DATASHEET

X93254
®
Data Sheet
February 4, 2008
Dual Digitally Controlled Potentiometers
(XDCPs™)
FN8186.1
Features
• Dual solid-state potentiometers
The Intersil X93254 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.
• 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 of ± 30%
- Terminal voltage, 0 to VCC
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 during a subsequent power-up operation.
• Low power CMOS
- VCC = 3V ±10%
- Active current, 250µA max
- Standby current, 1µA max
Each potentiometer is connected as a two-terminal variable
resistor and can be used in a wide variety of applications
including:
• High reliability
- Endurance 200,000 data changes per bit
- Register data retention, 100 years
• Bias and Gain control
• LCD Contrast Adjustment
• RTOTAL value = 50kΩ
Pinout
• 14 Ld TSSOP package
X93254
(14 LD TSSOP)
TOP VIEW
DNC*
1
14
RH1
RL1
2
13
U/D1
CS1
3
12
INC1
INC2
4
11
VCC
U/D2
5
10
CS2
RH2
6
9
RL2
VSS
7
8
DNC*
*Do not connect.
Ordering Information
PART NUMBER
X93254UV141-3
PART MARKING VCC LIMITS (V)
X9325 4UVE
1
3 ±10%
RTOTAL (kΩ)
TEMP
RANGE (°C)
50
-40 to +85
PACKAGE
14 Ld TSSOP
PKG DWG. #
M14.173
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X93254
Block Diagram
VCC (SUPPLY VOLTAGE)
RH1
30k
30k
UP/DOWN
(U/D1)
CONTROL
AND
MEMORY
INCREMENT
(INC1)
RL1
RH2
DEVICE SELECT
(CS1)
UP/DOWN
(U/D2)
RL2
CONTROL
AND
MEMORY
INCREMENT
(INC2)
DEVICE SELECT
(CS2)
VSS (Ground)
Pin Descriptions
TSSOP
SYMBOL
1
DNC
Do Not Connect
2
RL1
Low Terminal 1
3
CS1
Chip Select 1
4
INC2
Increment 2
5
U/D2
Up/Down 2
6
RH2
High Terminal 2
7
VSS
Ground
8
DNC
Do Not Connect
9
RL2
Low Terminal 2
10
CS2
Chip Select 2
11
VCC
Supply Voltage
12
INC1
Increment 1
13
U/D1
Up/Down 1
14
RH1
High Terminal 1
2
DESCRIPTION
FN8186.1
February 4, 2008
X93254
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
Temperature under bias. . . . . . . . . . . . . . . . . . . . . .-65°C to +135°C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Lead temperature (soldering 10s) . . . . . . . . . . . . . . . . . . . . . +300°C
Maximum reflow temperature (40s) . . . . . . . . . . . . . . . . . . . . +240°C
Recommended Operating Conditions
Temperature Range
Industrial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Supply Voltage
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3V ±10% (Note 6)
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.
NOTES:
1. 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
2. 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.
3. 1 Ml = Minimum Increment = RTOT/31.
4. Typical values are for TA = +25°C and nominal supply voltage.
5. Limits established by characterization and are not production tested.
6. When performing multiple write operations, VCC must not decrease by more than 150mV from its initial value.
7. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
Potentiometer Specifications Over recommended operating conditions, unless otherwise stated.
SYMBOL
RTOT
VR
PARAMETER
TEST CONDITIONS/NOTES
End-to-End Resistance
RH, RL Terminal Voltages
MIN
(Note 7)
TYP
(Note 4)
MAX
(Note 7)
UNIT
37.5
50
62.5
kΩ
VCC
V
1
mΩ
(Note 5)
0
Power Rating
RTOTAL = 50kΩ
Noise
Ref: 1kHz
RW
Wiper Resistance
(Note 5)
1000
Ω
IW
Wiper Current
(Note 5)
0.6
mA
Resolution
CH/CL/CW
-120
dBV
(Note 5)
3
Absolute Linearity (Note 1)
VH(n)(actual) - VH(n)(expected)
Relative Linearity (Note 2)
VH(n+1) - [VH(n)+MI
RTOTAL Temperature Coefficient
(Note 5)
Potentiometer Capacitances
See “Circuit #2 SPICE Macro
Model” on page 4
3
%
±1
MI
(Note 3)
±0.5
MI
(Note 3)
±35
ppm/°C
10/10/25
pF
(Note 5)
FN8186.1
February 4, 2008
X93254
.
DC Operating Specifications Over recommended operating conditions unless otherwise stated.
SYMBOL
PARAMETER
MIN
(Note 7)
TEST CONDITIONS/NOTES
TYP
(Note 4)
MAX
(Note 7)
UNIT
50
250
µA
600
µA
ICC1
VCC Active Current (Increment) per DCP
CS = VIL, U/D = VIL or VIH and
INC = 0.4V @ max. tCY
ICC2
VCC Active Current (Store) (EEPROM
Store) per DCP
CS = VIH, U/D = VIL or VIH and
INC = VIH @ max. tWR
ISB
Standby Supply Current
CS = VCC - 0.3V, U/D and INC = VSS
or VCC - 0.3V
1
µA
ILI
CS1 or CS2
VIN = VCC
±1
µA
ILI
CS1 or CS2
VCC = 3V, CS = 0
150
µA
ILI
INC1, INC2, U/D1, U/D2 Input Leakage
Current
VIN = VSS to VCC )
±1
µA
VIH
CS1, CS2, INC1, INC2, U/D1, U/D2 Input
HIGH Voltage
VCC x 0.7
VCC + 0.5
V
VIL
CS1, CS2, INC1, INC2, U/D1, U/D2 Input
HIGH Voltage
-0.5
VCC x 0.1
V
CIN
CS1, CS2, INC1, INC2, U/D1, U/D2 Input
Capacitance
10
pF
100
VCC = 3V, VIN = VSS, TA = +25°C,
f = 1MHz (Note 5)
Circuit #2 SPICE Macro Model
Endurance and Data Retention
PARAMETER
MIN
UNIT
Minimum endurance
200,000
Data changes per bit
Data retention
60
100
RTOTAL
RH
Years
CH
CL
CW
RL
10pF
Test Circuit #1
25pF
TEST POINT
10pF
VH/RH
AC Conditions of Test
VL
Input pulse levels
0V to 3V
Input rise and fall times
10ns
Input reference levels
1.5V
AC Operating Specifications Over recommended operating conditions, unless otherwise stated. CS, INC, U/D, RH and RL are used to
refer to either CS1 or CS2, etc.
