Catalyst CAT5128TBI-00 32-tap digital up/down control potentiometer Datasheet

CAT5128
32-Tap Digital Up/Down Control Potentiometer
FEATURES
DESCRIPTION
„ 32-position linear taper potentiometer
The CAT5128 is a single digitally programmable
potentiometer (DPP™) designed as an 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.
„ Low power CMOS technology
„ Single supply operation: 2.5V – 5.5V
„ Discrete step-up/step-down digital control
„ Resistance values: 10kΩ, 50kΩ and 100kΩ
„ Available in SOT-23 8-lead Pb-free package
APPLICATIONS
The CAT5128 contains a 32-tap series resistor array
connected between two terminals A and B. An
up/down counter and decoder that are controlled by
two input pins, determines which tap is connected to
the wiper, W. Wiper-control of the CAT5128 is
¯¯ and
accomplished with two input control pins, UP
¯¯¯¯¯¯
¯¯ input
DOWN . A high-to-low transition on the UP
increments the wiper position and a high-to-low
transition on the ¯¯¯¯¯¯
DOWN input decrements the wiper
position. The tap position is not stored in memory.
The wiper is always set to the mid point, tap 15 at
power up.
„ 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 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.
For Ordering Information details, see page 7.
FUNCTIONAL DIAGRAM
VCC
29
VCC
UP/DOWN
Control
W
ONE 28
OF
THIRTY TWO
DECODER
UP
CONTROL
CIRCUITRY
DOWN
Power On Recall
GND
B
TRANSFER
GATES
RESISTOR
ARRAY
W
2
DOWN
1
GND
0
General
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
A
30
A
UP
A
31
5-BIT
UP/DOWN
COUNTER
Detailed
1
B
W
B
Electronic Potentiometer
Implementation
Doc. No. MD-2128 Rev. A
CAT5128
PIN DESCRIPTIONS
PIN CONFIGURATION
SOT-23 8-Lead
¯¯
UP
1
¯¯¯¯¯¯
DOWN
2
A
3
GND
4
CAT
Name Function
¯¯
Step-Up Control
UP
¯¯¯¯¯¯
DOWN Step-Down Control
8
VCC
7
NC
6
B
A
5
W
GND
Potentiometer High Terminal
Ground
W
Wiper Terminal
B
Potentiometer Low Terminal
NC
Not Connected
VCC
Supply Voltage
PIN DESCRIPTION
DEVICE OPERATION
¯¯ : Step-Up Control Input
UP
When ¯¯¯¯¯¯
DOWN input is high, a high-to-low transition on
¯¯ input will cause the wiper to move one increment
UP
toward the A terminal.
The CAT5128 operates like a digitally controlled
potentiometer with A and B equivalent to the high and
low terminals and W equivalent to the mechanical
potentiometer's wiper. There are 32 available tap
positions including the resistor end points, A and B.
There are 31 resistor elements connected in series
between the A and B terminals. The wiper terminal is
connected to one of the 32 taps and controlled by two
¯¯ and ¯¯¯¯¯¯
inputs, UP
DOWN . These inputs control a five-bit
up/down counter whose output is decoded to select
the wiper position.
¯¯¯¯¯¯
DOWN : Step-Down Control Input
A high-to-low transition on ¯¯¯¯¯¯
DOWN input will cause the
wiper to move one increment towards the B terminal.
A: High End Potentiometer Terminal
A is the high end terminal of the potentiometer. It is
not required that this terminal be connected to a
potential greater than the B terminal. Voltage applied
to the A terminal cannot exceed the supply voltage,
VCC or go below ground, GND.
A high-to-low transition on ¯¯¯¯¯¯
DOWN input will
decrement one step the wiper position (RWB will
decrease with 1LSB and RWA will increase with 1LSB).
If and only if ¯¯¯¯¯¯
DOWN input is high, a high-to-low
¯¯ input will increment one step the
transition on UP
wiper position (RWB will increase with 1LSB and RWA
will decrease with 1LSB).
