X9271 Potentiometer Datasheet

X9271 Datasheet, PDF, Equivalent


Part Number

X9271

Description

Single Digitally-Controlled (XDCP) Potentiometer

Manufacture

Xicor

Total Page 23 Pages
Datasheet
Download X9271 Datasheet


X9271
APPLICATION NOTES AND DEVELOPMENT SYSTEM
AVAILABLE
AN99 • AN115 • AN124 •AN133 • AN134 • AN135
Single Supply / Low Power / 256-tap / SPI bus
X9271
Single Digitally-Controlled (XDCPTM) Potentiometer
FEATURES
• 256 Resistor Taps
• SPI Serial Interface for write, read, and transfer
operations of the potentiometer
• Wiper Resistance, 100typical @ VCC = 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
• VCC: 2.7V to 5.5V Operation
• 50K, 100Kversions of End to End Resistance
• 100 yr. Data Retention
• Endurance: 100,000 Data Changes per Bit per
Register
• 14-Lead TSSOP, 16-Lead CSP (Chip Scale
Package)
• Low Power CMOS
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.
FUNCTIONAL DIAGRAM
VCC
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
RH
50Kand 100K
256-taps
POT
VSS
RW RL
REV 1.1.7 2/6/03
www.xicor.com
Characteristics subject to change without notice. 1 of 23

X9271
X9271
DETAILED FUNCTIONAL DIAGRAM
VCC
HOLD
CS
SCK
SO
SI
A0
A1
WP
INTERFACE
AND
CONTROL
CIRCUITRY
DATA
Bank 0 Power On Recall
R0 R1 WIPER
COUNTER
REGISTER
R2 R3 (WCR)
50Kand 100K
256-taps
Bank 1 Bank 2
R0 R1 R0 R1
Bank 3
R0 R1
RH
RL
RW
Control
R2 R3 R2 R3 R2 R3
12 additional nonvolatile registers
3 Banks of 4 registers x 8-bits
VSS
CIRCUIT LEVEL APPLICATIONS
• Vary the gain of a voltage amplifier
• Provide programmable dc reference voltages for
comparators and detectors
• Control the volume in audio circuits
• Trim out the offset voltage error in a voltage amplifier
circuit
• Set the output voltage of a voltage regulator
• Trim the resistance in Wheatstone bridge circuits
• Control the gain, characteristic frequency and
Q-factor in filter circuits
• Set the scale factor and zero point in sensor signal
conditioning circuits
• Vary the frequency and duty cycle of timer ICs
• Vary the dc biasing of a pin diode attenuator in RF
circuits
• Provide a control variable (I, V, or R) in feedback
circuits
SYSTEM LEVEL APPLICATIONS
• Adjust the contrast in LCD displays
• Control the power level of LED transmitters in
communication systems
• Set and regulate the DC biasing point in an RF
power amplifier in wireless systems
• Control the gain in audio and home entertainment
systems
• Provide the variable DC bias for tuners in RF
wireless systems
• Set the operating points in temperature control
systems
• Control the operating point for sensors in industrial
systems
• Trim offset and gain errors in artificial intelligent
systems
REV 1.1.7 2/6/03
www.xicor.com
Characteristics subject to change without notice. 2 of 23


Features APPLICATION NOTES AND DEVELOPMENT SYSTEM A V A I L A B L E AN99 • AN115 • A N124 •AN133 • AN134 • AN135 Sing le Supply / Low Power / 256-tap / SPI b us X9271 Single Digitally-Controlled ( XDCPTM) Potentiometer FEATURES • 256 Resistor Taps • SPI Serial Interface for write, read, and transfer operation s of the potentiometer • Wiper Resist ance, 100Ω typical @ VCC = 5V • 16 Nonvolatile Data Registers • Nonvolat ile Storage of Multiple Wiper Positions • Power On Recall. Loads Saved Wiper Position on Power Up. • Standby Curr ent < 3µA Max • VCC: 2.7V to 5.5V Op eration • 50KΩ, 100KΩ versions of End to End Resistance • 100 yr. Data Retention • Endurance: 100,000 Data Changes per Bit per Register • 14-Lea d TSSOP, 16-Lead CSP (Chip Scale Packag e) • Low Power CMOS DESCRIPTION The X 9271 integrates a single digitally cont rolled potentiometer (XDCP) on a monoli thic CMOS integrated circuit. The digit al controlled potentiometer is implemented using 255 resistive elements in a series array. Between each el.
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