1
X9401
Low Noise/Low Power/SPI Bus
Quad, 64 Tap, Digitally Controlled
Potentiometer (XDCP™)
Description
The X9401 integrates 4 digitally controlled potentiometers
(XDCP) on a monolithic CMOS integrated microcircuit.
The digitally controlled potentiometer is implemented using
64 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. Each
potentiometer has associated with it a volatile Wiper Counter
Register (WCR) and 4 nonvolatile Data Registers
(DR0:DR3) 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 through the switches. Power-up
recalls the contents of 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.
Features
• Quad - 4 Separate Pots, 64 Taps/Pot
• Nonvolatile Storage of Wiper Position
• Four Nonvolatile Data Registers for Each Pot
• 16-bytes of EEPROM Memory
• SPI Serial Interface
•R
TOTAL
= 10k
• Wiper Resistance = 150 Typical
• Standby Current < 3µA (Total Package)
• Operating Current < 700µA max.
•V
CC
= 2.7V to 5V
• 24 Ld SOIC and 24 Ld TSSOP Package
• 100 year Data Retention
• Pb-Free Available (RoHS Compliant)
Block Diagram
INTERFACE
AND
CONTROL
CIRCUITRY
CS
SCK
SO
A0
A1
R0 R1
R2 R3
WIPER
COUNTER
REGISTER
(WCR)
RESISTOR
ARRAY
POT 1
V
H1
/R
H1
V
L1
/R
L1
R0 R1
R2 R3
WIPER
COUNTER
REGISTER
(WCR)
V
H0
/R
H0
V
L0
/R
L0
DATA
8
V
W0
/R
W0
V
W1
/R
W1
R0 R1
R2 R3
RESISTOR
ARRAY
V
H2
/R
H2
V
L2
/R
L2
V
W2
/R
W2
R0 R1
R2 R3
RESISTOR
ARRAY
V
H3
/R
H3
V
L3
/R
L3
V
W3
/R
W3
WIPER
COUNTER
REGISTER
(WCR)
WIPER
COUNTER
REGISTER
(WCR)
POT 3
POT 2
HOLD
POT 0
V
CC
V
SS
WP
SI
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 LLC
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas LLC 2005-2006, 2009, 2015. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Data Sheet FN8190.5September 14, 2015