CAT5114
32-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
32-position linear taper potentiometer
Non-volatile EEPROM wiper storage
Low standby current
Single supply operation: 2.5V – 6V
Increment up/down serial interface
Resistance values: 10kΩ, 50kΩ and 100kΩ
Available in PDIP, SOIC, TSSOP, MSOP and
space saving 2 x 2.5mm TDFN packages
DESCRIPTION
The CAT5114 is a single digitally programmable
potentiometer (DPP™) designed as a electronic
replacement for mechanical potentiometers and trim
pots. Ideal for automated adjustments on high volume
production lines, they are also well suited for
applications where equipment requiring periodic
adjustment is either difficult to access or located in a
hazardous or remote environment.
The CAT5114 contains a 32-tap series resistor array
connected between two terminals R
H
and R
L
. An up/
down counter and decoder that are controlled by three
input pins, determines which tap is connected to the
wiper, R
W
. The wiper setting, stored in nonvolatile
memory, is not lost when the device is powered down
and is automatically reinstated when power is
returned. The wiper can be adjusted to test new
system values without affecting the stored setting.
Wiper-control of the CAT5114 is accomplished with
¯¯
¯
¯¯¯
¯¯¯
three input control pins, CS, U/D, and INC. The INC
input increments the wiper in the direction which is
¯
¯¯
determined by the logic state of the U/D input. The CS
input is used to select the device and also store the
wiper position prior to power down.
The digitally programmable potentiometer can be
used as a three-terminal resistive divider or as a two-
terminal variable resistor. DPPs bring variability and
programmability to a wide variety of applications
including control, parameter adjustments, and signal
processing.
APPLICATIONS
Automated product calibration
Remote control adjustments
Offset, gain and zero control
Tamper-proof calibrations
Contrast, brightness and volume controls
Motor controls and feedback systems
Programmable analog functions
For Ordering Information details, see page 14.
FUNCTIONAL DIAGRAM
V
CC
R
H
/V
H
U/D
INC
CS
Power On Recall
R
L
/V
L
V
CC
GND
STORE AND
RECALL
CONTROL
CIRCUITRY
5-BIT
NONVOLATILE
MEMORY
U/D
INC
CS
5-BIT
UP/DOWN
COUNTER
31
30
R
H
/V
H
R
H
/V
H
29
28
32-POSITION
DECODER
2
1
0
TRANSFER
GATES
RESISTOR
ARRAY
Control
and
Memory
R
W
/V
W
R
W
/V
W
GND
R
L
/V
L
R
W
/V
W
R
L
/V
L
Electronic Potentiometer
Implementation
Doc. No. MD-2007 Rev. R
General
Detailed
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
CAT5114
PIN CONFIGURATION
PDIP 8-Lead (L), SOIC 8-Lead (V),
MSOP 8-Lead (Z)
¯¯¯
INC
¯
U/D
R
H
GND
1
2
3
4
8
V
CC
¯¯
CS
R
L
R
WB
7
6
5
PIN DESCRIPTIONS
Name Function
¯¯¯
INC
¯
U/D
R
H
R
W
R
L
¯¯
CS
V
CC
Increment Control
Up/Down Control
Potentiometer High Terminal
Wiper Terminal
Potentiometer Low Terminal
Chip Select
Supply Voltage
CAT
GND Ground
TSSOP 8-Lead (Y)
¯¯
CS
V
CC
¯¯¯
INC
¯
U/D
1
2
3
4
8
R
L
R
WB
GND
R
H
7
6
5
TDFN 8-Pad
(ZD7, VP2)
Top View
¯¯¯
INC
1
¯
U/D
2
R
H
3
GND
4
8
V
CC
¯¯
7
CS
6
R
L
5
R
WB
CAT
PIN FUNCTION
¯¯¯
INC:
Increment Control Input
¯¯¯
The INC input moves the wiper in the up or down
¯
direction determined by the condition of the U/D input.
¯
U/D:
Up/Down Control Input
¯
The U/D input controls the direction of the wiper
¯¯
movement. When in a high state and CS is low, any
¯¯¯
high-to-low transition on INC will cause the wiper to
move one increment toward the R
H
terminal. When in
¯¯
a low state and CS is low, any high-to-low transition
¯¯¯
on INC will cause the wiper to move one increment
towards the R
L
terminal.
R
H
:
High End Potentiometer Terminal
R
H
is the high end terminal of the potentiometer. It is
not required that this terminal be connected to a
potential greater than the R
L
terminal. Voltage applied
to the R
H
terminal cannot exceed the supply voltage,
V
CC
or go below ground, GND.
