CAT5112
32-Tap Digitally Programmable Potentiometer (DPP™)
with Buffered Wiper
FEATURES
DESCRIPTION
32-position linear taper potentiometer
The CAT5112 is a single digitally programmable
potentiometer (DPP™) designed as a electronic
replacement for mechanical potentiometers. 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.
Non-volatile EEPROM wiper storage;
buffered wiper
Low power CMOS technology
Single supply operation: 2.5V - 6.0V
Increment up/down serial interface
Resistance values: 10kΩ, 50kΩ and 100kΩ
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, RWB. The CAT5112 wiper is buffered by an
op amp that operates rail to rail. The wiper setting,
stored in non-volatile memory, is not lost when the
device is powered down and is automatically recalled
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 accompli¯¯ , U/D
¯ , and INC
¯¯¯.
shed with three input control pins, CS
¯¯¯
The INC input increments the wiper in the direction
¯ input.
which is determined by the logic state of the U/D
¯¯
The CS input is used to select the device and also
store the wiper position prior to power down.
Available in PDIP, SOIC, TSSOP and MSOP
packages
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
The digitally programmable potentiometer can be
used as a buffered voltage divider. For applications
where the potentiometer is used as a 2-terminal
variable resistor, please refer to the CAT5114. The
buffered wiper of the CAT5112 is not compatible with
that application.
For Ordering Information details, see page 10.
FUNCTIONAL DIAGRAM
RH
VCC
RH
U/D
INC
Control
and
Memory
CS
Power On Recall
+
+
RWB
–
–
RWB
RL
RL
GND
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
Electronic Potentiometer Implementation
1
Doc. No. MD-2002 Rev. N
CAT5112
PIN CONFIGURATION
PDIP 8-Lead (L)
SOIC 8 Lead (V)
MSOP 8 Lead (Z)
PIN DESCRIPTIONS
Name Function
TSSOP 8 Lead (Y)
¯¯¯ 1
INC
8 VCC
¯¯ 1
CS
8 RL
¯ 2
U/D
¯¯
7 CS
VCC 2
7 RWB
6 RL
¯¯¯ 3
INC
5 RWB
¯ 4
U/D
RH 3
CAT
GND 4
CAT
¯¯¯
INC
¯
U/D
Increment Control
RH
Potentiometer High Terminal
Up/Down Control
GND Ground
6 GND
RWB
5 RH
Buffered Wiper Terminal
RL
Potentiometer Low Terminal
¯¯
CS
Chip Select
VCC
Supply Voltage
PIN DESCRIPTION
¯¯¯ and U/D
¯ inputs will not
high state, activity on the INC
affect or change the position of the wiper.
¯¯¯ : Increment Control Input
INC
¯¯¯ input (on the falling edge) moves the wiper in
The INC
the up or down direction determined by the condition
¯ input.
of the U/D
DEVICE OPERATION
The CAT5112 operates like a digitally controlled
potentiometer with RH and RL equivalent to the high
and low terminals and RWB equivalent to the mecha–
nical 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
¯¯¯, U/D
¯ and CS
¯¯ . These inputs control a
three inputs, INC
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
¯¯ inputs.
and CS
¯ : Up/Down Control Input
U/D
¯ input controls the direction of the wiper
The U/D
¯¯ is low, any
movement. When in a high state and CS
¯¯¯ will cause the wiper to
high-to-low transition on INC
move one increment toward the RH terminal. When in
¯¯ is low, any high-to-low transition
a low state and CS
¯¯¯ will cause the wiper to move one increment
on INC
towards the RL terminal.
RH: High End Potentiometer Terminal
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 RH terminal cannot exceed the supply voltage,
VCC or go below ground, GND.
¯¯ set LOW the CAT5112 is selected and will
With CS
¯ and INC
¯¯¯ inputs. HIGH to LOW
respond to the U/D
¯¯¯ wil increment or decrement the
transitions on INC
¯ input and
wiper (depending on the state of the U/D
five-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
¯¯¯ input is also HIGH.
transitions HIGH while the INC
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 recalled and the counter is set to the
value stored.
