1
FN8182.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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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.
X93156
Digitally Controlled Potentiometer
(XDCPTM)
The Intersil X93156 is a three-terminal digitally controlled
potentiometer (XDCP). The device consists of a resistor
array, wiper switches, a control section, and nonvolatile
memory. The wiper position is controlled by an Up/Down
interface.
The potentiometer is implemented by a resistor array
composed of 31 resistive elements and a wiper switching
network. The position of the wiper element is controlled by
the 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.
The device can be used as a three-terminal potentiometer or
as a two terminal variable resistor in a wide variety of
applications including the programming of bias voltages,
LCD brightness and contrast control as well as the
implementation of ladder networks.
Features
Solid-state potentiometer
Up/Down interface
32 wiper tap points
- Wiper position stored in nonvolatile memory and
recalled on power-up
31 resistive elements
- 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, 200A typ.
- Standby current, 2A max.
High reliability
- Endurance 200,000 data changes per bit
- Register data retention, 100 years
R
TOTAL
value = 12.5k
,
50k
Packages
- 8 Ld MSOP, TDFN
- Pb-free plus anneal available (RoHS compliant)
Pinouts
X93156
(8 LD MSOP)
TOP VIEW
X93156
(8 LD TDFN)
TOP VIEW
V
CC
CS
INC
U/D
R
H
V
SS
1
2
3
4
8
7
6
5
X93156
R
L
Rw
V
CC
CS
INC
U/D
R
H
V
SS
X93156
R
L
Rw
**Contact factory for TDFN ordering info.
1
2
3
4
8
7
6
5
Data Sheet
September 16, 2005
2
FN8182.2
September 16, 2005
Block Diagram
Ordering Information
PART NUMBER
PART MARKING
R
TOTAL
(k
)
TEMP RANGE (C)
PACKAGE
PKG. DWG. #
X93156WM8I
12.5
-40 to +85
8 Ld MSOP
M8.118
X93156WM8IZ (See Note)
-40 to +85
8 Ld MSOP (Pb-free)
M8.118
X93156WM8I-2.7*
(AGR)
-40 to +85
8 Ld MSOP
M8.118
X93156WM8IZ-2.7* (See Note)
-40 to +85
8 Ld MSOP (Pb-free)
M8.118
X93156UM8I-2.7*
(AGP)
50
-40 to +85
8 Ld MSOP
M8.118
X93156UM8IZ-2.7* (See Note)
-40 to +85
8 Ld MSOP (Pb-free)
M8.118
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are 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.
*Add "T1" suffix for tape and reel.
5-Bit
Up/Down
Counter
5-Bit
Nonvolatile
Memory
Store and
Recall
Control
Circuitry
One
of
Decoder
Resistor
Array
R
H
U/D
INC
CS
Transfer
Gates
Thirty
V
CC
V
SS
R
L
Control
and
Memory
Up/Down
(U/D)
Increment
(INC)
Device Select
(CS)
V
CC
(Supply Voltage)
V
SS
(Ground)
R
H
General
Detailed
0
1
2
28
29
30
31
Two
R
L
30K
R
W
R
W
Pin Descriptions
MSOP, TDFN SYMBOL
BRIEF DESCRIPTION
1
INC
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.
2
U/D
Up/Down (U/D). The U/D input controls the direction of the wiper movement and whether the counter is incremented
or decremented.
3
R
H
R
H
. The R
H
and R
L
pins of the X93156 are equivalent to the fixed terminals of a mechanical potentiometer. The
minimum voltage is VSS and the maximum is VCC. The terminology of R
H
and R
L
references the relative position of
the terminal in relation to wiper movement direction selected by the U/D input.
4
V
SS
Ground.
5
Rw
R
W
. The Rw pin of the X93156 is the wiper terminal of the potentiometer which is equivalent to the movable terminal
of a mechanical potentiometer.
6
R
L
R
L
. The R
H
and R
L
pins of the X93156 are equivalent to the fixed terminals of a mechanical potentiometer. The
minimum voltage is VSS and the maximum is VCC. The terminology of R
H
and R
L
references the relative position of
the terminal in relation to wiper movement direction selected by the U/D input.
7
CS
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 X93156
will be placed in the low power standby mode until the device is selected once again.
8
V
CC
Supply Voltage.
