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38 lines
1.3 KiB
38 lines
1.3 KiB
Kernel driver ds620 |
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=================== |
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Supported chips: |
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* Dallas Semiconductor DS620 |
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Prefix: 'ds620' |
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Datasheet: Publicly available at the Dallas Semiconductor website |
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http://www.dalsemi.com/ |
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Authors: |
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Roland Stigge <[email protected]> |
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based on ds1621.c by |
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Christian W. Zuckschwerdt <[email protected]> |
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Description |
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----------- |
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The DS620 is a (one instance) digital thermometer and thermostat. It has both |
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high and low temperature limits which can be user defined (i.e. programmed |
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into non-volatile on-chip registers). Temperature range is -55 degree Celsius |
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to +125. Between 0 and 70 degree Celsius, accuracy is 0.5 Kelvin. The value |
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returned via sysfs displays post decimal positions. |
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The thermostat function works as follows: When configured via platform_data |
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(struct ds620_platform_data) .pomode == 0 (default), the thermostat output pin |
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PO is always low. If .pomode == 1, the thermostat is in PO_LOW mode. I.e., the |
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output pin PO becomes active when the temperature falls below temp1_min and |
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stays active until the temperature goes above temp1_max. |
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Likewise, with .pomode == 2, the thermostat is in PO_HIGH mode. I.e., the PO |
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output pin becomes active when the temperature goes above temp1_max and stays |
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active until the temperature falls below temp1_min. |
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The PO output pin of the DS620 operates active-low.
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