X9258_11 Datasheet, PDF (1/20 Pages) Intersil Corporation – Quad Digital Controlled Potentiometers(XDCP™)

Data Sheet
X9258
Low Noise/Low Power/2-Wire Bus/256 Taps
April 14, 2011
FN8168.5
Quad Digital Controlled Potentiometers
(XDCP™)
The X9258 integrates 4 digitally controlled potentiometers
(XDCP™) on a monolithic CMOS integrated circuit.
The digitally controlled potentiometer is implemented using
255 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 non-volatile 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 though 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
• Four potentiometers in one package
• 256 resistor taps/potentiometer................. 0.4% resolution
• 2-wire serial interface
• Wiper resistance, 40Ω typical @ V+ = 5V, V- = -5V
• Four nonvolatile data registers for each potentiometer
• Nonvolatile storage of wiper position
• Standby current <5µA max (total package)
• Power supplies
- V_CC = 2.7V to 5.5V
- V+ = 2.7V to 5.5V
- V- = -2.7V to -5.5V
• 100kΩ, 50kΩ total potentiometer resistance
• High reliability
- Endurance: 100,000 data changes per bit per register
- Register data retention . . . . . . . . . . . . . . . . . . 100 years
• 24 Ld SOIC, 24 Ld TSSOP
• Dual supply version of X9259
• Pb-free available (RoHS compliant)
Block Diagram
V_CC
V_SS
V+
V-
WP
SCL
SDA
A0
A1
A2
A3
INTERFACE
AND
CONTROL
CIRCUITRY
8
DATA
R₀ R₁
WIPER
COUNTER
REGISTER
R₂ R₃
(WCR)
POT 0
V_H0/R_H0
V_L0/R_L0
V_W0/R_W0
R₀ R_{1 WIPER}
COUNTER
REGISTER
R₂ R₃
(WCR)
RESISTOR
ARRAY
POT 2
V_H2/R_H2
V_L2/R_L2
V_W2/R_W2
V_W1/R_W1
V_W3/R_W3
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)
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.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2005, 2006, 2011. All Rights Reserved
XDCP is a trademark of Intersil Americas Inc. Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.