DESCRIPTION：

 The DS1669 Dallastat is a digital rheostat or potentiometer. This device provides 64 possible uniform tappoints over the entire resistive range. The standard resistive ranges are 10 k, 50 k, and 100 k. TheDallastat can be controlled by either a switch contact closure input or a digital source input such as aCPU. Wiper position is maintained in the absence of power through the use of a EEPROM memory cellarray. The EEPROM cell array will withstand more than 50,000 writes.The DS1669 is offered in two standard IC packages which include an 8-pin 300-mil DIP and an 8-pin208-mil SOIC. The DS1669 can be configured to operate using a single pushbutton, dual pushbutton ordigital source input by varying power-on conditions. This is illustrated in Figures 1 and 2. The DS1669pinouts allow access to both ends of the potentiometer RL, RH, and the wiper, RW. Control inputs includeDS1669Dallastat Electronic Digital Rheostatwww.maxim-ic.com+VDCRW(RL) -VDUC(RH) 876512348-Pin DIP (300-mil)See Mech. Drawings Section12348765+VDCRW(RL) VDUC(RH)8-Pin SOIC (208-mil)See Mech. Drawings SectionDS1669 2 of 10the digital source input, D, the up contact input, UC, and the down contact input, DC. Other pins includethe positive, +V, and negative, -V, supply inputs. The DS1669 is specified to operate from -40°C to+85°C. 

FEATURES：

Replaces mechanical variable resistors

Electronic interface provided for digital as well as manual control

Wide differential input voltage range between 4.5 and 8V

Wiper position is maintained in the absence of power

Low-cost alternative to mechanical controls

Applications include volume, tone, contrast,brightness, and dimmer control

Available in 8-pin SOIC and 8-pin DIP packages

Standard resistance values for Dallastat:

DS1669-10 ~ 10 kΩ

DS1669-50 ~ 50 kΩ

DS1669-100 ~ 100 kΩ

Operating Temperature Range

Industrial: -40°C to +85°C