X9409_15 Datasheet, PDF (1/19 Pages) Intersil Corporation – Low Noise/Low Power/2-Wire Bus Quad Digita Controlled Potentiometers

DATASHEET
Low Noise/Low Power/2-Wire Bus Quad Digitally
Controlled Potentiometers (XDCP™)
X9409
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.
Features
• Four potentiometers per package
• 64 resistor taps
• 2-wire serial interface for write, read and transfer operations
of the potentiometer
• 50Ω wiper resistance, typical at 5V
• Four nonvolatile data registers for each potentiometer
• Nonvolatile storage of multiple wiper position
• Power-on recall. Loads saved wiper position on power-up
standby current < 1µA typical
• System V_CC: 2.7V operation
• 10kΩ end-to-end resistance
• 100 year data retention
• Endurance: 100,000 data changes per bit per register
• Low power CMOS
• 24 Ld TSSOP
• Pb-free (RoHS compliant)
V_CC
V_SS
WP
SCL
SDA
A0
A1
A2
A3
INTERFACE
AND
CONTROL
CIRCUITRY
8
DATA
POT 0
R₀ R₁
WIPER
COUNTER
REGISTER
R₂ R₃
(WCR)
V_H0/R_HO
V_L0/
R_LO
V_W0/
R_WO
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
R₀ R₁
R₂ R₃
WIPER
COUNTER
REGISTER
(WCR)
RESISTOR
ARRAY
POT 1
V_W1/
R_W1
V_H1/
R_H1
V_L1/R_L1
V_W3/R_W3
R₀ R₁
R₂ R₃
WIPER
COUNTER
REGISTER
(WCR)
RESISTOR
ARRAY
Pot 3
V_H3/R_H3
V_L3/R_L3
FIGURE 1. BLOCK DIAGRAM
September 3, 2015
1
FN8192.6
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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