W: Wiper Potentiometer Terminal
W is the wiper terminal of the potentiometer. Its
position on the resistor array is controlled by the
¯¯ and ¯¯¯¯¯¯
control inputs, UP
DOWN . Voltage applied to the
W terminal cannot exceed the supply voltage, VCC or
go below ground, GND.
The wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the
last position. When the CAT5128 is powered-down,
the wiper position is reset. When power is restored,
the counter is set to the mid point, tap 15.
B: Low End Potentiometer Terminal
B is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
less than the A terminal. Voltage applied to the B
terminal cannot exceed the supply voltage, VCC or go
below ground, GND. B and A are electrically
interchangeable.
Doc. No. MD-2128 Rev. A
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5128
OPERATION MODES
A
¯¯
UP
High to Low
¯¯¯¯¯¯
DOWN
Operation
High
Wiper toward A – RW Increment
X
Low
Wiper does not change
High
High to Low
Wiper toward B – RW Decrement
High to Low
High to Low
Wiper toward B – RW Decrement
Low
X
Wiper does not change
High
High
Wiper does not change
CA
RA
RW
W
CW
RB
CB
B
Potentiometer
Equivalent Circuit
ABSOLUTE MAXIMUM RATINGS (1)
Parameters
Ratings
Units
-0.5 to +7V
V
¯¯ to GND
UP
¯¯¯¯¯¯
DOWN to GND
-0.5 to VCC +0.5
V
-0.5 to VCC +0.5
V
A, B, W to GND
-0.5 to VCC +0.5
V
-40 to +85
ºC
Junction Temperature
+150
ºC
Storage Temperature
-65 to 150
ºC
Lead Soldering (10 seconds max)
+300
ºC
Thermal Resistance θJA
230
ºC/W
Supply Voltage
VCC to GND
Inputs
Operating Ambient Temperature
Industrial (‘I’ suffix)
DC ELECTRICAL CHARACTERISTICS (1)
VCC = +2.5V to +5.5V unless otherwise specified
Power Supply
Symbol
VCC
ICC1
ISB1(3)
Parameter
Conditions
Min
Operating Voltage Range
Supply Current (Increment)
Supply Current (Standby)
Typ
Max
Units
2.5
–
5.5
V
VCC = 5.5V, f = 1MHz, IW = 0
–
–
100
µA
VCC = 5.5V, f = 250kHz, IW = 0
–
–
50
µA
¯¯ , ¯¯¯¯¯¯
UP
DOWN = VCC or GND
–
0.01
1
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.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-2128 Rev. A
CAT5128
LOGIC INPUTS
VCC = +2.5V to +5.5V unless otherwise specified
Symbol
Parameter
Conditions
IIH
Input Leakage Current
IIL
Input Leakage Current
VIH1
TTL High Level Input Voltage
VIL1
TTL Low Level Input Voltage
VIH2
CMOS High Level Input Voltage
VIL2
CMOS Low Level Input Voltage
Min
Typ
Max
Units
VIN = VCC
–
–
10
µA
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
4.5V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
POTENTIOMETER CHARACTERISTICS
VCC = +2.5V to +5.5V unless otherwise specified
Symbol
RPOT
Parameter
Potentiometer Resistance
Conditions
Min
(1)
-10 Device
Typ
10
-50 Device
50
-00 Device
100
Pot. Resistance Tolerance
Max
Units
kΩ
±20
%
VA
Voltage on A pin
0
VCC
V
VB
Voltage on B pin
0
VCC
V
INL
Integral Linearity Error
IW ≤ 2µA
-0.5
0.1
0.5
LSB
DNL
Differential Linearity Error
IW ≤ 2µA
-0.5
0.05
0.5
LSB
RWI
Wiper Resistance
Resolution
IW
3.2
VCC = 5V, IW = 1mA
70
VCC = 2.5V, IW = 1mA
150
Wiper Current
(2)
TCRPOT
TC of Pot Resistance
(3)
50
TCRATIO
Ratiometric TC
(3)
5
Noise
100kHz / 1kHz
Potentiometer Capacitances
(3)
Frequency Response
Passive Attenuator, 10kΩ
VN
(3)
CA/CB/CW
B
fc (3)
%
Ω
300
Ω
1
mA
ppm/ºC
20
ppm/ºC
8/24
nV/√Hz
8/8/25
pF
1.7
MHz
Notes:
(1) Typical values are for TA = 25ºC and nominal supply voltage.
