CAT5261 datasheet(1/15 Pages) CATALYST

Part #	CAT5261

Description	Dual Digitally Programmable Potentiometer

PDF	15 Pages

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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DESCRIPTION

The CAT5261 is two Digitally Programmable

Potentiometers (DPPs™) integrated with control logic

and 8 bytes of NVRAM memory. Each DPP consists of

a series of resistive elements connected between two

externally accessible end points. The tap points between

each resistive element are connected to the wiper outputs

with CMOS switches. A separate 8-bit control register

(WCR) independently controls the wiper tap switches for

each DPP. Associated with each wiper control register

are four 8-bit non-volatile memory data registers (DR)

used for storing up to four wiper settings. Writing to the

wiper control register or any of the non-volatile data

CAT5261

Dual Digitally Programmable Potentiometer (DPP™) with

256 Taps and SPI Interface

FEATURES

s Two linear-taper digitally programmable

potentiometers

s 256 resistor taps per potentiometer

s End to end resistance 50k

Ω or 100kΩ

s Potentiometer control and memory access via

SPI interface

s Low wiper resistance, typically 100

Ω

s Nonvolatile memory storage for up to four wiper

settings for each potentiometer

s Automatic recall of saved wiper settings at

power up

s 2.5 to 6.0 volt operation

s Standby current less than 1

µA

s 1,000,000 nonvolatile WRITE cycles

s 100 year nonvolatile memory data retention

s 24-lead SOIC and 24-lead TSSOP

s Industrial temperature range

PIN CONFIGURATION

FUNCTIONAL DIAGRAM

Characteristics subject to change without notice

Document No. 2122, Rev. B

registers is via a SPI serial bus. On power-up, the

contents of the first data register (DR0) for each of the

potentiometers is automatically loaded into its respective

wiper control register.

The CAT5261 can be used as a potentiometer or as a

two terminal, variable resistor. It is intended for circuit

level or system level adjustments in a wide variety of

applications. It is available in the -40

°C to 85°C industrial

operating temperature range and offered in a 24-lead

SOIC and TSSOP package.

ALO

GEN FR

TM

LEAD FREE

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1

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CAT

5261

SO

A0

NC

VCC

RL0

RH0

RW0

CS

WP

HOLD

SCK

NC

GND

RW1

RH1

RL1

A1

SI

SOIC/TSSOP Package (J, W/U, Y)

R

H0

W0

W1

H1

R

RL0

L1

R

WIPER

CONTROL

REGISTERS

NONVOLATILE

DATA

REGISTERS

SPI BUS

INTERFACE

CONTROL

LOGIC

A0

A1

R

WP

CS

SCK

SI

SO

HOLD

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