linux/Documentation/hwmon/lm75
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   1Kernel driver lm75
   2==================
   3
   4Supported chips:
   5  * National Semiconductor LM75
   6    Prefix: 'lm75'
   7    Addresses scanned: I2C 0x48 - 0x4f
   8    Datasheet: Publicly available at the National Semiconductor website
   9               http://www.national.com/
  10  * National Semiconductor LM75A
  11    Prefix: 'lm75a'
  12    Addresses scanned: I2C 0x48 - 0x4f
  13    Datasheet: Publicly available at the National Semiconductor website
  14               http://www.national.com/
  15  * Dallas Semiconductor DS75, DS1775
  16    Prefixes: 'ds75', 'ds1775'
  17    Addresses scanned: none
  18    Datasheet: Publicly available at the Dallas Semiconductor website
  19               http://www.maxim-ic.com/
  20  * Maxim MAX6625, MAX6626
  21    Prefixes: 'max6625', 'max6626'
  22    Addresses scanned: none
  23    Datasheet: Publicly available at the Maxim website
  24               http://www.maxim-ic.com/
  25  * Microchip (TelCom) TCN75
  26    Prefix: 'lm75'
  27    Addresses scanned: none
  28    Datasheet: Publicly available at the Microchip website
  29               http://www.microchip.com/
  30  * Microchip MCP9800, MCP9801, MCP9802, MCP9803
  31    Prefix: 'mcp980x'
  32    Addresses scanned: none
  33    Datasheet: Publicly available at the Microchip website
  34               http://www.microchip.com/
  35  * Analog Devices ADT75
  36    Prefix: 'adt75'
  37    Addresses scanned: none
  38    Datasheet: Publicly available at the Analog Devices website
  39               http://www.analog.com/adt75
  40  * ST Microelectronics STDS75
  41    Prefix: 'stds75'
  42    Addresses scanned: none
  43    Datasheet: Publicly available at the ST website
  44               http://www.st.com/internet/analog/product/121769.jsp
  45  * Texas Instruments TMP100, TMP101, TMP105, TMP75, TMP175, TMP275
  46    Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp175', 'tmp75', 'tmp275'
  47    Addresses scanned: none
  48    Datasheet: Publicly available at the Texas Instruments website
  49               http://www.ti.com/product/tmp100
  50               http://www.ti.com/product/tmp101
  51               http://www.ti.com/product/tmp105
  52               http://www.ti.com/product/tmp75
  53               http://www.ti.com/product/tmp175
  54               http://www.ti.com/product/tmp275
  55
  56Author: Frodo Looijaard <frodol@dds.nl>
  57
  58Description
  59-----------
  60
  61The LM75 implements one temperature sensor. Limits can be set through the
  62Overtemperature Shutdown register and Hysteresis register. Each value can be
  63set and read to half-degree accuracy.
  64An alarm is issued (usually to a connected LM78) when the temperature
  65gets higher then the Overtemperature Shutdown value; it stays on until
  66the temperature falls below the Hysteresis value.
  67All temperatures are in degrees Celsius, and are guaranteed within a
  68range of -55 to +125 degrees.
  69
  70The LM75 only updates its values each 1.5 seconds; reading it more often
  71will do no harm, but will return 'old' values.
  72
  73The original LM75 was typically used in combination with LM78-like chips
  74on PC motherboards, to measure the temperature of the processor(s). Clones
  75are now used in various embedded designs.
  76
  77The LM75 is essentially an industry standard; there may be other
  78LM75 clones not listed here, with or without various enhancements,
  79that are supported. The clones are not detected by the driver, unless
  80they reproduce the exact register tricks of the original LM75, and must
  81therefore be instantiated explicitly. The specific enhancements (such as
  82higher resolution) are not currently supported by the driver.
  83
  84The LM77 is not supported, contrary to what we pretended for a long time.
  85Both chips are simply not compatible, value encoding differs.
  86
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