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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/ | |
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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/ | |
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15 | * Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505 |
16 | Prefixes: 'ds75', 'ds1775', 'ds7505' | |
426343ef | 17 | Addresses scanned: none |
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18 | Datasheet: Publicly available at the Maxim website |
19 | http://www.maximintegrated.com/ | |
7f15b664 | 20 | * Maxim MAX6625, MAX6626 |
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21 | Prefixes: 'max6625', 'max6626' |
22 | Addresses scanned: none | |
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23 | Datasheet: Publicly available at the Maxim website |
24 | http://www.maxim-ic.com/ | |
25 | * Microchip (TelCom) TCN75 | |
25eba81b | 26 | Prefix: 'tcn75' |
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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 | |
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33 | Datasheet: Publicly available at the Microchip website |
34 | http://www.microchip.com/ | |
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35 | * Analog Devices ADT75 |
36 | Prefix: 'adt75' | |
426343ef | 37 | Addresses scanned: none |
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38 | Datasheet: Publicly available at the Analog Devices website |
39 | http://www.analog.com/adt75 | |
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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 | |
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55 | |
56 | Author: Frodo Looijaard <frodol@dds.nl> | |
57 | ||
58 | Description | |
59 | ----------- | |
60 | ||
61 | The LM75 implements one temperature sensor. Limits can be set through the | |
62 | Overtemperature Shutdown register and Hysteresis register. Each value can be | |
63 | set and read to half-degree accuracy. | |
64 | An alarm is issued (usually to a connected LM78) when the temperature | |
65 | gets higher then the Overtemperature Shutdown value; it stays on until | |
66 | the temperature falls below the Hysteresis value. | |
67 | All temperatures are in degrees Celsius, and are guaranteed within a | |
68 | range of -55 to +125 degrees. | |
69 | ||
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70 | The driver caches the values for a period varying between 1 second for the |
71 | slowest chips and 125 ms for the fastest chips; reading it more often | |
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72 | will do no harm, but will return 'old' values. |
73 | ||
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74 | The original LM75 was typically used in combination with LM78-like chips |
75 | on PC motherboards, to measure the temperature of the processor(s). Clones | |
76 | are now used in various embedded designs. | |
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77 | |
78 | The LM75 is essentially an industry standard; there may be other | |
79 | LM75 clones not listed here, with or without various enhancements, | |
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80 | that are supported. The clones are not detected by the driver, unless |
81 | they reproduce the exact register tricks of the original LM75, and must | |
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82 | therefore be instantiated explicitly. Higher resolution up to 12-bit |
83 | is supported by this driver, other specific enhancements are not. | |
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84 | |
85 | The LM77 is not supported, contrary to what we pretended for a long time. | |
86 | Both chips are simply not compatible, value encoding differs. |