DS1809 Dallas Semiconducotr, DS1809 Datasheet
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DS1809
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DS1809 Summary of contents
Page 1
... 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, low voltage device capable of operating from power supplies of +2.7V to +5.5V. The device is ideal for low-power, portable, or battery powered applications. ...
Page 2
... The DS1809 is available in standard and 100 k resistor versions. The DS1809 is provided as an industrial temperature grade part only. Available packaging for the DS1809 include an 8- lead (300-mil) DIP an 8-lead (150-mil) SOIC, and an 8-lead (118-mil) SOP. 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 ...
Page 3
... The total time to transcend the entire potentiometer given a continuous pulse input is provided by the equation: ½(second 100 ms = 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 inputs. For example, if the wiper position is incremented to the R until UC is first deactivated, and then the DC input is activated to move the wiper position towards the R terminal ...
Page 4
... 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. AUTOSTORE CONFIGURATION Figure 3 PUSHBUTTON TIMING DIAGRAMS Figure DS1809 101999 ...
Page 5
... Command initiated storage operations will require a minimum complete the storage operation. This measured from the rise of STR input (see Figure 5). For applications not requiring or using the nonvolatile memory feature of the DS1809 recommended that the STR input be connected to GND. ...
Page 6
... H W GND GND SYMBOL MIN TYP I 500 CC I STBY WIPER WST DS1809 (- +85 C) MAX UNITS NOTES 5 +0 GND 1 (- +85 C) MAX UNITS NOTES 1000 µ µ +0.5 V 6,11 CC +0.8 V 6,11 +0 ...
Page 7
... CCP t 1 STR SYMBOL MIN TYP -20 -0.6 -0.25 f CUTOFF 750 , cannot exceed via a 100 k resistor. CC =+0.8V. For V = 3.0V±10%, maximum DS1809 MAX UNITS NOTES DC ms 4,5,7 4,5,7,8 4,5,7,8,9 µs 10, MAX UNITS NOTES + +0.6 LSB 15 +0.25 LSB 16 MHz 17 ppm/º ...
Page 8
... 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 cutoff frequency characteristics for the DS1809 depend on the potentiometer’ s total resistance. DS1809-010: 1 MHz; DS1809-050: 200 kHz; and the DS1809-100: 100 kHz. ...