參數(shù)資料
型號(hào)： CAT5115ZI-00SOIC
元件分類： 數(shù)字電位計(jì)
英文描述： 32-Tap Digitally Programmable Potentiometer
中文描述： 32抽頭數(shù)字可編程電位器
文件頁數(shù)： 2/9頁
文件大?。?/td> 92K
代理商： CAT5115ZI-00SOIC
CAT5115
2
Doc. No. 2117, Rev. E
CS
: Chip Select
The chip select input is used to activate the control input
of the CAT5115 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 CAT5115 operates like a digitally controlled
potentiometer with R
H
and R
L
equivalent to the high
and low terminals and R
W
equivalent to the mechanical
potentiometer's wiper. There are 32 available tap
positions including the resistor end points, R
H
and R
L
.
There are 31 resistor elements connected in series
between the R
H
and R
L
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.
With
CS
set LOW the CAT5115 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 five-
bit counter). The wiper, when at either fixed terminal,
acts like its mechanical equivalent and does not move
beyond the last position. When the CAT5115 is powered-
down, the wiper position is reset. When power is restored,
the counter is set to the mid point, tap 15.
PIN DESCRIPTIONS
INC
: Increment Control Input
The
INC
input moves the wiper in the up or down
direction determined by the condition of the U/
D
input.
U/
D
: Up/Down Control Input
The U/
D
input controls the direction of the wiper
movement. When in a high state and
CS
is low, any high-
to-low transition on
INC
will cause the wiper to move one
increment toward the R
H
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
R
L
terminal.
R
H:
High End Potentiometer Terminal
R
H
is the high end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
greater than the R
L
terminal. Voltage applied to the R
H
terminal cannot exceed the supply voltage, V
CC
or go
below ground, GND.
R
W
: Wiper Potentiometer Terminal
R
W
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 R
W
terminal cannot
exceed the supply voltage, V
CC
or go below ground, GND.
R
L
: Low End Potentiometer Terminal
R
L
is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential
less than the R
H
terminal. Voltage applied to the R
L
terminal cannot exceed the supply voltage, V
CC
or go
below ground, GND. R
L
and R
H
are electrically
interchangeable.
PIN FUNCTIONS
Pin Name
Function
INC
Increment Control
U/
D
Up/Down Control
R
H
Potentiometer High Terminal
GND
Ground
R
W
Potentiometer Wiper Terminal
R
L
Potentiometer Low Terminal
CS
Chip Select
V
CC
Supply Voltage
PIN CONFIGURATION
DIP Package (P, L)
TSSOP Package (U, Y)
MSOP Package (R, Z)
CS
RL
RW
INC
U
/D
RH
V
CC
GND
1
2
3
4
8
7
6
5
INC
U
/D
V
CC
CS
GND
R
H
R
W
R
L
1
2
3
4
8
7
6
5
V
CC
CS
R
R
GND
R
INC
U/
D
W
L
H
1
2
3
4
8
7
6
5
SOIC Package (S, V)
CS
RL
RW
INC
U
/D
RH
V
CC
GND
1
2
3
4
8
7
6
5
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