SYMBOL
PARAMETER
MIN
(Note 7)
TYP
(Note 4)
MAX
(Note 7)
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
4
FN8186.1
February 4, 2008
X93254
AC Operating Specifications Over recommended operating conditions, unless otherwise stated. CS, INC, U/D, RH and RL are used to
refer to either CS1 or CS2, etc. (Continued)
SYMBOL
tCYC
INC Cycle Time
TYP
(Note 4)
MAX
(Note 7)
UNIT
2
tR, tF
(Note 5)
INC input Rise and Fall Time
tR VCC
(Note 5)
VCC Power-up Rate
tWR
MIN
(Note 7)
PARAMETER
µs
1
Store Cycle
5
500
µs
50
V/ms
10
ms
AC Timing
CS
tCYC
tCI
tIL
tIH
tIC
(STORE)
tCPH
90%
INC
90%
10%
tID
tDI
tF
tR
U/D
Note: CS, INC, U/D, RH and RL are used to refer
to either CS1 or CS2, etc.
Power-up and Power-down Requirements
Increment (INC)
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.
The INC input is negative-edge triggered. Toggling INC will
move the wiper and either increment or decrement the
corresponding potentiometer’s counter in the direction
indicated by the logic level on the corresponding
potentiometer’s U/D input.
Chip Select (CS)
Pin Descriptions
In the text, CS, INC, U/D, RH and RL are used to refer to
either CS1 or CS2, etc. Note: These signals can be applied
independently or at the same time.
RH and RL
The RH and RL pins of the X93254 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 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.
5
A potentiometer is selected when the corresponding CS input
is LOW. Its current counter value is stored in nonvolatile
memory when the corresponding CS is returned HIGH while
the corresponding 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
X93254: 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
FN8186.1
February 4, 2008
X93254
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.
adjustments might be based on user preference, system
parameter changes due to temperature drift, or other system
trim requirements.
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.
The state of U/D may be changed while CS remains LOW.
This allows the host system to enable the device and then
move each wiper up and down until the proper trim is
attained.
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.
Mode Selection
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.
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
potentiometer 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 each CS transitions HIGH while the INC input is
also HIGH. In order to avoid an accidental store during
power-up, each CS must go HIGH with VCC during initial
power-up. When left open, each CS pin is internally pulled up
to VCC by an internal 30k resistor.
The system may select the X93254, move any 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.
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
6
CS
INC
U/D
MODE
L
H
Wiper Up
L
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)
H
Symbol Table
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
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
3. The retentivity of nonvolatile memory used for the storage
of multiple potentiometer settings or data
FN8186.1
February 4, 2008
X93254
.
VR
I
Two terminal variable resistor.
Variable current
Low Voltage High Impedance Instrumentation Amplifier
3.3V
10k
+
+
10k
50k
U1A
–
50k
–
VIN
VOUT
U1C
1/ 2 X93254 (R
TOTAL)
+
50k
–
50k
50k )
( 1+
10k
RTOTAL
U1 = LT1467
GAIN =
10k
U1B
10k
+
–
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
1/ 2 X93254 (R
TOTAL)
Single Supply Variable Gain Amplifier
3.3V
3.3V
20k
+
20k
VOUT
U1
–
GAIN =
10k
U1 = LMC6042
VIN
10k
7
RTOTAL
1/ 2 X93254
(RTOTAL)
FN8186.1
February 4, 2008
X93254
Thin Shrink Small Outline Plastic Packages (TSSOP)
M14.173
N
INDEX
AREA
E
0.25(0.010) M
E1
2
SYMBOL
3
0.05(0.002)
-A-
INCHES
GAUGE
PLANE
-B1
14 LEAD THIN SHRINK SMALL OUTLINE PLASTIC
PACKAGE
B M
0.25
0.010
SEATING PLANE
L
A
D
-C-
e
α
A1
b
A2
c
0.10(0.004)
0.10(0.004) M
C A M
B S
MIN
1. These package dimensions are within allowable dimensions of
JEDEC MO-153-AC, Issue E.
MILLIMETERS
MIN
MAX
NOTES
A
-
0.047
-
1.20
-
A1
0.002
0.006
0.05
0.15
-
A2
0.031
0.041
0.80
1.05
-
b
0.0075
0.0118
0.19
0.30
9
c
0.0035
0.0079
0.09
0.20
-
D
0.195
0.199
4.95
5.05
3
E1
0.169
0.177
4.30
4.50
4
e
0.026 BSC
0.65 BSC
-
E
0.246
0.256
6.25
6.50
-
L
0.0177
0.0295
0.45
0.75
6
8o
0o
N
NOTES:
MAX
α
14
0o
14
7
8o
Rev. 2 4/06
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate burrs.
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. Interlead flash and protrusions shall not exceed 0.15mm (0.006 inch) per
side.
5. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
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. Controlling dimension: MILLIMETER. Converted inch dimensions
are not necessarily exact. (Angles in degrees)
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
8
FN8186.1
February 4, 2008