mirror of
https://github.com/torvalds/linux.git
synced 2024-12-17 00:21:32 +00:00
37 lines
1.5 KiB
Plaintext
37 lines
1.5 KiB
Plaintext
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.
|