CAT5133
16 Volt Digital
Potentiometer (POT) with
128 Taps and an Increment
Decrement Interface
Description
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The CAT5133 is a high voltage digital POT integrated with
EEPROM memory and control logic to operate in a similar manner to
a mechanical potentiometer. The digital ponentiometer consists of a
series of resistive elements connected between two externally
accessible end points. The tap points between each resistive element
are connected to the wiper outputs with CMOS switches. A 7-bit wiper
control register (WCR) independently controls the wiper tap switches
for the digital potentiometer. Associated with the control register is a
7-bit nonvolatile memory data register (DR) used for storing the wiper
settings. Changing the value of the wiper control register or storing
that value into the nonvolatile memory is performed via a 3-input
Increment-Decrement interface.
The CAT5133 comes with 2 voltage supply inputs: V
CC
(digital
supply voltage) input and V+ (analog bias supply) input. Providing
separate Digital and Analog inputs allow the potentiometer terminals
to be as much as 10 volts above V
CC
and 16 volts above ground.
The CAT5133 can be used as a potentiometer or as a two terminal,
variable resistor. It is designed for circuit level or system level
adjustments in a wide variety of applications.
On power-up, the contents of the nonvolatile data register (DR) are
transferred to the wiper control register (WCR) and the wiper is
positioned to that location. The CAT5133 is shipped with the DR
programmed to position 64.
Features
MSOP−10
Z SUFFIX
CASE 846AE
PIN CONNECTIONS
1
U/D
GND
V
CC
CS
N/C
(Top View)
INC
V+
R
L
R
W
R
H
ORDERING INFORMATION
Device
CAT5133ZI−10−GT3
CAT5133ZI−50−GT3
(Note 4)
CAT5133ZI−00−GT3
(Note 4)
Package
MSOP−10
(Pb−Free)
MSOP−10
(Pb−Free)
MSOP−10
(Pb−Free)
Shipping
†
3,000/
Tape & Reel
3,000/
Tape & Reel
3,000/
Tape & Reel
Single Linear Digital Potentiometer with 128 Taps
End-to-End Resistance of 10 kW, 50 kW or 100 kW
2-wire Interface
Fast Up/Down Wiper Control Mode
Non-volatile Wiper Setting Storage
Automatic Wiper Setting Recall at Power−up
Digital Supply Range (V
CC
): 2.7 V to 5.5 V
Analog Supply Range (V+): +8 V to +16 V
Low Standby Current: 15
mA
100 Year Wiper Setting Memory
Industrial Temperature Range:
−40C
to +85C
10-pin MSOP Package
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
1. For detailed information and a breakdown of
device nomenclature and numbering systems,
please see the ON Semiconductor Device No-
menclature document, TND310/D, available at
www.onsemi.com.
2. All packages are RoHS-compliant (Lead-Free,
Halogen-Free).
3. The standard lead finish is NiPdAu.
4. For additional package and temperature options,
please contact your nearest ON Semiconductor
Sales office.
Applications
LCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Semiconductor Components Industries, LLC, 2013
Gain Adjustment
Line Impedance Matching
VCOM Settings Adjustment
1
Publication Order Number:
CAT5133/D
July, 2013
−
Rev. 5
CAT5133
V
CC
UP/DOWN
(U/D)
Increment
(INC)
Device Select
(CS)
7−Bit
Nonvolatile
Memory
Register
(DR)
7−Bit Wiper
Control
Register
(WCR)
0
Control Logic and
Address Decode
127 Resistive
128 Tap Position
Decode Control
Elements
V+
127
R
H
R
L
R
W
Figure 1. Block Diagram
Table 1. PIN DESCRIPTIONS
Pin
1
2
3
4
5
6
7
8
9
10
Name
U/D
GND
V
CC
CS
N/C
R
H
R
W
R
L
V
+
INC
Function
Up/Down Data Input – Determines the direction of movement of the wiper
Ground
Logic Supply Voltage (2.7 V to 5.5 V)
Chip Select
−
The chip is selected when the input is low.
