CAT5116
CAT5116
Log-Taper, 100-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
s
100-position, log-taper potentiometer
s
Non-volatile EEPROM wiper storage
s
10nA ultra-low standby current
s
Single-supply operation: 2.5V - 5.5V
s
Increment Up/Down serial interface
s
Resistance value: 32kΩ
Ω
s
Available in 8-pin MSOP, TSSOP, SOIC and DIP packages
H
GEN
FR
ALO
EE
APPLICATIONS
s
Remote control adjustments
s
Offset, gain and zero control
s
Audio volume control
s
Sensor adjustment
LE
A
D
F
R
E
E
TM
s
Automated product calibration
s
Motor controls and feedback systems
s
Programmable analog functions
DESCRIPTION
The CAT5116 is a log-taper 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, DPP ICs are well suited for
applications where equipment requiring periodic
adjustment is either difficult to access or located in a
hazardous or remote environment.
The CAT5116 contains a 100-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
effecting the stored setting.
Wiper-control of the CAT5116 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.
FUNCTIONAL DIAGRAM
VCC
VCC
U/D
INC
CS
CONTROL
AND
MEMORY
RH
RH
RH
UP/DOWN
U/D
INTERFACE
&
WIPER
CONTROL
RW
Potentiometer
R = 32kΩ
RW
INCREMENT
INC
CHIP SELECT
RW
EEPROM
CS
POR
RL
GND
RL
GND
RL
GENERAL
BLOCK DIAGRAM
POTENTIOMETER SCHEMATIC
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
1
Doc. No. 2118, Rev. J
Doc. No. 2118, Rev. J
CAT5116
PIN CONFIGURATION
DIP Package (P, L)
INC
U/D
R
H
GND
1
2
3
4
8
7
6
5
V
CC
CS
R
L
R
W
PIN FUNCTIONS
TSSOP Package (U, Y)
Pin Name
INC
U/D
R
H
GND
Function
Increment Control
Up/Down Control
Potentiometer High Terminal
Ground
Potentiometer Wiper Terminal
Potentiometer Low Terminal
Chip Select
Supply Voltage
CS
V
CC
INC
U/D
1
2
3
4
8
7
6
5
R
L
R
W
GND
R
H
SOIC Package (S, V)
INC
U/D
R
H
GND
1
2
3
4
8
7
6
5
V
CC
CS
R
L
R
W
MSOP Package (R, Z)
INC
U/D
R
H
GND
1
2
3
4
8
7
6
5
V
CC
CS
R
L
R
W
R
W
R
L
CS
V
CC
PIN DESCRIPTIONS
INC:
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
D
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.
Doc. No. 2118, Rev. J
CS:
CS
Chip Select
The chip select input is used to activate the control input
of the CAT5116 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.
2
CAT5116
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
V
CC
to GND ....................................... -0.5V to +7V
Inputs
CS
to GND ........................ -0.5V to VCC to +0.5V
INC
to GND ....................... -0.5V to VCC to +0.5V
U/D to GND ....................... -0.5V to VCC to +0.5V
R
H
to GND ......................... -0.5V to VCC to +0.5V
R
L
to GND ......................... -0.5V to VCC to +0.5V
R
W
to GND ........................ -0.5V to VCC to +0.5V
Operating Ambient Temperature ........ -40°C to +85°C
Junction Temperature (10 secs) ..................... +150°C
Storage Temperature ...................................... +150°C
Lead Soltering (10 sec max) ........................... +300°C
*Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Absolute Maximum
Ratings are limited values applied individually while other param-
eters are within specified operating conditions, and functional
operation at any of these conditions is NOT implied. Device
performance and reliability may be impaired by exposure to
absolute rating conditions for extended periods of time.
RELIABILITY CHARACTERISTICS
Symbol
V
ZAP(1)
I
LTH(1)(2)
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
Volts
mA
Years
Stores
DC ELECTRICAL CHARACTERISTICS:
V
CC
= 2.5V to 5.5V unless otherwise specified.
