| 1 | Kernel driver lm75 |
| 2 | ================== |
| 3 | |
| 4 | Supported 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 | http://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 | http://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 |
| 97 | |
| 98 | Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75b', 'tmp75c', 'tmp275' |
| 99 | |
| 100 | Addresses scanned: none |
| 101 | |
| 102 | Datasheet: Publicly available at the Texas Instruments website |
| 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 | |
| 114 | http://www.ti.com/product/tmp75b |
| 115 | |
| 116 | http://www.ti.com/product/tmp75c |
| 117 | |
| 118 | http://www.ti.com/product/tmp175 |
| 119 | |
| 120 | http://www.ti.com/product/tmp275 |
| 121 | |
| 122 | * NXP LM75B, PCT2075 |
| 123 | |
| 124 | Prefix: 'lm75b', 'pct2075' |
| 125 | |
| 126 | Addresses scanned: none |
| 127 | |
| 128 | Datasheet: Publicly available at the NXP website |
| 129 | |
| 130 | http://www.nxp.com/documents/data_sheet/LM75B.pdf |
| 131 | |
| 132 | http://www.nxp.com/docs/en/data-sheet/PCT2075.pdf |
| 133 | |
| 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 | |
| 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 |
| 150 | will do no harm, but will return 'old' values. |
| 151 | |
| 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. |
| 155 | |
| 156 | The LM75 is essentially an industry standard; there may be other |
| 157 | LM75 clones not listed here, with or without various enhancements, |
| 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 |
| 160 | therefore be instantiated explicitly. Higher resolution up to 16-bit |
| 161 | is supported by this driver, other specific enhancements are not. |
| 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. |