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android-kvm / linux / 500bc2c1f48aa6efad9474fdbe0c7cd8d600484c / . / Documentation / hwmon / lm75.rst
blob: ba8acbd2a6cb3f0c1945e3f9fa4d5b2699fcc27e [file] [log] [blame]
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]1Kernel driver lm75
2==================
3
4Supported chips:
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]5
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]6 * National Semiconductor LM75
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]7
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]8 Prefix: 'lm75'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]9
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]10 Addresses scanned: I2C 0x48 - 0x4f
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]11
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]12 Datasheet: Publicly available at the National Semiconductor website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]13
14 http://www.national.com/
15
Len Sorensen05e82fe2011-03-21 17:59:36 +0100[diff] [blame]16 * National Semiconductor LM75A
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]17
Len Sorensen05e82fe2011-03-21 17:59:36 +0100[diff] [blame]18 Prefix: 'lm75a'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]19
Len Sorensen05e82fe2011-03-21 17:59:36 +0100[diff] [blame]20 Addresses scanned: I2C 0x48 - 0x4f
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]21
Len Sorensen05e82fe2011-03-21 17:59:36 +0100[diff] [blame]22 Datasheet: Publicly available at the National Semiconductor website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]23
24 http://www.national.com/
25
Jean Delvare3fbc81e2013-05-04 14:49:36 +0200[diff] [blame]26 * Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]27
Jean Delvare3fbc81e2013-05-04 14:49:36 +0200[diff] [blame]28 Prefixes: 'ds75', 'ds1775', 'ds7505'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]29
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]30 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]31
Jean Delvare3fbc81e2013-05-04 14:49:36 +0200[diff] [blame]32 Datasheet: Publicly available at the Maxim website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]33
34 http://www.maximintegrated.com/
35
Kun Yia54ca772018-09-11 13:25:58 -0700[diff] [blame]36 * Maxim MAX6625, MAX6626, MAX31725, MAX31726
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]37
Kun Yia54ca772018-09-11 13:25:58 -0700[diff] [blame]38 Prefixes: 'max6625', 'max6626', 'max31725', 'max31726'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]39
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]40 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]41
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]42 Datasheet: Publicly available at the Maxim website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]43
44 http://www.maxim-ic.com/
45
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]46 * Microchip (TelCom) TCN75
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]47
Jean Delvare25eba812013-03-18 21:19:49 +0100[diff] [blame]48 Prefix: 'tcn75'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]49
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]50 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]51
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]52 Datasheet: Publicly available at the Microchip website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]53
54 http://www.microchip.com/
55
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]56 * Microchip MCP9800, MCP9801, MCP9802, MCP9803
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]57
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]58 Prefix: 'mcp980x'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]59
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]60 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]61
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]62 Datasheet: Publicly available at the Microchip website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]63
64 http://www.microchip.com/
65
Michael Henneriche96f9d82011-10-13 04:43:31 -0400[diff] [blame]66 * Analog Devices ADT75
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]67
Michael Henneriche96f9d82011-10-13 04:43:31 -0400[diff] [blame]68 Prefix: 'adt75'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]69
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]70 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]71
Michael Henneriche96f9d82011-10-13 04:43:31 -0400[diff] [blame]72 Datasheet: Publicly available at the Analog Devices website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]73
74 http://www.analog.com/adt75
75
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]76 * ST Microelectronics STDS75
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]77
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]78 Prefix: 'stds75'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]79
