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CAT5128 Datasheet(PDF) 2 Page - ON Semiconductor

No. de pieza CAT5128
Descripción Electrónicos  32?릘ap Digital Up/Down Control Potentiometer (POT)
Download  7 Pages
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT5128 Datasheet(HTML) 2 Page - ON Semiconductor

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CAT5128
http://onsemi.com
2
Functional Diagrams
Figure 1. General
A
B
UP/DOWN
Control
Power On
A
B
GND
W
W
31
30
29
28
2
1
0
TRANS−
GATES
5−BIT
UP/DOWN
COUNTER
GND
A
W
B
Figure 2. Detailed
Figure 3. Electronic
Potentiometer
Implementation
Recall
DOWN
VCC
UP
DOWN
UP
VCC
FER
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 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 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 CAT5128 is powered-down, the wiper
position is reset. When power is restored, the counter is set
to the mid point, tap 15.


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