X9313ZMIT2 [XICOR]
Digital Potentiometer, 1 Func, 1000ohm, Increment/decrement Control Interface, 32 Positions, CMOS, PDSO8, MSOP-8;
| 型号： | X9313ZMIT2 |
| 厂家： | 
XICOR INC. |
| 描述： | Digital Potentiometer, 1 Func, 1000ohm, Increment/decrement Control Interface, 32 Positions, CMOS, PDSO8, MSOP-8 光电二极管 转换器 电阻器 |
| 文件： | 总10页 (文件大小：88K) |
| 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
Terminal Voltages ±±Vꢀ ꢁ3 Taꢂs
X9ꢁ1ꢁ
Digitally Controlled Potentiometer (XDCP™)
FEATURES
DESCRIPTION
• Solid-state ꢂotentiometer
• ꢁ-wire serial interface
• ꢁ3 wiꢂer taꢂ ꢂoints
—Wiꢂer ꢂosition stored in nonvolatile memory
and recalled on ꢂower-uꢂ
The Xicor X9313 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. Between each element and at
either end are tap points accessible to the wiper
terminal. 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.
• ꢁ1 resistive elements
—Temꢂerature comꢂensated
—End to end resistance range ± 320
—Terminal voltagesꢀ –±V to +±V
• Low ꢂower CMOS
—V = ꢁV or ±V
CC
—Active currentꢀ ꢁmA max.
—Standby currentꢀ ±22µA max.
• High reliability
—Enduranceꢀ 122ꢀ222 data changes ꢂer bit
—Register data retentionꢀ 122 years
The device can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including:
• R
• Packages
values = 1KΩꢀ 12KΩꢀ ±2KΩ
TOTAL
– control
—8-lead SOICꢀ MSOP and DIP
– parameter adjustments
– signal processing
BLOCK DIAGRAMS
5-Bit
U/D
INC
CS
R /V
31
H
H
Up/Down
Counter
V
(Supply Voltage)
CC
30
29
28
R /V
Up/Down
(U/D)
H
H
5-Bit
Nonvolatile
Memory
One
of
Control
Increment
(INC)
R
/V
W
and
W
Memory
Thirty
Two
Transfer
Gates
Resistor
Array
Device Select
(CS)
Decoder
R /V
L
L
2
Store and
Recall
Control
Circuitry
V
(Ground)
SS
1
0
V
V
CC
SS
General
R /V
L
L
R
/V
W
W
Detailed
Characteristics subject to change without notice. 1 of 10
REV 1.5 10/7/03
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X9ꢁ1ꢁ
PIN DESCRIPTIONS
PIN CONFIGURATION
R /V and R /V
H
L
H
L
8-Lead DIP/SOIC
The high (R /V ) and low (R /V ) terminals of the
H
L
H
L
INC
U/D
1
2
3
4
8
7
6
5
V
CC
X9313 are equivalent to the fixed terminals of a
mechanical potentiometer. The terminology of R /V
CS
L
L
X9313
and R /V references the relative position of the
R /V
L
H
R /V
H
L
H
V
H
terminal in relation to wiper movement direction
selected by the U/D input and not the voltage potential
on the terminal.
R
/V
W
SS
W
8-Lead MSOP
RW/VW
R /V
H
H
U/D
INC
1
2
3
4
8
R /V is the wiper terminal and is equivalent to the
W
w
V
SS
movable terminal of a mechanical potentiometer. The
position of the wiper within the array is determined by
the control inputs. The wiper terminal series resistance
7
X9313
6
R
/V
W
W
V
CC
R /V
L
L
CS
5
is typically 40Ω at V = 5V.
CC
Uꢂ/Down (U/D)
PIN NAMES
The U/D input controls the direction of the wiper
movement and whether the counter is incremented or
decremented.
Symbol
Descriꢂtion
R /V
High terminal
Wiper terminal
Low terminal
Ground
H
H
W
L
R /V
W
Increment (INC)
R /V
L
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.
V
SS
CC
V
Supply voltage
U/D
INC
CS
Up/Down control input
Increment control input
Chip Select control input
Chiꢂ 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 X9313
will be placed in the low power standby mode until the
device is selected once again.
Characteristics subject to change without notice. 2 of 10
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X9ꢁ1ꢁ
PRINCIPLES OF OPERATION
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.
There are three sections of the X9313: 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
potential 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
preference, system parameter changes due to
temperature drift, etc...
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.
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.
MODE SELECTION
The electronic switches on the device operate in a
“make before break” mode when the wiper changes
tap positions. If the wiper is moved several positions,
CS
L
INC U/D
Mode
H
L
Wiper Up
multiple taps are connected to the wiper for t (INC to
L
Wiper Down
IW
V
change). The R
value for the device can
W
TOTAL
H
X
L
L
L
X
X
X
H
L
Store Wiper Position
temporarily be reduced by a significant amount if the
wiper is moved several positions.
