I GNS
D ES
EW
T
OR N RODUC 11
F
57
D ED
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53
Data Sheet
T RE IBLE SU 19, ISL9
NO
S
4
POS 6, ISL22
241
ISL2
®
X9420
Low Noise/Low Power/SPI Bus
April 26, 2006
FN8195.1
Single Digitally Controlled (XDCP™)
Potentiometer
FEATURES
• Solid-State Potentiometer
• SPI Serial Interface
• Register Oriented Format
—Direct read/write/transfer wiper positions
—Store as many as four positions per
potentiometer
• Power Supplies
—V
CC
= 2.7V to 5.5V
—V+ = 2.7V to 5.5V
—V– = -2.7V to -5.5V
• Low Power CMOS
—Standby current < 1µA
• High Reliability
—Endurance–100,000 data changes per bit per
register
—Register data retention–100 years
• 8-bytes of Nonvolatile EEPROM Memory
• 10kΩ or 2.5kΩ Resistor Arrays
• Resolution: 64 Taps Each Pot
• 14 Ld TSSOP and 16 Ld SOIC Packages
• Pb-Free Plus Anneal Available (RoHS Compliant)
BLOCK DIAGRAM
HOLD
CS
SCK
S0
SI
A0
DESCRIPTION
The X9420 integrates a single digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
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 SPI bus
interface. The 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.
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.
Interface
and
Control
Circuitry
R0 R1
8
Data
R2 R3
Wiper
Counter
Register
(WCR)
V
H
/R
H
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
|
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.
INTERSIL [ INTERSIL CORPORATION ]