X93156
3
FN8182.2
September 16, 2005
Absolute Maximum Ratings
Thermal Information
Temperature under bias . . . . . . . . . . . . . . . . . . . . . .-65
C to +135C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C
Voltage on CS, INC, U/D, R
H
, R
L
and V
CC
with respect to V
SS
. . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to +6.5V
Lead temperature (soldering 10s) . . . . . . . . . . . . . . . . . . . . . . 300C
Maximum reflow temperature (40s) . . . . . . . . . . . . . . . . . . . . . 240C
Maximum resistor current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Thermal Resistance (Typical, Note 1)
JA
(C/W)
8 Ld MSOP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
190
Recommended Operating Conditions
Temperature Range
Industrial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C
Supply Voltage
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V (Note 8)
CAUTION: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; the functional
operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
NOTE:
1.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Potentiometer Specifications
Over recommended operating conditions unless otherwise stated.
SYMBOL
PARAMETER
TEST CONDITIONS/NOTES
MIN
TYP
MAX
UNIT
R
TOT
End to end resistance
9.375
12.5
15.625
k
37.5
50
62.5
k
V
R
R
H
, R
L
terminal voltages
0
V
CC
V
Power rating
1
mW
(Note 7)
Noise
Ref: 1kHz
-120
dBV
(Note 7)
R
W
Wiper Resistance
1100
I
W
Wiper Current
(Note 6)
0.6
mA
Resolution
3
%
Absolute linearity (Note 2)
V
H(n)(actual)
-V
H(n)(expected)
1
MI
(Note 4)
Relative linearity (Note 3)
V
H(n+1)
-[V
H(n)+MI
]
0.5
MI
(Note 4)
R
TOTAL
temperature coefficient
(Note 7)
35
ppm/C
C
H
/C
L
/C
W
Potentiometer capacitances
See circuit #2
10/10/25
pF
(Note 7)
NOTES:
2. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (V
H(n)
(actual)-V
H(n)
(expected)) = 1 Ml Maximum. n =
1 .. 29 only
3. Relative linearity is a measure of the error in step size between taps = V
H(n+1)
--[V
H(n)
+ Ml] = 0.5 Ml, n = 1 .. 29 only.
4. 1 Ml = Minimum Increment = R
TOT
/31.
5. Typical values are for T
A
= 25C and nominal supply voltage.
6. This parameter is periodically sampled and not 100% tested
7. This parameter is not 100% tested.
8. When performing multiple write operations, V
CC
must not decrease by more than 150mV from it's initial value.
X93156
4
FN8182.2
September 16, 2005
Test Circuit #1
Circuit #2 SPICE Macro Model
DC Electrical Specifications
Over recommended operating conditions unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
(Note 5)
MAX
UNIT
I
CC1
VCC active current (Increment)
CS = V
IL
, U/D = V
IL
or V
IH
and INC = 0.4V
@ max. t
CYC
V
CC
=3V
50
250
A
CS = V
IL
, U/D = V
IL
or V
IH
and INC = 0.4V
@ max. t
CYC
V
CC
= 5V
200
300
A
I
CC2
VCC active current (Store)
(EEPROM Store)
CS = V
IH
, U/D = V
IL
or V
IH
and INC = V
IH
@
max. t
WR
V
CC
= 3V
600
A
CS = V
IH
, U/D = V
IL
or V
IH
and INC = V
IH
@
max. t
WR
V
CC
= 5V
1400
A
I
SB
Standby supply current
CS = V
CC
- 0.3V, U/D and INC = V
SS
or V
CC
- 0.3V V
CC
= 3V
1
A
CS = V
CC
- 0.3V, U/D and INC = V
SS
or V
CC
- 0.3V V
CC
= 5V
2
A
I
LI
CS input leakage current
V
IN
= V
CC
1
A
I
LI
CS input leakage current
V
CC
= 3V, CS = 0
60
100
150
A
I
LI
CS input leakage current
V
CC
= 5V, CS = 0
120
200
250
A
I
LI
INC, U/D input leakage current
V
IN
= V
SS
to V
CC
1
A
V
IH
CS, INC, U/D input HIGH voltage
V
CC
x 0.7
V
CC
+ 0.5
V
V
IL
CS, INC, U/D input LOW voltage
-0.5
V
CC
x 0.1
V
C
IN
(Notes 7, 8)
CS, INC, U/D input capacitance
V
CC
= 3V, V
IN
= V
SS
, T
A
= 25C, f = 1MHz
10
pF
Endurance and Data Retention
PARAMETER
MIN
UNIT
Minimum endurance
200,000
Data changes per bit
Data retention
100
Years
Test Point
V
H
/R
H
AC Conditions of Test
Input pulse levels
0V to 3V
Input rise and fall times
10ns
Input reference levels
1.5V
C
H
C
L
10pF
10pF
R
H
R
TOTAL
C
W
25pF
R
L
AC Electrical Specifications
Over recommended operating conditions unless otherwise specified.
