Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer linear Permanent SOIC 8 N

1 of 10 19-7387; Rev 4/14

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

PIN DESCRIPTION

- Supply Voltage

- High End of Resistor

- Low End of Resistor

- 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.

DS1809

Dallastat

1 8 V

UC 2 7 DC

STR 3 6 R

4 5 GND

PDIP (300 mils)

SO (150 mils)

μSOP (118 mils)

Summary of content (10 pages)

PAGE 1
DS1809 Dallastat FEATURES        PIN ASSIGNMENT 64-Position Linear Taper Two Nonvolatile Wiper Storage Options Operates from +4.5V to +5.
PAGE 2
DS1809 BLOCK DIAGRAM Figure 1 OPERATION The DS1809 Dallastat is a digitally controlled, nonvolatile potentiometer. A block diagram of the DS1809 is shown in Figure 1. The DS1809 is a linear potentiometer providing 64-uniform wiper positions over the entire resistor range including the end-terminals. All three potentiometer terminals of the device are accessible. These terminals include RH, RL, and RW. RH and RL are the end-terminals of the potentiometer.
PAGE 3
DS1809 1/2(second) + 62 x 100ms = 6.7 (seconds) If the wiper position of the DS1809 is incremented to an end-position, it will stay at that position until the device receives an opposite direction input pulse command over the UC or DC inputs. For example, if the wiper position is incremented to the RH terminal using the UC input control, it will stay at that position until UC is first deactivated, and then the DC input is activated to move the wiper position towards the RL terminal.
PAGE 4
DS1809 PUSHBUTTON CONFIGURATION Figure 2 It is assumed that the STR input will be controlled by either external logic or CPU driven. No external capacitors or diodes are needed for the command-initiated storage operation. The STR input will take precedence over the pushbutton inputs UC and DC.
PAGE 5
DS1809 PUSHBUTTON TIMING DIAGRAMS Figure 4 If during any pushbutton activity the STR input is activated, pushbutton operation will be suspended until the storage of EEPROM has been completed. Once complete, pushbutton inputs, if still active, will resume from the point of suspension. Command initiated storage operations will require a minimum of 4 ms to complete the storage operation. This 4ms is measured from the rise of STR input (see Figure 5).
PAGE 6
DS1809 ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature -1.0V to +7.0V -40°C to +85°C; industrial -55°C to +125°C See J-STD-020A Specification 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.
PAGE 7
DS1809 AC ELECTRICAL CONDITIONS PARAMETER SYMBOL MIN Single Input Pulse Width tPW Repetitive Pulse High Time TYP MAX UNITS NOTES 1 DC ms 4,5,7,9 tHPW 1 DC ms 4,5,7,8,9 Continuous Pulse tCCP 1 DC ms 4,5,7,8,9 Storage Control Pulse tSTR 1 μs 10,12 Capacitance CIN pF 10 5 10 ANALOG RESISTOR CHARACTERISTICS ELECTRICAL CONDITIONS PARAMETER SYMBOL MIN TYP MAX UNITS NOTES End-to-End Resistor Tolerance -20 +20 % 14 Absolute Linearity -0.6 +0.
PAGE 8
DS1809 14. Valid at +25°C only. 15. Absolute linearity is used to compare measured wiper voltage versus expected wiper voltage as determined by wiper position. The DS1809 is specified to provide a absolute linearity of ±0.60 LSB. 16. Relative linearity is used to determine the change in voltage between successive tap positions. The DS1809 is specified to provide a relative linearity specification of ±0.25 LSB. 17.
PAGE 9
DS1809 ORDERING INFORMATION PART DS1809-010+ DS1809-050+ DS1809-100+ DS1809U-010+T DS1809U-050+T DS1809U-100+T DS1809Z-010+ DS1809Z-050+ DS1809Z-100+ TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C VERSION (kΩ) 10 50 100 10 50 100 10 50 100 PIN-PACKAGE TOP MARK 8 PDIP 8 PDIP 8 PDIP 8 µSOP 8 µSOP 8 µSOP 8 SO 8 SO 8 SO DS1809-010 DS1809-050 DS1809-100 1809 X 1809 L 1809 C DS1809 X DS1809 L DS1809 C +Denot
PAGE 10
DS1809 REVISION HISTORY REVISION DATE 4/14 DESCRIPTION Added lead(Pb)-free parts and top mark information to the Ordering Information table; added the Package Information table PAGES CHANGED 9 . 10 of 10 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.