CAT5127_0708 Datasheet, PDF (2/13 Pages) Catalyst Semiconductor – 32-Tap Digitally Programmable Potentiometer (DPP™)

CAT5127, CAT5129
PIN CONFIGURATION
MSOP/TDFN
CAT5127
I¯N¯C¯ 1
8 V_CC
U/D¯ 2
7 C¯¯S
R_H 3
6 R_L
GND 4
5 NC
TSOT23-6
CAT5129
C¯¯S 1
6 V_CC
GND 2
5 R_H
U/D¯ 3
4 I¯N¯C¯
PIN DESCRIPTIONS
Name Function
I¯N¯C¯ Increment Control
U/D¯ Up/Down Control
R_H
Potentiometer High
Terminal
GND Ground
NC No Connect
R_L
Potentiometer Low
Terminal
C¯¯S Chip Select
V_CC Supply Voltage
CAT5127 CAT5129
MSOP/TDFN SOT23
1
4
2
3
3
5
4
2
5
-
6
-
7
1
8
6
DEVICE DESCRIPTION
I¯N¯C¯: Increment Control Input
The I¯N¯C¯ 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 C¯¯S is low, any
high-to-low transition on I¯N¯C¯ will cause the wiper to
move one increment toward the R_H terminal. When in
a low state and C¯¯S is low, any high-to-low transition
on I¯N¯C¯ 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.
C¯¯S: 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 I¯N¯C¯ and U/D¯ inputs will not affect
or change the position of the wiper. CAT5127 has an
internal pull-up resistor on the C¯¯S 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