DS1869

` 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
   - DS1869-50 ~ 50 k
   - DS1869-100 ~ 100 k
` Operating temperature range:
   - Industrial: -40 to +85
` 3V to 8V differential supply operational range

Voltage on Any Pin Relative to -V ............................................-V -0.5V +8.0V
Operating Temperature ...........................................................-40 to +85
Storage Temperature ............................................................-55 to +125
Soldering Temperature ................................................260 for 10 seconds

* This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

The DS1869 DallastatTM is a digital rheostat or potentiometer. This device provides 64 possible uniform tap points over the entire resistive range. The standard resistive ranges are 10 k, 50 k, and 100 k.

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 pinouts allow access to both ends of the potentiometer RL, RH, and the wiper, RW. Control inputs include 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 to +85.