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]80 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]81
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]82 Datasheet: Publicly available at the ST website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]83
84 http://www.st.com/internet/analog/product/121769.jsp
85
Jagan Teki2e9a41b2018-12-06 02:44:22 +0530[diff] [blame]86 * ST Microelectronics STLM75
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]87
Jagan Teki2e9a41b2018-12-06 02:44:22 +0530[diff] [blame]88 Prefix: 'stlm75'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]89
Jagan Teki2e9a41b2018-12-06 02:44:22 +0530[diff] [blame]90 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]91
Jagan Teki2e9a41b2018-12-06 02:44:22 +0530[diff] [blame]92 Datasheet: Publicly available at the ST website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]93
Jagan Teki2e9a41b2018-12-06 02:44:22 +0530[diff] [blame]94 https://www.st.com/resource/en/datasheet/stlm75.pdf
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]95
Iker Perez del Palomar Sustatxa39abe9d2019-05-03 17:15:00 +0100[diff] [blame]96 * Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP75B, TMP75C, TMP175, TMP275
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]97
Iker Perez del Palomar Sustatxa39abe9d2019-05-03 17:15:00 +0100[diff] [blame]98 Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75b', 'tmp75c', 'tmp275'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]99
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]100 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]101
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]102 Datasheet: Publicly available at the Texas Instruments website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]103
104 http://www.ti.com/product/tmp100
105
106 http://www.ti.com/product/tmp101
107
108 http://www.ti.com/product/tmp105
109
110 http://www.ti.com/product/tmp112
111
112 http://www.ti.com/product/tmp75
113
Iker Perez del Palomar Sustatxa39abe9d2019-05-03 17:15:00 +0100[diff] [blame]114 http://www.ti.com/product/tmp75b
115
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]116 http://www.ti.com/product/tmp75c
117
118 http://www.ti.com/product/tmp175
119
120 http://www.ti.com/product/tmp275
121
Michael Thalmeier799fc602014-11-18 17:08:04 +0100[diff] [blame]122 * NXP LM75B
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]123
Michael Thalmeier799fc602014-11-18 17:08:04 +0100[diff] [blame]124 Prefix: 'lm75b'
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]125
Michael Thalmeier799fc602014-11-18 17:08:04 +0100[diff] [blame]126 Addresses scanned: none
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]127
Michael Thalmeier799fc602014-11-18 17:08:04 +0100[diff] [blame]128 Datasheet: Publicly available at the NXP website
Mauro Carvalho Chehabb04f2f72019-04-17 06:46:28 -0300[diff] [blame]129
130 http://www.nxp.com/documents/data_sheet/LM75B.pdf
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]131
132Author: Frodo Looijaard <frodol@dds.nl>
133
134Description
135-----------
136
137The LM75 implements one temperature sensor. Limits can be set through the
138Overtemperature Shutdown register and Hysteresis register. Each value can be
139set and read to half-degree accuracy.
140An alarm is issued (usually to a connected LM78) when the temperature
141gets higher then the Overtemperature Shutdown value; it stays on until
142the temperature falls below the Hysteresis value.
143All temperatures are in degrees Celsius, and are guaranteed within a
144range of -55 to +125 degrees.
145
Jean Delvare0cd2c722013-05-04 14:49:36 +0200[diff] [blame]146The driver caches the values for a period varying between 1 second for the
147slowest chips and 125 ms for the fastest chips; reading it more often
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]148will do no harm, but will return 'old' values.
149
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]150The original LM75 was typically used in combination with LM78-like chips
151on PC motherboards, to measure the temperature of the processor(s). Clones
152are now used in various embedded designs.
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]153
154The LM75 is essentially an industry standard; there may be other
155LM75 clones not listed here, with or without various enhancements,
Jean Delvare426343e2011-10-13 17:15:11 -0400[diff] [blame]156that are supported. The clones are not detected by the driver, unless
157they reproduce the exact register tricks of the original LM75, and must
Kun Yia54ca772018-09-11 13:25:58 -0700[diff] [blame]158therefore be instantiated explicitly. Higher resolution up to 16-bit
Jean Delvare0cd2c722013-05-04 14:49:36 +0200[diff] [blame]159is supported by this driver, other specific enhancements are not.
R.Marek@sh.cvut.cz7f15b662005-05-26 12:42:19 +0000[diff] [blame]160
161The LM77 is not supported, contrary to what we pretended for a long time.
162Both chips are simply not compatible, value encoding differs.