CAT5114LI-10-G Datasheet, PDF (1/15 Pages) ON Semiconductor – 32-Tap Digitally Programmable Potentiometer

CAT5114
32-Tap Digitally Programmable Potentiometer (DPP™)
FEATURES
„ 32-position linear taper potentiometer
„ Non-volatile EEPROM wiper storage
„ Low standby current
„ Single supply operation: 2.5V – 6V
„ Increment up/down serial interface
„ Resistance values: 10kΩ, 50kΩ and 100kΩ
„ Available in PDIP, SOIC, TSSOP, MSOP and
space saving 2 x 2.5mm TDFN packages
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
For Ordering Information details, see page 14.
DESCRIPTION
The CAT5114 is a single digitally programmable
potentiometer (DPP™) designed as a 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 CAT5114 contains a 32-tap series resistor array
connected between two terminals R_H and R_L. An up/
down counter and decoder that are controlled by three
input pins, determines which tap is connected to the
wiper, R_W. The wiper setting, stored in nonvolatile
memory, is not lost when the device is powered down
and is automatically reinstated when power is
returned. The wiper can be adjusted to test new
system values without affecting the stored setting.
Wiper-control of the CAT5114 is accomplished with
three input control pins, C¯¯S, U/D¯, and I¯N¯C¯. The I¯N¯C¯
input increments the wiper in the direction which is
determined by the logic state of the U/D¯ input. The C¯¯S
input is used to select the device and also store the
wiper position prior to power down.
The digitally programmable potentiometer can be
used as a three-terminal resistive divider or as a two-
terminal variable resistor. DPPs bring variability and
programmability to a wide variety of applications
including control, parameter adjustments, and signal
processing.
FUNCTIONAL DIAGRAM
U/D
INC
V_CC
CS
U/D
Control
INC
and
Memory
CS
Power On Recall
GND
R_H/V_H
R_W/V_W
R_L/V_L
V_CC
GND
General
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
5-BIT
UP/DOWN
COUNTER
5-BIT
NONVOLATILE
MEMORY
STORE AND
RECALL
CONTROL
CIRCUITRY
31
30
29
28
32-POSITION
DECODER
2
1
0
Detailed
1
R_H/V_H
R_H/V_H
TRANSFER RESISTOR
GATES
ARRAY
R_W/V_W
R_L/V_L
R_W/V_W
R_L/V_L
Electronic Potentiometer
Implementation
Doc. No. MD-2007 Rev. R