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X9421 fiches techniques PDF

Xicor - Single Digitally Controlled (XDCP) Potentiometer

Numéro de référence X9421
Description Single Digitally Controlled (XDCP) Potentiometer
Fabricant Xicor 
Logo Xicor 





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X9421 fiche technique
APPLICATION NOTES
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/SPI Bus
X9421
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, 150Typical 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
• VCC : 2.7V to 5.5V Operation
2.5K, 10KEnd to End Resistance
• 100 yr. Data Retention
• Endurance: 100, 000 Data Changes per Bit per
Register
• 14-Lead TSSOP, 16-Lead SOIC
• Low Power CMOS
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.
BLOCK DIAGRAM
VCC
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
RH/VH
wiper
10K
64-taps
POT
VSS
RW/VW RL/VL
REV 1.1.6 8/1/02
www.xicor.com
Characteristics subject to change without notice. 1 of 21

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