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July 18, 2014
TERSIL
1-888-IN
Digitally Controlled Potentiometer
(XDCP™)
The Intersil X93154 is a 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 a 3-wire 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
during a subsequent power-up operation.
The device 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
X93154
Low Power, 32 Taps
FN8180.4
Features
• Solid-State Potentiometer
• 3-Wire Serial 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 ±30%
- Terminal Voltage, 0 to VCC
• Low Power CMOS
- VCC = 3V ±10%
- Active Current, 250µA max.
- Standby Current, 1µA max.
• High Reliability
- Endurance 200,000 Data Changes per Bit
- Register Data Retention, 100 years
Pinout
X93154
(8 LD MSOP)
TOP VIEW
• RTOTAL Value = 50kΩ
• Package
- 8 Ld MSOP
INC
1
8
VCC
U/D
2
7
CS
RH
3
6
RL
VSS
4
5
NC*
• Pb-free (RoHS Compliant)
*NC can be left unconnected, or connected to any voltage between VSS
and VCC
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2004, 2005, 2008, 2014. All Rights Reserved
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
X93154
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART MARKING
X93154UM8IZ-3
VCC LIMITS (V)
RTOTAL (kΩ)
TEMP RANGE (°C)
3 ±10%
50
-40 to +85
AIW
PACKAGE
(Pb-free)
8 Ld MSOP
PKG.
DWG. #
M8.118
NOTES:
1. Add "T1" 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 product information page for X93154. For more information on MSL, please see tech brief
TB363.
Block Diagram
VCC (SUPPLY VOLTAGE)
U/D
INC
CS
30k
5-BIT
UP/DOWN
COUNTER
(U/D)
5-BIT
NONVOLATILE
MEMORY
CONTROL
AND
MEMORY
INCREMENT
(INC)
30
29
RH
UP/DOWN
RH
31
DEVICE SELECT
28
ONE
OF
THIRTY-TWO
DECODERS
STORE AND
CONTROL
RECALL
CIRCUITRY
(CS)
RL
TRANSFER
GATES
RESISTOR
ARRAY
2
1
VCC
0
VSS (Ground)
VSS
RL
GENERAL
DETAILED
Pin Descriptions
MSOP
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
RH
RH. The RH and RL pins of the X93154 are equivalent to the fixed terminals of a mechanical potentiometer. 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.
4
VSS
Ground.
5
NC
No Connection (or can be connected to any voltage between VSS and VCC).
6
RL
RL. The RH and RL pins of the X93154 are equivalent to the fixed terminals of a mechanical potentiometer. 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.
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 X93154 will be placed in the low power standby mode until the device is selected once again.
8
VCC
Supply Voltage.
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FN8180.4
July 18, 2014
X93154
Absolute Maximum Ratings
Thermal Information
Voltage on CS, INC, U/D, RH, RL and VCC
with Respect to VSS . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to +6.5V
Maximum Resistor Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Temperature Under Bias . . . . . . . . . . . . . . . . . . . . .-65C to +135C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Temperature Range, Industrial. . . . . . . . . . . . . . . . . .-40°C to +85°C
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . .3V ±10% (Note 4)
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
4. When performing multiple write operations, VCC must not decrease by more than 150mV from its initial value.
Potentiometer Specifications
MIN
(Note 10)
TYP
(Note 8)
MAX
(Note 10)
UNIT
End-to-End Resistance
35
50
65
kΩ
RH, RL Terminal Voltages
0
VCC
V
1
mW
(Note 9)
SYMBOL
RTOT
VR
Across recommended operating conditions unless otherwise stated.
