CAT5133
16 Volt Digitally Programmable Potentiometer (DPP
TM
)
with 128 Taps and an Increment Decrement Interface
FEATURES
Single linear DPP with 128 taps
End-to-end resistance of 10kΩ, 50kΩ or 100kΩ
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
): 2.7V to 5.5V
Analog Supply range (V+): +8V to +16V
Low Standby Current: 15μA
100 Year wiper setting memory
Industrial Temperature range: -40ºC to +85ºC
RoHS-compliant 10-pin MSOP package
DESCRIPTION
The CAT5133 is a high voltage Digital Programmable
Potentiometer (DPP) integrated with E2PROM
memory and control logic to operate in a similar
manner to a mechanical potentiometer. The DPP
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 DPP. 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.
APPLICATION
LCD screen Adjustment
Volume Control
Mechanical potentiometer replacement
Gain adjustment
Line impedance matching
VCOM settings adjustment
For Ordering Information details, see page 9.
BLOCK DIAGRAM
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-2125 Rev. C
CAT5133
PIN CONFIGURATION
MSOP Package (GZ)
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 (2.7V to 5.5V)
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 (+8.0V to +16.0V)
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 ¯¯¯. These inputs control a
¯¯¯, ¯
CS
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 ¯¯¯ set LOW the CAT5133 is selected and will
CS
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 ¯¯¯ transitions
CS
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.
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
Doc. No. MD-2125 Rev. C
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5133
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 DPP 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 potentio-
meter 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 10kΩ
potentiometer has a resistance of ~79Ω
between each
wiper position. However in addition to the ~79Ω
for
each resistive segment of the potentiometer, a wiper
resistance offset must be considered. Table 8 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 10kΩ
example. However resistance between each wiper
position for the 50kΩ version will be ~395Ω and for
the100kΩ version will be ~790Ω.
Potentiometer Resistance and Wiper Resistance Offset Effects
Position
0
01
63
127
Typical R
W
to R
L
Resistance
for 10kΩ DPP
70Ω or
149Ω or
5,047Ω or
10,070Ω or
0Ω + 70Ω
79Ω + 70Ω
4,977Ω + 70Ω
10,000Ω + 70Ω
Position
00
64
126
127
Typical R
W
to R
H
Resistance
for 10kΩ DPP
10,070Ω or
5,047Ω or
149Ω or
70Ω or
10,000Ω + 70Ω
4,977Ω + 70Ω
79Ω + 70Ω
0Ω + 70Ω
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
Temperature Under Bias
Storage Temperature
Voltage on any U/D, INC ¯¯¯ Pins with Respect to V
CC(2)
¯ ¯¯¯,& CS
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
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)
Latch-up protection is provided for stresses up to 100mA on the digital from -0.3V to V
CC
+0.3V.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-2125 Rev. C
CAT5133
RECOMMENDED OPERATING CONDITIONS
V
CC
V+
= +2.7V to +5.5V
= +8.0V to +16.0V
Operating Temperature Range: -40°C to +85°C
POTENTIOMETER CHARACTERISTICS
(Over recommended operating conditions unless otherwise stated.)
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
fc
Notes:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
This parameter is tested initially and after a design or process change that affects the parameter.
Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a
potentiometer.
LSB = (R
HM
- R
LM
)/127; where R
HM
and R
LM
are the highest and lowest measured values on the wiper terminal.
n = 1, 2, ..., 127.
+
V @ R
H
; 0V @ R
L
; V
W
measured @ R
W
, with no load.
Contact factory for availability on this version of the CAT5133.
Parameter
Test Conditions
Potentiometer Resistance (10kΩ)
Potentiometer Resistance (50kΩ)
(7)
Potentiometer Resistance (100kΩ)
(7)
Potentiometer Resistance Tolerance
Power Rating
Wiper Current
Wiper Resistance
Voltage on R
W
, R
H
or R
L
25ºC
I
W
= +1mA @ V+ = 12V
I
W
= +1mA @ V+ = 8V
GND = 0V; V+ = 8V to 16V
Min
Limits
Typ
10
50
100
Max
Units
kΩ
kΩ
kΩ
%
mW
mA
Ω
Ω
V
%
LSB
(4)
LSB
(4)
ppm/°C
ppm/°C
pF
MHz
±20
50
±3
150
200
V+
70
110
GND
0.78
Resolution
Absolute Linearity
(2)
V
W(n)(actual)
- V
W(n)(expected)(5), (6)
Relative Linearity
(3)
V
W(n+1)
- [V
W(n)
+LSB]
(5), (6)
(1)
Temperature Coefficient of R
POT
Ratiometric Temperature Coefficient
(1)
(1)
Potentiometer Capacitances
Frequency Response
R
POT
= 50kΩ
±1
±0.5
±300
30
10/10/25
0.4
Doc. No. MD-2125 Rev. C
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5133
DC ELECTRICAL CHARACTERISTICS
V
CC
= +2.7V to +6.0V, 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
= 5V)
V+ Standby Current
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage (V
CC
= 3.0V)
Test Conditions
V
CC
= 5.5V, f
INC
= 1MHz, Input = GND
V
CC
= 5.5V, f
INC
= 1MHz, Input = GND
V
IN
= GND or V
CC
, INC = VCC
V
CC
= 5V, V+ = 16V
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
Min
Max
1
3.0
Units
mA
mA
µA
µA
µA
µA
V
V
V
I
OL
= 3 mA
5
10
10
10
-1
V
CC
x 0.3
V
CC
x 0.7 V
CC
+ 1.0
0.4
CAPACITANCE
T
A
= 25ºC, f = 1.0MHz, V
CC
= 5.0V
Symbol
C
I/O
C
IN
Parameter
Input/Output Capacitance (SDA)
Input Capacitance (A0, A1, SCL)
Test Conditions
V
I/O
= 0V
(1)
V
IN
= 0V
(1)
Min
Max
8
6
Units
pF
pF
POWER UP TIMING
(1)(2)
Symbol
t
PUR
t
PUW
Parameter
Power-up to Read Operation
Power-up to Write Operation
Min
Max
1
1
Units
ms
ms
XDCP 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
μs
μs
WRITE CYCLE LIMITS
Symbol
t
WR
Notes:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) t
PUR
and t
PUW
are the delays required from the time V
CC
is stable until the specified operation can be initiated.
Parameter
Write Cycle Time
Min
Max
5
Units
ms
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-2125 Rev. C
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