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diff --git a/Documentation/hwmon/lm95234.rst b/Documentation/hwmon/lm95234.rst new file mode 100644 index 000000000000..e4c14bea5efd --- /dev/null +++ b/Documentation/hwmon/lm95234.rst @@ -0,0 +1,48 @@ +Kernel driver lm95234 +===================== + +Supported chips: + + * National Semiconductor / Texas Instruments LM95233 + + Addresses scanned: I2C 0x18, 0x2a, 0x2b + + Datasheet: Publicly available at the Texas Instruments website + + http://www.ti.com/product/lm95233 + + * National Semiconductor / Texas Instruments LM95234 + + Addresses scanned: I2C 0x18, 0x4d, 0x4e + + Datasheet: Publicly available at the Texas Instruments website + + http://www.ti.com/product/lm95234 + +Author: Guenter Roeck <linux@roeck-us.net> + +Description +----------- + +LM95233 and LM95234 are 11-bit digital temperature sensors with a 2-wire +System Management Bus (SMBus) interface and TrueTherm technology +that can very accurately monitor the temperature of two (LM95233) +or four (LM95234) remote diodes as well as its own temperature. +The remote diodes can be external devices such as microprocessors, +graphics processors or diode-connected 2N3904s. The chip's TruTherm +beta compensation technology allows sensing of 90 nm or 65 nm process +thermal diodes accurately. + +All temperature values are given in millidegrees Celsius. Temperature +is provided within a range of -127 to +255 degrees (+127.875 degrees for +the internal sensor). Resolution depends on temperature input and range. + +Each sensor has its own maximum limit, but the hysteresis is common to all +channels. The hysteresis is configurable with the tem1_max_hyst attribute and +affects the hysteresis on all channels. The first two external sensors also +have a critical limit. + +The lm95234 driver can change its update interval to a fixed set of values. +It will round up to the next selectable interval. See the datasheet for exact +values. Reading sensor values more often will do no harm, but will return +'old' values. |