BUS
INTERFACE
AND
CONTROL
CONTROL
POWER-ON RECALL
WIPER COUNTER
REGISTER (WCR)
DATA REGISTERS
4 BYTES
WIPER
10kΩ
64-TAPS
POT
V
SS
V
L
/R
L
V
W
/R
W
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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