| 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, TMP75, TMP175, TMP275 |
| Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp175', 'tmp75', '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/tmp75 |
| http://www.ti.com/product/tmp175 |
| http://www.ti.com/product/tmp275 |
| |
| 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. |