H
Standby Current
No Store, Return to Standby
Wiper Up (not recommended)
Wiper Down (not recommended)
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.
SYMBOL TABLE
INSTRUCTIONS AND PROGRAMMING
WAVEFORM
INPUTS
OUTPUTS
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 seven bit counter. The output of this
counter is decoded to select one of thirty two wiper
positions along the resistive array.
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
The value of the counter is stored in nonvolatile
memory whenever CS transitions HIGH while the INC
input is also HIGH.
N/A
Center Line
is High
Impedance
The system may select the X9313, move the wiper
and deselect the device without having to store the
latest wiper position in nonvolatile memory. After the
Characteristics subject to change without notice. 3 of 10
REV 1.5 10/7/03
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X9ꢁ1ꢁ
ABSOLUTE MAXIMUM RATINGS
COMMENT
Temperature under bias ....................–65°C to +135°C
Storage temperature .........................–65°C to +150°C
Voltage on CS, INC, U/D, and
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only; 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.
V
CC
with respect to V .........................–1V to +7V
SS
Voltage on V , V , V
H
L
W
with respect to V ..................................–6V to +7V
SS
∆V = |V –V |
H
L
X9313Z ................................................................... 4V
X9313W, X9313U.................................................. 10V
Lead temperature (soldering 10 seconds)..........300°C
I
(10 seconds) .............................................. 8.8mA
W
RECOMMENDED OPERATING CONDITIONS
Temꢂerature
Commercial
Industrial
Min.
0°C
Max.
+70°C
+85°C
Suꢂꢂly Voltage (V
X9313
)
Limits
5V 10ꢀ
3V to 5.5V
CC
–40°C
X9313-3
POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
Parameter
Min.
Tyꢂ.
Max.
20
Unit
ꢀ
Test Conditions/Notes
End to end resistance tolerance
V
V terminal voltage
–5V
–5V
+5V
+5V
10
V
VH
H
V
V terminal voltage
L
V
VL
Power rating
Power rating
Wiper resistance
Wiper current
Noise
mW
mW
Ω
R
R
≥ 10 KΩ
= 1 KΩ
TOTAL
16
TOTAL
R
40
100
4.4
I
= 1mA, V = 5V
W
W CC
I
mA
W
-120
3
dBV
Ref: 1kHz
R –R
Resolution
ꢀ
Absolute linearity(1)
Relative linearity(2)
1
MI(3)
MI(3)
ppm/°C
ppm/°C
pF;
w(n)(actual) w(n)(expected)
0.2
R
–[R
]
w(n+1)
w(n)+MI
R
temperature coefficient
300
TOTAL
Ratiometric temperature coefficient
Potentiometer capacitances
20
C /C /C
W
10/10/25
See Circuit #3
H
L
Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (V
(actual)–V
(expected)) = 1 Ml
w(n)
w(n)
Maximum.
(2) Relative linearity is a measure of the error in step size between taps = R
–[R
+ Ml] = 0.2 Ml.
w(n)
W(n+1)
(3) 1 Ml = Minimum Increment = R
/31.
TOT
Characteristics subject to change without notice. 4 of 10
REV 1.5 10/7/03
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X9ꢁ1ꢁ
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)
Limits
(4)
Symbol
Parameter
active current
Min. Tyꢂ.
Max.
Unit
Test Conditions
I
V
CC
1
3
mA
CS = V , U/D = V or V and
CC
IL
IL
IH
INC = 0.4V/2.4V @ max. t
CYC
I
Standby supply current
200
500
10
µA
CS = V – 0.3V, U/D and
CC
SB
INC = V or V – 0.3V
SS
CC
I
CS, 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
µA
V
V
= V to V
SS
LI
IN
CC
V
2
V
+ 1
CC
IH
V
–1
0.8
10
V
IL
(5)
C
pF
V
= 5V, V = V , T = 25°C,
CC IN SS A
IN
f = 1MHz
ENDURANCE AND DATA RETENTION
Parameter
Minimum endurance
Data retention
Min.
100,000
100
Unit
Data changes per bit per register
Years
Notes: (4) Typical values are for T = 25°C and nominal supply voltage.
A
(5) This parameter is periodically sampled and not 100ꢀ tested.
Test Circuit #1
Test Circuit #3
Circuit #ꢁ SPICE Macro Model
R
V /R
H
TOTAL
H
V /R
H
H
R
R
L
H
Test Point
C
L
C
W
C
H
10pF
V
S
Test Point
/R
V
/R
Force
Current
W
W
25pF
V
W
W
10pF
V /R
L
L
V /R
R
L
L
W
A.C. CONDITIONS OF TEST
Input pulse levels
0V to 3V
10ns
Input rise and fall times
Input reference levels
1.5V
Characteristics subject to change without notice. 5 of 10
REV 1.5 10/7/03
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X9ꢁ1ꢁ
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified)
Limits
(6)
Symbol
Parameter
Min.
100
100
2.9
1
Tyꢂ.
