summaryrefslogtreecommitdiffstats
path: root/Documentation/hwmon/lm95234.rst
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/hwmon/lm95234.rst')
-rw-r--r--Documentation/hwmon/lm95234.rst48
1 files changed, 48 insertions, 0 deletions
diff --git a/Documentation/hwmon/lm95234.rst b/Documentation/hwmon/lm95234.rst
new file mode 100644
index 0000000000..a44e8f5298
--- /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
+
+ https://www.ti.com/product/lm95233
+
+ * National Semiconductor / Texas Instruments LM95234
+
+ Addresses scanned: I2C 0x18, 0x4d, 0x4e
+
+ Datasheet: Publicly available at the Texas Instruments website
+
+ https://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.