X93254UV14I-3 [INTERSIL]
Dual Digitally Controlled Potentiometers; 双数字电位器
| 型号： | X93254UV14I-3 |
| 厂家： | 
Intersil |
| 描述： | Dual Digitally Controlled Potentiometers |
| 文件： | 总10页 (文件大小：208K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
X93254
®
Data Sheet
March 1, 2005
FN8186.0
DESCRIPTION
Dual Digitally Controlled Potentiometers
(XDCPs™)
The Intersil X93254 is a dual digitally controlled poten-
tiometer (XDCP). The device consists of two resistor
arrays, wiper switches, a control section, and nonvola-
tile memory. The wiper positions are controlled by indi-
vidual Up/Down interfaces.
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 of ± 30%
A potentiometer is implemented by a resistor array
composed of 31 resistive elements and a wiper switch-
ing 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 non-
volatile memory and then be recalled upon a subse-
quent power-up operation.
—Terminal voltage, 0 to V
• Low power CMOS
CC
—V
= 3V±10%
Each potentiometer is connected as a two-terminal
variable resistor and can be used in a wide variety of
applications including:
CC
—Active current, 250µA max
—Standby current, 1µA max
• High reliability
—Endurance 200,000 data changes per bit
—Register data retention, 100 years
– Bias and Gain control
– LCD Contrast Adjustment
• R
value = 50kΩ
TOTAL
• 14-lead TSSOP package
BLOCK DIAGRAM
V
(Supply Voltage)
CC
R
H1
30K
30K
Up/Down
(U/D )
1
R
L1
Control
and
Memory
Increment
(INC )
1
R
H2
Device Select
(CS )
1
Up/Down
(U/D )
2
R
L2
Control
and
Memory
Increment
(INC )
2
Device Select
(CS )
2
V
(Ground)
SS
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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.
X93254
PIN CONFIGURATION
TSSOP
DNC
*
R
H1
14
13
12
1
2
3
R
U/D
L1
1
X93254
CS
INC
V
1
2
2
1
INC
U/D
R
CC
11
10
9
4
5
CS
2
R
6
7
L2
H2
SS
8
V
DNC
*
*Do not connect.
X93254 ORDERING CODES
Ordering Number
RTOTAL
Package
Temperature Range
X93254UV14I-3
50kΩ
14-lead TSSOP package
-40°C to +85°C
PIN DESCRIPTIONS
TSSOP Symbol
Description
1
2
DNC
Do Not Connect.
R
Low Terminal 1.
L1
3
4
5
6
7
CS
Chip Select 1.
Increment 2.
Up/Down 2.
High Terminal 2.
Ground.
1
INC
U/D
2
2
R
H2
V
SS
8
9
DNC
Do Not Connect.
R
Low Terminal 2.
L2
10
11
12
13
14
CS
Chip Select 2.
Supply Voltage.
Increment 1.
2
V
CC
INC
U/D
1
1
Up/Down 1.
R
High Terminal 1.
H1
FN8186.0
March 1, 2005
2
X93254
ABSOLUTE MAXIMUM RATINGS
COMMENT
Temperature under bias.................... -65°C to +135°C
Storage temperature ......................... -65°C to +150°C
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 specifi-
cation) is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect
device reliability.
Voltage on CS, INC, U/D, R , R and V
H
L
CC
with respect to V .............................. -1V to +6.5V
SS
Lead temperature (soldering 10 seconds)......... 300°C
Maximum reflow temperature (40 seconds) ...... 240°C
Maximum resistor current.....................................2mA
RECOMMENDED OPERATING CONDITIONS
Temperature
Min.
Max.
Supply Voltage (V
)
Limits
CC
(7)
Industrial
-40°C
+85°C
X93254
3V ± 10%
POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
Parameter
Min.
37.5
0
Typ.
Max.
Unit
kΩ
V
Test Conditions/Notes
R
End to end resistance
50
62.5
(5)
(5)
TOT
V
R , R terminal voltages
V
R
H
L
CC
1
(6)
(5)
Power rating
Noise
mW
dBV
Ω
R
= 50kΩ
TOTAL
(6)
(5)
-120
3
Ref: 1kHz
(5) (6)
(5) (6)
(5)
R
Wiper Resistance
Wiper Current
Resolution
1000
0.6
W
I
mA
%
W
(1)
(3)
(5)
Absolute linearity
(2)
±1
MI
MI
V
V
- V
H(n)(actual)
H(n)(expected)
(5)
(3)
Relative linearity
temperature coefficient
±0.5
- [V
H(n+1)
H(n)+MI
R
±35
ppm/°C (5) (6)
pF
TOTAL
(5)
C /C /C
W
Potentiometer capacitances
10/10/25
See circuit #2
H
L
Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (V
Maximum. n = 1 .. 29 only
(actual) - V
(expected)) = ±1 Ml
H(n)
H(n)
(2) Relative linearity is a measure of the error in step size between taps = V
- [V
+ Ml] = ±0.5 Ml, n = 1 .. 29 only.
