參數(shù)資料
型號(hào)： CAT5114LI-10-G
元件分類： 數(shù)字電位計(jì)
英文描述： 32-Tap Digitally Programmable Potentiometer (DPP⑩)
中文描述： 32抽頭數(shù)字可編程電位（民進(jìn)黨⑩）
文件頁(yè)數(shù)： 2/15頁(yè)
文件大?。?/td> 307K
代理商： CAT5114LI-10-G
CAT5114
Doc. No. MD-2007 Rev. O
2
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
PIN
CONFIGURATION
PDIP 8-Lead (L), SOIC 8-Lead (V),
MSOP 8-Lead (Z)
INC
1
8
V
CC
U/D
2
7
ˉˉ
R
H
3
6
R
L
GND
4
5
R
WB
CAT
TSSOP 8-Lead (Y)
ˉˉ
1
8
R
L
V
CC
2
7
R
WB
INC
3
6
GND
U/D
4
5
R
H
CAT
TDFN 8-Pad
(ZD7, VP2)
Top View
ˉˉˉ
1
U/D
2
R
H
3
GND
4
8
V
CC
7
ˉˉ
6
R
L
5
R
WB
PIN DESCRIPTIONS
Name Function
Increment Control
U/D
Up/Down Control
R
H
Potentiometer High Terminal
GND
Ground
R
W
Buffered Wiper Terminal
R
L
Potentiometer Low Terminal
ˉˉ
Chip Select
V
CC
Supply Voltage
ˉˉˉ
PIN FUNCTION
INC
ˉˉˉ:
Increment Control Input
The ˉˉˉ 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 ˉˉ is low, any
high-to-low transition on ˉˉˉ will cause the wiper to
move one increment toward the R
H
terminal. When in
a low state and ˉˉ is low, any high-to-low transition
on ˉˉˉ 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, ˉˉˉ, U/D and ˉˉ.
the R
W
terminal cannot exceed the supply voltage,
V
CC
or go below ground, GND.
Voltage applied to
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.
ˉˉ:
Chip Select
The chip select input is used to activate the control
input of the CAT5114 and is active low. When in a
high state, activity on the ˉˉˉ and U/D inputs will not
affect or change the position of the wiper.
DEVICE OPERATION
Th
e CAT5114 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 mecha–
nical 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 RL terminals. The wiper terminal
is connected to one of the 32 taps and controlled by
three inputs, ˉˉˉ, U/D and ˉˉ. These inputs control a
seven-bit up/down counter whose output is decoded
to select the wiper position. The selected wiper
position can be stored in non-volatile memory using
the ˉˉˉ and ˉˉ inputs.
With ˉˉ set LOW the CAT5114 is selected and will
respond to the U/D and ˉˉˉ inputs. HIGH to LOW
transitions on ˉˉˉ wil increment or decrement the wiper
(depending on the state of the U/D input and seven-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 ˉˉ transitions
HIGH while the ˉˉˉ input is also HIGH. When the
CAT5114 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.
With ˉˉˉ set low, the CAT5114 may be de-selected
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 non
-
volatile memory.
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