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