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