CAT5115
32-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
32-position linear taper potentiometer
Low power CMOS technology
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 CAT5115 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 CAT5115 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 is always set to the mid
point, tap 15 at power up. The tap position is not
stored in memory. Wiper-control of the CAT5115 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.
The digitally programmable potentiometer can be used
as a three-terminal resistive divider or as a two-terminal
variable resistor. DPPs bring variability and program-
mability to a wide variety of applications including
control, parameter adjustments, and signal processing.
For a pin-compatible device that recalls a stored tap
position on power-up refer to the CAT5114 data sheet.
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 13.
FUNCTIONAL DIAGRAM
V
CC
V
DD
R
H
U/D
INC
CS
Control
and
Power-On
Recall
R
W
GND
32-POSITION
DECODER
R
H
/V
H
R
H
CS
UP-DOWN
COUNTER
INC
U/D
R
W
/V
W
R
W
R
L
GND
R
L
/V
L
R
L
Electronic Potentiometer
Implementation
General
Detailed
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-2117 Rev. H
CAT5115
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
GND
R
W
R
L
¯¯
CS
V
CC
Increment Control
Up/Down Control
Potentiometer High Terminal
Ground
Buffered Wiper Terminal
Potentiometer Low Terminal
Chip Select
Supply Voltage
CAT
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)
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 CAT5115 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 CAT5115 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
mechanical 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 R
L
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 five-bit up/down counter whose
output is decoded to select the wiper position.
¯¯
With CS set LOW the CAT5115 is selected and will
¯
¯¯¯
respond to the U/D and INC inputs. HIGH to LOW
¯¯¯
transitions on INC will increment or decrement the
¯
wiper (depending on the state of the U/D input and
five-bit counter). The wiper, when at either fixed
terminal, acts like its mechanical equivalent and does
not move beyond the last position. When the
CAT5115 is powered-down, the wiper position is
reset. When power is restored, the counter is set to
the mid point, tap 15.
Doc. No. MD-2117 Rev. H
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5115
R
H
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
(1)
Operation
Wiper toward H
Wiper toward L
Store Wiper Position
No Store, Return to Standby
Standby
C
H
R
WI
R
W
C
W
C
L
R
L
Potentiometer
Equivalent Circuit
ABSOLUTE MAXIMUM RATINGS
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
Units
V
V
V
V
V
V
V
-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
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)
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
T
DR
N
END
DC ELECTRICAL CHARACTERISTICS
V
CC
= +2.5V to +6V unless otherwise specified
Power Supply
Symbol
V
CC
I
CC1
I
SB1(3)
Parameter
Operating Voltage Range
Supply Current (Increment)
Supply Current (Standby)
V
CC
= 6V, f = 1MHz, I
W
= 0
V
CC
= 6V, f = 250kHz, I
W
= 0
¯¯
CS = V
CC
- 0.3V
¯ ¯¯¯
U/D, INC = V
CC
- 0.3V or GND
Conditions
Min
2.5
–
–
–
Typ
–
–
–
0.01
Max
6
100
50
1
Units
V
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.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-2117 Rev. H
CAT5115
Logic Inputs
Symbol
I
IH
I
IL
V
IH1
V
IL1
V
IH2
V
IL2
Parameter
Input Leakage Current
Input Leakage Current
TTL High Level Input Voltage
TTL Low Level Input Voltage
CMOS High Level Input Voltage
CMOS Low Level Input Voltage
Conditions
V
IN
= V
CC
V
IN
= 0V
4.5V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
6V
Min
–
–
2
0
V
CC
x 0.7
-0.3
Typ
–
–
–
–
–
–
Max
10
-10
V
CC
0.8
V
CC
+ 0.3
V
CC
x 0.2
Units
µA
µA
V
V
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
(1)
±50
0
0
3.2
0.5
0.25
70
150
1
0.5
200
400
1
±300
20
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-2117 Rev. H
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5115
AC CONDITIONS OF TEST
V
CC
Range
Input Pulse Levels
Input Rise and Fall Times
Input
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