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Commit | Line | Data |
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7f15b664 RM |
1 | Kernel driver lm75 |
2 | ================== | |
3 | ||
4 | Supported chips: | |
b04f2f7d | 5 | |
7f15b664 | 6 | * National Semiconductor LM75 |
b04f2f7d | 7 | |
7f15b664 | 8 | Prefix: 'lm75' |
b04f2f7d | 9 | |
7f15b664 | 10 | Addresses scanned: I2C 0x48 - 0x4f |
b04f2f7d | 11 | |
7f15b664 | 12 | Datasheet: Publicly available at the National Semiconductor website |
b04f2f7d MCC |
13 | |
14 | http://www.national.com/ | |
15 | ||
05e82fe4 | 16 | * National Semiconductor LM75A |
b04f2f7d | 17 | |
05e82fe4 | 18 | Prefix: 'lm75a' |
b04f2f7d | 19 | |
05e82fe4 | 20 | Addresses scanned: I2C 0x48 - 0x4f |
b04f2f7d | 21 | |
05e82fe4 | 22 | Datasheet: Publicly available at the National Semiconductor website |
b04f2f7d MCC |
23 | |
24 | http://www.national.com/ | |
25 | ||
3fbc81e3 | 26 | * Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505 |
b04f2f7d | 27 | |
3fbc81e3 | 28 | Prefixes: 'ds75', 'ds1775', 'ds7505' |
b04f2f7d | 29 | |
426343ef | 30 | Addresses scanned: none |
b04f2f7d | 31 | |
3fbc81e3 | 32 | Datasheet: Publicly available at the Maxim website |
b04f2f7d | 33 | |
ad736c1a | 34 | https://www.maximintegrated.com/ |
b04f2f7d | 35 | |
a54ca77a | 36 | * Maxim MAX6625, MAX6626, MAX31725, MAX31726 |
b04f2f7d | 37 | |
a54ca77a | 38 | Prefixes: 'max6625', 'max6626', 'max31725', 'max31726' |
b04f2f7d | 39 | |
426343ef | 40 | Addresses scanned: none |
b04f2f7d | 41 | |
7f15b664 | 42 | Datasheet: Publicly available at the Maxim website |
b04f2f7d MCC |
43 | |
44 | http://www.maxim-ic.com/ | |
45 | ||
7f15b664 | 46 | * Microchip (TelCom) TCN75 |
b04f2f7d | 47 | |
25eba81b | 48 | Prefix: 'tcn75' |
b04f2f7d | 49 | |
426343ef | 50 | Addresses scanned: none |
b04f2f7d | 51 | |
426343ef | 52 | Datasheet: Publicly available at the Microchip website |
b04f2f7d MCC |
53 | |
54 | http://www.microchip.com/ | |
55 | ||
426343ef | 56 | * Microchip MCP9800, MCP9801, MCP9802, MCP9803 |
b04f2f7d | 57 | |
426343ef | 58 | Prefix: 'mcp980x' |
b04f2f7d | 59 | |
426343ef | 60 | Addresses scanned: none |
b04f2f7d | 61 | |
7f15b664 | 62 | Datasheet: Publicly available at the Microchip website |
b04f2f7d MCC |
63 | |
64 | http://www.microchip.com/ | |
65 | ||
e96f9d89 | 66 | * Analog Devices ADT75 |
b04f2f7d | 67 | |
e96f9d89 | 68 | Prefix: 'adt75' |
b04f2f7d | 69 | |
426343ef | 70 | Addresses scanned: none |
b04f2f7d | 71 | |
e96f9d89 | 72 | Datasheet: Publicly available at the Analog Devices website |
b04f2f7d | 73 | |
ad736c1a | 74 | https://www.analog.com/adt75 |
b04f2f7d | 75 | |
426343ef | 76 | * ST Microelectronics STDS75 |
b04f2f7d | 77 | |
426343ef | 78 | Prefix: 'stds75' |
b04f2f7d | 79 | |
426343ef | 80 | Addresses scanned: none |
b04f2f7d | 81 | |
426343ef | 82 | Datasheet: Publicly available at the ST website |
b04f2f7d MCC |
83 | |
84 | http://www.st.com/internet/analog/product/121769.jsp | |
85 | ||
2e9a41bb | 86 | * ST Microelectronics STLM75 |
b04f2f7d | 87 | |
2e9a41bb | 88 | Prefix: 'stlm75' |
b04f2f7d | 89 | |
2e9a41bb | 90 | Addresses scanned: none |
b04f2f7d | 91 | |
2e9a41bb | 92 | Datasheet: Publicly available at the ST website |
b04f2f7d | 93 | |
2e9a41bb | 94 | https://www.st.com/resource/en/datasheet/stlm75.pdf |
b04f2f7d | 95 | |