R
W
:
Wiper Potentiometer Terminal
R
W
is the wiper terminal of the potentiometer. Its
position on the resistor array is controlled by the
¯¯¯
¯
¯¯
control inputs, INC, U/D and CS.
Voltage applied to
the R
W
terminal cannot exceed the supply voltage,
V
CC
or go below ground, GND.
R
L
:
Low End Potentiometer Terminal
R
L
is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential less
than the R
H
terminal. Voltage applied to the R
L
terminal
cannot exceed the supply voltage, V
CC
or go below
ground, GND. R
L
and R
H
are electrically interchangeable.
¯¯
CS:
Chip Select
The chip select input is used to activate the control
input of the CAT5114 and is active low. When in a
¯¯¯
¯
high state, activity on the INC and U/D inputs will not
affect or change the position of the wiper.
DEVICE OPERATION
The
CAT5114 operates like a digitally controlled
potentiometer with R
H
and R
L
equivalent to the high
and low terminals and R
W
equivalent to the mecha–
nical potentiometer's wiper. There are 32 available tap
positions including the resistor end points, R
H
and R
L
.
There are 31 resistor elements connected in series
between the R
H
and RL terminals. The wiper terminal
is connected to one of the 32 taps and controlled by
¯¯¯
¯
¯¯
three inputs, INC, U/D and CS. These inputs control a
seven-bit up/down counter whose output is decoded
to select the wiper position. The selected wiper
position can be stored in non-volatile memory using
¯¯¯
¯¯
the INC and CS inputs.
¯¯
With CS set LOW the CAT5114 is selected and will
¯
¯¯¯
respond to the U/D and INC inputs. HIGH to LOW
¯¯¯
transitions on INC wil increment or decrement the wiper
¯
(depending on the state of the U/D input and seven-bit
counter). The wiper, when at either fixed terminal, acts
like its mechanical equivalent and does not move
beyond the last position. The value of the counter is
¯¯
stored in nonvolatile memory whenever CS transitions
¯¯¯
HIGH while the INC input is also HIGH. When the
CAT5114 is powered-down, the last stored wiper counter
position is maintained in the nonvolatile memory. When
power is restored, the contents of the memory are
recalled and the counter is set to the value stored.
¯¯¯
With INC set low, the CAT5114 may be de-selected
and powered down without storing the current wiper
position in nonvolatile memory. This allows the system
to always power
up to a preset value stored in non
-
volatile memory.
2
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
Doc. No. MD-2007 Rev. R
CAT5114
OPERATION MODES
¯¯¯
INC
High to Low
High to Low
High
Low
X
¯¯
CS
Low
Low
Low to High
Low to High
High
¯
U/D
High
Low
X
X
X
Operation
Wiper toward H
Wiper toward L
Store Wiper Position
No Store, Return to Standby
Standby
C
L
R
L
C
W
C
H
R
H
R
WI
R
W
Potentiometer
Equivalent Circuit
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
Supply Voltage
V
CC
to GND
Inputs
¯¯
CS to GND
¯¯¯
INC to GND
¯
U/D to GND
H to GND
L to GND
W to GND
Ratings
-0.5 to +7V
-0.5 to V
CC
+0.5
-0.5 to V
CC
+0.5
-0.5 to V
CC
+0.5
-0.5 to V
CC
+0.5
-0.5 to V
CC
+0.5
-0.5 to V
CC
+0.5
Units
V
V
V
V
V
V
V
Parameters
Operating Ambient Temperature
Industrial (‘I’ suffix)
Junction Temperature
Storage Temperature
Lead Soldering (10s max)
Ratings
-40 to +85
+150
-65 to 150
+300
Units
ºC
ºC
ºC
ºC
RELIABILITY CHARACTERISTICS
Symbol
V
ZAP (2)
I
LTH (2)(3)
T
DR
N
END
Parameter
ESD Susceptibility
Latch-Up
Data Retention
Endurance
Test Method
MIL-STD-883, Test Method 3015
JEDEC Standard 17
MIL-STD-883, Test Method 1008
MIL-STD-883, Test Method 1003
Min
2000
100
100
1,000,000
Typ
Max
Units
V
mA
Years
Stores
DC ELECTRICAL CHARACTERISTICS
V
CC
= +2.5V to +6V unless otherwise specified
Power Supply
Symbol
V
CC
I
CC1
I
CC2
I
SB1(3)
Parameter
Operating Voltage Range
Supply Current (Increment)
Supply Current (Write)
Supply Current (Standby)
V
CC
= 6V, f = 1MHz, I
W
= 0
V
CC
= 6V, f = 250kHz, I
W
= 0
Programming, V
CC
= 6V
V
CC
= 3V
¯¯
CS = V
CC
- 0.3V
¯ ¯¯¯
U/D, INC = V
CC
- 0.3V or GND
Conditions
Min
2.5
–
–
–
–
–
Typ
–
–
–
–
–
–
Max
6.0
100
50
1000
500
1
Units
V
µA
µA
µA
µA
µA
Notes
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) This parameter is tested initially and after a design or process change that affects the parameter.
