X93256 Datasheet, PDF (1/9 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometers

®
Data Sheet
March 4, 2005
X93256
FN8188.0
Dual Digitally Controlled Potentiometers
(XDCPs™)
FEATURES
• Dual solid-state potentiometers
• Individual Up/Down interfaces
• 32 wiper tap points per potentiometer
—Wiper position stored in nonvolatile memory
and recalled on power-up
• 31 resistive elements per potentiometer
—Temperature compensated
—Maximum resistance tolerance of ± 25%
—Terminal voltage, 0 to V_CC
• Low power CMOS
—V_CC = 2.7 V - 5.5 V.
—Active current, 200µA typical per potentiometer
—Standby current, 4µA max per potentiometer
• High reliability
—Endurance 200,000 data changes per bit
—Register data retention, 100 years
• R_TOTAL value = 12.5kΩ, 50kΩ
• Packages
—14-lead TSSOP
BLOCK DIAGRAM
General Description
V_CC (Supply Voltage)
30K
Up/Down
(U/D₁ & U/D₂)
Increment
(INC₁ & INC₂)
Device Select
(CS₁ & CS₂)
Control
and
Memory
V_SS (Ground)
R_H1
R_W1
R_L1
R_H2
R_W2
R_L2
U/D₁
INC₁
CS₁
V_CC
V_SS
DESCRIPTION
The Intersil X93256 is a dual digitally controlled
potentiometer (XDCP). The device consists of two
resistor arrays, wiper switches, a control section, and
nonvolatile memory. The wiper positions are controlled
by individual Up/Down interfaces.
A potentiometer is implemented by a resistor array
composed of 31 resistive elements and a wiper switching
network. The position of each wiper element is controlled
by a set of independent CS, U/D, and INC inputs. The
position of the wiper can be stored in nonvolatile memory
and then be recalled upon a subsequent power-up
operation.
Each potentiometer is connected as a three-terminal
variable resistor and can be used in a wide variety of
applications including:
– bias and gain control
– LCD Contrast Adjustment
Detailed Single Potentiometer Description
5-Bit
Up/Down
Counter
5-Bit
Nonvolatile
Memory
Store and
Control
Recall
Circuitry
31
30
29
28
One
of
Thirty
Two
Decoder
2
1
0
R_H1
R_W
Transfer
Resistor
Gates
Array
R_L1
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. All Rights Reserved
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