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N57L5128 Datasheet

32-tap Digital Up/Down Control Potentiometer

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N57L5128
32‐tap Digital Up/Down
Control Potentiometer (POT)
Description
The N57L5128 is a single digital POT 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.
The N57L5128 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 N57L5128 is accomplished with
two input control pins, UP and DOWN. A high-to-low transition on
the UP input 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.
The digital POT can be used as a three-terminal resistive divider or
as a two-terminal variable resistor. Digital potentiometers bring
variability and programmability to a wide variety of applications
including control, parameter adjustments, and signal processing.
Features
32-position Linear Taper Potentiometer
Low Power CMOS Technology
Single Supply Operation: 2.5 V – 5.5 V
Discrete Step-up/Step-down Digital Control
Resistance Values: 10 kW, 50 kW and 100 kW
Available in SOT−23 8-lead Package
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
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
www.onsemi.com
SOT−23
TB SUFFIX
CASE 527AK
PIN CONFIGURATION
UP
DOWN
A
GND
1
(Top View)
VCC
NC
B
W
PIN DESCRIPTIONS
Pin Name
UP
DOWN
Function
Step-Up Control
Step-Down Control
A Potentiometer High Terminal
GND
W
B
NC
Ground
Wiper Terminal
Potentiometer Low Terminal
Not Connected
VCC Supply Voltage
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
© Semiconductor Components Industries, LLC, 2016
August, 2016 − Rev. P0
1
Publication Order Number:
N57L5128/D


  ON Semiconductor Electronic Components Datasheet  

N57L5128 Datasheet

32-tap Digital Up/Down Control Potentiometer

No Preview Available !

N57L5128
Functional Diagrams
VCC
UP
DOWN
UP/DOWN
Control
Power On
Recall
GND
A
W
VCC
B
UP
DOWN
5−BIT
UP/DOWN
COUNTER
GND
31
30
29
28
TRANS−
FER
GATES
2
1
0
A
B
W
A
W
B
Figure 1. General
Figure 2. Detailed
Figure 3. Electronic
Potentiometer
Implementation
Pin Description
UP: Step-Up Control Input
When DOWN input is high, a high-to-low transition on
UP input will cause the wiper to move one increment toward
the A terminal.
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.
W: Wiper Potentiometer Terminal
W is the wiper terminal of the potentiometer. Its position
on the resistor array is controlled by the control inputs, UP
and DOWN. Voltage applied to the W terminal cannot
exceed the supply voltage, VCC or go below ground, GND.
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.
Device Operation
The N57L5128 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 inputs, UP and DOWN. These
inputs control a five-bit up/down counter whose output is
decoded to select the wiper position.
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 transition on UP input will
increment one step the wiper position (RWB will increase
with 1LSB and RWA will decrease with 1LSB).
The wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the last
position. When the N57L5128 is powered-down, the wiper
position is reset. When power is restored, the counter is set
to the mid point, tap 15.
www.onsemi.com
2


Part Number N57L5128
Description 32-tap Digital Up/Down Control Potentiometer
Maker ON Semiconductor
Total Page 7 Pages
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