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author | David S. Miller <davem@davemloft.net> | 2013-05-04 18:34:13 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2013-05-04 18:34:13 -0700 |
commit | 048c9acca90ca7da42b92745445fe008a48add88 (patch) | |
tree | e2e551a565a7dcdca0fc398aa659231745e5a901 /Documentation/hwmon/lm95234 | |
parent | 07df841877195765d958df146f614fc7bdedd5e3 (diff) | |
parent | ad348cc5349be4ef4abe08819afbb63386585413 (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Merge sparc bug fixes that didn't make it into v3.9 into
sparc-next.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/hwmon/lm95234')
-rw-r--r-- | Documentation/hwmon/lm95234 | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/hwmon/lm95234 b/Documentation/hwmon/lm95234 new file mode 100644 index 000000000000..a0e95ddfd372 --- /dev/null +++ b/Documentation/hwmon/lm95234 @@ -0,0 +1,36 @@ +Kernel driver lm95234 +===================== + +Supported chips: + * 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 +----------- + +LM95234 is an 11-bit digital temperature sensor with a 2-wire System Management +Bus (SMBus) interface and TrueTherm technology that can very accurately monitor +the temperature of four remote diodes as well as its own temperature. +The four remote diodes can be external devices such as microprocessors, +graphics processors or diode-connected 2N3904s. The LM95234'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. |