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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. |
35 |
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