X9271_14 Datasheet, PDF (1/18 Pages) Intersil Corporation – Single, Digitally Controlled Potentiometer

Data Sheet
X9271
Single Supply/Low Power/256-Tap/SPI Bus
July 18, 2014
FN8174.4
Single, Digitally Controlled (XDCP™)
Potentiometer
The X9271 integrates a single, digitally controlled
potentiometer (XDCP™) on a monolithic CMOS integrated
circuit.
The digitally controlled potentiometer is implemented by
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 four nonvolatile data registers that can
be directly written to and read by the user. The contents of
the WCR control 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
• 256 Resistor Taps
• SPI Serial Interface for Write, Read, and Transfer
Operations of Potentiometer
• Wiper Resistance, 100Ω typical at 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 End-to-End Resistance
• 100-yr Data Retention
• Endurance: 100,000 Data Changes per Bit per Register
• 14-Lead TSSOP
• Low-power CMOS
• Pb-Free Plus Anneal Available (RoHS Compliant)
Functional Diagram
V_CC
SPI
BUS
INTERFACE
ADDRESS
DATA
STATUS
WRITE
READ
TRANSFER
INC/DEC
BUS
INTERFACE
AND CONTROL
CONTROL
POWER-ON RECALL
WIPER COUNTER
REGISTER (WCR)
DATA REGISTERS
16 Bytes
R_H
50kΩ
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 1-888-468-3774 | Copyright Intersil Americas LLC 2005, 2011, 2014. All Rights Reserved
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.