SYMBOL
PARAMETER
MIN
TYP
MAX
UNIT
t
Cl
CS to INC setup
100
ns
t
lD
INC HIGH to U/D change
100
ns
t
DI
U/D to INC setup
100
ns
t
lL
INC LOW period
1
s
t
lH
INC HIGH period
1
s
t
lC
INC Inactive to CS inactive
1
s
t
CPH
CS Deselect time (NO STORE)
250
ns
X93156
5
FN8182.2
September 16, 2005
A.C. Timing
Power Up and Down Requirements
There are no restrictions on the power-up or power-down
conditions of V
CC
and the voltages applied to the
potentiometer pins provided that V
CC
is always more
positive than or equal to V
H
and V
L
, i.e., V
CC
V
H,
V
L
. The
V
CC
ramp rate spec is always in effect.
Pin Descriptions
R
H
and R
L
The R
H
and R
L
pins of the X93156 are equivalent to the fixed
terminals of a mechanical potentiometer. The minimum
voltage is V
SS
and the maximum is V
CC
. The terminology of
R
H
and R
L
references the relative position of the terminal in
relation to wiper movement direction selected by the U/D
input.
R
w
The Rw pin of the X93156 is the wiper terminal of the
potentiometer which is equivalent to the movable terminal of
a mechanical potentiometer
Up/Down (U/D)
The U/D input controls the direction of the 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
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 X93156 will be placed in
the low power standby mode until the device is selected
once again.
t
CPH
CS Deselect time (STORE)
10
ms
t
CYC
INC cycle time
2
s
t
R
, t
F
(Note 7)
INC input rise and fall time
500
s
t
R
V
CC
(Note 7)
VCC power-up rate
0.2
10,000
V/ms
t
WR
Store cycle
5
10
ms
AC Electrical Specifications
Over recommended operating conditions unless otherwise specified. (Continued)
SYMBOL
PARAMETER
MIN
TYP
MAX
UNIT
CS
INC
U/D
R
W
t
CI
t
IL
t
IH
t
CYC
t
ID
t
DI
t
IW
MI
(Note 4)
t
IC
t
CPHS
t
F
t
R
10%
90%
90%
t
CPHNS
X93156
6
FN8182.2
September 16, 2005
Principles of Operation
There are three sections of the X93156: 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 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, 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 t
IW
(INC to V
W
change). 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. 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 five
bit counter. The output of this counter is decoded to select
one of thirty two 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. In order to avoid an accidental store during power-up,
CS must go HIGH with V
CC
during initial power-up. When
left open, the CS pin is internally pulled up to V
CC
by an
internal 30K resistor.
The system may select the X93156, 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
recalled the previously stored data. In order to recall the
stored position of the wiper on power-up, the CS pin must be
held HIGH.
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, or other system
trim requirements.
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.
Symbol Table
Mode Selection
CS
INC
U/D
MODE
L
H
Wiper Up
L
L
Wiper Down
H
X
Store Wiper Position
H
X
X
Standby Current
L
X
No Store, Return to Standby
L
H
Wiper Up (not recommended)
L
L
Wiper Down (not recommended)
WAVEFORM
INPUTS
OUTPUTS
Must be
steady
Will be
steady
May change
from Low to
High
Will change
from Low to
High
May change
from High to
Low
Will change
from High to
Low
Don't Care:
Changes
Allowed
Changing:
State Not
Known
N/A
Center Line
is High
Impedance
X93156
7
FN8182.2
September 16, 2005
X93156
Mini Small Outline Plastic Packages (MSOP)
NOTES:
1. These package dimensions are within allowable dimensions of
JEDEC MO-187BA.
2. Dimensioning and tolerancing per ANSI Y14.5M-1994.
3. Dimension "D" does not include mold flash, protrusions or gate
burrs and are measured at Datum Plane. Mold flash, protrusion
and gate burrs shall not exceed 0.15mm (0.006 inch) per side.
