1 Kernel driver lm75 1 Kernel driver lm75
2 ================== 2 ==================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * National Semiconductor LM75 6 * National Semiconductor LM75
7 7
8 Prefix: 'lm75' 8 Prefix: 'lm75'
9 9
10 Addresses scanned: I2C 0x48 - 0x4f 10 Addresses scanned: I2C 0x48 - 0x4f
11 11
12 Datasheet: Publicly available at the Natio 12 Datasheet: Publicly available at the National Semiconductor website
13 13
14 http://www.national.com/ 14 http://www.national.com/
15 15
16 * National Semiconductor LM75A 16 * National Semiconductor LM75A
17 17
18 Prefix: 'lm75a' 18 Prefix: 'lm75a'
19 19
20 Addresses scanned: I2C 0x48 - 0x4f 20 Addresses scanned: I2C 0x48 - 0x4f
21 21
22 Datasheet: Publicly available at the Natio 22 Datasheet: Publicly available at the National Semiconductor website
23 23
24 http://www.national.com/ 24 http://www.national.com/
25 25
26 * Dallas Semiconductor (now Maxim) DS75, DS1 26 * Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
27 27
28 Prefixes: 'ds75', 'ds1775', 'ds7505' 28 Prefixes: 'ds75', 'ds1775', 'ds7505'
29 29
30 Addresses scanned: none 30 Addresses scanned: none
31 31
32 Datasheet: Publicly available at the Maxim 32 Datasheet: Publicly available at the Maxim website
33 33
34 https://www.maximintegrated.com 34 https://www.maximintegrated.com/
35 35
36 * Maxim MAX6625, MAX6626, MAX31725, MAX31726 36 * Maxim MAX6625, MAX6626, MAX31725, MAX31726
37 37
38 Prefixes: 'max6625', 'max6626', 'max31725' 38 Prefixes: 'max6625', 'max6626', 'max31725', 'max31726'
39 39
40 Addresses scanned: none 40 Addresses scanned: none
41 41
42 Datasheet: Publicly available at the Maxim 42 Datasheet: Publicly available at the Maxim website
43 43
44 http://www.maxim-ic.com/ 44 http://www.maxim-ic.com/
45 45
46 * Microchip (TelCom) TCN75 46 * Microchip (TelCom) TCN75
47 47
48 Prefix: 'tcn75' 48 Prefix: 'tcn75'
49 49
50 Addresses scanned: none 50 Addresses scanned: none
51 51
52 Datasheet: Publicly available at the Micro 52 Datasheet: Publicly available at the Microchip website
53 53
54 http://www.microchip.com/ 54 http://www.microchip.com/
55 55
56 * Microchip MCP9800, MCP9801, MCP9802, MCP98 56 * Microchip MCP9800, MCP9801, MCP9802, MCP9803
57 57
58 Prefix: 'mcp980x' 58 Prefix: 'mcp980x'
59 59
60 Addresses scanned: none 60 Addresses scanned: none
61 61
62 Datasheet: Publicly available at the Micro 62 Datasheet: Publicly available at the Microchip website
63 63
64 http://www.microchip.com/ 64 http://www.microchip.com/
65 65
66 * Analog Devices ADT75 66 * Analog Devices ADT75
67 67
68 Prefix: 'adt75' 68 Prefix: 'adt75'
69 69
70 Addresses scanned: none 70 Addresses scanned: none
71 71
72 Datasheet: Publicly available at the Analo 72 Datasheet: Publicly available at the Analog Devices website
73 73
74 https://www.analog.com/adt75 74 https://www.analog.com/adt75
75 75
76 * ST Microelectronics STDS75 76 * ST Microelectronics STDS75
77 77
78 Prefix: 'stds75' 78 Prefix: 'stds75'
79 79
80 Addresses scanned: none 80 Addresses scanned: none
81 81
82 Datasheet: Publicly available at the ST we 82 Datasheet: Publicly available at the ST website
83 83
84 http://www.st.com/internet/anal 84 http://www.st.com/internet/analog/product/121769.jsp
85 85
86 * ST Microelectronics STLM75 86 * ST Microelectronics STLM75
87 87
88 Prefix: 'stlm75' 88 Prefix: 'stlm75'
89 89
90 Addresses scanned: none 90 Addresses scanned: none
91 91
92 Datasheet: Publicly available at the ST we 92 Datasheet: Publicly available at the ST website
93 93
94 https://www.st.com/resource/en/ 94 https://www.st.com/resource/en/datasheet/stlm75.pdf
95 95
96 * Texas Instruments TMP100, TMP101, TMP105, !! 96 * Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP75B, TMP75C, TMP175, TMP275
97 97
98 Prefixes: 'tmp100', 'tmp101', 'tmp105', 't !! 98 Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75b', 'tmp75c', 'tmp275'
99 99
100 Addresses scanned: none 100 Addresses scanned: none
101 101
102 Datasheet: Publicly available at the Texas 102 Datasheet: Publicly available at the Texas Instruments website
103 103
104 https://www.ti.com/product/tmp1 104 https://www.ti.com/product/tmp100
105 105
106 https://www.ti.com/product/tmp1 106 https://www.ti.com/product/tmp101
