w1/slaves/w1_therm.rst

7   * Maxim ds18*20 based temperature sensors.
8   * Maxim ds1825 based temperature sensors.
9   * GXCAS GC20MH01 temperature sensor.
15 -----------
17 w1_therm provides basic temperature conversion for ds18*20, ds28ea00, GX20MH01
31 read sequence will initiate a temperature conversion, then provide two
35 displays the retained values along with a temperature in millidegrees
38 Alternatively, temperature can be read using ``temperature`` sysfs, it
39 returns only the temperature in millidegrees Centigrade.
48 -1 if at least one sensor still in conversion, 1 if conversion is complete
49 but at least one sensor value has not been read yet. Result temperature is
50 then accessed by reading the ``temperature`` entry of each device, which
53 ``temperature`` on this device will return the temperature measured at the
54 time of issue of the bulk read command (not the current temperature).
59 adjust it (write). A temperature conversion time depends on the device type and
71 the sensor. Resolution is reset when the sensor gets power-cycled.
80 Some non-genuine DS18B20 chips are fixed in 12-bit mode only, so the actual
85 The write-only sysfs entry ``eeprom`` is an alternative for EEPROM operations.
92 Sysfs ``alarms`` allow read or write TH and TL (Temperature High an Low) alarms.
93 Values shall be space separated and in the device range (typical -55 degC
105 be force-enabled.
110 resistor).  The DS18b20 temperature sensor specification lists a
117 location of the chip in the 1-wire bus without needing pre-existing
127 conversion and temperature reads 85.00 (powerup value) or 127.94 (insufficient
132 Documentation/ABI/testing/sysfs-driver-w1_therm
135 compatible with DS18B20. Added are lowest 2\ :sup:`-5`, 2\ :sup:`-6` temperature
137 resolutions. The device is powered up in 14-bit resolution mode. The conversion