1Kernel driver lm75 2================== 3 4Supported chips: 5 6 * National Semiconductor LM75 7 8 Prefix: 'lm75' 9 10 Addresses scanned: I2C 0x48 - 0x4f 11 12 Datasheet: Publicly available at the National Semiconductor website 13 14 http://www.national.com/ 15 16 * National Semiconductor LM75A 17 18 Prefix: 'lm75a' 19 20 Addresses scanned: I2C 0x48 - 0x4f 21 22 Datasheet: Publicly available at the National Semiconductor website 23 24 http://www.national.com/ 25 26 * Dallas Semiconductor (now Analog Devices) DS75, DS1775, DS7505 27 28 Prefixes: 'ds75', 'ds1775', 'ds7505' 29 30 Addresses scanned: none 31 32 Datasheets: 33 34 https://www.analog.com/media/en/technical-documentation/data-sheets/DS75.pdf 35 https://www.analog.com/media/en/technical-documentation/data-sheets/DS1775.pdf 36 https://www.analog.com/media/en/technical-documentation/data-sheets/DS7505.pdf 37 38 * Maxim MAX6625, MAX6626, MAX31725, MAX31726 39 40 Prefixes: 'max6625', 'max6626', 'max31725', 'max31726' 41 42 Addresses scanned: none 43 44 Datasheets: 45 46 https://www.analog.com/media/en/technical-documentation/data-sheets/MAX6625-MAX6626.pdf 47 https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31725-MAX31726.pdf 48 49 * Microchip (TelCom) TCN75 50 51 Prefix: 'tcn75' 52 53 Addresses scanned: none 54 55 Datasheet: Publicly available at the Microchip website 56 57 http://www.microchip.com/ 58 59 * Microchip MCP9800, MCP9801, MCP9802, MCP9803 60 61 Prefix: 'mcp980x' 62 63 Addresses scanned: none 64 65 Datasheet: Publicly available at the Microchip website 66 67 http://www.microchip.com/ 68 69 * Analog Devices ADT75 70 71 Prefix: 'adt75' 72 73 Addresses scanned: none 74 75 Datasheet: Publicly available at the Analog Devices website 76 77 https://www.analog.com/adt75 78 79 * ST Microelectronics STDS75 80 81 Prefix: 'stds75' 82 83 Addresses scanned: none 84 85 Datasheet: Publicly available at the ST website 86 87 http://www.st.com/internet/analog/product/121769.jsp 88 89 * ST Microelectronics STLM75 90 91 Prefix: 'stlm75' 92 93 Addresses scanned: none 94 95 Datasheet: Publicly available at the ST website 96 97 https://www.st.com/resource/en/datasheet/stlm75.pdf 98 99 * Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP75B, TMP75C, TMP175, TMP275, TMP1075 100 101 Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75b', 'tmp75c', 'tmp275', 'tmp1075' 102 103 Addresses scanned: none 104 105 Datasheet: Publicly available at the Texas Instruments website 106 107 https://www.ti.com/product/tmp100 108 109 https://www.ti.com/product/tmp101 110 111 https://www.ti.com/product/tmp105 112 113 https://www.ti.com/product/tmp112 114 115 https://www.ti.com/product/tmp75 116 117 https://www.ti.com/product/tmp75b 118 119 https://www.ti.com/product/tmp75c 120 121 https://www.ti.com/product/tmp175 122 123 https://www.ti.com/product/tmp275 124 125 https://www.ti.com/product/TMP1075 126 127 * NXP LM75B, P3T1750, P3T1755, PCT2075 128 129 Prefix: 'lm75b', 'p3t1750', 'p3t1755', 'pct2075' 130 131 Addresses scanned: none 132 133 Datasheet: Publicly available at the NXP website 134 135 https://www.nxp.com/docs/en/data-sheet/LM75B.pdf 136 137 https://www.nxp.com/docs/en/data-sheet/P3T1750DP.pdf 138 139 https://www.nxp.com/docs/en/data-sheet/P3T1755.pdf 140 141 https://www.nxp.com/docs/en/data-sheet/PCT2075.pdf 142 143 * AMS OSRAM AS6200 144 145 Prefix: 'as6200' 146 147 Addresses scanned: none 148 149 Datasheet: Publicly available at the AMS website 150 151 https://ams.com/documents/20143/36005/AS6200_DS000449_4-00.pdf 152 153Author: Frodo Looijaard <frodol@dds.nl> 154 155Description 156----------- 157 158The LM75 implements one temperature sensor. Limits can be set through the 159Overtemperature Shutdown register and Hysteresis register. Each value can be 160set and read to half-degree accuracy. 161An alarm is issued (usually to a connected LM78) when the temperature 162gets higher then the Overtemperature Shutdown value; it stays on until 163the temperature falls below the Hysteresis value. 164All temperatures are in degrees Celsius, and are guaranteed within a 165range of -55 to +125 degrees. 166 167The driver caches the values for a period varying between 1 second for the 168slowest chips and 125 ms for the fastest chips; reading it more often 169will do no harm, but will return 'old' values. 170 171The original LM75 was typically used in combination with LM78-like chips 172on PC motherboards, to measure the temperature of the processor(s). Clones 173are now used in various embedded designs. 174 175The LM75 is essentially an industry standard; there may be other 176LM75 clones not listed here, with or without various enhancements, 177that are supported. The clones are not detected by the driver, unless 178they reproduce the exact register tricks of the original LM75, and must 179therefore be instantiated explicitly. Higher resolution up to 16-bit 180is supported by this driver, other specific enhancements are not. 181 182The LM77 is not supported, contrary to what we pretended for a long time. 183Both chips are simply not compatible, value encoding differs. 184