(3) Latch-up protection is provided for stresses up to 100mA on address and data pins from -1V to V
CC
+ 1V.
(4) I
W
= source or sink.
(5) These parameters are periodically sampled and are not 100% tested.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-2007 Rev. R
CAT5114
Logic Inputs
Symbol
I
IH
I
IL
V
IH2
V
IL2
Parameter
Input Leakage Current
Input Leakage Current
CMOS High Level Input Voltage
CMOS Low Level Input Voltage
Conditions
V
IN
= V
CC
V
IN
= 0V
2.5V
≤
V
CC
≤
6V
Min
–
–
V
CC
x 0.7
-0.3
Typ
–
–
–
–
Max
10
-10
V
CC
+ 0.3
V
CC
x 0.2
Units
µA
µA
V
V
Potentiometer Characteristics
Symbol
R
POT
Parameter
Potentiometer Resistance
Pot. Resistance Tolerance
V
RH
V
RL
INL
DNL
R
WI
I
W
TC
RPOT
TC
RATIO
V
N
C
H
/C
L
/C
W
fc
Voltage on R
H
pin
Voltage on R
L
pin
Resolution
Integral Linearity Error
Differential Linearity Error
Wiper Resistance
Wiper Current
TC of Pot Resistance
Ratiometric TC
Noise
Potentiometer Capacitances
Frequency Response
Passive Attenuator, 10kΩ
100kHz / 1kHz
8/24
8/8/25
1.7
I
W
≤
2µA
I
W
≤
2µA
V
CC
= 5V, I
W
= 1mA
V
CC
= 2.5V, I
W
= 1mA
-4.4
300
20
0
0
3.2
0.5
0.25
70
150
1
0.5
200
400
4.4
Conditions
-10 Device
-50 Device
-00 Device
Min
Typ
10
50
100
±20
V
CC
V
CC
%
V
V
%
LSB
LSB
Ω
Ω
mA
ppm/ºC
ppm/ºC
nV/√Hz
pF
MHz
kΩ
Max
Units
Doc. No. MD-2007 Rev. R
4
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5114
AC CONDITIONS OF TEST
V
CC
Range
Input Pulse Levels
Input Rise and Fall Times
Input Reference Levels
2.5V
≤
V
CC
≤
6V
0.2V
CC
to 0.7V
CC
10ns
0.5V
CC
AC OPERATING CHARACTERISTICS
V
CC
= +2.5V to +6.0V, V
H
= V
CC
, V
L
= 0V, unless otherwise specified
Symbol
t
CI
t
DI
t
ID
t
IL
t
IH
t
IC
t
CPH
t
CPH
t
IW
t
CYC
t
R
, t
F
(2)
Parameter
¯¯
¯¯¯
CS to INC Setup
¯ ¯¯¯
U/D to INC Setup
¯ ¯¯¯
U/D to INC Hold
¯¯¯
INC LOW Period
¯¯¯
INC HIGH Period
¯¯¯
¯¯
INC Inactive to CS Inactive
¯¯
CS Deselect Time (NO STORE)
¯¯
CS Deselect Time (STORE)
¯¯¯
INC to V
OUT
Change
¯¯¯
INC Cycle Time
¯¯¯
INC Input Rise and Fall Time
Power-up to Wiper Stable
Store Cycle
Min
100
50
100
250
250
1
100
10
–
1
–
–
–
Typ
(1)
–
–
–
–
–
–
–
–
1
–
–
–
5
Max
–
–
–
–
–
–
–
–
5
–
500
1
10
Units
ns
ns
ns
ns
ns
µs
ns
ms
µs
µs
µs
ms
ms
t
PU(2)
t
WR
A.C. TIMING
CS
(store)
t
CPH
90%
10%
t
DI
U /D
t
ID
t
F
t
R
90%
t
CI
INC
t
IL
t
CYC
t
IH
t
IC
t
IW
R
W
MI
(3)
Notes
(1) Typical values are for T
A
= 25ºC and nominal supply voltage.
(2) This parameter is periodically sampled and not 100% tested.
(3) MI in the A.C. Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-2007 Rev. R
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