XDCP Potentiometer. X9279 Datasheet

X9279 Datasheet PDF, Equivalent


Part Number

X9279

Description

Single Digitally-Controlled (XDCP) Potentiometer

Manufacture

Xicor

Total Page 24 Pages
PDF Download
Download X9279 Datasheet PDF


X9279 Datasheet
APPLICATION NOTES AND DEVELOPMENT SYSTEM
AVAILABLE
AN99 • AN115 • AN124 •AN133 • AN134 • AN135
Single Supply / Low Power / 256-tap / 2-Wire Bus
X9279
Single Digitally-Controlled (XDCPTM) Potentiometer
FEATURES
• 256 Resistor Taps
• 2-Wire Serial Interface for write, read, and
transfer operations of the potentiometer
• Wiper Resistance, 100typical @ 5V
• 16 Nonvolatile Data Registers for Each
Potentiometer
• Nonvolatile Storage of Multiple Wiper Positions
• Power On Recall. Loads Saved Wiper Position on
Power Up.
• Standby Current < 5µA Max
• VCC: 2.7V to 5.5V Operation
• 50K, 100Kversions of End to End Resistance
• Endurance: 100,000 Data Changes per Bit per
Register
• 100 yr. Data Retention
• 14-Lead TSSOP, 16-Lead CSP (Chip Scale
Package)
• Low Power CMOS
DESCRIPTION
The X9279 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 2-Wire
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
2-Wire
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
wiper
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 24

X9279 Datasheet
X9279
DETAILED FUNCTIONAL DIAGRAM
VCC
SCL
SDA
A2
A1
A0
WP
INTERFACE
AND
CONTROL
CIRCUITRY
DATA
Bank 0 Power On Recall
DR0 DR1 WIPER
COUNTER
REGISTER
DR2 DR3 (WCR)
50Kand 100K
256-taps
RH
RL
RW
Bank 1 Bank 2
Bank 3
DR0 DR1 DR0 DR1 DR0 DR1
Control
DR2 DR3 DR2 DR3 DR2 DR3
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 24


Features Datasheet pdf 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 / 2-Wir e Bus X9279 Single Digitally-Controlle d (XDCPTM) Potentiometer FEATURES • 2 56 Resistor Taps • 2-Wire Serial Inte rface for write, read, and transfer ope rations of the potentiometer • Wiper Resistance, 100Ω typical @ 5V • 16 Nonvolatile Data Registers for Each Pot entiometer • Nonvolatile Storage of M ultiple Wiper Positions • Power On Re call. Loads Saved Wiper Position on Pow er Up. • Standby Current < 5µA Max VCC: 2.7V to 5.5V Operation • 50K , 100KΩ versions of End to End Resi stance • Endurance: 100,000 Data Chan ges per Bit per Register • 100 yr. Da ta Retention • 14-Lead TSSOP, 16-Lead CSP (Chip Scale Package) • Low Power CMOS DESCRIPTION The X9279 integrates a single digitally controlled potentiom eter (XDCP) on a monolithic CMOS integr ated circuit. The digital controlled potentiometer is implemented using 255 resistive elements in a series.
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