1809L View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
1809L Datasheet PDF : 10 Pages
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DS1809
Dallastat
FEATURES
64-Position Linear Taper
Two Nonvolatile Wiper Storage Options
Operates from +4.5V to +5.5V Supplies
Operating Temperature Range:
- Industrial: -40°C to +85°C
Electronic Interface Provides Either Digital
or Pushbutton Control
Low-Cost Alternative to Mechanical
Solutions
Standard Resistance Values
- DS1809-010 10kΩ
- DS1809-050 50kΩ
- DS1809-100 100kΩ
PIN ASSIGNMENT
RH 1
UC 2
STR 3
RL 4
8 VCC
7 DC
6 RW
5 GND
PDIP (300 mils)
SO (150 mils)
μSOP (118 mils)
PIN DESCRIPTION
VCC
- Supply Voltage
RH
- High End of Resistor
RL
- Low End of Resistor
RW
- Wiper Terminal
UC
- Up Control Input
DC
- Down Control Input
STR
- Storage Enable Input
GND
- Ground
DESCRIPTION
The DS1809 Dallastat is a nonvolatile digitally controlled potentiometer that provides 64 uniform wiper
positions over the entire resistor range; including the high-end and low-end terminals of the device. The
DS1809 is a low-power device capable of operating from power supplies of +4.5V to +5.5V. The device
is ideal for low-power, portable, or battery powered applications.
Wiper position is maintained in the absence of power. This is accomplished via the use of an EEPROM
cell array. The device provides for two storage methods, which include an autostore capability and a
command-initiated storage function. The EEPROM cell array is specified to accept greater than 50k
writes. Storage of the wiper position is discussed in the Wiper Storage section of this data sheet.
Wiper positioning is controlled via a dual pushbutton (or contact closure) interface. For simple
pushbutton-controlled applications or CPU-generated control signals, external debounce circuitry is not
needed. The control interface will support both repetitive pulse inputs and continuous pulse (“push-and-
hold”) inputs. Repetitive pulse and continuous pulse control as well as timing diagrams are discussed in
the Operation.
The DS1809 is available in standard 10 kΩ, 50 kΩ, and 100 kΩ resistor versions. The DS1809 is
provided as an industrial temperature grade part only. Available packaging for the DS1809 include an 8-
lead (300-mil) PDIP, an 8-lead (150-mil) SO, and an 8-lead (118-mil) µSOP.
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19-7387; Rev 4/14
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