DS1669

The DS1669 Dallastat^TMis a digital rheostat or potentiometer. This device provides 64 possible uniformtap points over the entire resistive range. The standard resistive ranges are 10 k, 50 k, and 100 k.The Dallastat can becontrolled 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 includethe 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 to+85.