H(n)
H(n+1)
(3) 1 Ml = Minimum Increment = R
/31.
TOT
(4) Typical values are for T = 25°C and nominal supply voltage.
A
(5) This parameter only applies to a single potentiometer.
(6) This parameter is guaranteed by characterization.
(7) When performing multiple write operations, V
must not decrease by more than 150mV from its initial value.
CC
FN8186.0
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March 1, 2005
X93254
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
Limits
(4)
Symbol
Parameter
Min.
Typ.
Max.
Unit
Test Conditions
I
V
DCP
active current (Increment) per
50
250
µA
CS = V , U/D = V or V and
CC
CC1
IL
IL
IH
(5)
INC = 0.4V @ max. t
CY
I
V
active current (Store)
600
1
µA
µA
CS = V , U/D = V or V and
IH IL IH
CC
CC2
(5)
INC = V @ max. t
IH WR
(EEPROM Store) per DCP
I
Standby supply current
CS = V – 0.3V, U/D and
CC
SB
INC = V or V
- 0.3V
SS
CC
(5)
I
I
I
CS or CS
±1
150
±1
µA
µA
µA
V
V
V
= V
CC
LI
LI
LI
1
2
2
IN
(5)
CS or CS
60
100
= 3V, CS = 0
CC
1
(5)
INC , INC , U/D , U/D input
= V to V
SS CC
1
2
1
2
IN
leakage current
V
CS , CS , INC , INC , U/D ,
V
x 0.7
V + 0.5
CC
V
V
(5)
(5)
IH
1
2
1
2
1
CC
U/D input HIGH voltage
2
V
CS , CS , INC , INC , U/D ,
-0.5
V
x 0.1
IL
1
2
1
2
1
CC
U/D input HIGH voltage
2
C
CS , CS , INC , INC , U/D ,
10
pF
V
= 3V, V = V
IN
,
SS
IN
1
2
1
2
1
CC
(6)
U/D input capacitance
T = 25°C, f = 1MHz
2
A
ENDURANCE AND DATA RETENTION
Parameter
Minimum endurance
Data retention
Min.
Unit
200,000
100
Data changes per bit
Years
Test Circuit #1
Circuit #2 SPICE Macro Model
Test Point
V /R
H
H
R
TOTAL
R
R
L
H
C
L
C
W
C
H
10pF
25pF
10pF
A.C. CONDITIONS OF TEST
Input pulse levels
0V to 3V
Input rise and fall times
Input reference levels
10ns
1.5V
FN8186.0
March 1, 2005
4
X93254
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified. In the
table, CS, INC, U/D, R and R are used to refer to either CS or CS , etc.)
H
L
1
2
Limits
(6)
Typ.
Symbol
Parameter
Min.
100
100
100
1
Max.
Unit
ns
t
t
CS to INC setup
Cl
lD
DI
INC HIGH to U/D change
U/D to INC setup
ns
t
ns
t
INC LOW period
µs
lL
lH
lC
t
t
INC HIGH period
1
µs
INC Inactive to CS inactive
CS Deselect time (NO STORE)
CS Deselect time (STORE)
INC cycle time
1
µs
t
t
t
250
10
2
ns
CPH
CPH
CYC
ms
µs
(6)
t
t
INC input rise and fall time
500
10,000
10
µs
,
R
F
(6)
t
V
V
CC
power-up rate
1
V/ms
ms
R
CC
t
Store cycle
5
WR
POWER-UP AND DOWN REQUIREMENTS
There are no restrictions on the power-up or power-down conditions of V
and the voltages applied to the potenti-
≥ V V . The V ramp
CC
is always more positive than or equal to V and V , i.e., V
ometer pins provided that V
CC
H
L
CC
H, L
CC
rate spec is always in effect.
A.C. TIMING (In the diagram, CS, INC, U/D, R and R are used to refer to either CS or CS , etc.)
H
L
1
2
CS
t
CYC
(Store)
t
t
t
t
t
CI
IL
IH
IC
CPH
90%
90%
INC
U/D
10%
t
t
t
t
R
ID
DI
F
FN8186.0
5
March 1, 2005
X93254
PIN DESCRIPTIONS
(In the text, CS, INC, U/D, R and R are used to refer
If the wiper is moved several positions, multiple taps
are connected to the wiper for t (INC to V
change). The 2-terminal resistance value for the
device can temporarily change by a significant amount
if the wiper is moved several positions.
