X93156WM8I-3 [XICOR]
Digital Potentiometer, 1 Func, 12500ohm, Increment/decrement Control Interface, 32 Positions, PDSO8, MSOP-8;
| 型号： | X93156WM8I-3 |
| 厂家： | 
XICOR INC. |
| 描述： | Digital Potentiometer, 1 Func, 12500ohm, Increment/decrement Control Interface, 32 Positions, PDSO8, MSOP-8 光电二极管 转换器 电阻器 |
| 文件： | 总9页 (文件大小：96K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
APPLICATION NOTE
A V A I L A B L E
AN20 • AN42–53 • AN71 • AN73 • AN88 • AN91–92 • AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
XICOR CONFIDENTIAL
Digitally Controlled Potentiometer (XDCP™)
X93156
FEATURES
DESCRIPTION
• Solid-state potentiometer
• Up/Down interface
• 32 wiper tap points
—Wiper position stored in nonvolatile memory
and recalled on power-up
The Xicor 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.
• 31 resistive elements
—Temperature compensated
—Maximum resistance tolerance of 25ꢀ
—Terminal voltage, 0 to V
• Low power CMOS
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.
CC
—V = 2.7 V – 5.5 V
CC
—Active current, 200µA typ.
—Standby current, 2µA max.
• High reliability
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 implemetnation of ladder networks.
—Endurance 200,000 data changes per bit
—Register data retention, 100 years
• R
• Packages
value = 12.5kΩ, 50kΩ
TOTAL
—8-lead MSOP, FCP,TDFN
BLOCK DIAGRAM
V
(Supply Voltage)
CC
U/D
INC
CS
5-Bit
R
31
H
Up/Down
Counter
30K
30
29
28
R
Up/Down
(U/D)
Increment
(INC)
H
5-Bit
Nonvolatile
Memory
Control
and
One
of
Thirty
Two
R
W
Memory
R
W
Transfer
Gates
Resistor
Array
Device Select
(CS)
Store and
Control
Recall
Decoder
2
Circuitry
R
L
1
0
V
V
CC
SS
V
(Ground)
SS
R
L
General
Detailed
XDCP™ is a trademark of Xicor, Inc.
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X93156
PIN CONFIGURATION
MSOP
FCP*
TDFN**
X93156
8
1
V
CC
INC
U/D
8
7
6
5
INC
U/D
1
2
3
4
V
CC
2
3
4
7
6
CS
CS
*Contact factory for FCP
X93156
R
H
R
H
R
L
R
L
V
5
V
Rw
Rw
SS
SS
**Contact factory for TDFN ordering info.
X93156 ORDERING CODES
Ordering Number
X93156WM8I-3
X93156UM8I-3
RTOTAL
Package
Temperature Range
-40°C to +85°C
12.5kΩ
50kΩ
8-lead MSOP package
8-lead MSOP package
-40°C to +85°C
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
3
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.
R
R . The R and R pins of the X93156 are equivalent to the fixed terminals of a mechanical
H H L
H
potentiometer. The minimum voltage is V and the maximum is V . The terminology of R and
SS
CC
H
R references the relative position of the terminal in relation to wiper movement direction selected
by the U/D input.
L
4
5
V
Ground.
SS
Rw
R . The Rw pin of the X93156 is the wiper terminal of the potentiometer which is equivalent to
W
the movable terminal of a mechanical potentiometer.
6
7
8
R
R . The R and R pins of the X93156 are equivalent to the fixed terminals of a mechanical
L H L
L
potentiometer. The minimum voltage is V and the maximum is V . The terminology of R and
SS
CC
H
R references the relative position of the terminal in relation to wiper movement direction selected
by the U/D input.
L
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.
V
Supply Voltage.
CC
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X93156
ABSOLUTE MAXIMUM RATINGS
COMMENT
Temperature under bias ....................–65°C to +135°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 specification) is
not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
Storage temperature ........................ –65°C to +150°C
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
Industrial
–40°C
+85°C
X93156
2.7 V to 5.5 V (7)
POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
Parameter
Min.
9.375
37.5
0
Typ.
12.5
50
Max.
15.625
62.5
Unit
kΩ
Test Conditions/Notes
R
End to end resistance
TOT
kΩ
V
R , R terminal voltages
V
V
mW(6)
R
H
L
CC
1
Power rating
Noise
-120
3
dBV(6) Ref: 1kHz
(4)
R
Wiper Resistance
Wiper Current
Resolution
1100
0.6
Ω
W
(4) (5)
I
mA
W
%
Absolute linearity(1)
Relative linearity(2)
1
MI(3)
MI(3)
V
V
–V
H(n)(actual) H(n)(expected)
0.5
–[V
]
H(n+1)
H(n)+MI
(6)
R
temperature coefficient
35
ppm/°C
pF(6)
See circuit #2
TOTAL
C /C /C
W
Potentiometer capacitances
10/10/25
H
L
Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (V
(actual)–V
(expected)) = 1 Ml
H(n)
H(n)
Maximum. n = 1 .. 29 only
(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 is periodically sampled and not 100% tested
(6) This parameter is not 100% tested.
(7) When performing multiple write operations, V
must not decrease by more than 150mV from it’s initial value.
CC
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X93156
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
Limits
(4)
Typ.
Symbol
Parameter
Min.
Max.
