CAT5127, CAT5129
PIN CONFIGURATION
MSOP/TDFN
CAT5127
¯¯¯
INC
¯
U/D
R
H
GND
1
2
3
4
8 V
CC
¯¯
7 CS
6 R
L
5 NC
PIN DESCRIPTIONS
Name Function
¯¯¯
INC
¯
U/D
R
H
Increment Control
Up/Down Control
Potentiometer High
Terminal
No Connect
Potentiometer Low
Terminal
Chip Select
Supply Voltage
CAT5127 CAT5129
MSOP/TDFN SOT23
1
2
3
4
5
6
7
8
4
3
5
2
-
-
1
6
GND Ground
TSOT23-6
CAT5129
¯¯
CS
GND
¯
U/D
1
2
3
6 V
CC
5 R
H
¯¯¯
4 INC
NC
R
L
¯¯
CS
V
CC
DEVICE DESCRIPTION
¯¯¯
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
L
:
Low End Potentiometer Terminal (CAT5127 only)
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.
¯¯
CS:
Chip Select
The chip select input is used to activate the control
input of the device 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. CAT5127 has an
¯¯
internal pull-up resistor on the CS input pin.
V
CC
:
Supply Input for the device.
Doc. No. MD-2127 Rev. C
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CATALYST [ CATALYST SEMICONDUCTOR ]
