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DATASHEET
X9116
Low Noise, Low Power, Low Cost Digitally Controlled Potentiometer (XDCP™)
FN8160
Rev 3.00
February 3, 2011
The Intersil X9116 is a digitally controlled nonvolatile
potentiometer designed to be used in trimmer applications.
The pot consists of 15 equal resistor segments that connect
to the wiper pin through programmable CMOS switches. The
tap position is programmed through a 3-wire up/down serial
port. The last position of the wiper is stored in a nonvolatile
memory location which is recalled at the time of power up of
the device.
The wiper moves through sequential tap positions with
inputs on the serial port. A falling edge on INC (bar) causes
the tap position to increment one position up or down based
on whether the U/D (bar) pin is held high or low.
The X9116 can be used in many applications requiring a
variable resistance. In many cases it can replace a
mechanical trimmer and offers many advantages such as
temperature and time stability as well as the reliability of a
solid state solution.
Features
• Solid-state nonvolatile
• 16 wiper taps
• 3-wire up/down serial interface
• VCC = 2.7V and 5V
• Active current < 50µA max.
• Standby current < 5µA max.
• RTOTAL = 10k
• Packages: 8 Ld MSOP, 8 Ld SOIC
• Pb-free plus anneal available (RoHS compliant)
Pinout
SOIC/MSOP
INC
U/D
VH/RH
VSS
1
2
X9116
3
4
8
7
6
5
VCC
CS
VL/RL
VW/RW
Block Diagram
VCC (Supply Voltage)
Up/Down
(U/D)
Increment
(INC)
Device Select
(CS)
Control
and
Memory
VSS (Ground)
General
RH/VH
RW/VW
RL/VL
RW-RL Resistance
RH
15
14
13
*
3
2
1
RL 0
10k
9.34k
8.68k
* k
2.08k
1.42k
760
100
FN8160 Rev 3.00
February 3, 2011
Page 1 of 9

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X9116
Ordering Information
PART NUMBER
(BRAND) (Notes 1, 2, 3)
X9116WM8Z
PART MARKING
AKY
VCC LIMITS
(V)
5V ±10%
RTOTAL
(k)
10
TEMP. RANGE
(°C)
PACKAGE
(Pb-free)
0 to +70
8 Ld MSOP
PKG.
DWG. #
M8.118
X9116WM8IZ
DCG
-40 to +85 8 Ld MSOP
M8.118
X9116WS8Z
X9116W Z
0 to +70
8 Ld SOIC
M8.15
X9116WS8IZ
X9116W ZI
-40 to +85 8 Ld SOIC
M8.15
X9116WM8Z-2.7
AOJ
2.7-5.5
0 to +70
8 Ld MSOP
M8.118
X9116WM8IZ-2.7
AKS
-40 to +85 8 Ld MSOP
M8.118
X9116WS8Z-2.7
X9116W ZF
0 to +70
8 Ld SOIC
M8.15
X9116WS8IZ-2.7
X9116W G
-40 to +85 8 Ld SOIC
M8.15
NOTES:
1. Add “T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).
Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC
J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for X9116. For more information on MSL please see techbrief TB363.
Pin Descriptions
VH /RH and VL /RL
The high (VH/RH) and low (VL/RL) terminals of the X9116 are
equivalent to the fixed terminals of a mechanical
potentiometer. The minimum voltage is VSS and the maximum
is VCC.
VW/RW
Rw/Rw is the wiper terminal and is equivalent to the movable
terminal of a mechanical potentiometer. The position of the
wiper within the array is determined by the control inputs. The
wiper terminal series resistance is typically 200to 400
depending upon VCC.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incremented (up) or decremented
(down).
Increment (INC)
The INC input is negative-edge triggered. Toggling INC will
move the wiper and either increment or decrement the counter
in the direction indicated by the logic level on the U/D input.
Chip Select (CS)
The device is selected when the CS input is LOW. The current
counter value is stored in nonvolatile memory when CS is
returned HIGH while the INC input is also HIGH. After the store
operation is complete the X9116 will be placed in the low
power standby mode until the device is selected once again.
Pin Descriptions
SYMBOL
DESCRIPTION
VW/RW
VL/RL
VSS
VCC
U/D
Wiper Terminal
Low Terminal
Ground
Supply Voltage
Up/Down Control Input
INC Increment Control Input
CS Chip Select Input
Pin Descriptions
SYMBOL
DESCRIPTION
VH/RH
High Terminal
FN8160 Rev 3.00
February 3, 2011
Page 2 of 9

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X9116
Principles of Operation
There are three sections of the X9116: the input control,
counter and decode section; the nonvolatile memory; and the
resistor array. The 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. The resistor array is comprised of
15 individual resistors connected in series. At either end of the
array and between each resistor is an electronic switch that
transfers the potential at that point to the wiper pin.
The 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.
The electronic switches on the device operate in a “make
before break” mode when the wiper changes tap positions. If
the wiper is moved several positions, multiple taps are
connected to the wiper for tIW (INC to VW change). The
RTOTAL value for the device can temporarily be reduced 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. When
power is restored, the contents of the memory are recalled and
the wiper is set to the value last stored.
Instructions and Programming
The INC, U/D and CS inputs control the movement of the wiper
along the resistor array. With CS set LOW, the device is
selected and enabled to respond to the U/D and INC inputs.
HIGH to LOW transitions on INC will increment or decrement
(depending on the state of the U/D input) a four bit counter.
The output of this counter is decoded to select one of 16 wiper
positions along the resistive array.
The value of the counter is stored in nonvolatile memory
whenever CS transitions HIGH while the INC input is also
HIGH.
The system may select the X9116, move the wiper, and
deselect the device without having to store the latest wiper
position in nonvolatile memory. After the wiper movement is
performed as described above and once the new position is
reached, the system must keep INC LOW while taking CS
HIGH. The new wiper position will be maintained until changed
by the system or until a power-up/down cycle recalls the
previously stored data.
This procedure allows the system to always power-up to a
preset value stored in nonvolatile memory; then during system
operation, minor adjustments could be made. The adjustments
might be based on user preference, system parameter
changes due to temperature drift, etc.
The state of U/D may be changed while CS remains LOW. This
allows the host system to enable the device and then move the
wiper up and down until the proper trim is attained.
Mode Selection
CS INC U/D
LH
LL
HX
HXX
LX
MODE
Wiper Up
Wiper Down
Store Wiper Position
Standby Current
No Store, Return to Standby
Symbol Table
WAVEFORM
INPUTS
Must be
steady
May change
from Low to
High
May change
from High to
Low
Don’t Care:
Changes
Allowed
N/A
OUTPUTS
Will be
steady
Will change
from Low to
High
Will change
from High to
Low
Changing:
State Not
Known
Center Line
is High
Impedance
FN8160 Rev 3.00
February 3, 2011
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