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DS1668, DS1669, DS1669S

Dallastat

Electronic Digital Rheostat

DS1668, DS1669, DS1669S

081895 1/10

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

10KΩ

– DS1668/DS1669–50

50KΩ

– DS1668/DS1669–100

100KΩ

• Operating Temperature Range

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

– Industrial: –40°C to +85°C; DS1669

PIN ASSIGNMENT DS1668

NC DR

-VR

PIN 1

INDICATOR

TOP VIEW

123

654

INTEGRATED

PUSHBUTTON

PIN ASSIGNMENT DS1669

–V

)

8-Pin DIP (300 Mil)

V-

)

8-Pin SOIC (208 Mil)

PIN DESCRIPTION DS1669

- Resistor High End

- Resistor Wiper

- Resistor Low End

-V, +V - Voltage Inputs

UC - Up Contact Input

D - Digital Input

DC - Down Contact Input

PIN DESCRIPTION DS1668

+V - Positive Voltage Input

-V - Negative Voltage

- Resistor Wiper

D - Digital Input

- Resistor High End

NC - No Connection - Pin Missing

Summary of content (10 pages)

PAGE 1
DS1668, DS1669, DS1669S DS1668, DS1669, DS1669S DallastatTM Electronic Digital Rheostat FEATURES PIN ASSIGNMENT DS1669 • Replaces mechanical variable resistors • Available as the DS1668 with manual interface or the DS1669 integrated circuit • Human engineered interface provides easy control with DS1668 (RH) 1 8 +V UC 2 7 DC D 3 6 RW (RL) 4 5 –V 8-Pin DIP (300 Mil) • Electronic interface provided for digital as well as manual control • Wide differential input voltage range between 4
PAGE 2
DS1668, DS1669, DS1669S DESCRIPTION The DS1668 and DS1669 Dallastats are digital rheostats or potentiometers. These units provide 64 possible uniform tap points over the resistive range and are available in standard versions of 10K, 50K, and 100K ohms. 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.
PAGE 3
DS1668, DS1669, DS1669S DS1669 SINGLE PUSHBUTTON CONFIGURATION (TYPICAL EXAMPLE) Figure 1 DS1669 RH V+ UC DC D RW RL V– DS1669 DUAL PUSHBUTTON CONFIGURATION (TYPICAL APPLICATION) Figure 2 DS1669 RH V+ UC DC D RW RL V– 081895 3/10
PAGE 4
DS1668, DS1669, DS1669S Dallastats interpret input pulse widths as the means of controlling wiper movement. A single pulse width input over the UC, DC, or D terminals will cause the wiper position to move 1/64th of the total resistance. All inputs, UC, DC, or D, are inactive when in the high state. A transition from a high to low on these inputs is considered the beginning of pulse activity.
PAGE 5
DS1668, DS1669, DS1669S DS1668 DALLASTATTM BLOCK DIAGRAM Figure 3 + INPUT INTERPRETER AND CONTROL D UC DC RL SHADOW MEMORY 64 TO 1 MUXER RH RHEOSTAT NOTE: RW DOTTED LINE CONNECTIONS AND COMPONENTS ARE INTERNAL TO THE DS1668 AND DO NOT EXIST ON THE DS1669.
PAGE 6
DS1668, DS1669, DS1669S FLOWCHART: TWO BUTTON OPERATION Figure 5 CONTACT CLOSURE UC UC OR DC? DC YES AT UPPER LIMIT? YES BOTH CONTACTS OPEN? YES NO NO INCREMENT 1/64TH CONTACT CLOSED CONTINUOUSLY >1 SEC? DECREMENT 1/64TH NO NO DECREMENT ON 100MS INTERVALS INCREMENT ON 100MS INTERVALS AT UPPER LIMIT? YES YES CONTACT OPEN AND CONTACT CLOSURE TIMING IS 1 sec.
PAGE 7
DS1668, DS1669, DS1669S ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to -V Operating Temperature Storage Temperature Soldering Temperature -V –0.5V + 8.0V 0°C to 70°C commercial; –40°C to +85°C industrial –55°C to +125°C 260°C for 15 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.
PAGE 8
DS1668, DS1669, DS1669S ANALOG RESISTOR CHARACTERISTICS PARAMETER SYMBOL (-40°C to +85°C) MAX UNITS –20 +20 % Absolute Linearity –0.75 +0.75 LSB 11 Relative Linearity –0.3 +0.
PAGE 9
DS1668, DS1669, DS1669S NOTES: 1. All inputs; UV, DC, and D are internally pulled up with a resistance of 100KΩ. 2. Input logic levels are referenced to -V. 3. ICC is the internal current that flows between -V and +V. 4. Input leakage applies to contact inputs UC and DC and digital input (D). 5. Wiper current and rheostat currents are the maximum current which can flow in the resistive elements. 6. Capacitance values apply at 25°C. 7.
PAGE 10
DS1668, DS1669, DS1669S DS1668 PUSHBUTTON DIMENSIONS .420 PIN 1 INDICATOR .420 .185 .100 .185 .035 .125 .022 .012 .100 .