Datasheet CAT5112S-20TE13, CAT5112S-00TE13, CAT5112RI-50TE13, CAT5112RI-20TE13, CAT5112RI-10TE13 Datasheet (CTLST)

Advance Information

CAT5112

32-Tap Digitally Programmable Potentiometer (DPP™)

FEATURES

■ 32 Position Linear Taper Potentiometer

■ Non-volatile NVRAM Wiper Storage

■ Low Power CMOS Technology

■ Single Supply Operation: 2.5V-6.0V

■ Increment Up/Down Serial Interface

■ Resistance Values: 10K, 20K, 50K and 100K Ω

■ Available in PDIP, SOIC, TSSOP and MSOP packages

DESCRIPTION

The CAT5112 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 CAT5112 contains a 32-tap series resistor array
connected between two terminals RH and RL. An up/
down counter and decoder that are controlled by three
input pins, determines which tap is connected to the
wiper, RW. The CAT5112 wiper is buffered by an OP
AMP that operates rail to rail. The wiper setting, stored
in non-volatile NVRAM memory, is not lost when the
device is powered down and is automatically recalled

APPLICATIONS

■ Automated Product Calibration

■ Remote Control Adjustments

■ Offset, Gain and Zero Control Systems

■ Tamper-Proof Calibrations

■ Contrast, Brightness and Volume Controls

■ Motor Controls and Feedback Systems

■ Programmable Analog Functions

when power is returned. The wiper can be adjusted to
test new system values without effecting the stored
setting. Wiper-control of the CAT5112 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.

FUNCTIONAL DIAGRAM

V

CC

U/D

INC

CS

© 2001 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

Control

and

Memory

V

SS

/

R

V

H

H

R

H

R

/

V

W

+

–

R

WB

R

L

Implementation of the

Electronic Potentiometer

1

W

/

V

R

L

L

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M-1

CAT5112

Advance Information

PIN CONFIGURATION

DIP/SOIC Package

INC

U/D

R

H

GND

V

CS

R
R

CC

L
W

TSSOP Package

CS

V

CC

INC
U/D

MSOP Package

INC

U/D

R

H

GND

R

R
GND

R

V

CC

CS

R

L

R

W

L
W

H

PIN DESCRIPTIONS

INCINC

INC: Increment Control Input

INCINC

The INC input moves the wiper in the up or down direction
determined by the condition of the U/D input.

DD

U/

D: Up/Down Control Input

DD

The U/D input controls the direction of the wiper
movement. When in a high state and CS is low, any high­to-low transition on INC will cause the wiper to move one
increment toward the RH 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
RL terminal.

R

High End Potentiometer Terminal

H:

RH is the high end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
greater than the RL terminal. Voltage applied to the R
terminal cannot exceed the supply voltage, VCC or go
below ground, GND.

RW: Wiper Potentiometer Terminal

RW 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 RW terminal cannot
exceed the supply voltage, V

RL: Low End Potentiometer Terminal

RL is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
less than the RH terminal. Voltage applied to the R
terminal cannot exceed the supply voltage, VCC or go
below ground, GND. RL and RH are electrically
interchangeable.

CSCS

CS: Chip Select

CSCS

The chip select input is used to activate the control input

or go below ground, GND.

CC

PIN FUNCTIONS

Pin Name Function

INC Increment Control
U/D Up/Down Control
R

H

Potentiometer High Terminal
GND Ground
R

W

R

L

Potentiometer Wiper Terminal

Potentiometer Low Terminal
CS Chip Select
V

CC

Supply Voltage

of the CAT5112 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 CAT5112 operates like a digitally controlled
potentiometer with RH and RL equivalent to the high
and low terminals and RW equivalent to the mechanical
potentiometer's wiper. There are 32 available tap posi­tions including the resistor end points, RH and RL. There
are 31 resistor elements connected in series between
the RH 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 five-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

H

CS inputs.
With CS set LOW the CAT5112 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 five­bit 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
CAT5112 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

L

recalled and the counter is set to the value stored.
With INC set low, the CAT5112 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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Advance Information

R

L

C

L

C

H

R

H

C

W

R

W

R

wi

OPERATION MODES

INC CS U/D Operation
High to Low Low High W toward H
High to Low Low Low W toward L
High Low to High X Store Wiper Position
Low Low to High X No Store, Return to Standby
X High X Standby

CAT5112

Potentiometer
Equivalent Circuit

ABSOLUTE MAXIMUM RATINGS

Supply Voltage

VCC to GND ......................................–0.5V to +7V

Inputs

CS to GND .............................–0.5V to V

INC to GND ............................–0.5V to V

U/D to GND ............................–0.5V to V

H to GND ................................–0.5V to V

L to GND ................................–0.5V to V

W to GND ...............................–0.5V to V

RELIABILITY CHARACTERISTICS

CC
CC
CC
CC
CC
CC

+0.5V
+0.5V
+0.5V
+0.5V
+0.5V
+0.5V

Operating Ambient Temperature

Commercial (‘C’ suffix) .................... 0°C to +70°C

Industrial (‘I’ suffix)...................... – 40°C to +85°C

Junction Temperature ..................................... +150°C

Storage Temperature ....................... –65°C to +150°C

Lead Soldering (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 parameters 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.

