path: root/Documentation/hwmon/lm95234
diff options
authorGuenter Roeck <linux@roeck-us.net>2013-03-10 16:54:19 -0700
committerGuenter Roeck <linux@roeck-us.net>2013-04-07 21:16:42 -0700
commite1eb49063b301fd885fca63e2f24d1dac1d65d0e (patch)
treee6034cb4c87e86612199cf1ad5fe280d4d2e6e9a /Documentation/hwmon/lm95234
parenthwmon: (tmp401) Add support for TMP431 (diff)
hwmon: Add driver for LM95234
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon/lm95234')
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>
+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.