X9271 Datasheet, PDF (1/22 Pages) Xicor Inc. – Single Digitally-Controlled (XDCP) Potentiometer

®
Data Sheet
X9271
Single Supply/Low Power/256-Tap/SPI Bus
March 31, 2005
FN8174.1
Single Digitally-Controlled (XDCP™)
Potentiometer
FEATURES
• 256 Resistor Taps
• SPI Serial Interface for write, read, and transfer
operations of the potentiometer
• Wiper Resistance, 100Ω typical @ V_CC = 5V
• 16 Nonvolatile Data Registers
• Nonvolatile 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
• 50kΩ, 100kΩ versions of End to End Resistance
• 100 yr. Data Retention
• Endurance: 100,000 Data Changes per Bit per
Register
• 14-Lead TSSOP
• Low Power CMOS
FUNCTIONAL DIAGRAM
V_CC
DESCRIPTION
The X9271 integrates a single digitally controlled
potentiometer (XDCP) on a monolithic CMOS
integrated circuit.
The digital controlled potentiometer is implemented
using 255 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 a four
nonvolatile 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. Powerup 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.
R_H
SPI
Bus
Interface
Address
Data
Status
Bus
Interface
and Control
Write
Read
Transfer
Inc/Dec
Control
Power-on Recall
Wiper Counter
Register (WCR)
Data Registers
16 Bytes
50kΩ and 100kΩ
256-taps
POT
V_SS
R_W
R_L
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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.