X9409
®
Low Noise/Low Power/2-Wire Bus
Data Sheet
October 19, 2005
FN8192.3
PRELIMINARY
DESCRIPTION
Quad Digitally Controlled Potentiometers
(XDCP™)
The X9409 integrates
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
4
digitally controlled
FEATURES
• Four potentiometers per package
• 64 resistor taps
The digitally 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 2-wire
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.
• 2-wire serial interface for write, read, and trans-
fer operations of the potentiometer
• 50Ω Wiper resistance, typical at 5V.
• Four non-volatile data registers for each
potentiometer
• Non-volatile storage of multiple wiper position
• Power-on recall. Loads saved wiper position on
power-up.
• Standby current < 1µA typical
• System V : 2.7V to 5.5V operation
CC
• 10kΩ, 2.5kΩ End to end resistance
• 100 yr. data retention
The XDCP can be used as
a three-terminal
• Endurance: 100,000 data changes per bit per
register
• Low power CMOS
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
• 24 Ld SOIC, 24 Ld TSSOP
• Pb-free plus anneal available (RoHS compliant)
BLOCK DIAGRAM
Pot 0
V
CC
R
R
R
R
V
/R
H0 HO
R
R
R
R
V
0
2
1
0
2
1
SS
Wiper
Counter
Register
(WCR)
Wiper
Counter
Register
(WCR)
V
/R
H2 H2
Resistor
Array
Pot 2
V
R
/
L0
3
WP
3
LO
V
/R
L2 L2
V
R
/
W0
SCL
SDA
A0
V
/R
W2 W2
WO
Interface
and
Control
A1
8
Circuitry
A2
V
R
/
A3
W1
Data
V
/R
W3 W3
W1
R
R
R
R
0
2
1
R
R
R
R
V
R
/
Wiper
Counter
Register
(WCR)
0
1
H1
V
/R
Wiper
Counter
Register
(WCR)
H3 H3
Resistor
Array
Pot 1
H1
Resistor
Array
Pot 3
3
V
/R
2
3
L1 L1
V
/R
L3 L3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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.