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 * Dallas Semiconductor DS75 11 Prefix: 'lm75' 12 Addresses scanned: I2C 0x48 - 0x4f 13 Datasheet: Publicly available at the Dallas Semiconductor website 14 http://www.maxim-ic.com/ 15 * Dallas Semiconductor DS1775 16 Prefix: 'lm75' 17 Addresses scanned: I2C 0x48 - 0x4f 18 Datasheet: Publicly available at the Dallas Semiconductor website 19 http://www.maxim-ic.com/ 20 * Maxim MAX6625, MAX6626 21 Prefix: 'lm75' 22 Addresses scanned: I2C 0x48 - 0x4b 23 Datasheet: Publicly available at the Maxim website 24 http://www.maxim-ic.com/ 25 * Microchip (TelCom) TCN75 26 Prefix: 'lm75' 27 Addresses scanned: I2C 0x48 - 0x4f 28 Datasheet: Publicly available at the Microchip website 29 http://www.microchip.com/ 30 31Author: Frodo Looijaard <frodol@dds.nl> 32 33Description 34----------- 35 36The LM75 implements one temperature sensor. Limits can be set through the 37Overtemperature Shutdown register and Hysteresis register. Each value can be 38set and read to half-degree accuracy. 39An alarm is issued (usually to a connected LM78) when the temperature 40gets higher then the Overtemperature Shutdown value; it stays on until 41the temperature falls below the Hysteresis value. 42All temperatures are in degrees Celsius, and are guaranteed within a 43range of -55 to +125 degrees. 44 45The LM75 only updates its values each 1.5 seconds; reading it more often 46will do no harm, but will return 'old' values. 47 48The LM75 is usually used in combination with LM78-like chips, to measure 49the temperature of the processor(s). 50 51The DS75, DS1775, MAX6625, and MAX6626 are supported as well. 52They are not distinguished from an LM75. While most of these chips 53have three additional bits of accuracy (12 vs. 9 for the LM75), 54the additional bits are not supported. Not only that, but these chips will 55not be detected if not in 9-bit precision mode (use the force parameter if 56needed). 57 58The TCN75 is supported as well, and is not distinguished from an LM75. 59 60The LM75 is essentially an industry standard; there may be other 61LM75 clones not listed here, with or without various enhancements, 62that are supported. 63 64The LM77 is not supported, contrary to what we pretended for a long time. 65Both chips are simply not compatible, value encoding differs. 66