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Based on kernel version 3.16. Page generated on 2014-08-06 21:39 EST.

1	Kernel driver jc42
2	==================
3	
4	Supported chips:
5	  * Analog Devices ADT7408
6	    Datasheets:
7		http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf
8	  * Atmel AT30TS00, AT30TS002A/B, AT30TSE004A
9	    Datasheets:
10		http://www.atmel.com/Images/doc8585.pdf
11		http://www.atmel.com/Images/doc8711.pdf
12		http://www.atmel.com/Images/Atmel-8852-SEEPROM-AT30TSE002A-Datasheet.pdf
13		http://www.atmel.com/Images/Atmel-8868-DTS-AT30TSE004A-Datasheet.pdf
14	  * IDT TSE2002B3, TSE2002GB2, TS3000B3, TS3000GB2
15	    Datasheets:
16		http://www.idt.com/sites/default/files/documents/IDT_TSE2002B3C_DST_20100512_120303152056.pdf
17		http://www.idt.com/sites/default/files/documents/IDT_TSE2002GB2A1_DST_20111107_120303145914.pdf
18		http://www.idt.com/sites/default/files/documents/IDT_TS3000B3A_DST_20101129_120303152013.pdf
19		http://www.idt.com/sites/default/files/documents/IDT_TS3000GB2A1_DST_20111104_120303151012.pdf
20	  * Maxim MAX6604
21	    Datasheets:
22		http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf
23	  * Microchip MCP9804, MCP9805, MCP98242, MCP98243, MCP98244, MCP9843
24	    Datasheets:
25		http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf
26		http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf
27		http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf
28		http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf
29		http://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf
30	  * NXP Semiconductors SE97, SE97B, SE98, SE98A
31	    Datasheets:
32		http://www.nxp.com/documents/data_sheet/SE97.pdf
33		http://www.nxp.com/documents/data_sheet/SE97B.pdf
34		http://www.nxp.com/documents/data_sheet/SE98.pdf
35		http://www.nxp.com/documents/data_sheet/SE98A.pdf
36	  * ON Semiconductor CAT34TS02, CAT6095
37	    Datasheet:
38		http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF
39		http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF
40	  * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS2004, STTS3000
41	    Datasheets:
42		http://www.st.com/web/en/resource/technical/document/datasheet/CD00157556.pdf
43		http://www.st.com/web/en/resource/technical/document/datasheet/CD00157558.pdf
44		http://www.st.com/web/en/resource/technical/document/datasheet/CD00266638.pdf
45		http://www.st.com/web/en/resource/technical/document/datasheet/CD00225278.pdf
46		http://www.st.com/web/en/resource/technical/document/datasheet/DM00076709.pdf
47	  * JEDEC JC 42.4 compliant temperature sensor chips
48	    Datasheet:
49		http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf
50	
51	  Common for all chips:
52	    Prefix: 'jc42'
53	    Addresses scanned: I2C 0x18 - 0x1f
54	
55	Author:
56		Guenter Roeck <linux@roeck-us.net>
57	
58	
59	Description
60	-----------
61	
62	This driver implements support for JEDEC JC 42.4 compliant temperature sensors,
63	which are used on many DDR3 memory modules for mobile devices and servers. Some
64	systems use the sensor to prevent memory overheating by automatically throttling
65	the memory controller.
66	
67	The driver auto-detects the chips listed above, but can be manually instantiated
68	to support other JC 42.4 compliant chips.
69	
70	Example: the following will load the driver for a generic JC 42.4 compliant
71	temperature sensor at address 0x18 on I2C bus #1:
72	
73	# modprobe jc42
74	# echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
75	
76	A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum,
77	and critical temperature can be configured. There are alarms for high, low,
78	and critical thresholds.
79	
80	There is also an hysteresis to control the thresholds for resetting alarms.
81	Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5,
82	3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those
83	limits. The chip supports only a single register to configure the hysteresis,
84	which applies to all limits. This register can be written by writing into
85	temp1_crit_hyst. Other hysteresis attributes are read-only.
86	
87	If the BIOS has configured the sensor for automatic temperature management, it
88	is likely that it has locked the registers, i.e., that the temperature limits
89	cannot be changed.
90	
91	Sysfs entries
92	-------------
93	
94	temp1_input		Temperature (RO)
95	temp1_min		Minimum temperature (RO or RW)
96	temp1_max		Maximum temperature (RO or RW)
97	temp1_crit		Critical high temperature (RO or RW)
98	
99	temp1_crit_hyst		Critical hysteresis temperature (RO or RW)
100	temp1_max_hyst		Maximum hysteresis temperature (RO)
101	
102	temp1_min_alarm		Temperature low alarm
103	temp1_max_alarm		Temperature high alarm
104	temp1_crit_alarm	Temperature critical alarm
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