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112099

FEATURES

Replaces mechanical variable resistors

Operates from 3V or 5V supplies

Electronic interface provided for digital as

well as manual control

Internal pull-ups with debounce for easy

interfacing to mechanical push buttons

Wiper position is maintained in the absence of

power

Low cost alternative to mechanical controls

Applications include volume, tone, contrast,

brightness, and dimmer control

8-pin SOIC and 8-pin DIP packages are

available

Standard resistance values for Dallastat

-

DS1869-10 ~ 10 k

Ω

-

DS1869-50 ~ 50 k

Ω

-

DS1869-100 ~ 100 k

Ω

Operating temperature range:

- Industrial: -40

°C to +85°C

3V to 8V differential supply operational range

PIN ASSIGNMENT

PIN DESCRIPTION

- High Terminal of Potentiometer

- Wiper Terminal of Potentiometer

- Low Terminal of Potentiometer

-V, +V

- Voltage Supply Inputs

UC

- Up Contact Input

D

- Digital Input

DC

- Down Contact Input

DESCRIPTION

The DS1869 Dallastat

tap points over the entire resistive range. The standard resistive ranges are 10 k

Ω, 50 kΩ, and 100 kΩ.

The Dallastat can be controlled by either a switch contact closure input or a digital source input such as a

CPU. The DS1869 operates from 3V or 5V supplies. Wiper position is maintained in the absence of

power through the use of a EEPROM memory cell array. The EEPROM cell array will withstand more

than 50,000 writes.

The DS1869 is offered in two standard IC packages which include an 8-pin 300-mil DIP and an 8-pin

208-mil SOIC. The DS1869 can be configured to operate using a single pushbutton, dual pushbutton or

digital source input by varying power-on conditions. This is illustrated in Figures 1 and 2. The DS1869

the digital source input, D, the up contact input, UC, and the down contact input, DC. Other pins include

the positive, +V, and negative, -V, supply inputs. The DS1869 is specified to operate from -40°C to

+85°C.

DS1869

3V Dallastat

Digital Rheostat

www.dalsemi.com

8-Pin DIP (300-mil)

See Mech. Drawings Section

UC

D

+V

DC

V-

1

2

3

4

8

7

6

5

8-Pin SOIC (208-mil)

See Mech. Drawings Section

UC

D

+V

DC

V-

1

2

3

4

8

7

6

5