DP7409

© NIDEC COPAL ELECTRONICS CORP.

1

Doc. No. MD-2010 Rev. K

Characteristics subject to change without notice

Quad Digital Potentiometers

(DP) with 64 Taps and 2-wire Interface

FEATURES

Four linear taper digital potentiometers

64 resistor taps per potentiometer

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

or

100k

2-wire interface (I

Low wiper resistance, typically 80

Four non-volatile wiper settings for each

potentiometer

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

24-lead SOIC and 24-lead TSSOP

Write protection for data register

For Ordering Information details, see page 15.

PIN CONFIGURATION

TSSOP (Y)

SOIC (W)

DESCRIPTION

The

DP7409

is

four

Digital

Potentiometers

(DP) integrated with control logic and 16 bytes

of NVRAM memory.

A separate 6-bit control register (WCR) independently

controls

the

wiper

tap

position

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

power-up, the contents of the first data register (DR0)

for each of the four potentiometers is automatically

loaded into its respective wiper control register

(WCR).

The Write Protection (WP

¯¯¯) pin protects against

inadvertent programming of the data register.

The DP7409 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

NONVOLATILE

DATA

REGISTERS

CONTROL LOGIC

WIPER CONTROL

REGISTERS

2-WIRE BUS

INTERFACE

SCL

SDA

WP

2

23

322

124

NC

4

21

520

NC

619

WP

SCL

8

17

916

718

SDA

10

15

11

14

C

N

D

N

G

12

13

2

23

322

124

4

21

520

NC

619

WP

SCL

8

17

916

718

SDA

10

15

NC

11

14

GND

NC

12

13