IW
W
H
L
to either CS or CS , etc. Note: These signals can be
1
2
applied independently or at the same time.)
R and R
When the device is powered-down, the last wiper posi-
tion stored will be maintained in the nonvolatile mem-
ory for each potentiometer. When power is restored,
the contents of the memory are recalled and each
wiper is set to the value last stored.
H
L
The R and R pins of the X93254 are equivalent to
H
L
the fixed terminals of a mechanical potentiometer. The
minimum voltage is V and the maximum is V . The
SS
CC
terminology of R and R references the relative posi-
H
L
tion of the terminal in relation to wiper movement
direction selected by the U/D input per potentiometer.
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 five bit counter. The output of
this counter is decoded to select one of thirty two wiper
positions along the resistive array.
Up/Down (U/D)
The U/D input controls the direction of a single potenti-
ometer’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 decre-
ment the corresponding potentiometer’s counter in the
direction indicated by the logic level on the corre-
sponding potentiometer’s U/D input.
The value of the counter is stored in nonvolatile mem-
ory 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 V
dur-
CC
ing initial power-up. When left open, each CS pin is
internally pulled up to V by an internal 30K resistor.
Chip Select (CS)
CC
A potentiometer is selected when the corresponding CS
input is LOW. Its current counter value is stored in non-
volatile memory when the corresponding CS is returned
HIGH while the corresponding INC input is also HIGH.
After the store operation is complete the affected poten-
tiometer will be placed in the low power standby mode
until the potentiometer is selected once again.
The system may select the X93254, move any wiper
and deselect the device without having to store the lat-
est 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.
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 connect-
ing 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 com-
prised 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.
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 pref-
erence, system parameter changes due to tempera-
ture 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.
FN8186.0
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March 1, 2005
X93254
The state of U/D may be changed while CS remains
SYMBOL TABLE
LOW. This allows the host system to enable the
device and then move each wiper up and down until
the proper trim is attained.
WAVEFORM
INPUTS
OUTPUTS
Must be
steady
Will be
steady
MODE SELECTION
CS
L
INC U/D
Mode
May change
from Low to
High
Will change
from Low to
High
H
L
Wiper Up
May change
from High to
Low
Will change
from High to
Low
L
Wiper Down
H
X
L
L
L
X
X
X
H
L
Store Wiper Position
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
H
Standby Current
No Store, Return to Standby
Wiper Up (not recommended)
Wiper Down (not recommended)
N/A
Center Line
is High
Impedance
FN8186.0
7
March 1, 2005
X93254
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, and
(3) the retentivity of nonvolatile memory used for the storage of multiple potentiometer settings or data.
V
R
I
Two terminal variable resistor.
Low Voltage High Impedance Instrumentation Amplifier
3.3V
10K
+
+
10K
50K
U1A
–
50K
–
+
V
U1C
OUT
V
1
IN
/2 X93254 (R
)
TOTAL
50K
–
50K
10K
50K
Gain =
1 +
)
(
R
10K
TOTAL
U1B
+
U1 = LT1467
10K
–
50K
Micro-Power LCD Contrast Control
3.3V
300K
240K
100K
3.3V
100K
+
–
1 +
= -3.88
100K
V
V
)
(
OUT
50K + R
TOTAL
U1A
–
+
= -2.75V to -11.6V
OUT
U1B
U1 = LMC6042
100K
–12V
50K
1
/2 X93254 (R
)
TOTAL
FN8186.0
8
March 1, 2005
X93254
APPLICATIONS INFORMATION (Continued)
Single Supply Variable Gain Amplifier
3.3V
20K
3.3V
+
–
20K
U1
V
OUT
R
TOTAL
10K
Gain =
U1 = LMC6042
V
IN
1
/2 X93254
(R
10K
)
TOTAL
FN8186.0
9
March 1, 2005
X93254
PACKAGING INFORMATION
14-Lead Plastic, TSSOP, Package Code V14
.025 (.65) BSC
.169 (4.3)
.177 (4.5)
.252 (6.4) BSC
.193 (4.9)
.200 (5.1)
.041 (1.05)
.0075 (.19)
.0118 (.30)
.002 (.05)
.006 (.15)
.010 (.25)
Gage Plane
0° - 8°
Seating Plane
.019 (.50)
.029 (.75)
Detail A (20X)
.031 (.80)
.041 (1.05)
See Detail “A”
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
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
FN8186.0
10
March 1, 2005
相关型号：
X93256WV14I-2.7T1
DUAL 12.5K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 32 POSITIONS, PDSO14, 4.40 MM, PLASTIC, MO-153AC, TSSOP-14
RENESAS
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