lm95245.rst (1726B)
1Kernel driver lm95245 2===================== 3 4Supported chips: 5 6 * TI LM95235 7 8 Addresses scanned: I2C 0x18, 0x29, 0x4c 9 10 Datasheet: Publicly available at the TI website 11 12 https://www.ti.com/lit/ds/symlink/lm95235.pdf 13 14 * TI / National Semiconductor LM95245 15 16 Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d 17 18 Datasheet: Publicly available at the TI website 19 20 https://www.ti.com/lit/ds/symlink/lm95245.pdf 21 22Author: Alexander Stein <alexander.stein@systec-electronic.com> 23 24Description 25----------- 26 27LM95235 and LM95245 are 11-bit digital temperature sensors with a 2-wire System 28Management Bus (SMBus) interface and TruTherm technology that can monitor 29the temperature of a remote diode as well as its own temperature. 30The chips can be used to very accurately monitor the temperature of 31external devices such as microprocessors. 32 33All temperature values are given in millidegrees Celsius. Local temperature 34is given within a range of -127 to +127.875 degrees. Remote temperatures are 35given within a range of -127 to +255 degrees. Resolution depends on 36temperature input and range. 37 38Each sensor has its own critical limit. Additionally, there is a relative 39hysteresis value common to both critical limits. To make life easier to 40user-space applications, two absolute values are exported, one for each 41channel, but these values are of course linked. Only the local hysteresis 42can be set from user-space, and the same delta applies to the remote 43hysteresis. 44 45The lm95245 driver can change its update interval to a fixed set of values. 46It will round up to the next selectable interval. See the datasheet for exact 47values. Reading sensor values more often will do no harm, but will return 48'old' values.