107 107
108 https://www.ti.com/product/tmp1 108 https://www.ti.com/product/tmp105
109 109
110 https://www.ti.com/product/tmp1 110 https://www.ti.com/product/tmp112
111 111
112 https://www.ti.com/product/tmp7 112 https://www.ti.com/product/tmp75
113 113
114 https://www.ti.com/product/tmp7 114 https://www.ti.com/product/tmp75b
115 115
116 https://www.ti.com/product/tmp7 116 https://www.ti.com/product/tmp75c
117 117
118 https://www.ti.com/product/tmp1 118 https://www.ti.com/product/tmp175
119 119
120 https://www.ti.com/product/tmp2 120 https://www.ti.com/product/tmp275
121 121
122 https://www.ti.com/product/TMP1075 <<
123 <<
124 * NXP LM75B, PCT2075 122 * NXP LM75B, PCT2075
125 123
126 Prefix: 'lm75b', 'pct2075' 124 Prefix: 'lm75b', 'pct2075'
127 125
128 Addresses scanned: none 126 Addresses scanned: none
129 127
130 Datasheet: Publicly available at the NXP w 128 Datasheet: Publicly available at the NXP website
131 129
132 https://www.nxp.com/documents/d 130 https://www.nxp.com/documents/data_sheet/LM75B.pdf
133 131
134 https://www.nxp.com/docs/en/dat 132 https://www.nxp.com/docs/en/data-sheet/PCT2075.pdf
135 <<
136 * AMS OSRAM AS6200 <<
137 <<
138 Prefix: 'as6200' <<
139 <<
140 Addresses scanned: none <<
141 <<
142 Datasheet: Publicly available at the AMS w <<
143 <<
144 https://ams.com/documents/20143 <<
145 133
146 Author: Frodo Looijaard <frodol@dds.nl> 134 Author: Frodo Looijaard <frodol@dds.nl>
147 135
148 Description 136 Description
149 ----------- 137 -----------
150 138
151 The LM75 implements one temperature sensor. Li 139 The LM75 implements one temperature sensor. Limits can be set through the
152 Overtemperature Shutdown register and Hysteres 140 Overtemperature Shutdown register and Hysteresis register. Each value can be
153 set and read to half-degree accuracy. 141 set and read to half-degree accuracy.
154 An alarm is issued (usually to a connected LM7 142 An alarm is issued (usually to a connected LM78) when the temperature
155 gets higher then the Overtemperature Shutdown 143 gets higher then the Overtemperature Shutdown value; it stays on until
156 the temperature falls below the Hysteresis val 144 the temperature falls below the Hysteresis value.
157 All temperatures are in degrees Celsius, and a 145 All temperatures are in degrees Celsius, and are guaranteed within a
158 range of -55 to +125 degrees. 146 range of -55 to +125 degrees.
159 147
160 The driver caches the values for a period vary 148 The driver caches the values for a period varying between 1 second for the
161 slowest chips and 125 ms for the fastest chips 149 slowest chips and 125 ms for the fastest chips; reading it more often
162 will do no harm, but will return 'old' values. 150 will do no harm, but will return 'old' values.
163 151
164 The original LM75 was typically used in combin 152 The original LM75 was typically used in combination with LM78-like chips
165 on PC motherboards, to measure the temperature 153 on PC motherboards, to measure the temperature of the processor(s). Clones
166 are now used in various embedded designs. 154 are now used in various embedded designs.
167 155
168 The LM75 is essentially an industry standard; 156 The LM75 is essentially an industry standard; there may be other
169 LM75 clones not listed here, with or without v 157 LM75 clones not listed here, with or without various enhancements,
170 that are supported. The clones are not detecte 158 that are supported. The clones are not detected by the driver, unless
171 they reproduce the exact register tricks of th 159 they reproduce the exact register tricks of the original LM75, and must
172 therefore be instantiated explicitly. Higher r 160 therefore be instantiated explicitly. Higher resolution up to 16-bit
173 is supported by this driver, other specific en 161 is supported by this driver, other specific enhancements are not.
174 162
175 The LM77 is not supported, contrary to what we 163 The LM77 is not supported, contrary to what we pretended for a long time.
176 Both chips are simply not compatible, value en 164 Both chips are simply not compatible, value encoding differs.
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