RWB: Wiper Potentiometer Terminal (Buffered)
RWB is the buffered wiper terminal of the potentio–
meter. Its position on the resistor array is controlled by
¯¯¯, U/D
¯ and CS
¯¯ .
the control inputs, INC
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 RL terminal cannot exceed the supply voltage, VCC
or go below ground, GND. RL and RH are electrically
interchangeable.
¯¯¯ set low, the CAT5112 may be deselected
With INC
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.
¯¯ : Chip Select
CS
The chip select input is used to activate the control
input of the CAT5112 and is active low. When in a
Doc. No. MD-2002 Rev. N
2
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5112
OPERATION MODES
RH
¯¯¯
INC
¯¯
CS
¯
U/D
Operation
High to Low
Low
High
Wiper toward RH
High to Low
Low
Low
Wiper toward RL
High
Low to High
X
Store Wiper Position
Low
Low to High
X
No Store, Return to Standby
X
High
X
Standby
CH
RWI
RWB
CW
CL
Potentiometer
Equivalent Circuit
RL
ABSOLUTE MAXIMUM RATINGS(1)
Parameters
Supply Voltage
VCC to GND
Inputs
¯¯ to GND
CS
¯¯¯ to GND
INC
¯ to GND
U/D
RH to GND
RL to GND
RWB to GND
Ratings
Units
-0.5 to +7V
V
-0.5 to VCC +0.5
-0.5 to VCC +0.5
-0.5 to VCC +0.5
-0.5 to VCC +0.5
-0.5 to VCC +0.5
-0.5 to VCC +0.5
V
V
V
V
V
V
Parameters
Operating Ambient Temperature
Commercial (‘C’ or Blank suffix)
Industrial (‘I’ suffix)
Junction Temperature
Storage Temperature
Lead Soldering (10s max)
Ratings
Units
0 to 70
-40 to +85
+150
-65 to 150
+300
ºC
ºC
ºC
ºC
ºC
Max
Units
RELIABILITY CHARACTERISTICS
Symbol
Parameter
Test Method
Min
VZAP(2)
ILTH(2) (3)
Typ
ESD Susceptibility
MIL-STD-883, Test Method 3015
2000
V
Latch-Up
JEDEC Standard 17
100
mA
TDR
Data Retention
MIL-STD-883, Test Method 1008
100
Years
NEND
Endurance
MIL-STD-883, Test Method 1003
1,000,000
Stores
DC ELECTRICAL CHARACTERISTICS
VCC = +2.5V to +6V unless otherwise specified
Power Supply
Symbol
Parameter
VCC
Operating Voltage Range
ICC1
Supply Current (Increment)
ICC2
Supply Current (Write)
ISB1(3)
Supply Current (Standby)
Conditions
Min
Typ
Max
Units
2.5
–
6
V
VCC = 6V, f = 1MHz, IW = 0
–
–
200
µA
VCC = 6V, f = 250kHz, IW = 0
–
–
100
µA
Programming, VCC = 6V
–
–
1000
µA
VCC = 3V
¯¯ = VCC - 0.3V
CS
¯ , INC
¯¯¯ = VCC - 0.3V or GND
U/D
–
–
500
µA
–
75
150
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 VCC + 1V
(4)
IW = source or sink
(5)
These parameters are periodically sampled and are not 100% tested.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-2002 Rev. N
CAT5112
Logic Inputs
Symbol
Parameter
Conditions
IIH
Input Leakage Current
VIN = VCC
–
–
10
µA
IIL
Input Leakage Current
VIN = 0V
–
–
-10
µA
2
–
VCC
V
0
–
0.8