(2) IW = source or sink.
(3) These parameters are periodically sampled and are not production tested.
Doc. No. MD-2128 Rev. A
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5128
AC CONDITIONS OF TEST
VCC Range
2.5V ≤ VCC ≤ 5.5V
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 +5.5V, VH = VCC, VL = 0V, unless othewise specified
Symbol
tUP
tDOWN
tUP_CYC
tDOWN_CYC
tUP_R, tUP_F
(2)
tDOWN_R, tDOWN_F
(2)
tDOWN_SET
tPU
Min
¯¯ LOW Period
UP
¯¯¯¯¯¯
DOWN LOW Period
500
–
–
ns
500
–
–
ns
¯¯ Cycle Time
UP
¯¯¯¯¯¯
DOWN Cycle Time
1
–
–
µs
1
–
–
µs
–
–
500
ns
–
–
500
ns
200
–
–
ns
200
–
–
ns
–
–
1
ms
¯¯ Rise and Fall Time
UP
¯¯¯¯¯¯
DOWN Rise and Fall Time
¯¯ Settling Time
UP
¯¯¯¯¯¯
DOWN Settling Time
tUP_SET
(2)
(1)
Parameter
Power-up to Wiper Stable
Typ
Max
Units
INTERFACE TIMING DIAGRAM
tUP_CYC
tUP_R
tUP
tUP_F
90%
UP
10%
90%
10%
MI(3)
tUP_SET
RW
Increment RW in Discrete Steps
tDOWN_CYC
tDOWN
tDOWN_R
DOWN
tDOWN_F
90%
10%
90%
10%
tDOWN_SET
MI(3)
RW
Decrement RW in Discrete Steps
Notes:
(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.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-2128 Rev. A
CAT5128
PACKAGE OUTLINE DRAWING
SOT-23 8-Lead (TB)
(1)(2)
E1
e
E
b
SYMBOL
MIN
A
0.90
1.45
A1
0.00
0.15
0.90
A3
0.60
0.80
b
0.28
0.38
c
0.08
0.22
1.10
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
L
TOP VIEW
MAX
A2
e
PIN #1 IDENTIFICATION
NOM
0.65 BSC
0.30
L1
0.45
0.60
0.60 REF
L2
θ
1.30
0.25 REF
0º
8º
D
A
A3
A2
c
θ
L1
A1
SIDE VIEW
L
L2
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-178.
Doc. No. MD-2128 Rev. A
6
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5128
EXAMPLE OF ORDERING INFORMATION
Prefix
Device #
CAT
(1)
Suffix
5128
TB
Optional
Company ID
I
-10
–
Temperature Range
I = Industrial (-40ºC to 85ºC)
Product Number
5128
Resistance
-10: 10kΩ
-50: 50kΩ
-00: 100kΩ
Package
TB: SOT-23
G
T3
Tape & Reel
T: Tape & Reel
3: 3,000/Reel
Lead Finish
G:NiPdAu
ORDERING PART NUMBER
Resistance
CAT5128TBI-10
10kΩ
CAT5128TBI-50
50kΩ
CAT5128TBI-00
(5)
Package
SOT-23-8
100kΩ
For Product Top Mark Codes, click here:
http://www.catsemi.com/techsupport/producttopmark.asp
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 CAT5128TBI-10-GT3 (SOT-23, Industrial Temperature, 10kΩ, NiPdAu, Tape & Reel,
3,000/Reel) .
(4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
(5) Contact factory for availability.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. MD-2128 Rev. A
REVISION HISTORY
Date
03/19/08
Rev.
A
Reason
Initial Release
Copyrights, Trademarks and Patents
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Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
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Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled
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Corporate Headquarters
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Santa Clara, CA 95054
Phone: 408.542.1000
Fax:
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Document No: MD-2128
Revision:
A
Issue date:
03/19/08
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