0001 Kernel driver lm95234
0002 =====================
0003
0004 Supported chips:
0005
0006 * National Semiconductor / Texas Instruments LM95233
0007
0008 Addresses scanned: I2C 0x18, 0x2a, 0x2b
0009
0010 Datasheet: Publicly available at the Texas Instruments website
0011
0012 https://www.ti.com/product/lm95233
0013
0014 * National Semiconductor / Texas Instruments LM95234
0015
0016 Addresses scanned: I2C 0x18, 0x4d, 0x4e
0017
0018 Datasheet: Publicly available at the Texas Instruments website
0019
0020 https://www.ti.com/product/lm95234
0021
0022 Author: Guenter Roeck <linux@roeck-us.net>
0023
0024 Description
0025 -----------
0026
0027 LM95233 and LM95234 are 11-bit digital temperature sensors with a 2-wire
0028 System Management Bus (SMBus) interface and TrueTherm technology
0029 that can very accurately monitor the temperature of two (LM95233)
0030 or four (LM95234) remote diodes as well as its own temperature.
0031 The remote diodes can be external devices such as microprocessors,
0032 graphics processors or diode-connected 2N3904s. The chip's TruTherm
0033 beta compensation technology allows sensing of 90 nm or 65 nm process
0034 thermal diodes accurately.
0035
0036 All temperature values are given in millidegrees Celsius. Temperature
0037 is provided within a range of -127 to +255 degrees (+127.875 degrees for
0038 the internal sensor). Resolution depends on temperature input and range.
0039
0040 Each sensor has its own maximum limit, but the hysteresis is common to all
0041 channels. The hysteresis is configurable with the tem1_max_hyst attribute and
0042 affects the hysteresis on all channels. The first two external sensors also
0043 have a critical limit.
0044
0045 The lm95234 driver can change its update interval to a fixed set of values.
0046 It will round up to the next selectable interval. See the datasheet for exact
0047 values. Reading sensor values more often will do no harm, but will return
0048 'old' values.
