w1/slaves/w1_therm.rst

16 -----------
47 time required by parasited powered device on the line. Reading
49 -1 if at least one sensor still in conversion, 1 if conversion is complete
55 time of issue of the bulk read command (not the current temperature).
59 ``conv_time`` is used to get current conversion time (read), and
60 adjust it (write). A temperature conversion time depends on the device type and
61 its current resolution. Default conversion time is set by the driver according
62 to the device datasheet. A conversion time for many original device clones
63 deviate from datasheet specs. There are three options: 1) manually set the
64 correct conversion time by writing a value in milliseconds to ``conv_time``; 2)
65 auto measure and set a conversion time by writing ``1`` to
68 the default conversion time write ``0`` to ``conv_time``.
72 the sensor. Resolution is reset when the sensor gets power-cycled.
81 Some non-genuine DS18B20 chips are fixed in 12-bit mode only, so the actual
84 Note: Changing the resolution reverts the conversion time to default.
86 The write-only sysfs entry ``eeprom_cmd`` is an alternative for EEPROM operations.
93 Sysfs ``alarms`` allow read or write TH and TL (Temperature High an Low) alarms.
94 Values shall be space separated and in the device range (typical -55 degC
96 the device. Lowest value is automatically put to TL. Once set, alarms could
99 The module parameter strong_pullup can be set to 0 to disable the
106 be force-enabled.
118 location of the chip in the 1-wire bus without needing pre-existing
125 time may lead to conversion failure. Original DS18B20 and some clones allow for
133 Documentation/ABI/testing/sysfs-driver-w1_therm
136 compatible with DS18B20. Added are lowest 2\ :sup:`-5`, 2\ :sup:`-6` temperature
138 resolutions. The device is powered up in 14-bit resolution mode. The conversion
144 indicating 15, but the device is always operating in 14-bit resolution mode.