DP7221

© NIDEC COPAL ELECTRONICS CORP.

1

Doc. No. MD-2113 Rev. K

Characteristics subject to change without notice

Dual Digital Potentiometer (DP) with

64 Taps and 2-wire Interface

FEATURES

Two linear-taper digital potentiometers

64 resistor taps per potentiometer

End to end resistance 2.5k , 10k , 50k

or

100k

Potentiometer control and memory access via

2-wire interface (I

Low wiper resistance, typically 80

Nonvolatile memory storage for up to four

wiper settings for each potentiometer

Automatic recall of saved wiper settings at

power up

2.5 to 6.0 volt operation

Standby current less than 1µA

1,000,000 nonvolatile WRITE cycles

100 year nonvolatile memory data retention

20-lead SOIC and TSSOP packages

Industrial temperature range

For Ordering Information details, see page 15.

PIN CONFIGURATION

SOIC 20 Lead (W)

TSSOP 20 Lead (Y)

219 NC

318 NC

A0

417 NC

A2

516 A1

615 A3

714 SCL

RH1

813 NC

SDA

912 NC

GND

10

11 NC

DP

7221

DESCRIPTION

The

DP7221

is

two

Digital

Potentiometers

(DPs) integrated with control logic and 16 bytes

of

NVRAM

memory.

Each

DP

consists

of

a

series

of

63

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

6-bit control register (WCR) independently controls

the wiper tap switches for each DP. Associated with

each wiper control register are four 6-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 registers is via a 2-wire

serial bus (I

first data register (DR0) for each of the four

potentiometers

is

automatically

loaded

into

its

respective wiper control register (WCR).

The DP7221 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.

FUNCTIONAL DIAGRAM

SCL

SDA

A0

A1

A2

A3

NONVOLATILE

DATA

REGISTERS

WIPER

CONTROL

REGISTERS

CONTROL

LOGIC

2-WIRE

INTERFACE