CAT5127ZI-50-GT3 datasheet(1/13 Pages) CATALYST

Part #	CAT5127ZI-50-GT3

Description	32-Tap Digitally Programmable Potentiometer (DPP??

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Manufacturer	CATALYST [Catalyst Semiconductor]

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CAT5127, CAT5129

1

Doc. No. MD-2127 Rev. C

Characteristics subject to change without notice

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 – 5.5V

Increment Up/Down serial interface

Resistance values: 10kΩ, 50kΩ and 100kΩ

CAT5127 in tiny 8-lead 2mm x 2.5mm TDFN and

MSOP packages

CAT5129 in the 6-lead TSOT23 package

APPLICATION

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 12.

DESCRIPTION

The CAT5127/CAT5129 are single digitally programmable

potentiometers (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 CAT5127 contains a 32-tap series resistor array

connected between two terminals RH and RL. The

CAT5129 contains a 32-tap series resistor array

connected between two terminals RH and GND. An

up/down counter and decoder that are controlled by

three input pins, determines which tap is connected to

the wiper. 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 effecting the stored setting.

Wiper-control

of

the

CAT5127/CAT5129

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

and also store the wiper position prior to power down.

The devices are used as two-terminal variable

resistors. DPPs bring variability and programmability

to a wide variety of applications including control,

parameter adjustments, and signal processing.

FUNCTIONAL DIAGRAM

CAT5127

CAT5129

(INC)

(U/D)

(CS)

Control

and

Memory

VCC

RP

RH

RL

POR

GND

(INC)

(U/D)

(CS)

Control

and

Memory

VCC

RH

POR

GND

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