1 Kernel driver jc42 2 ================== 3 4 Supported chips: 5 6 * Analog Devices ADT7408 7 8 Datasheets: 9 10 https://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf 11 12 * Atmel AT30TS00, AT30TS002A/B, AT30TSE004A 13 14 Datasheets: 15 16 http://www.atmel.com/Images/doc8585.pdf 17 18 http://www.atmel.com/Images/doc8711.pdf 19 20 http://www.atmel.com/Images/Atmel-8852-SEEPROM-AT30TSE002A-Datasheet.pdf 21 22 http://www.atmel.com/Images/Atmel-8868-DTS-AT30TSE004A-Datasheet.pdf 23 24 * IDT TSE2002B3, TSE2002GB2, TSE2004GB2, TS3000B3, TS3000GB0, TS3000GB2, 25 26 TS3001GB2 27 28 Datasheets: 29 30 Available from IDT web site 31 32 * Maxim MAX6604 33 34 Datasheets: 35 36 http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf 37 38 * Microchip MCP9804, MCP9805, MCP9808, MCP98242, MCP98243, MCP98244, MCP9843 39 40 Datasheets: 41 42 https://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf 43 44 https://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf 45 46 https://ww1.microchip.com/downloads/en/DeviceDoc/25095A.pdf 47 48 https://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf 49 50 https://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf 51 52 https://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf 53 54 * NXP Semiconductors SE97, SE97B, SE98, SE98A 55 56 Datasheets: 57 58 https://www.nxp.com/documents/data_sheet/SE97.pdf 59 60 https://www.nxp.com/documents/data_sheet/SE97B.pdf 61 62 https://www.nxp.com/documents/data_sheet/SE98.pdf 63 64 https://www.nxp.com/documents/data_sheet/SE98A.pdf 65 66 * ON Semiconductor CAT34TS02, CAT6095 67 68 Datasheet: 69 70 https://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF 71 72 https://www.onsemi.com/pub/Collateral/CAT6095-D.PDF 73 74 * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS2004, STTS3000 75 76 Datasheets: 77 78 http://www.st.com/web/en/resource/technical/document/datasheet/CD00157556.pdf 79 80 http://www.st.com/web/en/resource/technical/document/datasheet/CD00157558.pdf 81 82 http://www.st.com/web/en/resource/technical/document/datasheet/CD00266638.pdf 83 84 http://www.st.com/web/en/resource/technical/document/datasheet/CD00225278.pdf 85 86 http://www.st.com/web/en/resource/technical/document/datasheet/DM00076709.pdf 87 88 * JEDEC JC 42.4 compliant temperature sensor chips 89 90 Datasheet: 91 92 http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf 93 94 95 Common for all chips: 96 97 Prefix: 'jc42' 98 99 Addresses scanned: I2C 0x18 - 0x1f 100 101 Author: 102 Guenter Roeck <linux@roeck-us.net> 103 104 105 Description 106 ----------- 107 108 This driver implements support for JEDEC JC 42.4 compliant temperature sensors, 109 which are used on many DDR3 memory modules for mobile devices and servers. Some 110 systems use the sensor to prevent memory overheating by automatically throttling 111 the memory controller. 112 113 The driver auto-detects the chips listed above, but can be manually instantiated 114 to support other JC 42.4 compliant chips. 115 116 Example: the following will load the driver for a generic JC 42.4 compliant 117 temperature sensor at address 0x18 on I2C bus #1:: 118 119 # modprobe jc42 120 # echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device 121 122 A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum, 123 and critical temperature can be configured. There are alarms for high, low, 124 and critical thresholds. 125 126 There is also an hysteresis to control the thresholds for resetting alarms. 127 Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5, 128 3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those 129 limits. The chip supports only a single register to configure the hysteresis, 130 which applies to all limits. This register can be written by writing into 131 temp1_crit_hyst. Other hysteresis attributes are read-only. 132 133 If the BIOS has configured the sensor for automatic temperature management, it 134 is likely that it has locked the registers, i.e., that the temperature limits 135 cannot be changed. 136 137 Sysfs entries 138 ------------- 139 140 ======================= =========================================== 141 temp1_input Temperature (RO) 142 temp1_min Minimum temperature (RO or RW) 143 temp1_max Maximum temperature (RO or RW) 144 temp1_crit Critical high temperature (RO or RW) 145 146 temp1_crit_hyst Critical hysteresis temperature (RO or RW) 147 temp1_max_hyst Maximum hysteresis temperature (RO) 148 149 temp1_min_alarm Temperature low alarm 150 temp1_max_alarm Temperature high alarm 151 temp1_crit_alarm Temperature critical alarm 152 ======================= ===========================================
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