| | 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, TMP75C, TMP175, TMP275 |
| | 46 | Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75c', '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/tmp75c |
| | 55 | http://www.ti.com/product/tmp175 |
| | 56 | http://www.ti.com/product/tmp275 |
| | 57 | * NXP LM75B |
| | 58 | Prefix: 'lm75b' |
| | 59 | Addresses scanned: none |
| | 60 | Datasheet: Publicly available at the NXP website |
| | 61 | http://www.nxp.com/documents/data_sheet/LM75B.pdf |
| | 62 | |
| | 63 | Author: Frodo Looijaard <frodol@dds.nl> |
| | 64 | |
| | 65 | Description |
| | 66 | ----------- |
| | 67 | |
| | 68 | The LM75 implements one temperature sensor. Limits can be set through the |
| | 69 | Overtemperature Shutdown register and Hysteresis register. Each value can be |
| | 70 | set and read to half-degree accuracy. |
| | 71 | An alarm is issued (usually to a connected LM78) when the temperature |
| | 72 | gets higher then the Overtemperature Shutdown value; it stays on until |
| | 73 | the temperature falls below the Hysteresis value. |
| | 74 | All temperatures are in degrees Celsius, and are guaranteed within a |
| | 75 | range of -55 to +125 degrees. |
| | 76 | |
| | 77 | The driver caches the values for a period varying between 1 second for the |
| | 78 | slowest chips and 125 ms for the fastest chips; reading it more often |
| | 79 | will do no harm, but will return 'old' values. |
| | 80 | |
| | 81 | The original LM75 was typically used in combination with LM78-like chips |
| | 82 | on PC motherboards, to measure the temperature of the processor(s). Clones |
| | 83 | are now used in various embedded designs. |
| | 84 | |
| | 85 | The LM75 is essentially an industry standard; there may be other |
| | 86 | LM75 clones not listed here, with or without various enhancements, |
| | 87 | that are supported. The clones are not detected by the driver, unless |
| | 88 | they reproduce the exact register tricks of the original LM75, and must |
| | 89 | therefore be instantiated explicitly. Higher resolution up to 12-bit |
| | 90 | is supported by this driver, other specific enhancements are not. |
| | 91 | |
| | 92 | The LM77 is not supported, contrary to what we pretended for a long time. |
| | 93 | Both chips are simply not compatible, value encoding differs. |
projects / mirror_ubuntu-artful-kernel.git / blame_incremental