X9251 Datasheet, PDF (1/25 Pages) Xicor Inc. – Quad Digitally-Controlled (XDCP) Potentiometer

APPLICATION NOTES AND DEVELOPMENT SYSTEM
AVAILABLE
AN99 • AN115 • AN124 •AN133 • AN134 • AN135
Single Supply / Low Power / 256-tap / SPI bus
X9251
Quad Digitally-Controlled (XDCP^TM) Potentiometer
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 yr. data retention
• Single supply version of X9250
• Endurance: 100,000 data changes per bit per
register
• 24-lead SOIC, 24-lead TSSOP, 24-lead CSP
(Chip Scale Package)
• Low power CMOS
DESCRIPTION
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
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
REV 1.3.3 2/10/04
www.xicor.com
Characteristics subject to change without notice. 1 of 25