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CAT5115 Datasheet

32-Tap Digitally Potentiometer

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CAT5115 pdf
CAT5115
32‐tap Digital
Potentiometer (POT)
Description
The CAT5115 is a single digital POT designed as an electronic
replacement for mechanical potentiometers and trim pots. Ideal for
automated adjustments on high volume production lines, they are also
well suited for applications where equipment requiring periodic
adjustment is either difficult to access or located in a hazardous or
remote environment.
The CAT5115 contains a 32-tap series resistor array connected
between two terminals RH and RL. An up/down counter and decoder
that are controlled by three input pins, determines which tap is
connected to the wiper, RW. The wiper is always set to the mid point,
tap 15 at power up. The tap position is not stored in memory.
Wiper-control of the CAT5115 is accomplished with three input
control pins, CS, U/D, and INC. The INC input increments the wiper
in the direction which is determined by the logic state of the U/D input.
The CS input is used to select the device.
The digital POT can be used as a three-terminal resistive divider or
as a two-terminal variable resistor. Digital POTs bring variability and
programmability to a wide variety of applications including control,
parameter adjustments, and signal processing.
For a pin-compatible device that recalls a stored tap position on
power-up refer to the CAT5114 data sheet.
Features
32-position Linear Taper Potentiometer
Low Power CMOS Technology
Single Supply Operation: 2.5 V 6.0 V
Increment Up/Down Serial Interface
Resistance Values: 10 kW, 50 kW and 100 kW
Available in PDIP, SOIC, TSSOP, MSOP Packages
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
Automated Product Calibration
Remote Control Adjustments
Offset, Gain and Zero Control
Tamper-proof Calibrations
Contrast, Brightness and Volume Controls
Motor Controls and Feedback Systems
Programmable Analog Functions
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SOIC8
V SUFFIX
CASE 751BD
MSOP8
Z SUFFIX
CASE 846AD
PDIP8
L SUFFIX
CASE 646AA
TSSOP8
Y SUFFIX
CASE 948AL
PIN CONFIGURATIONS
INC
U/D
RH
GND
1
VCC
CS
RL
RWB
PDIP (L), SOIC (V), MSOP (Z)
1
CS
VCC
INC
U/D
TSSOP (Y)
(Top Views)
RL
RGWNBD
RH
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
Semiconductor Components Industries, LLC, 2013
June, 2013 Rev. 11
1
Publication Order Number:
CAT5115/D


  ON Semiconductor Electronic Components Datasheet  

CAT5115 Datasheet

32-Tap Digitally Potentiometer

No Preview Available !

CAT5115 pdf
CAT5115
Functional Diagram
VCC
U/D
Control
INC and
PowerOn
CS Recall
GND
Figure 1. General
VDD
RH GND
CS
RW INC
U/D
RL
RH/VH
RH
RW/VW
RW
RL/VL
Figure 2. Detailed
RL
Figure 3. Electronic
Potentiometer
Implementation
Table 1. PIN DESCRIPTIONS
Name
Function
INC Increment Control
U/D Up/Down Control
RH
GND
Potentiometer High Terminal
Ground
RW Buffered Wiper Terminal
RL Potentiometer Low Terminal
CS Chip Select
VCC Supply Voltage
Pin Function
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 RH 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 RL terminal.
RH: High End Potentiometer Terminal
RH is the high end terminal of the potentiometer. It is not
required that this terminal be connected to a potential greater
than the RL terminal. Voltage applied to the RH terminal
cannot exceed the supply voltage, VCC or go below ground,
GND.
RW: Wiper Potentiometer Terminal
RW 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 RW terminal cannot
exceed the supply voltage, VCC or go below ground, GND.
RL: Low End Potentiometer Terminal
RL is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential less
than the RH terminal. Voltage applied to the RL terminal
cannot exceed the supply voltage, VCC or go below ground,
GND. RL and RH are electrically interchangeable.
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 RH and RL equivalent to the high and low
terminals and RW equivalent to the mechanical
potentiometer’s wiper. There are 32 available tap positions
including the resistor end points, RH and RL. There are 31
resistor elements connected in series between the RH and RL
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 will 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.
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2


Part Number CAT5115
Description 32-Tap Digitally Potentiometer
Maker ON Semiconductor
Total Page 12 Pages
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