Power Supply
Symbol Parameter
V
CC
I
CC1(3)
I
CC2
ISB
1
Operating Voltage Range
Supply Current (Increment)
Supply Current (Write)
Supply Current (Standby)
Conditions
V
CC
= 5.5V, f = 1MHz, I
W
=0
V
CC
= 5.5V, f = 250kHz, I
W
=0
Programming, V
CC
= 5.5V
V
CC
= 3V
CS=V
CC
-0.3V
U/D, INC=V
CC
-0.3V or GND
Min
2.5
Typ
Max
5.5
100
50
1
500
Units
V
µA
mA
µA
µA
0.01
1
Logic Inputs
Symbol
I
IH
I
IL
V
IH1
V
IL1
V
IH2
V
IL2
NOTES:
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
≤
5.5V
Min
Typ
Max
10
-10
V
CC
0.8
V
CC
+ 0.3
V
CC
x 0.2
Units
µA
µA
V
V
V
V
2
0
V
CC
x 0.7
-0.3
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) Latch-up protection is provided for stresses up to 100mA on address and data pins from –1V to V
CC
+ 1V
(3) I
W
=source or sink
3
Doc. No. 2118, Rev. J
CAT5116
POTENTIOMETER PARAMETERS
Symbol
R
POT
R
TOL
V
RH
V
RL
R
V*
R
Wi
I
W
TC
RPOT
TC
RATIO
V
N
C
H
/C
L
/C
W
fc
Parameter
Potentiometer Resistance
Pot Resistance Tolerance
Voltage on R
H
pin
Voltage on R
L
pin
Relative Variation
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
300
20
V
CC
= 5V, I
W
= 1mA
V
CC
= 2.5V, I
W
= 1mA
200
400
0
0
Conditions
Min
Typ
32
±
20
V
CC
V
CC
0.05
400
1000
1
mA
ppm/
o
C
ppm/
o
C
nV/ H
z
pF
MHz
Ω
Max
Units
kΩ
%
V
V
* Relative variation is a measure of the error in step size between taps
= log (V
W(N)
) - log(V
W(N-1)
) = 0.045 + 0.003
AC TEST CONDITIONS
V
CC
Range
Input Pulse Levels
Input Rise and Fall Times
Input Reference Levels
2.5V
≤
V
CC
≤
5.5V
0.2V
CC
to 0.7V
CC
10ns
0.5V
CC
AC OPERATING CHARACTERISTICS
V
CC
= +2.5V to +5.5V, V
H
= V
CC
, V
L
= 0V
, unless otherwise specified
Symbol
t
CI
t
DI
t
ID
t
IL
t
IH
t
IC
t
CPH1
t
CPH2
t
IW
t
CYC
t
R,
t
F(2)
t
PU(2)
t
WR
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
Typ
(1)
Max
Units
ns
ns
ns
ns
ns
µs
ns
ms
µs
µs
µs
msec
ms
1
1
5
500
1
10
5
Doc. No. 2118, Rev. J
4
CAT5116
TYPICAL CHARACTERISTICS
V
CC
= 5V, T
AMB
= 25°C,
unless otherwise specified
Wiper-Low/High Resistances vs. Wiper Position
100
90
Total Resistance (%)
70
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
RH-RW
RW-RL
Wiper-Low Resistance vs. Wiper Position (log scale)
100.0
Total Resistance (%) .
80
10.0
1.0
0.1
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
WIPER POSITION
WIPER POSITION
Wiper Resistance vs. Wiper Voltage
STANDBY CURRENT [nA] .
600
WIPER RESISTANCE [ohm]
500
400
300
200
100
0
0
1
2
3
4
WIPER VOLTAGE[V]
5
6
Vcc = 4.4V
Tap 84
Vcc = 3.0V
Tap 84
Standby Supply Current vs. Temperature
100
80
60
40
20
Vcc = 2.5 V
0
-40
-15
10
35
60
85
TEMPERATURE [°C]
Vcc = 5 V
5
Doc. No. 2118, Rev. J
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