No Connect
High Reference Terminal for the Potentiometer
Wiper Terminal for the Potentiometer
Low Reference Terminal for the Potentiometer
Analog Bias Voltage Input (+8.0 V to +16.0 V)
Increment Input – Moves the wiper in the direction determined by the Up/Down input on each negative edge
Device Operation
The CAT5133 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 128 available tap positions
including the resistor end points, R
H
and R
L
. There are 127
resistor elements connected in series between the R
H
and R
L
terminals. The wiper terminal is connected to one of the 128
taps and controlled by three inputs, INC, U/D and CS. These
inputs control a 7-bit up/down counter whose output is
decoded to select the wiper position. The selected wiper
position can be stored in nonvolatile memory using the INC
and CS inputs.
With CS set LOW the CAT5133 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 7-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 CAT5133 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 CAT5133 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 nonvolatile memory.
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CAT5133
Table 2. 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
H
R
W
R
W
C
W
R
H
Figure 2. Potentiometer Equivalent Circuit
Power-On and Potentiometer Characteristics
The CAT5133 is a 128-position, digital controlled
potentiometer. When applying power to the CAT5133, V
CC
must be supplied prior to or simultaneously with V+. At the
same time, the signals on R
H
, R
W
and R
L
terminals should
not exceed V+. If V+ is applied before V
CC
, the electronic
switches of the digital potentiometer are powered in the
absence of the switch control signals, that could result in
multiple switches being turned on. This causes unexpected
wiper settings and possible current overload of the
potentiometer.
When V
CC
is applied, the device turns on at the mid-point
wiper location (64) until the wiper register can be loaded
with the nonvolatile memory location previously stored in
the device. After the nonvolatile memory data is loaded into
the wiper register the wiper location will change to the
previously stored wiper position.
At power-down, it is recommended to turn-off first the
signals on R
H
, R
W
and R
L
, followed by V+ and, after that,
V
CC
, in order to avoid unexpected transitions of the wiper
and uncontrolled current overload of the potentiometer.
The end-to-end nominal resistance of the potentiometer
has 128 contact points linearly distributed across the total
resistor. Each of these contact points is addressed by the 7 bit
wiper register which is decoded to select one of these 128
contact points.
Each contact point generates a linear resistive value
between the 0 position and the 127 position. These values
can be determined by dividing the end-to-end value of the
potentiometer by 127. The 10 kW potentiometer has a
resistance of ~79
W
between each wiper position. However
in addition to the ~79
W
for each resistive segment of the
potentiometer, a wiper resistance offset must be considered.
Table 3 shows the effect of this value and how it would
appear on the wiper terminal.
This offset will appear in each of the CAT5133 end-to-end
resistance values in the same way as the 10 kW example.
However resistance between each wiper position for the
50 kW version will be ~395
W
and for the 100 kW version
will be ~790
W.
Table 3. POTENTIOMETER RESISTANCE AND WIPER RESISTANCE OFFSET EFFECTS
Position
0
01
63
127
Typical R
W
to R
L
Resistance for 10 kW
Digital Potentiometer
70
W
or
149
W
or
5,047
W
or
10,070
W
or
0
W
+ 70
W
79
W
+ 70
W
4,977
W
+ 70
W
10,000
W
+ 70
W
Position
00
64
126
127
Typical R
W
to R
H
Resistance for 10 kW
Digital Potentiometer
10,070
W
or
5,047
W
or
149
W
or
70
W
or
10,000
W
+ 70
W
4,977
W
+ 70
W
79
W
+ 70
W
0
W
+ 70
W
Table 4. ABSOLUTE MAXIMUM RATINGS
Parameters
Temperature Under Bias
Storage Temperature
Voltage on any U/D, INC, & CS Pins with Respect to V
CC
(Note 5)
Voltage on R
H
, R
L
, & R
W
Pins with Respect to V
CC
V
CC
with Respect to Ground
V+ with respect to Ground
Wiper Current
Lead Soldering temperature (10 seconds)
Ratings
−55
to +125
−65
to +150
−0.3
to +V
CC
+ 0.3
V+
−0.3
to +6.0
−0.3
to +16.5
6
+300
Units
C
C
V
V
V
V
mA
C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
5. Latch-up protection is provided for stresses up to 100 mA on the digital from
−0.3
V to V
CC
+ 0.3 V.
