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X9269 Datasheet, PDF (1/25 Pages) Xicor Inc. – Dual Digitally-Controlled Potentiometers
APPLICATION NOTES AND DEVELOPMENT SYSTEM
AVAILABLE
AN99 • AN115 • AN124 •AN133 • AN134 • AN135
Single Supply / Low Power / 256-tap / 2-Wire bus
X9269
Dual Digitally-Controlled (XDCPTM) Potentiometers
FEATURES
• Dual–Two separate potentiometers
• 256 resistor taps/pot–0.4% resolution
• 2-Wire Serial Interface for write, read, and
transfer operations of the potentiometer single
supply device
• Wiper Resistance, 100Ω typical VCC = 5V
• 4 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
• 50KΩ, 100KΩ versions of End to End Pot
Resistance
• 100 yr. Data Retention
• Endurance: 100,000 Data Changes per Bit per
Register
• 24-Lead SOIC, 16-Lead CSP (Chip Scale Pack-
age), 24-Lead TSSOP
• Low Power CMOS
• Power Supply VCC = 2.7V to 5.5V
DESCRIPTION
The X9269 integrates 2 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. Each 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
RH0
RH1
2-Wire
Bus
Interface
Address
Data
Status
Bus
Interface
and Control
Write
Read
Transfer
Inc/Dec
Control
Power On Recall
Wiper Counter
Registers (WCR)
Data Registers
(DR0–DR3)
VSS
RW0 RL0 RW1 RL1
50KΩ or 100KΩ versions
REV 1.1.11 2/17/03
www.xicor.com
Characteristics subject to change without notice. 1 of 25