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DS1805

Addressable Digital Potentiometer

Maxim Integrated 

Addressable Digital Potentiometer

L1

POTENTIOMETER-1 H1

256-TO-1 MULTIPLEXER

SRAM

REG-0 (8-BIT REGISTER)

WIPER-1 (8-BIT REGISTER)

W1

SCL

SDA

2-WIRE SERIAL

INTERFACE

COMMAND/

CONTROL

UNIT

DEVICE ADDRESS

SELECTION

Figure 1. Functional Diagram

Pin Description

PIN

TSSOP SO

1

1

2

3

3

6, 5, 4

7

8

9

10–13

14

4

7, 6, 5

8

9

10

2, 11–15

16

NAME

FUNCTION

H1

L1

W1

A0, A1, A2

GND

SCL

SDA

N.C.

VCC

High End of

Potentiometer

Low End of

Potentiometer

Wiper Terminal of

Potentiometer

Address Select Inputs

Ground

Serial Clock Input

Serial Data I/O

No Connection

3V/5V Power-Supply

Input

A0

A1

A2

Detailed Description

The DS1805 addressable digital potentiometer contains a

single 256-position digitally controlled potentiometer.

Device control is achieved through a 2-wire serial inter-

face. Device addressing is provided through three

address inputs that allow up to eight devices on a single

2-wire bus. The exact wiper position of the potentiometer

can be written or read. The DS1805 is available in 16-pin

SO and 14-pin TSSOP packages. The device is available

in three standard resistance values: 10kΩ, 50kΩ, and

100kΩ. The DS1805 specified over the industrial temper-

ature range. The DS1805 is provides a low-cost alterna-

tive for designs based on the DS1803, but require only a

single potentiometer.

Device Operation

The DS1805 is an addressable, digitally controlled

device that has a single 256-position potentiometer.

Figure 1 shows a block diagram of the part.

Communication and control of the device is accom-

plished through a 2-wire serial interface that has SDA

and SDL signals. Device addressing is attained using

the device chip-select inputs A0, A1, and A2.

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