CAT5127_13 Datasheet, PDF (2/10 Pages) ON Semiconductor – 32‐tap Digital Potentiometers (POTs)

CAT5127
V_CC
CAT5127, CAT5129
CAT5129
V_CC
R_P
(U/D)
(INC)
(CS)
Control
and
Memory
POR
GND
Table 1. PIN DESCRIPTIONS
R_H
(U/D)
(INC)
(CS)
R_L
Figure 1. Functional Diagrams
Name
INC
U/D
R_H
GND
NC
R_L
CS
V_CC
Function
Increment Control
Up/Down Control
Potentiometer High Terminal
Ground
No Connect
Potentiometer Low Terminal
Chip Select
Supply Voltage
Control
and
Memory
POR
GND
CAT5127
MSOP/TDFN
1
2
3
4
5
6
7
8
R_H
CAT5129
SOT23
4
3
5
2
−
−
1
6
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.
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