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
µs
t
INC LOW period
µs
lL
lH
lC
t
t
INC HIGH period
1
µs
INC Inactive to CS inactive
CS deselect time (STORE)
CS deselect time (NO STORE)
INC to Vw change
1
µs
t
t
20
ms
ns
CPH
CPH
100
t
1
5
5
µs
IW
t
INC cycle time
4
µs
CYC
(7)
t
t
INC input rise and fall time
Power up to wiper stable
500
5
µs
,
R
F
(7)
t
µs
PU
(7)
t V
V
CC
power-up rate
0.2
50
10
V/ms
ms
R
CC
t
Store cycle
WR
POWER UP AND DOWN REQUIREMENTS
The recommended power up sequence is to apply V /V first, then the potentiometer voltages. During power-
CC SS
up, the data sheet parameters for the DCP do not fully apply until 1 millisecond after V
reaches its final value.
CC
The V
ramp spec is always in effect. In order to prevent unwanted tap position changes, or an inadvertant store,
CC
bring the CS and INC high before or concurrently with the V pin on powerup.
CC
A.C. TIMING
CS
t
CYC
t
t
t
t
t
CPH
CI
IL
IH
IC
90ꢀ 90ꢀ
10ꢀ
INC
U/D
t
t
t
t
R
ID
DI
F
t
IW
(8)
MI
V
W
Notes: (6) Typical values are for T = 25°C and nominal supply voltage.
A
(7) This parameter is not 100ꢀ tested.
(8) MI in the A.C. timing diagram refers to the minimum incremental change in the V output due to a change in the wiper position.
W
Characteristics subject to change without notice. 6 of 10
REV 1.5 10/7/03
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X9ꢁ1ꢁ
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.
Basic Configurations of Electronic Potentiometers
V
R
V
R
V
V
H
V
/R
W
W
L
I
Three terminal potentiometer;
variable voltage divider
Two terminal variable resistor;
variable current
Basic Circuits
Noninverting Amꢂlifier
Buffered Reference Voltage
Cascading Techniques
R
+5V
1
+V
+V
LM308A
+V
V
+
–
S
+5V
V
O
V
OP-07
W
+
–
V
REF
–5V
X
V
OUT
V
/R
W
W
R
2
+V
–5V
= V /R
R
1
V
V
W
OUT
W
W
(a)
(b)
V
= (1+R /R )V
2 1 S
O
Voltage Regulator
Offset Voltage Adjustment
Comꢂarator with Hysteresis
R
R
2
1
V
V (REG)
O
317
IN
LT311A
V
S
V
–
+
S
V
O
R
1
100KΩ
–
+
V
O
I
adj
TL072
R
2
10KΩ
10KΩ
+12V
R
R
1
2
V
V
= {R /(R +R )} V (max)
1 1 2 O
UL
LL
10KΩ
-12V
= {R /(R +R )} V (min)
1 1 2 O
V
(REG) = 1.25V (1+R /R )+I
R
adj 2
O
2
1
(for additional circuits see AN115)
Characteristics subject to change without notice. 7 of 10
REV 1.5 10/7/03
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X9ꢁ1ꢁ
PACKAGING INFORMATION
8-Lead Miniature Small Outline Gull Wing Package Tyꢂe 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)
Characteristics subject to change without notice. 8 of 10
REV 1.5 10/7/03
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X9ꢁ1ꢁ
PACKAGING INFORMATION
8-Lead Plastic Small Outline Gull Wing Package Tyꢂe S
0.150 (3.80) 0.228 (5.80)
0.158 (4.00) 0.244 (6.20)
Pin 1 Index
Pin 1
0.014 (0.35)
0.019 (0.49)
0.188 (4.78)
0.197 (5.00)
(4X) 7°
0.053 (1.35)
0.069 (1.75)
0.004 (0.19)
0.010 (0.25)
0.050 (1.27)
0.010 (0.25)
0.020 (0.50)
0.050"Typical
X 45°
0.050"
Typical
0° - 8°
0.0075 (0.19)
0.010 (0.25)
0.250"
0.016 (0.410)
0.037 (0.937)
0.030"
Typical
8 Places
FOOTPRINT
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
Characteristics subject to change without notice. 9 of 10
REV 1.5 10/7/03
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X9ꢁ1ꢁ
ORDERING INFORMATION
X9ꢁ1ꢁX
X
X
X
V
Limits
CC
Blank = 4.5V to 5.5V
3 = 3V to 5.5V
Temꢂerature Range
Blank = Commercial = 0°C to +70°C
I = Industrial = –40°C to +85°C
Package
M = 8-Lead MSOP
P = 8-Lead Plastic DIP
S = 8-Lead SOIC
End to End Resistance
Z =
1KΩ
W =
U =
10KΩ
50KΩ
Physical Characteristics
Marking Includes
Manufacturer’s Trademark
Resistance Value or Code
Date Code
©Xicor, Inc. 2003 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, 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. 10 of 10
REV 1.5 10/7/03
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