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X93255 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer X93255
Beschreibung Dual Digitally Controlled Potentiometers
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 8 Seiten
X93255 Datasheet, Funktion
®
Data Sheet
March 4, 2005
X93255
FN8187.0
Dual Digitally Controlled Potentiometers
(XDCPs™)
FEATURES
• Dual solid-state potentiometers
• Independent 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 ± 25%
—Terminal voltage, 0 to VCC
• Low power CMOS
—VCC = 5V ± 10%
—Active current, 200µA typ.
—Standby current, 4µA max
• High reliability
—Endurance 200,000 data changes per bit
—Register data retention, 100 years
• RTOTAL value = 50k
• Packages
—14-lead TSSOP
www.DataSheet4U.com
DESCRIPTION
The Intersil X93255 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 two-terminal
variable resistor and can be used in a wide variety of
applications including:
– bias and gain control
– LCD Contrast Adjustment
BLOCK DIAGRAM
VCC (Supply Voltage)
Up/Down
(U/D1)
Increment
(INC1)
Device Select
(CS1)
30k
30k
Control
and
Memory
RH1
RL1
RH2
Up/Down
(U/D2)
Increment
(INC2)
Control
and
Memory
RL2
Device Select
(CS2)
VSS (Ground)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832 | 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.






X93255 Datasheet, Funktion
X93255
PIN DESCRIPTIONS
RH and RL
The RH and RL pins of the X93255 are equivalent to the
end terminals of a variable resistor. The minimum
voltage is VSS and the maximum is VCC. The terminology
of RH and RL references the relative position of the
terminal in relation to wiper movement direction selected
by the U/D input per potentiometer.
Up/Down (U/D)
The U/D input controls the direction of a single
potentiometer’s wiper movement and whether the
counter is incremented or decremented.
Increment (INC)
The INC input is negative-edge triggered. Toggling INC
will move the wiper and either increment or decrement
the pertatining potentiometer’s counter in the direction
indicated by the logic level on the pertaining
potentiometer’s U/D input.
Chip Select (CS)
A potentiometer is selected when the pertaining CS input
is LOW. Its current counter value is stored in nonvolatile
memory when the pertaining CS is returned HIGH while
the pertaining INC input is also HIGH. After the store
operation is complete the affected potentiometer will be
placed in the low power standby mode until the
potentiometer is selected once again.
PRINCIPLES OF OPERATION
There are multiple sections for each potentiometer in the
X93255: an input control, a counter and decode section;
the nonvolatile memory; and a resistor array. Each input
control section operates just like an up/down counter.
The output of this counter is decoded to turn on a single
electronic switch connecting a point on the resistor array
to the wiper output. Under the proper conditions the
contents of the counter can be stored in nonvolatile
memory and retained for future use. Each resistor array
is comprised of 31 individual resistors connected in
series. At either end of the array and between each
resistor is an electronic switch that transfers the
connection at that point to the wiper. The wiper is
connected to the RL terminal, forming a variable resistor
from RH to RL.
Each wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the
last position. That is, the counter does not wrap around
when clocked to either extreme.
If the wiper is moved several positions, multiple taps are
connected to the wiper for up to 10µs. The 2-terminal
resistance value for the device can temporarily change
by a significant amount if the wiper is moved several
positions.
When the device is powered-down, the last wiper
position stored will be maintained in the nonvolatile
memory for each potentiometer. When power is
restored, the contents of the memory are recalled and
each wiper is set to the value last stored.
6 FN8187.0
March 4, 2005

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