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CAT5133
Recommended Operating Conditions
V
CC
= +2.7 V to +5.5 V
V+ = +8.0 V to +16.0 V
Operating Temperature Range:
−40C
to +85C
Table 5. POTENTIOMETER CHARACTERISTICS
(Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
R
POT
R
POT
R
POT
R
TOL
I
W
R
W
V
TERM
RES
A
LIN
R
LIN
TC
RPOT
TC
Ratio
C
H
/C
L
/C
W
fc
Parameter
Potentiometer Resistance (10 kW)
Potentiometer Resistance (50 kW)
(Note 12)
Potentiometer Resistance (100 kW)
(Note 12)
Potentiometer Resistance Tolerance
Power Rating
Wiper Current
Wiper Resistance
I
W
= +1 mA @ V+ = 12 V
I
W
= +1 mA @ V+ = 8 V
Voltage on R
W
, R
H
or R
L
Resolution
Absolute Linearity (Note 7)
Relative Linearity (Note 8)
Temperature Coefficient of R
POT
Ratiometric Temperature Coefficient
Potentiometer Capacitances
Frequency Response
V
W(n)(actual)
−
V
W(n)(expected)
(Notes 10, 11)
V
W(n+1)
−
[V
W(n)
+LSB]
(Notes 10, 11)
(Note 6)
(Note 6)
(Note 6)
R
POT
= 50 kW
10/10/25
0.4
300
30
GND = 0 V; V+ = 8 V to 16 V
GND
0.78
1
0.5
70
110
25C
Test Conditions
Min
Typ
10
50
100
20
50
3
150
200
V+
V
%
LSB
(Note 9)
LSB
(Note 9)
ppm/C
ppm/C
pF
MHz
Max
Units
kW
kW
kW
%
mW
mA
W
6. This parameter is tested initially and after a design or process change that affects the parameter.
7. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
8. Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potentiometer.
9. LSB = (R
HM
−
R
LM
)/127; where R
HM
and R
LM
are the highest and lowest measured values on the wiper terminal.
10. n = 1, 2, ..., 127.
11. V
+
@ R
H
; 0 V @ R
L
; V
W
measured @ R
W
, with no load.
12. Contact factory for availability on this version of the CAT5133.
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CAT5133
Table 6. DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7 V to +6.0 V, unless otherwise specified.)
Symbol
I
CC1
I
CC2
I
SB(VCC)
I
SB(V+)
I
LI
I
LO
V
IL
V
IH
V
OL1
Parameter
Power Supply Current
Power supply Current
Nonvolatile WRITE
Standby Current (V
CC
= 5 V)
V+ Standby Current
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage (V
CC
= 3.0 V)
I
OL
= 3 mA
Test Conditions
V
CC
= 5.5 V, f
INC
= 1 MHz, Input = GND
V
CC
= 5.5 V, f
INC
= 1 MHz, Input = GND
V
IN
= GND or V
CC
, INC = VCC
V
CC
= 5 V, V+ = 16 V
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
−1
V
CC
x 0.7
Min
Max
1
3.0
5
10
10
10
V
CC
x 0.3
V
CC
+ 1.0
0.4
Units
mA
mA
mA
mA
mA
mA
V
V
V
Table 7. CAPACITANCE
(T
A
= 25C, f = 1.0 MHz, V
CC
= 5.0 V)
Symbol
C
I/O
C
IN
Parameter
Input/Output Capacitance (SDA)
Input Capacitance (A0, A1, SCL)
Test Conditions
V
I/O
= 0 V (Note 13)
V
IN
= 0 V (Note 13)
Min
Max
8
6
Units
pF
pF
Table 8. POWER UP TIMING
(Notes 13, 14)
Symbol
t
PUR
t
PUW
Power-up to Read Operation
Power-up to Write Operation
Parameter
Min
Max
1
1
Units
ms
ms
Table 9. WIPER TIMING
Symbol
t
WRPO
t
WRL
Parameter
Wiper Response Time After Power Supply Stable
Wiper Response Time After Instruction Issued
Min
5
5
Max
10
10
Units
ms
ms
Table 10. WRITE CYCLE LIMITS
Symbol
t
WR
Write Cycle Time
Parameter
Min
Max
5
Units
ms
Table 11. RELIABILITY CHARACTERISTICS
(Over recommended operating conditions unless otherwise stated.)
Symbol
N
END
(Note 13)
T
DR
(Note 13)
Parameter
Endurance
Data Retention
Reference Test Method
MIL−STD−883, Test Method 1033
MIL−STD−883, Test Method 1008
Min
100,000
100
Max
Units
Cycles/Byte
Years
13. This parameter is tested initially and after a design or process change that affects the parameter.
14. t
PUR
and t
PUW
are the delays required from the time V
CC
is stable until the time the specified operation can be initiated.
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