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DS2890(3)                    One-Wire File System                    DS2890(3)


NAME

       DS2890 - 1-Wire Digital Potentiometer


SYNOPSIS

       Variable resistance

       2C [.]XXXXXXXXXXXX[XX][/[ chargepump | wiper |

       See the file man3/standard_mini.3so.

       ]]


FAMILY CODE

       2C


SPECIAL PROPERTIES

   chargepump
       read-write, yes-no
       State of the chargepump in the chip (0 = off 1 = on). Only available if
       external power is available (hence not in the TO-92 packaging) at pin
       Vdd.
       When chargepump is on, the wiper resistance will range between Rh and
       Rl relatively linearly.
       When chargepump is off, the wiper resistance (to ground) will range
       relatively linearly (to 100kOhms).

   wiper
       read-write, unsigned integer
       Value of the variable element, 0 to 255. The actual interpretation of
       wiper depands on the chargepump state, but in general 0 is low and 255
       is high.


STANDARD PROPERTIES

       See the file man3/standard.3so.


ALARMS

       The device condition that will cause individual DS2890s to participate
       in a Conditional Search is a wiper position located at the power-on
       default setting (00h). This feature enables the bus master to easily
       determine whether a potentiometer has gone through a power-on reset and
       needs to be re-configured with a required wiper position setting.


DESCRIPTION

       See the file man3/description.3so.

   DS2890
       The D2890 (3) allows variable resistance under 1-wire control. Possible
       uses are analog feedback mechanisms (sound pitch, light level).

       Although there are provisions in the datasheet for different DS2890
       configurations (non-linear wiper ranges, multiple wipers, different
       resistance scales) non are in production. To simplify implementation,
       this driver assumes the standard DS2890 design.


ADDRESSING

       See the file man3/addressing.3so.


DATASHEET

       http://pdfserv.maxim-ic.com/en/ds/DS2890.pdf


SEE ALSO

       See the file man3/seealso.3so.


AVAILABILITY

       http://www.owfs.org


AUTHOR

       Paul Alfille (paul.alfille@gmail.com)

OWFS Manpage                         2003                            DS2890(3)

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