A
PPLICATION
N
OTES
A V A I L A B L E
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Terminal Voltage ±5V, 32 Taps
X9511
Single Digitally-Controlled (XDCP
™
) Potentiometer (Push Button Controlled)
FEATURES
• Push button controlled
• Low power CMOS
—Active current, 3mA max
—Standby current, 200µA max
• 31 resistive elements
—Temperature compensated
—
±
20% end to end resistance range
—–5V to +5V range
• 32 wiper tap points
—Wiper positioned via two push button inputs
—Slow & fast scan modes
—AUTOSTORE
®
option
—Manual store option
—Wiper position stored in nonvolatile memory
and recalled on power-up
• 100 year wiper position data retention
• X9511W = 10K
Ω
• Packages
—8-lead PDIP
—8-lead SOIC
DESCRIPTION
The Xicor X9511 is a push button controlled potentiom-
eter that is ideal for push button controlled resistance
trimming.
The X9511 is a resistor array composed of 31 resistive
elements. Between each element and at either end are
tap points accessible to the wiper element. The position
of the wiper element is controlled by the PU and PD
inputs. The position of the wiper can be automatically
stored in E
2
memory and then be recalled upon a sub-
sequent power-on operation.
The resolution of the X9511 is equal to the maximum
resistance value divided by 31. As an example, for the
X9511W (10K
Ω
) each tap point represents 323
Ω
.
All Xicor nonvolatile products are designed and tested
for applications requiring extended endurance and data
retention.
BLOCK DIAGRAM
PU
PD
5-Bit
Up/Down
Counter
31
30
29
V
CC
V
SS
5-Bit
EEPROM
Memory
28
One
of
One
Hundred
Decoder
2
ASE
Store and
Recall
Control
Circuitry
1
0
V
L
/R
L
V
W
/R
W
V
H
/R
H
Transfer
Gates
Resistor
Array
AUTOSTORE is a registered trademark of Xicor, Inc.
REV 1.1 2/27/01
www.xicor.com
Characteristics subject to change without notice.
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X9511
PIN DESCRIPTIONS
V
H
/R
H
and V
L
/R
L
The high (V
H
/R
H
) and low (V
L
/R
L
) terminals of the
X9511 are equivalent to the fixed terminals of a
mechanical potentiometer. The minimum voltage is –5V
and the maximum is +5V. It should be noted that the
terminology of V
L
/R
L
and V
H
/R
H
reference the relative
position of the terminal in relation to wiper movement
direction selected by the PU and PD inputs, and not the
voltage potential on the terminal.
PU
The debounced PU input is for incrementing the wiper
position. An on-chip pull-up holds the PU input HIGH. A
switch closure to ground or a LOW logic level will, after
a debounce time, move the wiper to the next adjacent
higher tap position.
PD
The debounced PD input is for decrementing the wiper
position. An on-chip pull-up holds the PD input HIGH. A
switch closure to ground or a LOW logic level will, after
a debounce time, move the wiper to the next adjacent
lower tap position.
ASE
The debounced ASE (AUTOSTORE enable) pin can be
in one of two states:
V
IL
—AUTOSTORE is enabled. When V
CC
powers
down, an automatic store cycle takes place.
V
IH
—AUTOSTORE is disabled. A LOW to HIGH will ini-
tiate a manual store operation. This is for the user who
wishes to connect a push button switch to this pin. For
every valid push, the X9511 will store the current wiper
position to the EEPROM.
PIN CONFIGURATION
DIP/SOIC
INC
U/D
V
H
/R
H
V
SS
1
2
3
4
X9511
8
7
6
5
V
CC
CS
V
L
/R
L
V
W
/R
W
PIN NAMES
Symbol
V
H
/R
H
V
W
/R
W
V
L
/R
L
V
SS
V
CC
PU
PD
ASE
Description
High Terminal
Wiper Terminal
Low Terminal
Ground
Supply Voltage
Push Up Input
Push Down Input
AUTOSTORE Enable Input
DEVICE OPERATION
There are three sections of the X9511: the input control,
counter and decode section; the EEPROM 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 EEPROM 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 trans-
fers the potential at that point to the wiper.
