linux/Documentation/hwmon/ds620
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   1Kernel driver ds620
   2===================
   3
   4Supported chips:
   5  * Dallas Semiconductor DS620
   6    Prefix: 'ds620'
   7    Datasheet: Publicly available at the Dallas Semiconductor website
   8               http://www.dalsemi.com/
   9
  10Authors:
  11        Roland Stigge <stigge@antcom.de>
  12        based on ds1621.c by
  13        Christian W. Zuckschwerdt <zany@triq.net>
  14
  15Description
  16-----------
  17
  18The DS620 is a (one instance) digital thermometer and thermostat. It has both
  19high and low temperature limits which can be user defined (i.e.  programmed
  20into non-volatile on-chip registers). Temperature range is -55 degree Celsius
  21to +125. Between 0 and 70 degree Celsius, accuracy is 0.5 Kelvin. The value
  22returned via sysfs displays post decimal positions.
  23
  24The thermostat function works as follows: When configured via platform_data
  25(struct ds620_platform_data) .pomode == 0 (default), the thermostat output pin
  26PO is always low. If .pomode == 1, the thermostat is in PO_LOW mode. I.e., the
  27output pin PO becomes active when the temperature falls below temp1_min and
  28stays active until the temperature goes above temp1_max.
  29
  30Likewise, with .pomode == 2, the thermostat is in PO_HIGH mode. I.e., the PO
  31output pin becomes active when the temperature goes above temp1_max and stays
  32active until the temperature falls below temp1_min.
  33
  34The PO output pin of the DS620 operates active-low.
  35
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