PARAMETER
TEST CONDITIONS/NOTES
Power Rating
RTOTAL 50kΩ
Noise
Ref: 1kHz
RW
Wiper Resistance
(Note 9)
1000
Ω
IW
Wiper Current
(Note 9)
0.6
mA
-120
Resolution
CH/CL/CW
dBV
(Note 9)
3
Absolute Linearity (Note 5)
VH(n)(actual)-VH(n)(expected)
Relative Linearity (Note 6)
VH(n+1)-[VH(n)+MI]
RTOTAL Temperature Coefficient
(Note 9)
Potentiometer Capacitances
See “Circuit #2 SPICE Macro
Model” on page 4
%
±1
MI
(Note 7)
±0.5
MI
(Note 7)
±35
ppm/°C
10/10/25
pF
(Note 9)
DC Electrical Specifications Across recommended operating conditions, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 10)
TYP
(Note 8)
MAX
(Note 10)
UNIT
50
250
µA
600
µA
ICC1
VCC Active Current (Increment)
CS = VIL, U/D = VIL or VIH and INC = 0.4V at
max. tCYC
ICC2
VCC Active Current (Store)
(EEPROM Store)
CS = VIH, U/D = VIL or VIH and INC = VIH at
max. tWR
ISB
Standby Supply Current
CS = VCC - 0.3V, U/D and INC = VSS or
VCC - 0.3V
1
µA
ILI
CS
VIN = VCC
±1
µA
ILI
CS
VCC = 3V, CS = 0
150
µA
ILI
INC, U/D Input Leakage Current
VIN = VSS to VCC
±1
µA
VIH
CS, INC, U/D Input HIGH Voltage
VCC x 0.7
VCC + 0.5
V
VIL
CS, INC, U/D Input LOW Voltage
-0.5
VCC x 0.1
V
CIN
(Note 9)
CS, INC, U/D Input Capacitance
10
pF
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VCC = 3V, VIN = VSS, TA = +25°C, f = 1MHz
60
100
FN8180.4
July 18, 2014
X93154
Circuit #2 SPICE Macro Model
Endurance and Data Retention
PARAMETER
MIN
UNIT
Minimum endurance
200,000
Data changes per bit
Data retention
100
RTOTAL
RH
Years
CL
CW
CH
RL
10pF
Test Circuit #1
25pF
10pF
TEST POINT
VH/RH
AC Conditions of Test
Input pulse levels
0V to 3V
Input rise and fall times
10ns
Input reference levels
1.5V
AC Electrical Specifications Across recommended operating conditions unless otherwise specified.
SYMBOL
PARAMETER
MIN
(Note 10)
TYP
(Note 8)
MAX
(Note 10)
UNIT
tCl
CS to INC Setup
100
ns
tlD
INC HIGH to U/D Change
100
ns
tDI
U/D to INC Setup
100
ns
tlL
INC LOW Period
1
µs
tlH
INC HIGH Period
1
µs
tlC
INC Inactive to CS Inactive
1
µs
tCPH
CS Deselect Time (No Store)
250
ns
tCPH
CS Deselect Time (Store)
10
ms
tCYC
INC Cycle Time
2
µs
tR , tF
(Note 9)
INC Input Rise and Fall Time
tR VCC
(Note 9)
VCC Power-up Rate
tWR
Store Cycle
1.0
5
500
µs
50
V/ms
10
ms
NOTES:
5. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (VH(n)(actual)-VH(n)(expected)) = ±1 Ml Maximum.
n = 1... 29 only.
6. Relative linearity is a measure of the error in step size between taps = VH(n+1)-[VH(n) + Ml] = ±0.5 Ml, n = 1 .. 29 only.
7. 1 Ml = Minimum Increment = RTOT/31.
8. Typical values are for TA = +25°C and nominal supply voltage.
9. Limits established by characterization and are not production tested.
10. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
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X93154
AC Timing
CS
tCYC
tCI
tIL
tIH
tIC
(STORE)
tCPH
90%
INC
90%
10%
tID
tDI
tF
tR
U/D
Power-Up and Power-Down Requirements
There are no restrictions on the power-up or power-down
conditions of VCC and the voltages applied to the
potentiometer pins provided that VCC is always more positive
than or equal to VH and VL, i.e., VCC  VH,VL. The VCC ramp
rate specification is always in effect.
Pin Descriptions
RH and RL
The RH and RL pins of the X93154 are equivalent to the fixed
terminals of a mechanical potentiometer. 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.
