Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver ds620 2 =================== 3 4 Supported chips: 5 * Dallas Semiconductor DS620 6 Prefix: 'ds620' 7 Datasheet: Publicly available at the Dallas Semiconductor website 8 http://www.dalsemi.com/ 9 10 Authors: 11 Roland Stigge <stigge@antcom.de> 12 based on ds1621.c by 13 Christian W. Zuckschwerdt <zany@triq.net> 14 15 Description 16 ----------- 17 18 The DS620 is a (one instance) digital thermometer and thermostat. It has both 19 high and low temperature limits which can be user defined (i.e. programmed 20 into non-volatile on-chip registers). Temperature range is -55 degree Celsius 21 to +125. Between 0 and 70 degree Celsius, accuracy is 0.5 Kelvin. The value 22 returned via sysfs displays post decimal positions. 23 24 The thermostat function works as follows: When configured via platform_data 25 (struct ds620_platform_data) .pomode == 0 (default), the thermostat output pin 26 PO is always low. If .pomode == 1, the thermostat is in PO_LOW mode. I.e., the 27 output pin PO becomes active when the temperature falls below temp1_min and 28 stays active until the temperature goes above temp1_max. 29 30 Likewise, with .pomode == 2, the thermostat is in PO_HIGH mode. I.e., the PO 31 output pin becomes active when the temperature goes above temp1_max and stays 32 active until the temperature falls below temp1_min. 33 34 The PO output pin of the DS620 operates active-low.