Symbol Parameter Min Max Units Test Method

(1)

V
I
T
N

ZAP

LTH

DR
END

(1)(2)

ESD Susceptibility 2000 Volts MIL-STD-883, Test Method 3015
Latch-Up 100 mA JEDEC Standard 17
Data Retention 100 Years MIL-STD-883, Test Method 1008
Endurance 1,000,000 Stores MIL-STD-883, Test Method 1003

DC Electrical Characteristics: VCC = +2.5V to +6.0V unless otherwise specified

Power Supply

Symbol Parameter Conditions Min Typ Max Units

V

CC

I

CC1

I

CC2

ISB

(2)

1

Operating Voltage Range 2.5 — 6.0 V
Supply Current (Increment) CAT5114 VCC = 6V, f = 1MHz, IW=0 ——100 µA

V

= 6V, f = 250KHz, IW=0 ——50

CC

Supply Current (Write) Programming, VCC = 6V ——1mA

VCC = 3V ——500 µA

Supply Current (Standby) CAT5114 CS=VCC-0.3V ——1 µA

U/D, INC=VCC-0.3V or GND

Logic Inputs

Symbol Parameter Conditions Min Typ Max Units

I

IH

I

IL

V

IH1

V

IL1

V

IH2

V

IL2

NOTES: (1) This parameter is tested initially and after a design or process change that affects the parameter.

Input Leakage Current VIN = V

CC

——10 µA
Input Leakage Current VIN = 0V ——–10 µA
TTL High Level Input Voltage 4.5V ≤ VCC ≤ 5.5V 2 — V
TTL Low Level Input Voltage 0 — 0.8 V

CMOS High Level Input Voltage 2.5V ≤ VCC ≤ 6V VCC x 0.7 — VCC + 0.3 V
CMOS Low Level Input Voltage -0.3 — VCC x 0.2 V

(2) Latch-up protection is provided for stresses up to 100mA on address and data pins from –1V to V

=source or sink

(3) I

W

(4) These parameters are periodically sampled and are not 100% tested.

CC

+ 1V

3

CC

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V

M-1

CAT5112

Advance Information

Potentiometer Parameters

Symbol Parameter Conditions Min Typ Max Units
R

POT

Potentiometer Resistance 10KΩ

20KΩ
50KΩ
100KΩ

Pot Resistance Tolerance ±15 %
V
V

RH

RL

Voltage on RH pin OV V

Voltage on RL pin OV V

CC
CC

V

V

Resolution 3.2 %
INL Integral Linearity Error IW ≤ 2µA 0.5 1 LSB
DNL Differential Linearity Error IW ≤ 2µA 0.25 .5 LSB
R

Wi

Wiper Resistance VCC = 5V, IW = 1mA 400 Ω

VCC = 2.5V, IW = 1mA 1K Ω
I
TC
TC
R
V

W

RPOT
RATIO

ISO

N

Wiper Current 1 mA
TC of Pot Resistance ppm/oC
Ratiometric TC ppm/oC
Isolation Resistance Ω
Noise nV/√H

z

CH/CL/CW

Potentiometer Capacitances 10/10/25 pF

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Advance Information

AC CONDITIONS OF TEST

VCC Range 2.5V ≤ VCC ≤ 6V

CAT5112

Input Pulse Levels 0.2VCC to 0.7V

CC

Input Rise and Fall Times 10ns
Input Reference Levels 0.5V

CC

AC OPERATING CHARACTERISTICS:

VCC = +2.5V to +6.0V, VH = VCC, VL = 0V, unless otherwise specified

Symbol Parameter

Min Typ

t

CI

t

DI

t

ID

t

IL

t

IH

t

IC

t

CPH

t

CPH

t

IW

t

CYC

t

R, tF

t

PU

tR V
t

WR

(2)

(2)

CC

CS to INC Setup 100 ——ns
U/D to INC Setup 50 ——ns
U/D to INC Hold 100 ——ns

INC LOW Period 250 ——ns
INC HIGH Period 250 ——ns
INC Inactive to CS Inactive 1 ——µs
CS Deselect Time (NO STORE) 100 ——ns
CS Deselect Time (STORE) 10 ——ms
INC to V

Change — 15µs

OUT

INC Cycle Time 1 ——µs
INC Input Rise and Fall Time —— 500 µs

Power-up to Wiper Stable ——1 msec msec

(2)

VCC Power-up Rate 0.2 — 50 V/ms
Store Cycle — 510ms

Limits

(1)

Max Units

A. C. TIMING

CS

t

t

CI

CYC

t

IL

t

IH

t

IC

INC

tID

tDI

U/D

t

IW

W

(1) Typical values are for TA=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.

(store)

t

CPH

90% 90%

t

F

10%

t

R

(3)

MI

5

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CAT5112

ORDERING INFORMATION

Prefix Device # Suffix

Advance Information

CAT

Optional
Company ID

5112

S

Product Number Package

5112: Buffered
5114: Unbuffered

P: PDIP
S: SOIC
U: TSSOP
R:

MSOP

I

-10

Resistance

-10: 10K Ohms

-20: 20K Ohms

-50: 50K Ohms

-00: 100K Ohms

TE13

Tape & Reel

TE13: 2000/Reel

Temperature Range

Blank = Commercial (0°C to +70°C)
I = Industrial (-40°C to +85°C)

Notes:
(1) The device used in the above example is a CAT5112 SI-10TE13 (SOIC, 10K Ohms, Industrial Temperature, Tape & Reel)

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