V
VCC x 0.7
–
VCC + 0.3
V
-0.3
–
VCC x 0.2
V
VIH1
TTL High Level Input Voltage
VIL1
TTL Low Level Input Voltage
VIH2
CMOS High Level Input Voltage
VIL2
CMOS Low Level Input Voltage
4.5V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 6V
Min
Typ
Max
Units
Potentiometer Characteristics
Symbol
RPOT
Parameter
Potentiometer Resistance
Conditions
Min
Typ
-10 Device
10
-50 Device
50
-00 Device
100
Pot. Resistance Tolerance
Max
Units
kΩ
±20
%
VRH
Voltage on RH pin
0
VCC
V
VRL
Voltage on RL pin
0
VCC
V
Resolution
1
%
INL
Integral Linearity Error
IW ≤ 2µA
0.5
1
LSB
DNL
Differential Linearity Error
IW ≤ 2µA
0.25
0.5
LSB
ROUT
Buffer Output Resistance
0.05VCC ≤ VWB ≤ 0.95VCC,
VCC = 5V
1
Ω
IOUT
Buffer Output Current
0.05VCC ≤ VWB ≤ 0.95VCC,
VCC = 5V
3
mA
TCRPOT
TC of Pot Resistance
300
ppm/ºC
TCRATIO
Ratiometric TC
20
ppm/ºC
8/8/25
pF
1.7
MHz
CRH/CRL/CRW
Potentiometer Capacitances
fc
Frequency Response
Passive Attenuator, 10kΩ
VWB(SWING)
Output Voltage Range
IOUT ≤ 100µA, VCC = 5V
Doc. No. MD-2002 Rev. N
4
0.01VCC
0.99VCC
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5112
AC CONDITIONS OF TEST
VCC Range
2.5V ≤ VCC ≤ 6V
Input Pulse Levels
0.2VCC to 0.7VCC
Input Rise and Fall Times
10ns
Input Reference Levels
0.5VCC
AC OPERATING CHARACTERISTICS
VCC = +2.5V to +6.0V, VH = VCC, VL = 0V, unless otherwise specified
Symbol
tCI
tDI
tID
tIL
tIH
tIC
tCPH
tCPH
tIW
tCYC
(2)
tR, tF
tPU
(2)
tWR
Parameter
Min
Typ(1)
Max
Units
¯¯ to INC
¯¯¯ Setup
CS
¯ to INC
¯¯¯ Setup
U/D
100
–
–
ns
50
–
–
ns
¯ to INC
¯¯¯ Hold
U/D
¯¯¯ LOW Period
INC
100
–
–
ns
250
–
–
ns
¯¯¯ HIGH Period
INC
¯¯¯ Inactive to CS
¯¯ Inactive
INC
250
–
–
ns
1
–
–
µs
¯¯ Deselect Time (NO STORE)
CS
¯¯ Deselect Time (STORE)
CS
100
–
–
ns
10
–
–
ms
¯¯¯ to VOUT Change
INC
¯¯¯ Cycle Time
INC
–
1
5
µs
1
–
–
µs
¯¯¯ Input Rise and Fall Time
INC
–
–
500
µs
Power-up to Wiper Stable
–
–
1
ms
Store Cycle
–
5
10
ms
A.C. TIMING
CS
tCI
tIL
tCYC
tIC
tIH
(store)
tCPH
90%
INC
90%
10%
tDI
tID
tF
U /D
tIW
tR
MI(3)
RWB
Notes:
(1)
(2)
(3)
Typical values are for TA = 25ºC and nominal supply voltage.
This parameter is periodically sampled and not 100% tested.
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.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-2002 Rev. N
CAT5112
PACKAGE OUTLINE DRAWINGS
PDIP 8-Lead 300mil (L) (1)(2)
SYMBOL
MIN
NOM
A
E1
5.33
A1
0.38
A2
2.92
3.30
4.95
b
0.36
0.46
0.56
b2
1.14
1.52
1.78
c
0.20
0.25
0.36
D
9.02
9.27
10.16
E
7.62
7.87
8.25
e
PIN # 1
IDENTIFICATION
MAX
2.54 BSC
E1
6.10
eB
7.87
L
2.92
6.35
7.11
10.92
3.30
3.80
D
TOP VIEW
E
A2
A
A1
c
b2
L
e
eB
b
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC Specification MS-001.
