Based on kernel version 3.19. Page generated on 2015-02-13 21:21 EST.
1 Kernel driver lm75 2 ================== 3 4 Supported 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 (now Maxim) DS75, DS1775, DS7505 16 Prefixes: 'ds75', 'ds1775', 'ds7505' 17 Addresses scanned: none 18 Datasheet: Publicly available at the Maxim website 19 http://www.maximintegrated.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: 'tcn75' 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, TMP112, TMP75, TMP175, TMP275 46 Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', '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/tmp112 53 http://www.ti.com/product/tmp75 54 http://www.ti.com/product/tmp175 55 http://www.ti.com/product/tmp275 56 * NXP LM75B 57 Prefix: 'lm75b' 58 Addresses scanned: none 59 Datasheet: Publicly available at the NXP website 60 http://www.nxp.com/documents/data_sheet/LM75B.pdf 61 62 Author: Frodo Looijaard <firstname.lastname@example.org> 63 64 Description 65 ----------- 66 67 The LM75 implements one temperature sensor. Limits can be set through the 68 Overtemperature Shutdown register and Hysteresis register. Each value can be 69 set and read to half-degree accuracy. 70 An alarm is issued (usually to a connected LM78) when the temperature 71 gets higher then the Overtemperature Shutdown value; it stays on until 72 the temperature falls below the Hysteresis value. 73 All temperatures are in degrees Celsius, and are guaranteed within a 74 range of -55 to +125 degrees. 75 76 The driver caches the values for a period varying between 1 second for the 77 slowest chips and 125 ms for the fastest chips; reading it more often 78 will do no harm, but will return 'old' values. 79 80 The original LM75 was typically used in combination with LM78-like chips 81 on PC motherboards, to measure the temperature of the processor(s). Clones 82 are now used in various embedded designs. 83 84 The LM75 is essentially an industry standard; there may be other 85 LM75 clones not listed here, with or without various enhancements, 86 that are supported. The clones are not detected by the driver, unless 87 they reproduce the exact register tricks of the original LM75, and must 88 therefore be instantiated explicitly. Higher resolution up to 12-bit 89 is supported by this driver, other specific enhancements are not. 90 91 The LM77 is not supported, contrary to what we pretended for a long time. 92 Both chips are simply not compatible, value encoding differs.