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 X93154 will be placed in the low
power standby mode until the device is selected once again.
Pin Names
SYMBOL
DESCRIPTION
RH
High terminal
RL
Low terminal
VSS
Ground
VCC
Supply voltage
U/D
Up/Down control input
INC
Increment control input
CS
Chip Select control input
Principles of Operation
There are three sections of the X93154: 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 tIW (INC to VW 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.
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FN8180.4
July 18, 2014
X93154
Instructions and Programming
Mode Selection
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 5-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 VCC during initial power-up. When
performing multiple write operations, VCC must not decrease
by more than 150mV from its initial value. When left open, the
CS pin is internally pulled up to VCC by an internal 30k resistor.
CS
INC
U/D
L
H
MODE
L
Wiper Down
H
X
Store Wiper Position
X
X
Standby Current
L
X
No Store, Return to Standby
L
H
Wiper Up (not recommended)
L
L
Wiper Down (not recommended)
Symbol Table
INPUTS
OUTPUTS
The system may select the X93154, 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 previously described 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.
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
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.
N/A
Center Line
is High
Impedance
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.
WAVEFORM
Applications Information
Electronic digitally controlled (XDCP) potentiometers provide
three powerful application advantages:
1. The variability and reliability of a solid-state potentiometer
2. The flexibility of computer-based digital controls
Mode Selection
CS
L
INC
U/D
H
3. The retentivity of nonvolatile memory used for the storage
of multiple potentiometer settings or data
MODE
Wiper Up
.
I
VR
FIGURE 1. TWO TERMINAL VARIABLE RESISTOR. VARIABLE CURRENT
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FN8180.4
July 18, 2014
X93154
Low Voltage High Impedance Instrumentation Amplifier
3.3V
10k
+
+
10k
50k
U1A
50k
VIN
VOUT
U1C
X93154 (RTOTAL)
+
50k
-
Gain =
10k
U1B
10k
U1 = LT1467
+
-
50k
50k )
( 1+
10k
RTOTAL
50k
Micro-Power LCD Contrast Control
3.3V
300k
240k
3.3V
+
100k
VOUT = -3.88 (1 +
100k
U1A
-
-
VOUT = -2.75V TO -11.6V
U1B
U1 = LMC6042
+
50k
100k
100k
)
50k + RTOTAL
-12V
X93154 (RTOTAL)
Single Supply Variable Gain Amplifier
3.3V
3.3V
20k
+
20k
VOUT
U1
-
Gain =
RTOTAL
10k
U1 = LMC6042
VIN
10k
X93154
(RTOTAL)
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
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
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FN8180.4
July 18, 2014
X93154
Package Outline Drawing
M8.118
8 LEAD MINI SMALL OUTLINE PLASTIC PACKAGE
Rev 4, 7/11
5
3.0±0.05
A
DETAIL "X"
D
8
1.10 MAX
SIDE VIEW 2
0.09 - 0.20
4.9±0.15
3.0±0.05
5
0.95 REF
PIN# 1 ID
1
2
B
0.65 BSC
GAUGE
PLANE
TOP VIEW
0.55 ± 0.15
0.25
3°±3°
0.85±010
H
DETAIL "X"
C
SEATING PLANE
0.25 - 0.36
0.08 M C A-B D
0.10 ± 0.05
0.10 C
SIDE VIEW 1
(5.80)
NOTES:
(4.40)
(3.00)
1. Dimensions are in millimeters.
(0.65)
(0.40)
(1.40)
TYPICAL RECOMMENDED LAND PATTERN
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2. Dimensioning and tolerancing conform to JEDEC MO-187-AA
and AMSEY14.5m-1994.
3. Plastic or metal protrusions of 0.15mm max per side are not
included.
4. Plastic interlead protrusions of 0.15mm max per side are not
included.
5. Dimensions are measured at Datum Plane "H".
6. Dimensions in ( ) are for reference only.
FN8180.4
July 18, 2014
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