You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
41 lines
1.7 KiB
41 lines
1.7 KiB
Kernel driver lm95234
|
|
=====================
|
|
|
|
Supported chips:
|
|
* National Semiconductor / Texas Instruments LM95233
|
|
Addresses scanned: I2C 0x18, 0x2a, 0x2b
|
|
Datasheet: Publicly available at the Texas Instruments website
|
|
http://www.ti.com/product/lm95233
|
|
* 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
|
|
-----------
|
|
|
|
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.
|
|
|