Doc. No. MD-2002 Rev. N
6
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5112
SOIC 8-LEAD Narrow Body (150mil) (V) (1)(2)
SYMBOL
E1
E
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
b
0.33
0.51
c
0.19
0.25
D
4.80
5.00
E
5.80
6.20
E1
3.80
e
PIN # 1
IDENTIFICATION
NOM
4.00
1.27 BSC
h
0.25
0.50
L
0.40
1.27
θ
0º
8º
TOP VIEW
D
h
A1
θ
A
c
e
b
L
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC Specification MS-012.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-2002 Rev. N
CAT5112
TSSOP 8-Lead (Y) (1)(2)
b
SYMBOL
MIN
NOM
A
E1
E
MAX
1.20
A1
0.05
A2
0.80
b
0.19
c
0.09
D
2.90
0.15
0.90
1.05
0.30
0.20
3.00
3.10
E
6.30
6.40
6.50
E1
4.30
4.40
4.50
e
0.65 BSC
L
1.00 REF
L1
0.50
θ1
0°
0.60
0.75
8°
e
TOP VIEW
D
A2
A1
A
c
θ1
L1
L
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC Standard MO-153
Doc. No. MD-2002 Rev. N
8
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5112
MSOP 8-Lead (Z) (1)(2)
SYMBOL
MIN
NOM
MAX
A1
0.05
0.10
A2
0.75
0.85
b
0.22
0.38
c
0.13
0.23
D
2.90
3.00
3.10
E
4.80
4.90
5.00
E1
2.90
3.00
3.10
A
E
E1
1.10
e
L
0.15
0.95
0.65 BSC
0.40
0.60
0.80
L1
0.95 REF
L2
0.25 BSC
θ
0º
6º
TOP VIEW
D
A
A2
A1
DETAIL A
e
b
c
SIDE VIEW
END VIEW
θ
L2
L
L1
DETAIL A
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC Specification MS-187.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Doc. No. MD-2002 Rev. N
CAT5112
EXAMPLE OF ORDERING INFORMATION (1)
Prefix
CAT
Device #
Suffix
5112
V
Optional
Company ID
I
-10
Temperature Range
I = Industrial (-40ºC to 85ºC)
Product Number
5112
Resistance
-10: 10k ohms
-50: 50k ohms
-00: 100k ohms
Package
L: PDIP
V: SOIC
Y: TSSOP
Z: MSOP
–
G(4)
T3
Tape & Reel
T: Tape & Reel
3: 3000/Reel
Lead Finish
Blank: Matte-Tin
G: NiPdAu
ORDERING
PART NUMBER
CAT5112LI-10-G
CAT5112LI-50-G
CAT5112LI-00-G
CAT5112VI-10-G
CAT5112VI-50-G
CAT5112VI-00-G
CAT5112YI-10-G
CAT5112YI-50-G
CAT5112YI-00-G
CAT5112ZI-10-G
CAT5112ZI-50-G
CAT5112ZI-00-G
For current Tape and Reel information,
download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is NiPdAu.
(3) This device used in the above example is a CAT5112VI-10-GT3 (SOIC, Industrial Temperature, 10kΩ, NiPdAu, Tape & Reel).
(4) For Matte-Tin finish, contact factory.
Doc. No. MD-2002 Rev. N
10
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5112
REVISION HISTORY
Date
10-Mar-07
29-Mar-04
12-Apr-04
Rev.
J
K
L
04-Jun-07
M
20-Nov-08
N
Description
Updated Potentiometer Parameters
Change Green Package marking for SOIC from W to V
Update Reel Ordering Information
Add Package Outline Drawings
Update Example of Ordering Information
Add MD- to the Document Number
Update Package Outline Drawings
Change logo and fine print to ON Semiconductor
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to
any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer
purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and
distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated
with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
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Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada
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Email: orderlit@onsemi.com
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
N. American Technical Support: 800-282-9855 Toll Free
USA/Canada
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11
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For additional information, please contact your local
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Doc. No. MD-2002 Rev. N
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