X9251_07 Datasheet, PDF (1/20 Pages) Intersil Corporation – Quad Digitally-Controlled (XDCP™) Potentiometer

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Data Sheet
X9251
Single Supply/Low Power/256-Tap/SPI Bus
April 13, 2007
FN8166.5
Quad Digitally-Controlled (XDCP™)
Potentiometer
The X9251 integrates four digitally controlled potentio-
meters (XDCP) on a monolithic CMOS integrated circuit.
The digitally controlled potentiometers are imple-mented
with a combination of resistor elements and CMOS switches.
The position of the wipers are controlled by the user through
the SPI bus interface. Each potentiometer has associated
with it a volatile Wiper Counter Register (WCR) and four
non-volatile Data Registers that can be directly written to and
read by the user. The content of the WCR controls the
position of the wiper. At power-up, the device recalls the
content of the default Data Registers of each DCP (DR00,
DR10, DR20, and DR30) to the corresponding 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.
Functional Diagram
Features
• Four potentiometers in one package
• 256 resistor taps–0.4% resolution
• SPI Serial Interface for write, read, and transfer operations
of the potentiometer
• Wiper resistance: 100Ω typical @ V_CC = 5V
• 4 Non-volatile data registers for each
potentiometer
• Non-volatile storage of multiple wiper positions
• Standby current <5µA max
• V_CC: 2.7V to 5.5V Operation
• 50kΩ, 100kΩ versions of total resistance
• 100 year data retention
• Single supply version of X9250
• Endurance: 100,000 data changes per bit per register
• 24 Ld SOIC, 24 Ld TSSOP
• Low power CMOS
• Pb-free plus anneal available (RoHS compliant)
V_CC
R_H0
R_H1
R_H2
R_H3
HOLD
A1
A0
SO
SI
SCK
CS
SPI
Interface
POWER UP,
INTERFACE
CONTROL
AND
STATUS
WCR0
DR00
DR01
DR02
DR03
DCP0
WCR1
DR10
DR11
DR12
DR13
DCP1
WCR2
DR20
DR21
DR22
DR23
DCP2
WCR3
DR30
DR31
DR32
DR33
DCP3
V_SS
WP
R_W0 R_L0
R_W1 R_L1
R_W2 R_L2
R_W3 R_L3
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. 2005-2007. All Rights Reserved
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