mirror of
https://github.com/lm-sensors/lm-sensors.git
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Mark D. Studebaker
320aee635c
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1524 7894878c-1315-0410-8ee3-d5d059ff63e0
99 lines
3.6 KiB
Plaintext
99 lines
3.6 KiB
Plaintext
Kernel driver `lm75.o'
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=====================
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Status: Complete and well-tested
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Supported chips:
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* National Semiconductor LM75
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Prefix: `lm75'
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Addresses scanned: I2C 0x48 - 0x4f (inclusive)
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com
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* National Semiconductor LM77
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Prefix: `lm75'
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Addresses scanned: I2C 0x48 - 0x4b (inclusive)
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com
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* Dallas Semiconductor DS75
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Prefix: `lm75'
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Addresses scanned: I2C 0x48 - 0x4f (inclusive)
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Datasheet: Publicly available at the Dallas Semiconductor website
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http://www.dalsemi.com
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* Dallas Semiconductor DS1775
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Prefix: `lm75'
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Addresses scanned: I2C 0x48 - 0x4f (inclusive)
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Datasheet: Publicly available at the Dallas Semiconductor website
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http://www.dalsemi.com
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* Microchip (TelCom) TCN75
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Prefix: `lm75'
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Addresses scanned: I2C 0x48 - 0x4f (inclusive)
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Datasheet: Publicly available at the Microchip website
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http://www.microchip.com
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Author: Frodo Looijaard <frodol@dds.nl>
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Module Parameters
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-----------------
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* force: short array (min = 1, max = 48)
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List of adapter,address pairs to boldly assume to be present
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* force_lm75: short array (min = 1, max = 48)
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List of adapter,address pairs which are unquestionably assumed to contain
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a `lm75' chip
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* ignore: short array (min = 1, max = 48)
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List of adapter,address pairs not to scan
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* ignore_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples not to scan
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* probe: short array (min = 1, max = 48)
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List of adapter,address pairs to scan additionally
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* probe_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples to scan additionally
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Description
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-----------
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The LM75 implements one temperature sensor. Limits can be set through the
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Overtemperature Shutdown register and Hysteresis register. Each value can be
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set and read to half-degree accuracy.
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An alarm is issued (usually to a connected LM78) when the temperature
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gets higher then the Overtemperature Shutdown value; it stays on until
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the temperature falls below the Hysteresis value.
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All temperatures are in degrees Celcius, and are guaranteed within a
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range of -55 to +125 degrees.
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The LM75 only updates its values each 1.5 seconds; reading it more often
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will do no harm, but will return 'old' values.
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The LM75 is usually used in combination with LM78-like chips, to measure
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the temperature of the processor(s).
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The LM77 is supported as well. It is not distinguished from an LM75
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and the two additional registers in the LM77 are not supported.
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The prefix in the /proc directory is still 'lm75'.
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The DS75 and DS1775 are supported as well.
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They are not distinguished from an LM75. While these chips
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have three additional bits of accuracy (12 vs. 9 for the LM75),
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the additional bits are not supported.
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The prefix in the /proc directory is still 'lm75'.
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The TCN75 is supported as well, and is not distinguished from an LM75.
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Chip Features
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-------------
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Chip `lm75'
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LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
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temp NONE NONE R 1
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temp_hyst temp temp RW 1
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temp_over temp temp RW 1
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LABEL FEATURE SYMBOL SYSCTL FILE:OFFSET
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temp SENSORS_LM75_TEMP temp:3
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temp_hyst SENSORS_LM75_TEMP_HYST temp:2
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temp_over SENSORS_LM75_TEMP_OVER temp:1
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