X9421 Datasheet, PDF (1/21 Pages) Xicor Inc. – Single Digitally Controlled (XDCP) Potentiometer

®
Data Sheet
X9421
Low Noise/Low Power/SPI Bus
September 23, 2005
FN8196.1
Single Digitally Controlled (XDCP™)
Potentiometer
FEATURES
• Single Voltage Potentiometer
• 64 Resistor Taps
• SPI Serial Interface for Write, Read, and Transfer
Operations of the Potentiometer
• Wiper Resistance, 150Ω Typical at 5V
• 4 Non-Volatile Data Registers
• Non-Volatile 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
• 2.5kΩ, 10kΩ End to End Resistance
• 100 yr. Data Retention
• Endurance: 100, 000 Data Changes per Bit per
Register
• 14 Ld TSSOP, 16 Ld SOIC
• Low Power CMOS
• Pb-Free Plus Anneal Available (RoHS Compliant)
BLOCK DIAGRAM
V_CC
DESCRIPTION
The X9421 integrates a single digitally controlled
potentiometer (XDCP) on a monolithic CMOS
integrated circuit.
The digital controlled potentiometer is implemented
using 63 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 non-
volatile 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.
R_H/V_H
SPI
bus
interface
address
data
status
Bus
Interface &
Control
write
read
transfer
inc / dec
control
Power-on Recall
Wiper Counter
Register (WCR)
Data Registers
4 Bytes
wiper
10kΩ
64-taps
POT
V_SS
R_W/V_{W RL/VL}
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.