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author | Jean Delvare <khali@linux-fr.org> | 2005-07-02 18:52:48 +0200 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-07-11 14:47:41 -0700 |
commit | ede7fbdf526c314850c9f32dd8da1753bf8d0ad5 (patch) | |
tree | 2f1fefa6f6df58f5c27bf98bd7df0908e97e44ef /Documentation/hwmon/lm75 | |
parent | 8d5d45fb14680326f833295f2316a4ec5e357220 (diff) | |
download | kernel_samsung_espresso10-ede7fbdf526c314850c9f32dd8da1753bf8d0ad5.zip kernel_samsung_espresso10-ede7fbdf526c314850c9f32dd8da1753bf8d0ad5.tar.gz kernel_samsung_espresso10-ede7fbdf526c314850c9f32dd8da1753bf8d0ad5.tar.bz2 |
[PATCH] I2C: Move hwmon drivers (3/3)
Part 3: Move the drivers documentation, plus two general documentation
files.
Note that the patch "adds trailing whitespace", because it does move the
files as-is, and some files happen to have trailing whitespace.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/hwmon/lm75')
-rw-r--r-- | Documentation/hwmon/lm75 | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/Documentation/hwmon/lm75 b/Documentation/hwmon/lm75 new file mode 100644 index 0000000..8e6356f --- /dev/null +++ b/Documentation/hwmon/lm75 @@ -0,0 +1,65 @@ +Kernel driver lm75 +================== + +Supported chips: + * National Semiconductor LM75 + Prefix: 'lm75' + Addresses scanned: I2C 0x48 - 0x4f + Datasheet: Publicly available at the National Semiconductor website + http://www.national.com/ + * Dallas Semiconductor DS75 + Prefix: 'lm75' + Addresses scanned: I2C 0x48 - 0x4f + Datasheet: Publicly available at the Dallas Semiconductor website + http://www.maxim-ic.com/ + * Dallas Semiconductor DS1775 + Prefix: 'lm75' + Addresses scanned: I2C 0x48 - 0x4f + Datasheet: Publicly available at the Dallas Semiconductor website + http://www.maxim-ic.com/ + * Maxim MAX6625, MAX6626 + Prefix: 'lm75' + Addresses scanned: I2C 0x48 - 0x4b + Datasheet: Publicly available at the Maxim website + http://www.maxim-ic.com/ + * Microchip (TelCom) TCN75 + Prefix: 'lm75' + Addresses scanned: I2C 0x48 - 0x4f + Datasheet: Publicly available at the Microchip website + http://www.microchip.com/ + +Author: Frodo Looijaard <frodol@dds.nl> + +Description +----------- + +The LM75 implements one temperature sensor. Limits can be set through the +Overtemperature Shutdown register and Hysteresis register. Each value can be +set and read to half-degree accuracy. +An alarm is issued (usually to a connected LM78) when the temperature +gets higher then the Overtemperature Shutdown value; it stays on until +the temperature falls below the Hysteresis value. +All temperatures are in degrees Celsius, and are guaranteed within a +range of -55 to +125 degrees. + +The LM75 only updates its values each 1.5 seconds; reading it more often +will do no harm, but will return 'old' values. + +The LM75 is usually used in combination with LM78-like chips, to measure +the temperature of the processor(s). + +The DS75, DS1775, MAX6625, and MAX6626 are supported as well. +They are not distinguished from an LM75. While most of these chips +have three additional bits of accuracy (12 vs. 9 for the LM75), +the additional bits are not supported. Not only that, but these chips will +not be detected if not in 9-bit precision mode (use the force parameter if +needed). + +The TCN75 is supported as well, and is not distinguished from an LM75. + +The LM75 is essentially an industry standard; there may be other +LM75 clones not listed here, with or without various enhancements, +that are supported. + +The LM77 is not supported, contrary to what we pretended for a long time. +Both chips are simply not compatible, value encoding differs. |