4. Dimension "E1" does not include interlead flash or protrusions
and are measured at Datum Plane.
Interlead flash and
protrusions shall not exceed 0.15mm (0.006 inch) per side.
5. Formed leads shall be planar with respect to one another within
0.10mm (0.004) at seating Plane.
6. "L" is the length of terminal for soldering to a substrate.
7. "N" is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension "b" does not include dambar protrusion. Allowable
dambar protrusion shall be 0.08mm (0.003 inch) total in excess
of "b" dimension at maximum material condition. Minimum space
between protrusion and adjacent lead is 0.07mm (0.0027 inch).
10. Datums
and
to be determined at Datum plane
.
11. Controlling dimension: MILLIMETER. Converted inch dimen-
sions are for reference only.
L
0.25
(0.010)
L1
R1
R
4X
4X
GAUGE
PLANE
SEATING
PLANE
E
E1
N
1 2
TOP VIEW
INDEX
AREA
-C-
-B-
0.20 (0.008)
A B C
SEATING
PLANE
0.20 (0.008)
C
0.10 (0.004)
C
-A-
-H-
SIDE VIEW
b
e
D
A
A1
A2
-B-
END VIEW
0.20 (0.008)
C D
E
1
CL
C
a
- H -
-A -
- B -
- H -
M8.118 (JEDEC MO-187AA)
8 LEAD MINI SMALL OUTLINE PLASTIC PACKAGE
SYMBOL
INCHES
MILLIMETERS
NOTES
MIN
MAX
MIN
MAX
A
0.037
0.043
0.94
1.10
-
A1
0.002
0.006
0.05
0.15
-
A2
0.030
0.037
0.75
0.95
-
b
0.010
0.014
0.25
0.36
9
c
0.004
0.008
0.09
0.20
-
D
0.116
0.120
2.95
3.05
3
E1
0.116
0.120
2.95
3.05
4
e
0.026 BSC
0.65 BSC
-
E
0.187
0.199
4.75
5.05
-
L
0.016
0.028
0.40
0.70
6
L1
0.037 REF
0.95 REF
-
N
8
8
7
R
0.003
-
0.07
-
-
R1
0.003
-
0.07
-
-
0
5
o
15
o
5
o
15
o
-
0
o
6
o
0
o
6
o
-
Rev. 2 01/03
8
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN8182.2
September 16, 2005
X93156
Thin Dual Flat No-Lead Plastic Package (TDFN)
//
NX (b)
SECTION "C-C"
5
(A1)
BOTTOM VIEW
A
6
AREA
INDEX
C
C
0.10
0.08
SIDE VIEW
0.15
2X
E
A
B
C
0.15
D
TOP VIEW
C B
2X
6
8
AREA
INDEX
NX L
E2
E2/2
REF.
e
N
(Nd-1)Xe
(DATUM A)
(DATUM B)
5
0.10
8
7
D2
B
A
M C
N-1
1
2
PLANE
SEATING
C
A
A3
NX b
D2/2
NX k
FOR EVEN TERMINAL/SIDE
TERMINAL TIP
CL
e
L
C
C
L8.2.5x2
8 LEAD THIN DUAL FLAT NO-LEAD PLASTIC PACKAGE
SYMBOL
MILLIMETERS
NOTES
MIN
NOMINAL
MAX
A
0.70
0.75
0.80
-
A1
-
-
0.05
-
A3
0.20 REF
-
b
0.20
0.25
0.30
5, 8
D
2.00 BSC
-
D2
0.90
1.00
1.10
7, 8
E
2.50 BSC
-
E2
1.20
1.30
1.40
7, 8
e
0.50 BSC
-
k
0.20
-
-
-
L
0.30
0.40
0.50
8
N
8
2
Nd
4
3
Rev. 0 8/05
NOTES:
1. Dimensioning and tolerancing conform to ASME Y14.5-1994.
2. N is the number of terminals.
3. Nd refers to the number of terminals on D.
4. All dimensions are in millimeters. Angles are in degrees.
5. Dimension b applies to the metallized terminal and is measured
between 0.25mm and 0.30mm from the terminal tip.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
7. Dimensions D2 and E2 are for the exposed pads which provide
improved electrical and thermal performance.
8. Nominal dimensions are provided to assist with PCB Land
Pattern Design efforts, see Intersil Technical Brief TB389.
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