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- Kernel driver lm75
- ==================
- Supported chips:
- * National Semiconductor LM75
- Prefix: 'lm75'
- Addresses scanned: I2C 0x48 - 0x4f
- Datasheet: Publicly available at the National Semiconductor website
- http://www.national.com/
- * National Semiconductor LM75A
- Prefix: 'lm75a'
- Addresses scanned: I2C 0x48 - 0x4f
- Datasheet: Publicly available at the National Semiconductor website
- http://www.national.com/
- * Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
- Prefixes: 'ds75', 'ds1775', 'ds7505'
- Addresses scanned: none
- Datasheet: Publicly available at the Maxim website
- http://www.maximintegrated.com/
- * Maxim MAX6625, MAX6626
- Prefixes: 'max6625', 'max6626'
- Addresses scanned: none
- Datasheet: Publicly available at the Maxim website
- http://www.maxim-ic.com/
- * Microchip (TelCom) TCN75
- Prefix: 'tcn75'
- Addresses scanned: none
- Datasheet: Publicly available at the Microchip website
- http://www.microchip.com/
- * Microchip MCP9800, MCP9801, MCP9802, MCP9803
- Prefix: 'mcp980x'
- Addresses scanned: none
- Datasheet: Publicly available at the Microchip website
- http://www.microchip.com/
- * Analog Devices ADT75
- Prefix: 'adt75'
- Addresses scanned: none
- Datasheet: Publicly available at the Analog Devices website
- http://www.analog.com/adt75
- * ST Microelectronics STDS75
- Prefix: 'stds75'
- Addresses scanned: none
- Datasheet: Publicly available at the ST website
- http://www.st.com/internet/analog/product/121769.jsp
- * Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP75C, TMP175, TMP275
- Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75c', 'tmp275'
- Addresses scanned: none
- Datasheet: Publicly available at the Texas Instruments website
- http://www.ti.com/product/tmp100
- http://www.ti.com/product/tmp101
- http://www.ti.com/product/tmp105
- http://www.ti.com/product/tmp112
- http://www.ti.com/product/tmp75
- http://www.ti.com/product/tmp75c
- http://www.ti.com/product/tmp175
- http://www.ti.com/product/tmp275
- * NXP LM75B
- Prefix: 'lm75b'
- Addresses scanned: none
- Datasheet: Publicly available at the NXP website
- http://www.nxp.com/documents/data_sheet/LM75B.pdf
- Author: Frodo Looijaard <frodol@dds.nl>
- Description
- -----------
- The LM75 implements one temperature sensor. Limits can be set through the
- Overtemperature Shutdown register and Hysteresis register. Each value can be
- set and read to half-degree accuracy.
- An alarm is issued (usually to a connected LM78) when the temperature
- gets higher then the Overtemperature Shutdown value; it stays on until
- the temperature falls below the Hysteresis value.
- All temperatures are in degrees Celsius, and are guaranteed within a
- range of -55 to +125 degrees.
- The driver caches the values for a period varying between 1 second for the
- slowest chips and 125 ms for the fastest chips; reading it more often
- will do no harm, but will return 'old' values.
- The original LM75 was typically used in combination with LM78-like chips
- on PC motherboards, to measure the temperature of the processor(s). Clones
- are now used in various embedded designs.
- The LM75 is essentially an industry standard; there may be other
- LM75 clones not listed here, with or without various enhancements,
- that are supported. The clones are not detected by the driver, unless
- they reproduce the exact register tricks of the original LM75, and must
- therefore be instantiated explicitly. Higher resolution up to 12-bit
- is supported by this driver, other specific enhancements are not.
- The LM77 is not supported, contrary to what we pretended for a long time.
- Both chips are simply not compatible, value encoding differs.
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