X9279 Datasheet, PDF (1/22 Pages) Xicor Inc. – Single Digitally-Controlled (XDCP) Potentiometer

®
Data Sheet
X9279
Single Supply/Low Power/256-Tap/2-Wire Bus
September 27, 2005
FN8175.2
Single Digitally-Controlled (XDCP™)
Potentiometer
FEATURES
• 256 Resistor Taps
• 2-Wire Serial Interface for Write, Read, and
Transfer Operations of the Potentiometer
• Wiper Resistance, 100Ω Typical @ 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
• V_CC: 2.7V to 5.5V Operation
• 50kΩ, 100kΩ Versions of End to End Resistance
• Endurance: 100,000 Data Changes per Bit per
Register
• 100 yr. Data Retention
• 14 Ld TSSOP
• Low Power CMOS
• Pb-Free Plus Anneal Available (RoHS Compliant)
FUNCTIONAL DIAGRAM
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.
V_CC
R_H
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
wiper
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.
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XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
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