39abe9d8 | 96 | * Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP75B, TMP75C, TMP175, TMP275 |
b04f2f7d | 97 | |
39abe9d8 | 98 | Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75b', 'tmp75c', 'tmp275' |
b04f2f7d | 99 | |
426343ef | 100 | Addresses scanned: none |
b04f2f7d | 101 | |
426343ef | 102 | Datasheet: Publicly available at the Texas Instruments website |
b04f2f7d | 103 | |
ad736c1a | 104 | https://www.ti.com/product/tmp100 |
b04f2f7d | 105 | |
ad736c1a | 106 | https://www.ti.com/product/tmp101 |
b04f2f7d | 107 | |
ad736c1a | 108 | https://www.ti.com/product/tmp105 |
b04f2f7d | 109 | |
ad736c1a | 110 | https://www.ti.com/product/tmp112 |
b04f2f7d | 111 | |
ad736c1a | 112 | https://www.ti.com/product/tmp75 |
b04f2f7d | 113 | |
ad736c1a | 114 | https://www.ti.com/product/tmp75b |
39abe9d8 | 115 | |
ad736c1a | 116 | https://www.ti.com/product/tmp75c |
b04f2f7d | 117 | |
ad736c1a | 118 | https://www.ti.com/product/tmp175 |
b04f2f7d | 119 | |
ad736c1a | 120 | https://www.ti.com/product/tmp275 |
b04f2f7d | 121 | |
557c7ffa | 122 | * NXP LM75B, PCT2075 |
b04f2f7d | 123 | |
557c7ffa | 124 | Prefix: 'lm75b', 'pct2075' |
b04f2f7d | 125 | |
799fc602 | 126 | Addresses scanned: none |
b04f2f7d | 127 | |
799fc602 | 128 | Datasheet: Publicly available at the NXP website |
b04f2f7d | 129 | |
ad736c1a | 130 | https://www.nxp.com/documents/data_sheet/LM75B.pdf |
7f15b664 | 131 | |
ad736c1a | 132 | https://www.nxp.com/docs/en/data-sheet/PCT2075.pdf |
557c7ffa | 133 | |
7f15b664 RM |
134 | Author: Frodo Looijaard <frodol@dds.nl> |
135 | ||
136 | Description | |
137 | ----------- | |
138 | ||
139 | The LM75 implements one temperature sensor. Limits can be set through the | |
140 | Overtemperature Shutdown register and Hysteresis register. Each value can be | |
141 | set and read to half-degree accuracy. | |
142 | An alarm is issued (usually to a connected LM78) when the temperature | |
143 | gets higher then the Overtemperature Shutdown value; it stays on until | |
144 | the temperature falls below the Hysteresis value. | |
145 | All temperatures are in degrees Celsius, and are guaranteed within a | |
146 | range of -55 to +125 degrees. | |
147 | ||
0cd2c72d JD |
148 | The driver caches the values for a period varying between 1 second for the |
149 | slowest chips and 125 ms for the fastest chips; reading it more often | |
7f15b664 RM |
150 | will do no harm, but will return 'old' values. |
151 | ||
426343ef JD |
152 | The original LM75 was typically used in combination with LM78-like chips |
153 | on PC motherboards, to measure the temperature of the processor(s). Clones | |
154 | are now used in various embedded designs. | |
7f15b664 RM |
155 | |
156 | The LM75 is essentially an industry standard; there may be other | |
157 | LM75 clones not listed here, with or without various enhancements, | |
426343ef JD |
158 | that are supported. The clones are not detected by the driver, unless |
159 | they reproduce the exact register tricks of the original LM75, and must | |
a54ca77a | 160 | therefore be instantiated explicitly. Higher resolution up to 16-bit |
0cd2c72d | 161 | is supported by this driver, other specific enhancements are not. |
7f15b664 RM |
162 | |
163 | The LM77 is not supported, contrary to what we pretended for a long time. | |
164 | Both chips are simply not compatible, value encoding differs. |