Blame - Documentation/hwmon/lm75 - kernel/msm-4.9

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R.Marek@sh.cvut.cz	7f15b66	2005-05-26 12:42:19 +0000	[diff] [blame]	1	Kernel driver lm75
				2	==================
				3
				4	Supported chips:
				5	* National Semiconductor LM75
				6	Prefix: 'lm75'
				7	Addresses scanned: I2C 0x48 - 0x4f
				8	Datasheet: Publicly available at the National Semiconductor website
				9	http://www.national.com/
Len Sorensen	05e82fe	2011-03-21 17:59:36 +0100	[diff] [blame]	10	* National Semiconductor LM75A
				11	Prefix: 'lm75a'
				12	Addresses scanned: I2C 0x48 - 0x4f
				13	Datasheet: Publicly available at the National Semiconductor website
				14	http://www.national.com/
Jean Delvare	3fbc81e	2013-05-04 14:49:36 +0200	[diff] [blame]	15	* Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
				16	Prefixes: 'ds75', 'ds1775', 'ds7505'
Jean Delvare	426343e	2011-10-13 17:15:11 -0400	[diff] [blame]	17	Addresses scanned: none
Jean Delvare	3fbc81e	2013-05-04 14:49:36 +0200	[diff] [blame]	18	Datasheet: Publicly available at the Maxim website
				19	http://www.maximintegrated.com/
R.Marek@sh.cvut.cz	7f15b66	2005-05-26 12:42:19 +0000	[diff] [blame]	20	* Maxim MAX6625, MAX6626
Jean Delvare	426343e	2011-10-13 17:15:11 -0400	[diff] [blame]	21	Prefixes: 'max6625', 'max6626'
				22	Addresses scanned: none
R.Marek@sh.cvut.cz	7f15b66	2005-05-26 12:42:19 +0000	[diff] [blame]	23	Datasheet: Publicly available at the Maxim website
				24	http://www.maxim-ic.com/
				25	* Microchip (TelCom) TCN75
Jean Delvare	25eba81	2013-03-18 21:19:49 +0100	[diff] [blame]	26	Prefix: 'tcn75'
Jean Delvare	426343e	2011-10-13 17:15:11 -0400	[diff] [blame]	27	Addresses scanned: none
				28	Datasheet: Publicly available at the Microchip website
				29	http://www.microchip.com/
				30	* Microchip MCP9800, MCP9801, MCP9802, MCP9803
				31	Prefix: 'mcp980x'
				32	Addresses scanned: none
R.Marek@sh.cvut.cz	7f15b66	2005-05-26 12:42:19 +0000	[diff] [blame]	33	Datasheet: Publicly available at the Microchip website
				34	http://www.microchip.com/
Michael Hennerich	e96f9d8	2011-10-13 04:43:31 -0400	[diff] [blame]	35	* Analog Devices ADT75
				36	Prefix: 'adt75'
Jean Delvare	426343e	2011-10-13 17:15:11 -0400	[diff] [blame]	37	Addresses scanned: none
Michael Hennerich	e96f9d8	2011-10-13 04:43:31 -0400	[diff] [blame]	38	Datasheet: Publicly available at the Analog Devices website
				39	http://www.analog.com/adt75
Jean Delvare	426343e	2011-10-13 17:15:11 -0400	[diff] [blame]	40	* ST Microelectronics STDS75
				41	Prefix: 'stds75'
				42	Addresses scanned: none
				43	Datasheet: Publicly available at the ST website
				44	http://www.st.com/internet/analog/product/121769.jsp
				45	* Texas Instruments TMP100, TMP101, TMP105, TMP75, TMP175, TMP275
				46	Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp175', 'tmp75', 'tmp275'
				47	Addresses scanned: none
				48	Datasheet: Publicly available at the Texas Instruments website
				49	http://www.ti.com/product/tmp100
				50	http://www.ti.com/product/tmp101
				51	http://www.ti.com/product/tmp105
				52	http://www.ti.com/product/tmp75
				53	http://www.ti.com/product/tmp175
				54	http://www.ti.com/product/tmp275
R.Marek@sh.cvut.cz	7f15b66	2005-05-26 12:42:19 +0000	[diff] [blame]	55
				56	Author: Frodo Looijaard <frodol@dds.nl>
				57
				58	Description
				59	-----------
				60
				61	The LM75 implements one temperature sensor. Limits can be set through the
				62	Overtemperature Shutdown register and Hysteresis register. Each value can be
				63	set and read to half-degree accuracy.
				64	An alarm is issued (usually to a connected LM78) when the temperature
				65	gets higher then the Overtemperature Shutdown value; it stays on until
				66	the temperature falls below the Hysteresis value.
				67	All temperatures are in degrees Celsius, and are guaranteed within a
				68	range of -55 to +125 degrees.
				69
Jean Delvare	0cd2c72	2013-05-04 14:49:36 +0200	[diff] [blame]	70	The driver caches the values for a period varying between 1 second for the
				71	slowest chips and 125 ms for the fastest chips; reading it more often
R.Marek@sh.cvut.cz	7f15b66	2005-05-26 12:42:19 +0000	[diff] [blame]	72	will do no harm, but will return 'old' values.
				73
Jean Delvare	426343e	2011-10-13 17:15:11 -0400	[diff] [blame]	74	The original LM75 was typically used in combination with LM78-like chips
				75	on PC motherboards, to measure the temperature of the processor(s). Clones
				76	are now used in various embedded designs.
R.Marek@sh.cvut.cz	7f15b66	2005-05-26 12:42:19 +0000	[diff] [blame]	77
				78	The LM75 is essentially an industry standard; there may be other
				79	LM75 clones not listed here, with or without various enhancements,
Jean Delvare	426343e	2011-10-13 17:15:11 -0400	[diff] [blame]	80	that are supported. The clones are not detected by the driver, unless
				81	they reproduce the exact register tricks of the original LM75, and must
Jean Delvare	0cd2c72	2013-05-04 14:49:36 +0200	[diff] [blame]	82	therefore be instantiated explicitly. Higher resolution up to 12-bit
				83	is supported by this driver, other specific enhancements are not.
R.Marek@sh.cvut.cz	7f15b66	2005-05-26 12:42:19 +0000	[diff] [blame]	84
				85	The LM77 is not supported, contrary to what we pretended for a long time.
				86	Both chips are simply not compatible, value encoding differs.