1 Kernel driver lm95234 2 ===================== 3 4 Supported chips: 5 6 * National Semiconductor / Texas Instruments LM95233 7 8 Addresses scanned: I2C 0x18, 0x2a, 0x2b 9 10 Datasheet: Publicly available at the Texas Instruments website 11 12 https://www.ti.com/product/lm95233 13 14 * National Semiconductor / Texas Instruments LM95234 15 16 Addresses scanned: I2C 0x18, 0x4d, 0x4e 17 18 Datasheet: Publicly available at the Texas Instruments website 19 20 https://www.ti.com/product/lm95234 21 22 Author: Guenter Roeck <linux@roeck-us.net> 23 24 Description 25 ----------- 26 27 LM95233 and LM95234 are 11-bit digital temperature sensors with a 2-wire 28 System Management Bus (SMBus) interface and TrueTherm technology 29 that can very accurately monitor the temperature of two (LM95233) 30 or four (LM95234) remote diodes as well as its own temperature. 31 The remote diodes can be external devices such as microprocessors, 32 graphics processors or diode-connected 2N3904s. The chip's TruTherm 33 beta compensation technology allows sensing of 90 nm or 65 nm process 34 thermal diodes accurately. 35 36 All temperature values are given in millidegrees Celsius. Temperature 37 is provided within a range of -127 to +255 degrees (+127.875 degrees for 38 the internal sensor). Resolution depends on temperature input and range. 39 40 Each sensor has its own maximum limit, but the hysteresis is common to all 41 channels. The hysteresis is configurable with the tem1_max_hyst attribute and 42 affects the hysteresis on all channels. The first two external sensors also 43 have a critical limit. 44 45 The lm95234 driver can change its update interval to a fixed set of values. 46 It will round up to the next selectable interval. See the datasheet for exact 47 values. Reading sensor values more often will do no harm, but will return 48 'old' values.
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