DS1869 Datasheet, PDF (1/8 Pages) Dallas Semiconductor – 3V Dallastat Electronic Digital Rheostat

DS1869
3V Dallastat^TM Electronic
Digital Rheostat
www.dalsemi.com
FEATURES
PIN ASSIGNMENT
Replaces mechanical variable resistors
Operates from 3V or 5V supplies
(RH)
1
8
+V
Electronic interface provided for digital as
well as manual control
Internal pull-ups with debounce for easy
UC
2
D
3
7
DC
6
(RW)
interfacing to mechanical push buttons
Wiper position is maintained in the absence of
power
Low cost alternative to mechanical controls
(RL)
4
5
V-
8-Pin DIP (300-mil)
See Mech. Drawings Section
Applications include volume, tone, contrast,
brightness, and dimmer control
(RH)
1
8
+V
8-pin SOIC and 8-pin DIP packages are
UC
2
7
DC
available
Standard resistance values for Dallastat
- DS1869-10 ~ 10 kΩ
D
3
6
(RW)
(RL)
4
5
V-
- DS1869-50 ~ 50 kΩ
- DS1869-100 ~ 100 kΩ
8-Pin SOIC (208-mil)
See Mech. Drawings Section
Operating temperature range:
PIN DESCRIPTION
- Industrial: -40°C to +85°C
3V to 8V differential supply operational range
R_H
R_W
R_L
-V, +V
- High Terminal of Potentiometer
- Wiper Terminal of Potentiometer
- Low Terminal of Potentiometer
- Voltage Supply Inputs
UC
- Up Contact Input
D
- Digital Input
DC
- Down Contact Input
DESCRIPTION
The DS1869 Dallastat^TM 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 kΩ, 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
pinouts allow access to both ends of the potentiometer R_L, R_H, and the wiper, R_W. 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°C to
+85°C.
1 of 8
112099