forked from Minki/linux
162a8dfe73
LM95235 is register compatible to LM95245. Also update link to LM95245 data sheet, and drop the link to the datasheet from the driver source to simplify code maintenance. Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
42 lines
1.7 KiB
Plaintext
42 lines
1.7 KiB
Plaintext
Kernel driver lm95245
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==================
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Supported chips:
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* TI LM95235
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Addresses scanned: I2C 0x18, 0x29, 0x4c
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Datasheet: Publicly available at the TI website
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http://www.ti.com/lit/ds/symlink/lm95235.pdf
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* TI / National Semiconductor LM95245
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Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d
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Datasheet: Publicly available at the TI website
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http://www.ti.com/lit/ds/symlink/lm95245.pdf
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Author: Alexander Stein <alexander.stein@systec-electronic.com>
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Description
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-----------
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LM95235 and LM95245 are 11-bit digital temperature sensors with a 2-wire System
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Management Bus (SMBus) interface and TruTherm technology that can monitor
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the temperature of a remote diode as well as its own temperature.
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The chips can be used to very accurately monitor the temperature of
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external devices such as microprocessors.
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All temperature values are given in millidegrees Celsius. Local temperature
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is given within a range of -127 to +127.875 degrees. Remote temperatures are
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given within a range of -127 to +255 degrees. Resolution depends on
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temperature input and range.
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Each sensor has its own critical limit. Additionally, there is a relative
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hysteresis value common to both critical limits. To make life easier to
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user-space applications, two absolute values are exported, one for each
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channel, but these values are of course linked. Only the local hysteresis
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can be set from user-space, and the same delta applies to the remote
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hysteresis.
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The lm95245 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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