X9401_06 Datasheet, PDF (1/19 Pages) Intersil Corporation – Quad, 64 Tap, Digitally Controlled Potentiometer

®
Data Sheet
X9401
Low Noise/Low Power/SPI Bus
October 12, 2006
FN8190.3
Quad, 64 Tap, Digitally Controlled
Potentiometer (XDCP™)
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 = 10kΩ
• Wiper resistance = 150Ω typical
• Standby current < 1µA (total package)
• Operating current < 400µA max.
• V_CC = 2.7V to 5V
• Package–24 Ld SOIC
• 100 year data retention
• Pb-free plus anneal available (RoHS compliant)
BLOCK DIAGRAM
DESCRIPTION
The X9401 integrates 4 digitally controlled potentiome-
ters (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 nonvola-
tile Data Registers (DR0:DR3) that can be directly writ-
ten 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 potentiom-
eter or as a two-terminal variable resistor in a wide
variety of applications including control, parameter
adjustments, and signal processing.
V_CC
V_SS
HOLD
CS
SCK
SO
SI
A0
A1
WP
Interface
and
Control
Circuitry
8
Data
Pot 0
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
V_H0/R_H0
V_L0/R_L0
V_W0/R_W0
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 2
V_H2/R_H2
V_L2/R_L2
V_W2/R_W2
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
V_W1/R_W1
Resistor
Array
Pot 1
V_H1/R_H1
V_L1/R_L1
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
V_W3/R_W3
Resistor
Array
Pot 3
V_H3/R_H3
V_L3/R_L3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved
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