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DS1805

Addressable Digital Potentiometer

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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.

SCL

SDA

2-WIRE SERIAL

INTERFACE

REG-0 (8-BIT REGISTER)

SRAM

WIPER-1 (8-BIT REGISTER)

COMMAND/

CONTROL

UNIT

DEVICE ADDRESS

SELECTION

256-TO-1 MULTIPLEXER

POTENTIOMETER-1

Figure 1. Functional Diagram

TSSOP

NAME FUNCTION

11 H1

High End of

Potentiometer

23 L1

Low End of

Potentiometer

34 W1

Wiper Terminal of

Potentiometer

6, 5, 4

7, 6, 5

A0, A1, A2

Address Select Inputs

78 GND Ground

89 SCL Serial Clock Input

910 SDA Serial Data I/O

10–13

2, 11–15

N.C. No Connection

14 16 V

3V/5V Power-Supply

Input

Pin Description

1 2 3 4 5 6 7 8 9 10

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