diff options
Diffstat (limited to 'Documentation/hwmon/lm75')
| -rw-r--r-- | Documentation/hwmon/lm75 | 73 |
1 files changed, 47 insertions, 26 deletions
diff --git a/Documentation/hwmon/lm75 b/Documentation/hwmon/lm75 index 8e6356fe05d..2560a9c6d44 100644 --- a/Documentation/hwmon/lm75 +++ b/Documentation/hwmon/lm75 @@ -7,26 +7,51 @@ Supported chips: 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' + * National Semiconductor LM75A + Prefix: 'lm75a' Addresses scanned: I2C 0x48 - 0x4f - Datasheet: Publicly available at the Dallas Semiconductor website - http://www.maxim-ic.com/ + 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 - Prefix: 'lm75' - Addresses scanned: I2C 0x48 - 0x4b + Prefixes: 'max6625', 'max6626' + Addresses scanned: none Datasheet: Publicly available at the Maxim website http://www.maxim-ic.com/ * Microchip (TelCom) TCN75 - Prefix: 'lm75' - Addresses scanned: I2C 0x48 - 0x4f + 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> @@ -42,24 +67,20 @@ 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 +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 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 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. +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. |