The X9511 is designed to interface directly to two push
button switches for effectively moving the wiper up or
down. The PU and PD inputs increment or decrement a
5-bit counter respectively. The output of this counter is
decoded to select one of the thirty-two wiper positions
along the resistive array. The wiper increment input, PU
and the wiper decrement input, PD are both connected
to an internal pull-up so that they normally remain
HIGH. When pulled LOW by an external push button
switch or a logic LOW level input, the wiper will be
switched to the next adjacent tap position.
Internal debounce circuitry prevents inadvertent switch-
ing of the wiper position if PU or PD remain LOW for
less than 40ms, typical. Each of the buttons can be
pushed either once for a single increment/decrement or
continuously for a multiple increments/decrements. The
number of increments/decrements of the wiper position
depend on how long the button is being pushed. When
making a continuous push, after the first second, the
increment/decrement speed increases. For the first
second the device will be in the slow scan mode. Then
if the button is held for longer than 1 second the device
will go into the fast scan mode. As soon as the button is
released the X9511 will return to a standby condition.
REV 1.1 2/27/01
www.xicor.com
Characteristics subject to change without notice.
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X9511
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.
AUTOSTORE
The value of the counter is stored in EEPROM memory
whenever the chip senses a power-down of V
CC
while
ASE is enabled (held LOW). When power is restored,
the content of the memory is recalled and the counter
reset to the last value stored.
If AUTOSTORE is to be implemented, ASE is typically
hard wired to V
SS
. If ASE is held HIGH during power-
up and then taken LOW, the wiper will not respond to
the PU or PD inputs until ASE is brought HIGH and
held HIGH.
Figure 1. Typical circuit with ASE store pin
controlled by push button switch
V
CC
8
1
2
7
V
CC
PU
PD
ASE
V
H
V
W
V
L
V
SS
3
5
6
8
1
2
7
V
CC
PU
PD
ASE
V
SS
V
H
V
W
V
L
4
3
5
6
Manual (Push Button) Store
When ASE is not enabled (held HIGH) a push button
switch may be used to pull ASE LOW and released to
perform a manual store of the wiper position.
R
TOTAL
with V
CC
Removed
The end to end resistance of the array will fluctuate
once V
CC
is removed.
Figure 2. Typical circuit with ASE store pin used in
AUTOSTORE mode
V
CC
3.3µF
2KΩ
REV 1.1 2/27/01
www.xicor.com
Characteristics subject to change without notice.
3 of 10
X9511
ABSOLUTE MAXIMUM RATINGS
Temperature under bias ....................–65
°
C to +135
°
C
Storage temperature .........................–65
°
C to +150
°
C
Voltage on PU, PD, and V
CC
with respect to V
SS
.................................. –1V to +7V
Voltage on V
H
and V
L
referenced to V
SS
.................................... –8V to +8V
∆
V = |V
H
–V
L
|
X9511W ............................................................. 10V
Lead temperature (soldering 10 seconds)..........300
°
C
Wiper current
............................................................±
1mA
ANALOG CHARACTERISTICS
Electrical Characteristics
End-to-end resistance tolerance
.......................... ±
20%
Power rating at 25
°
C
X9511W ......................................................... 10mW
Wiper current
................................................. ±
1mA Max.
Typical wiper resistance ...........................40
Ω
at 1mA
Typical noise ............................ < –120dB/
√
Hz Ref: 1V
Resolution
Resistance ............................................................ 3%
Linearity
Absolute linearity
(1)
............................................±
1.0 Ml
(2)
Relative linearity
(3)
.............................................±
0.2 Ml
(2)
Notes:
(1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (V
w(n)
(actual)–V
w(n)
(expected)) =
±1
Ml
Maximum.
