®
X9409
Low Noise/Low Power/2-Wire Bus
Data Sheet
October 19, 2005
FN8192.3
PRELIMINARY
Quad Digitally Controlled Potentiometers
(XDCP™)
FEATURES
• Four potentiometers per package
• 64 resistor taps
• 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
CC
: 2.7V to 5.5V operation
• 10kΩ, 2.5kΩ End to end resistance
• 100 yr. data retention
• Endurance: 100,000 data changes per bit per
register
• Low power CMOS
• 24 Ld SOIC, 24 Ld TSSOP
• Pb-free plus anneal available (RoHS compliant)
BLOCK DIAGRAM
V
CC
V
SS
R
0
R
1
Pot 0
Wiper
Counter
Register
(WCR)
DESCRIPTION
The X9409 integrates 4 digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
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.
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
H0
/R
HO
R
0
R
1
WP
SCL
SDA
A0
A1
A2
A3
R
2
R
3
V
L0
/
R
LO
V
W0
/
R
WO
R
2
R
3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 2
V
H2
/R
H2
V
L2
/R
L2
V
W2
/R
W2
Interface
and
Control
Circuitry
Data
8
V
W1
/
R
W1
R
0
R
1
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 1
V
H1
/
R
H1
V
L1
/R
L1
R
0
R
1
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 3
V
W3
/R
W3
V
H3
/R
H3
R
2
R
3
R
2
R
3
V
L3
/R
L3
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.
INTERSIL [ INTERSIL CORPORATION ]
