0001 Kernel driver lm75
0002 ==================
0003
0004 Supported chips:
0005
0006 * National Semiconductor LM75
0007
0008 Prefix: 'lm75'
0009
0010 Addresses scanned: I2C 0x48 - 0x4f
0011
0012 Datasheet: Publicly available at the National Semiconductor website
0013
0014 http://www.national.com/
0015
0016 * National Semiconductor LM75A
0017
0018 Prefix: 'lm75a'
0019
0020 Addresses scanned: I2C 0x48 - 0x4f
0021
0022 Datasheet: Publicly available at the National Semiconductor website
0023
0024 http://www.national.com/
0025
0026 * Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
0027
0028 Prefixes: 'ds75', 'ds1775', 'ds7505'
0029
0030 Addresses scanned: none
0031
0032 Datasheet: Publicly available at the Maxim website
0033
0034 https://www.maximintegrated.com/
0035
0036 * Maxim MAX6625, MAX6626, MAX31725, MAX31726
0037
0038 Prefixes: 'max6625', 'max6626', 'max31725', 'max31726'
0039
0040 Addresses scanned: none
0041
0042 Datasheet: Publicly available at the Maxim website
0043
0044 http://www.maxim-ic.com/
0045
0046 * Microchip (TelCom) TCN75
0047
0048 Prefix: 'tcn75'
0049
0050 Addresses scanned: none
0051
0052 Datasheet: Publicly available at the Microchip website
0053
0054 http://www.microchip.com/
0055
0056 * Microchip MCP9800, MCP9801, MCP9802, MCP9803
0057
0058 Prefix: 'mcp980x'
0059
0060 Addresses scanned: none
0061
0062 Datasheet: Publicly available at the Microchip website
0063
0064 http://www.microchip.com/
0065
0066 * Analog Devices ADT75
0067
0068 Prefix: 'adt75'
0069
0070 Addresses scanned: none
0071
0072 Datasheet: Publicly available at the Analog Devices website
0073
0074 https://www.analog.com/adt75
0075
0076 * ST Microelectronics STDS75
0077
0078 Prefix: 'stds75'
0079
0080 Addresses scanned: none
0081
0082 Datasheet: Publicly available at the ST website
0083
0084 http://www.st.com/internet/analog/product/121769.jsp
0085
0086 * ST Microelectronics STLM75
0087
0088 Prefix: 'stlm75'
0089
0090 Addresses scanned: none
0091
0092 Datasheet: Publicly available at the ST website
0093
0094 https://www.st.com/resource/en/datasheet/stlm75.pdf
0095
0096 * Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP75B, TMP75C, TMP175, TMP275, TMP1075
0097
0098 Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75b', 'tmp75c', 'tmp275', 'tmp1075'
0099
0100 Addresses scanned: none
0101
0102 Datasheet: Publicly available at the Texas Instruments website
0103
0104 https://www.ti.com/product/tmp100
0105
0106 https://www.ti.com/product/tmp101
0107
0108 https://www.ti.com/product/tmp105
0109
0110 https://www.ti.com/product/tmp112
0111
0112 https://www.ti.com/product/tmp75
0113
0114 https://www.ti.com/product/tmp75b
0115
0116 https://www.ti.com/product/tmp75c
0117
0118 https://www.ti.com/product/tmp175
0119
0120 https://www.ti.com/product/tmp275
0121
0122 https://www.ti.com/product/TMP1075
0123
0124 * NXP LM75B, PCT2075
0125
0126 Prefix: 'lm75b', 'pct2075'
0127
0128 Addresses scanned: none
0129
0130 Datasheet: Publicly available at the NXP website
0131
0132 https://www.nxp.com/documents/data_sheet/LM75B.pdf
0133
0134 https://www.nxp.com/docs/en/data-sheet/PCT2075.pdf
0135
0136 Author: Frodo Looijaard <frodol@dds.nl>
0137
0138 Description
0139 -----------
0140
0141 The LM75 implements one temperature sensor. Limits can be set through the
0142 Overtemperature Shutdown register and Hysteresis register. Each value can be
0143 set and read to half-degree accuracy.
0144 An alarm is issued (usually to a connected LM78) when the temperature
0145 gets higher then the Overtemperature Shutdown value; it stays on until
0146 the temperature falls below the Hysteresis value.
0147 All temperatures are in degrees Celsius, and are guaranteed within a
0148 range of -55 to +125 degrees.
0149
0150 The driver caches the values for a period varying between 1 second for the
0151 slowest chips and 125 ms for the fastest chips; reading it more often
0152 will do no harm, but will return 'old' values.
0153
0154 The original LM75 was typically used in combination with LM78-like chips
0155 on PC motherboards, to measure the temperature of the processor(s). Clones
0156 are now used in various embedded designs.
0157
0158 The LM75 is essentially an industry standard; there may be other
0159 LM75 clones not listed here, with or without various enhancements,
0160 that are supported. The clones are not detected by the driver, unless
0161 they reproduce the exact register tricks of the original LM75, and must
0162 therefore be instantiated explicitly. Higher resolution up to 16-bit
0163 is supported by this driver, other specific enhancements are not.
0164
0165 The LM77 is not supported, contrary to what we pretended for a long time.
0166 Both chips are simply not compatible, value encoding differs.
