DESCRIPTION

The DS1668 and DS1669 Dallastats are digital rheo stats or potentiometers. These units provide 64 possible uniform tap points over the resistive range and are available in standard versions of 10K, 50K, and 100Kohms. The Dallastats can be controlled by either a mechanical–type contact closure input or a digital source input such as a CPU. Wiper position is maintained in the absence of power which is accomplished through the use of a EEPROM memory cell array. The EEPROM cell array is specified to accept greater than 80,000 writes.

FEATURES

? Replaces mechanical variable resistors

? Available as the DS1668 with manual interface or the DS1669 integrated circuit

? Human engineered interface provides easy control with DS1668

? Electronic interface provided for digital as well as manual control

? Wide differential input voltage range between 4.5 and 8 volts

? Wiper position is maintained in the absence of power

? Low cost alternative to mechanical controls

? Applications include volume, tone, contrast, bright ness, and dimmer control

? 8–pin SOIC and 8–pin DIP packages for DS1669

? Standard resistance values for Dallastat

– DS1668/DS1669–10 ~ 10K?

– DS1668/DS1669–50 ~ 50K?

– DS1668/DS1669–100 ~ 100K?

? Operating Temperature Range

– Commercial: 0°C to 70°C; DS1668, DS1669

– Industrial: –40°C to +85°C; DS1669