(2) 1 Ml = Minimum Increment = R
TOT
/31.
(3) Relative linearity is a measure of the error in step size between taps = V
W(n+1)
– [V
w(n)
+ Ml] = +0.2 Ml
COMMENT
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 reli-
ability.
Temperature Coefficient
–40
°C
to +85°C
X9511W ...................................... +300 ppm/°C Typical
Ratiometric temperature coefficient
................±20
ppm
Wiper Adjustability
Unlimited wiper adjustment....... (Non-Store operation)
Wiper position store operations.......................100,000
data changes
Physical Characteristics
Marking Includes
Manufacturer’s Trademark
Resistance Value or Code
Date Code
SYMBOL TABLE
WAVEFORM
INPUTS
Must be
steady
May change
from Low to
High
May change
from High to
Low
Don’t Care:
Changes
Allowed
N/A
OUTPUTS
Will be
steady
Will change
from Low to
High
Will change
from High to
Low
Changing:
State Not
Known
Center Line
is High
Impedance
REV 1.1 2/27/01
www.xicor.com
Characteristics subject to change without notice.
4 of 10
X9511
RECOMMENDED OPERATING CONDITIONS
Temperature
Commercial
Industrial
Min.
0°C
–40°C
Max.
+70°C
+85°C
Supply Voltage
X9511
Limits
5V
±10%
D.C. OPERATING CHARACTERISTICS
(Over recommended operating conditions unless otherwise specified.)
Limits
Symbol
I
CC
I
SB
I
LI
V
IH
V
lL
R
W
V
VH
V
VL
C
IN
(5)
Parameter
V
CC
active current
Standby supply current
PU, PD, ASE input leakage current
PU, PD, ASE input HIGH voltage
PU, PD, ASE input LOW voltage
Wiper resistance
VH terminal voltage
VL terminal voltage
ASE, PU, PD input capacitance
Min.
Typ.
(4)
1
100
Max.
3
200
10
V
CC
+ 1
0.8
Unit
mA
µA
µA
V
V
Ω
V
V
pF
Test Conditions
PU or PD held at V
IL
the other at V
IH
PU = PD = V
IH
V
IN
= V
SS
to V
CC
2
–1
40
–5
–5
100
+5
+5
10
Max. Wiper Current
±1mA
V
CC
= 5V, V
IN
= 0V, T
A
= 25°C,
f = 1MHz
STANDARD PARTS
Part Number
X9511W
Maximum Resistance
10KW
Wiper Increments
323Ω
Minimum Resistance
40Ω
Notes:
(4) Typical values are for T
A
= 25°C and nominal supply voltage.
(5) This parameter is periodically sampled and not 100% tested.
A.C. OPERATING CHARACTERISTICS
(Over recommended operating conditions unless otherwise specified.)
Limits
Symbol
t
GAP
t
DB
t
S SLOW
t
S FAST
(7)
t
PU
(7)
t
R
V
CC
(7)
t
ASTO
(7)
V
ASTH
(7)
V
ASEND
(7)
Debounce time
After debounce to wiper change on a slow mode
Wiper change on a fast mode
Power up to wiper stable
V
CC
power-up rate
AUTOSTORE cycle time
AUTOSTORE threshold voltage
AUTOSTORE cycle end voltage
0.2
2
4
3.5
100
25
Parameter
Time between two separate push button events
Min.
0
Typ.
(6)
30
250
50
Max.
60
375
75
500
50
Unit
µs
ms
ms
ms
µs
mV/
µs
ms
V
V
POWER UP AND DOWN REQUIREMENTS
The are no restrictions on the sequencing of V
CC
and the voltage applied to the potentiometer pins during power-up
or power-down conditions. During power-up, the data sheet parameters for the DCP do not fully apply until 1ms
after V
CC
reaches its final value. The V
CC
ramp rate spec is always in effect.
REV 1.1 2/27/01
www.xicor.com
Characteristics subject to change without notice.
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