X9271_11 Datasheet, PDF (1/22 Pages) Intersil Corporation – Single, Digitally Controlled (XDCP™) Potentiometer

Data Sheet
X9271
Single Supply/Low Power/256-Tap/SPI Bus
June 23, 2011
FN8174.3
Single, Digitally Controlled (XDCP™)
Potentiometer
FEATURES
• 256 Resistor Taps
• SPI Serial Interface for Write, Read, and Transfer
Operations of 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
• Pb-free Plus Anneal Available (RoHS Compliant)
FUNCTIONAL DIAGRAM
DESCRIPTION
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.
V_CC
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
R_H
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 1-888-468-3774 |Copyright Intersil Americas Inc. 2005, 2011. All Rights Reserved
XDCP is a trademark of Intersil Americas Inc. Intersil (and design) is a trademark owned by Intersil Corporation
or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners.