0001 Kernel driver ds620
0002 ===================
0003
0004 Supported chips:
0005
0006 * Dallas Semiconductor DS620
0007
0008 Prefix: 'ds620'
0009
0010 Datasheet: Publicly available at the Dallas Semiconductor website
0011
0012 http://www.dalsemi.com/
0013
0014 Authors:
0015 Roland Stigge <stigge@antcom.de>
0016 based on ds1621.c by
0017 Christian W. Zuckschwerdt <zany@triq.net>
0018
0019 Description
0020 -----------
0021
0022 The DS620 is a (one instance) digital thermometer and thermostat. It has both
0023 high and low temperature limits which can be user defined (i.e. programmed
0024 into non-volatile on-chip registers). Temperature range is -55 degree Celsius
0025 to +125. Between 0 and 70 degree Celsius, accuracy is 0.5 Kelvin. The value
0026 returned via sysfs displays post decimal positions.
0027
0028 The thermostat function works as follows: When configured via platform_data
0029 (struct ds620_platform_data) .pomode == 0 (default), the thermostat output pin
0030 PO is always low. If .pomode == 1, the thermostat is in PO_LOW mode. I.e., the
0031 output pin PO becomes active when the temperature falls below temp1_min and
0032 stays active until the temperature goes above temp1_max.
0033
0034 Likewise, with .pomode == 2, the thermostat is in PO_HIGH mode. I.e., the PO
0035 output pin becomes active when the temperature goes above temp1_max and stays
0036 active until the temperature falls below temp1_min.
0037
0038 The PO output pin of the DS620 operates active-low.