Unit
Test Conditions
CS = V , U/D = V or V and
I
V
CC
active current (Increment)
50
250
µA
IL
IL
IH
CC1
INC = 0.4V @ max. t
CYC
V
=3V
CC
CS = V , U/D = V or V and
200
300
600
IL
IL
IH
CYC
INC = 0.4V @ max. t
=5V
V
CC
CS = V , U/D = V or V and
I
V
active current (Store)
µA
CC
IH
IH
IL
IH
CC2
INC = V @ max. t
V
=3V
(EEPROM Store)
WR CC
CS = V , U/D = V or V and
1400
µA
µA
µA
IH
IL
IH
INC = V @ max. t
V
=5V
IH
WR CC
CS = V – 0.3V, U/D and INC =
I
Standby supply current
1
2
CC
SB
V
or V
– 0.3V V =3V
SS
CC CC
CS = V – 0.3V, U/D and INC =
CC
V
V
V
or V
– 0.3V V =5V
SS
CC CC
I
I
I
I
CS input leakage current
1
150
250
1
µA
µA
µA
µA
V
= V
CC
LI
LI
LI
LI
IN
CS input leakage current
60
100
200
= 3V, CS = 0
= 5V, CS = 0
CC
CS input leakage current
120
V
V
CC
INC, U/D input leakage current
CS, INC, U/D input HIGH voltage
CS, INC, U/D input LOW voltage
CS, INC, U/D input capacitance
= V to V
SS CC
IN
V
V
x 0.7
V
+ 0.5
IH
CC
CC
V
–0.5
V
x 0.1
CC
V
IL
(5)(7)
C
10
pF
V
= 3V, V = V
,
IN
CC
IN
SS
T = 25°C, f = 1MHz
A
ENDURANCE AND DATA RETENTION
Parameter
Minimum endurance
Data retention
Min.
200,000
100
Unit
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
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X93156
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
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
CC
WR
(6)
t V
V
CC
power-up rate
0.2
V/ms
ms
R
t
Store cycle
5
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
CC
potentiometer pins provided that V is always more positive than or equal to V and V , i.e., V
ramp rate spec is always in effect.
≥ V V . The V
CC
H
L
CC
H, L CC
A.C.Timing
CS
t
CYC
(Store)
t
t
t
t
t
CI
IL
IH
IC
CPH
90% 90%
10%
INC
U/D
t
t
t
t
R
ID
DI
F
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X93156
PIN DESCRIPTIONS
R and R
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.
H
L
The R and R pins of the X93156 are equivalent to the
H
L
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 position
H
L
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
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.
Up/Down (U/D)
The U/D input controls the direction of the wiper
movement and whether the counter is incremented or
decremented.
If the wiper is moved several positions, multiple taps are
connected to the wiper for t (INC to V change).The 2-
IW
W
Increment (INC)
terminal resistance value for the device can temporarily
change by a significant amount if the wiper is moved
several positions.
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.
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.
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.
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X93156
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 five bit counter. The output of this counter is
decoded to select one of thirty two wiper positions along
the resistive array.
CS
L
INC U/D
Mode
H
L
Wiper Up
L
Wiper Down
H
X
L
L
L
X
X
X
H
L
Store Wiper Position
Standby Current
H
No Store, Return to Standby
Wiper Up (not recommended)
Wiper Down (not recommended)
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
When left open, the CS pin is internally pulled up to V
by an internal 30k resistor.
during initial power-up.
CC
SYMBOL TABLE
CC
WAVEFORM
INPUTS
OUTPUTS
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.
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.
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X93156
MSOP PACKAGING INFORMATION
8-Lead Miniature Small Outline Gull Wing Package Type M
0.118 0.002
(3.00 0.05)
0.012 + 0.006 / -0.002
(0.30 + 0.15 / -0.05)
0.0256 (0.65) Typ.
R 0.014 (0.36)
0.118 0.002
(3.00 0.05)
0.030 (0.76)
0.0216 (0.55)
7° Typ.
0.036 (0.91)
0.032 (0.81)
0.040 0.002
(1.02 0.05)
0.008 (0.20)
0.004 (0.10)
0.0256" Typical
0.025"
Typical
0.150 (3.81)
0.007 (0.18)
0.005 (0.13)
Ref.
0.193 (4.90)
Ref.
0.220"
0.020"
Typical
8 Places
FOOTPRINT
NOTE:
1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
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X93156
TDFN PACKAGING INFORMATION
0.75 0.05
1.30 0.10
DAP Size 1.6 x 1.3
0.40 0.10
2.00 0.10
(S)
0.0–0.05
0.25 0.05 (8X)
0.50 Typ. (6X)
Pin 1 Index Area
1.50 Ref. (2X)
0.20 Ref.
©Xicor, Inc. 2004 Patents Pending
LIMITED WARRANTY
Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty,
express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement.
Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices
at any time and without notice.
Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, or licenses are implied.
TRADEMARK DISCLAIMER:
Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, BiasLock and XDCP are also trademarks of
Xicor, Inc. All others belong to their respective owners.
U.S. PATENTS
Xicor products are covered by one or more of the following U.S. Patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846;
4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691;
5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. Foreign patents and additional patents pending.
LIFE RELATED POLICY
In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection
and correction, redundancy and back-up features to prevent such an occurrence.
Xicor’s products are not authorized for use in critical components in life support devices or systems.
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to
perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or effectiveness.
Characteristics subject to change without notice. 9 of 9
REV 1.6 6/8/04
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