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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 DS75
- Prefix: 'lm75'
- Addresses scanned: I2C 0x48 - 0x4f
- Datasheet: Publicly available at the Dallas Semiconductor website
- http://www.maxim-ic.com/
- * Dallas Semiconductor DS1775
- Prefix: 'lm75'
- Addresses scanned: I2C 0x48 - 0x4f
- Datasheet: Publicly available at the Dallas Semiconductor website
- http://www.maxim-ic.com/
- * Maxim MAX6625, MAX6626
- Prefix: 'lm75'
- Addresses scanned: I2C 0x48 - 0x4b
- Datasheet: Publicly available at the Maxim website
- http://www.maxim-ic.com/
- * Microchip (TelCom) TCN75
- Prefix: 'lm75'
- Addresses scanned: I2C 0x48 - 0x4f
- Datasheet: Publicly available at the Microchip website
- http://www.microchip.com/
- 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 LM75 only updates its values each 1.5 seconds; reading it more often
- will do no harm, but will return 'old' values.
- The LM75 is usually used in combination with LM78-like chips, to measure
- the temperature of the processor(s).
- The DS75, DS1775, MAX6625, and MAX6626 are supported as well.
- They are not distinguished from an LM75. While most of these chips
- have three additional bits of accuracy (12 vs. 9 for the LM75),
- the additional bits are not supported. Not only that, but these chips will
- not be detected if not in 9-bit precision mode (use the force parameter if
- needed).
- The TCN75 is supported as well, and is not distinguished from an LM75.
- 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 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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